Synco™ 700 Modular boiler sequence controller RMK770 including extension modules RMZ785, RMZ787, RMZ788 and RMZ789 Basic Documentation Edition 2.1 Controller series B CE1P3132en 23.04.
Siemens Switzerland Ltd Industry Sector Building Technologies Division International Headquarters HVAC Products Gubelstrasse 22 CH -6301 Zug Tel. +41 41 724 24 24 Fax +41 41 724 35 22 www.sbt.siemens.com © 2004-2009 Siemens Switzerland Ltd Subject to alteration 2/232 Building Technologies HVAC Products Boiler Sequence Controller RMK770 CE1P3132en 23.04.
Contents 1 Summary ....................................................................................................... 11 1.1 Product range ................................................................................................ 11 1.2 System topology ............................................................................................ 12 1.3 Equipment combinations ............................................................................... 12 1.4 Product documentation........
3.10 Leaving the password level............................................................................47 3.11 Marking changes............................................................................................47 3.12 Plant types and default terminal assignments ...............................................48 4 General settings.............................................................................................52 4.1 Time of day and date .......................................
.8.2 Pump supervision and twin pumps................................................................ 70 5.8.3 Changeover logic........................................................................................... 71 5.8.4 Overload message and supervision of flow................................................... 72 6 Boiler sequence management....................................................................... 73 6.1 Overview of function block...............................................
7.9.1 Maximum limitation of the boiler temperature ..............................................117 7.9.2 Minimum limitation of the boiler temperature ...............................................117 7.9.3 Protective boiler startup ...............................................................................117 7.9.4 Optimization of the minimum boiler temperature .........................................118 7.9.5 Boiler shutdown .................................................................
9.8.4 Pulse limitation ............................................................................................ 146 9.8.5 Pump overrun and mixing valve overrun ..................................................... 147 9.8.6 Pump kick and valve kick ............................................................................ 147 9.9 Text designation .......................................................................................... 147 9.10 Fault handling .................................
10.8.6 Pump kick and valve kick.............................................................................176 10.9 Heat demand ...............................................................................................176 10.10 Extra functions .............................................................................................177 10.10.1 Text designations.........................................................................................177 10.10.
13.5.3 Plant behavior.............................................................................................. 197 13.6 State diagrams of the individual types of fault ............................................. 198 13.7 Predefined fault inputs................................................................................. 199 13.8 Fault inputs .................................................................................................. 199 13.8.1 Universal fault inputs ...............
16.2.6 Meters ..........................................................................................................223 16.2.7 Devices ........................................................................................................223 16.2.8 Menu tree.....................................................................................................223 16.3 Info pages ....................................................................................................
1 Summary 1.1 Product range Type of unit Controller Description Boiler sequence controller Product no.
System topology QAW740 RXB… 3132Z02 1.2 KNX TP1 RMZ790 RMZ791 RMK770 RMU7… RM… OCI700.1 1.3 Equipment combinations Description Technical data / product no. Data Sheet no.
1.4 Product documentation In addition to this Basic Documentation, the product documents listed below provide detailed information on the safe and correct deployment and operation of Synco™ 700 products in building services plant. Type of document Classification no.
1.5 Important notes This symbol shall draw your attention to special safety notes and warnings. If such notes are not observed, personal injury and/or considerable damage to property can occur. Field of use Synco™ 700 products may only be used for the control and supervision of heating, ventilation, air conditioning and chilled water plant. Correct use Prerequisites for flawless and safe operation of Synco™ products are proper transport, installation and commissioning, as well as correct operation.
2 Operation Synco™ 700 devices may only be operated by staff who have been instructed by Siemens Building Technologies or their delegates and whose attention has been drawn to potential risks. 2.
2.2 Operation with operator unit 2.2.1 Functions of the operator unit The operator unit is used to make all settings and readouts required for operating the controller. All entries made on the operator unit are transmitted to the controller where they are handled and stored; the operator unit itself does not store any data. Information for the user is generated by the controller and forwarded to the operator unit where it is displayed. 2.2.
Display examples Start display: Wednesday 02.12.05 Welcome « Information 14:52 Main menu » Setting level. Selection of a setting parameter, e.g. from the Main menu of the user level: Main menu Boiler sequence manager… Boiler 1… Boiler 2… Heating circuit Setting level, pop-up, setting a numerical value: Entry 1 Start: ––.––.–– 25.02 End: ––.––.–– Reason: Cancel entry ––.–– ––.–– Holidays Setting level, Help picture ”Explanations relating to the selected datapoint”.
Switching between the operating levels • Switching from the Info level to the setting level: 1. Select the start page by pressing the ESC button. 2. Press the OK knob to change to the setting level. • Switching from the setting level to the Info level: 1. Select the start page with the ESC button. Press the button repeatedly until the start page reappears. 2. Press the INFO button to change to the Info level. 2.2.4 Access rights An access right is defined for each parameter (operating line).
3 Commissioning Preparation for use and commissioning of Synco™ 700 controllers must be undertaken by qualified staff who have been appropriately trained by Siemens Building Technologies. 3.1 Basic concept Using the RMK770 controller, boiler sequencing can include up to 6 boilers. When selecting a plant type, boiler sequencing with 2 boilers is predefined. Boiler hydraulics and the type of burner selected with the plant type in the basic configuration always apply to both boilers.
M M X1 M G1 X2 X3 M M G1 X4 M M X5 G1 X6 D2 M X8 X7 M G1 M D1 G1 Y2 Y1 G0 3132S42 CE- CE+ G0 G G0 RMK770 Q14 Q12 Q24 Q11 Q34 Q23 Q42 Q44 Q54 Q41 Q33 Q53 T Q64 Q63 Q74 Q73 T T T To integrate the third boiler, 2 choices are available: Since the RMK770 controller does not have a sufficient number of outputs, an extension module is required.
Variant with a second RMK770 Depending on the type of plant, it may be practical to use a second RMK770 controller with the third boiler. On that second RMK770, select basic type K and – in the extra configuration – assign boiler 3 the plant components boiler temperature sensor, burner stage 1, boiler pump and shutoff valve.
3.2 Entering the commissioning mode During commissioning, the plant’s control and safety functions remain deactivated. The relays maintain their normal position, which means that their normally open contacts are open. When supplying power to the controller for the first time, the Language menu appears. Here, the language for commissioning and plant operation can be selected. After the language has been selected and confirmed with the OK knob, the time of day, date and year can be set in the same way.
Plant type Types of hydraulic circuit The plant type is made up of a 2-digit number, e.g. K2.3: • The first digit defines the type of hydraulic circuit of the boiler sequence • The second digit defines the type of burner or the type of burner control: − Kx.1: 1-stage burner − Kx.2: 2-stage burner − Kx.3: Modulating burner with 3-position control • For DC 0…10 V control of a modulating burner, the 1-stage burner is used as the basic stage.
3132S10 K4.x 3132S13 K5.x M M 3132S16 K6.x 24/232 Building Technologies HVAC Products Boiler Sequence Controller RMK770 3 Commissioning CE1P3132en 23.04.
Plant types and module assignment Plant type Controller RMK770 Extension modules RMZ789 RMZ787 RMZ789(2) With main pump, no shutoff valve, no boiler pump K1.1 1-stage burner 9 K1.2 2-stage burner 9 K1.3 Modulating burner, 3-position 9 K2.1 1-stage burner 9 K2.2 2-stage burner 9 K2.3 Modulating burner, 3-position 9 9 With main pump, with shutoff valve, no boiler pump 9 With main pump, with shutoff valve, with boiler pump in the bypass K3.1 1-stage burner 9 K3.
3132S46 Bo2.TBo Bo1.TBo T T MnPu Bo1.BuSt1 Bo1.BuSt2 Bo1.BoPu_A Bo2.BuSt1 Bo2.BuSt2 TMnFl Bo2.BoPu_A T Bo2.VlvShOff Bo2.VlvShOff TMnRt T TMnFl TMnRt Bo1.TBo Bo1.TRtBo Bo2.TBo Bo2.TRtBo Main flow temperature sensor Main return temperature sensor Boiler 1, boiler temperature sensor Boiler 1, boiler return temperature sensor Boiler 2, boiler temperature sensor Boiler 2, boiler return temperature sensor Bo1.BoPu Bo1.BuSt1 Bo1.BuSt2 Bo1.BuMdltUp Bo1.BuMdltDn Bo1.VlvRTMxUp Bo1.VlvRTMxDn Bo1.
3132S47 Plant types K1.x and K2.x K1.x T K1.1, K1.2, K2.1, K2.2 CE - CE + M X1 M M G 1 X2 X3 M M G 1 X4 X5 T M M M X6 G 1 M D2 X8 X7 D1 M G 1 Y2 G 0 G 0 Y1 G 1 G 0 G RMK770 Q 24 Q 14 Q 12 Q 11 Q 34 Q 23 Q 44 Q 42 Q 33 Q 54 Q 41 Q 64 Q 53 Q 74 Q 73 Q 63 RMK770 K1.3, K2.
3132S48 Plant types K3.x and K4.x K3.x T K3.1, K4.1, K4.2: CE - M CE + T X1 M X2 M G 1 X3 M M X4 G 1 X5 M M X6 G 1 X7 M M D2 X8 D1 M G 1 G 1 Y2 G 0 G 0 Y1 G 0 G RMK770 Q 14 Q 12 Q 24 Q 11 Q 34 Q 23 Q 44 Q 42 Q 33 Q 54 Q 41 Q 64 Q 53 Q 74 Q 73 Q 63 RMK770 T K3.2: M CE - T CE + X1 M X2 M G 1 X3 M M X4 G 1 X5 M M M X6 G 1 M D2 D1 X8 X7 M G 1 G 1 Y2 Y1 G 0 M G 0 G G 0 B1 M M X2 X3 Q 12 K4.
K5.x T K5.1: 3132S49 Plant type K5.x T CE - M CE + M X1 X2 M G 1 M M X3 X4 G 1 M X5 M X6 G 1 X7 M M D2 X8 D1 G 1 M G 1 Y2 Y1 G 0 G 0 G 0 G RMK770 Q 14 Q 12 Q 24 Q 11 Q 34 Q 23 Q 42 Q 33 Q 44 Q 54 Q 41 Q 64 Q 53 Q 74 Q 73 Q 63 RMK770 K5.
3132S50 Plant type K6.x K6.x T T K6.1, K6.2: M CE - CE + X1 M X2 M M M X3 G 1 X4 G 1 X5 M M X6 G 1 X7 M D2 M D1 X8 G 1 M G 1 Y2 Y1 G 0 M G 0 G G 0 B1 Q 12 M X3 Q 14 Q 24 Q 11 Q 42 Q 34 Q 33 Q 23 Q 44 Q 64 Q 54 Q 41 Q 53 G 1 Y9 G 0 RMZ789 Q 63 Y2 4 Y1 4 Q 74 Q 73 Y1 3 RMK770 T M X2 RMK770 N1 Y2 3 Q 14 Q 13 RMZ789 K6.
3.3.2 Terminal assignment and properties of outputs In principle, all input and output terminals can be freely used. The terminals preassigned when selecting the plant type can also be reconfigured. In that case, however, the special properties of the individual extension modules, and their outputs, must be taken into consideration. When controlling a shutoff valve, an on/off signal is usually required. For that purpose, a number of relays with changeover contacts are available.
3.3.3 Short designations for basic module and extension modules The following short designations are used for the basic module and the extension modules: Short designation N A5 A7 A8 A9 A9(1) A9(2) Type of module Basic module RMK770 Extension module RMZ785 Extension module RMZ787 Extension module RMZ788 Extension module RMZ789 First extension module RMZ789 Second extension module RMZ789 These short designations also appear o§ the display of the operator unit. 3.3.
Function blocks The configuration diagram shows all function blocks active in the plant type. In this example, they are the following function blocks: • Boiler sequence manager • Boiler 1 • Boiler 2 Inputs and outputs The configuration diagram shows the inputs and outputs that are preconfigured. If required, additional inputs and outputs (e.g. flue gas temperature sensor, burner operation checkback signal) can be assigned to the free inputs and outputs in the extra configuration.
It is possible to reconfigure or remove preconfigured inputs and outputs. If, for example, the second burner stage is removed from boiler 1 (--- in place of N.Q3), the burner of boiler 1 becomes a 1-stage burner. Further function blocks can be activated via the extra configuration. Shutoff valve DC0...10 V Auto close Heating curve DHW Frost protection Summer operation Main flow Function blocks close Fault button Display 4 Display 2 close Shutoff valve Setpoint comp. DC 0...
Number of extension modules A maximum of 3 extension modules can be fitted. The number of extension modules of the same type is not limited. Assignment of functions The assignment of functions to the basic module and the extension modules is not prescribed. With the plant types, the temperature sensors are always preconfigured to the basic module as standard. Relay outputs for 3-position applications are preconfigured to extension modules with the possibility of using RC units (RMZ789).
Fault handling Fault status messages If the extension modules actually used and their positions do not agree with the values on the controller list, a fault status message ”Fault extension module” is delivered. In the case of an incorrectly configured extension module, some other fault status message may also be displayed because that consequential fault has the higher priority than fault status message 7101. It is therefore of advantage to have all present faults displayed.
Hydraulics-dependent inputs and outputs of function block “Boiler sequence manager” 3132S52 3.4.1 Boiler sequence management MnPu_A TFg TFg T TFlPrCtr PrCtrVlvMx TPu_A TBo T BoPu_A VlvRtMx TBo T T MnPu_B BuMnSt BuMdltUp BuMdltDn BuSt1 BuSt2 TRtBo T T BoPu_B TRtBo T T TPu_B TRtPrCtr TMnFl T T BoPu VlvShOff TRtMx TRtMn T T TRtCo T MnVlvRtMx The sensors and actuating devices in the highlighted part belong to function block “Boiler sequence manager”.
Consumer return sensor (TRtCo) The return sensor on the consumer side can be used for frost protection for the plant. Main pump A (MnPu_A) Common main pump A (the menu item does not show designation ”A“). Main pump B (MnPu_B) Common main pump B if the common main pump is a twin pump. Maintained boiler return temperature (MnVlvRtMx) Common 3-position or modulating mixing valve for minimum limitation of the boiler temperature (for restriction regarding the 3-position output, refer to subsection 3.3.
Boiler sensor (TBo) The boiler temperature sensor is used as a control sensor for the boiler temperature setpoint. It is mandatory for minimum and maximum limitation of the boiler temperature and for modulating burners. Return sensor (TRtBo) The boiler return temperature sensor is used as a control sensor for maintained boiler return temperature with mixing valve. Flue gas temperature sensor(TFg) The flue gas temperature sensor is used for supervision of the flue gas temperature.
Main menu > Commissioning > Extra configuration > Primary controller > Outputs Operating line Mixing valve 3-pos Mixing valve modulating System pump System pump B Range Name PrCtrVlvMx PrCtrVlvMx TPu_A TPu_B RMK770…, RMZ7…* * Here, the free outputs are available for selection Flow sensor (TFlPrCtr) Flow temperature sensor in the primary controller loop. Return sensor (TRtPrCtr) Return temperature sensor in the primary controller loop.
Main menu > Commissioning > Extra configuration > Heating circuit > Outputs Operating line Mixing valve 3-pos Mixing valve modulating Heating circuit pump Heating circuit pump B Range RMK770…, RMZ7…* Name HCtrVlvMx HCtrVlvMx HCtrPu HCtrPu_B * Here, the free outputs are available for selection Virtual heating circuit Function block “Heating circuit” can be used as a “virtual heating circuit“.
Outside sensor Here, an outside sensor can be configured. That sensor can be used for both the heating circuit and the boiler sequence manager. Special day input Digital input for activating the “Special day” function. Holidays input Digital input for activating the “Holidays” function. Display inputs 1…4 Here, 4 universal inputs for display purposes can be configured. The unit of these inputs can be defined at menu item Input identifier.
Analog inputs With the analog inputs, the following settings can be made: • Type • Measuring range • Measured value correction Temperature sensor LG-Ni1000 is preselected as standard for all types of temperature sensors.
Digital inputs The digital inputs can accept signals from potential-free contacts for control functions. Main menu > Commissioning > Extra configuration > Miscellaneous > Input identifier Configuration of input Normal position Operating line Setting N.X5 Digital The normal position can be predefined for each digital input.
Common plant components (main pump, system pump, primary controller) must also be connected to the controller with the boiler master. If in total more than two boilers are in operation, the number of boilers must be set on the boiler master. Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler sequence manager Operating line Number of boilers Communication Range 1…6 Factory setting 2 Communication between the 2 RMK770 takes place via KNX bus.
3.7 Completing commissioning If the application is correct, the Commissioning menu can be quit as follows: 1. Press the ESC button. The display shows a dialog box with the following information: Caution! Plant starts ESC 2. OK Confirm by pressing the OK knob. Then, the controller starts using the settings made; the plant is started up, and the Main menu appears on the display. Main menu Commissioning… Boiler sequence manager… Boiler 1… Boiler 2 … 3.
Main menu > Device information > Position 1 or 2 or 3 Operating line Remarks Extension module Display of the module’s type reference Software version Display of software version Hardware version Display of hardware version 3.10 Leaving the password level On completion of commissioning, select the user level (access level for the plant operator). To do this, proceed as follows: 1. After completion of commissioning, you reach the Main menu again. 2.
3.12 Note Plant types and default terminal assignments The terminal markings used are explained at the end of this section. K1.1 N.Q7 N.X3 N.X6 N.Q2 N.Q5 3132S19 N.X1 N.X2 K1.2 N.Q7 N.X1 N.X6 1. 2. N.Q2 N.Q3 1. 2. 3132S20 N.X3 N.Q5 N.Q6 N.X2 K1.3 N.Q7 N.X6 N.Q2 A9.Q1 A9.Q2 N.Q5 A9.Q3 A9.Q4 3132S21 N.X1 N.X3 N.X2 K2.1 N.Q7 N.X6 N.Q2 N.Q5 N.Q1 M 3132S22 N.X1 N.X3 N.Q4 M N.
K2.2 N.Q7 N.X1 N.X6 N.X3 1. 2. N.Q2 N.Q3 3132S23 1. 2. N.Q5 N.Q6 N.Q4 M N.Q1 M N.X2 K2.3 N.Q7 N.X1 N.X6 N.Q2 A9.Q1 A9.Q2 N.Q5 A9.Q3 A9.Q4 N.Q1 M N.Q4 M 3132S24 N.X3 N.X2 K3.1 N.Q7 N.X1 N.Q3 N.Q2 N.Q1 M 3132S25 N.X6 N.X3 N.Q6 N.Q5 N.Q4 M N.X2 K3.2 N.Q7 N.X1 N.X6 N.X3 N.Q2 N.Q3 1. 2. A7.Q1 N.Q1 M N.Q5 N.Q6 3132S26 1. 2. A7.Q2 N.Q4 M N.X2 K3.3 N.Q7 N.Q1 M N.Q3 N.Q5 A9.Q3 A9.Q4 3132S27 N.Q2 A9.Q1 A9.Q2 N.X1 N.X6 N.X3 N.Q6 N.Q4 M N.
K4.1 N.X6 N.Q2 N.Q5 N.X1 3132S28 N.X3 N.Q4 N.Q1 N.X2 K4.2 N.X3 N.X1 N.X6 1. 2. 1. 2. N.Q5 N.Q6 3132S29 N.Q2 N.Q3 N.Q4 N.Q1 N.X2 K4.3 N.X6 N.Q2 A9.Q1 A9.Q2 N.Q5 A9.Q3 A9.Q4 N.X1 3132S30 N.X3 N.Q4 N.Q1 N.X2 K5.1 N.X6 N.Q2 N.Q5 N.X1 3132S31 N.X3 N.Q6 N.Q3 N.Q4 M N.Q1 M N.X2 K5.2 N.X1 N.X6 N.X3 1. 2. 1. 2. N.Q5 N.Q6 A7.Q2 A7.Q1 N.Q1 M 3132S32 N.Q2 N.Q3 N.Q4 M N.
K5.3 N.X6 N.Q2 A9.Q1 A9.Q2 N.Q5 A9.Q3 A9.Q4 N.X1 3132S33 N.X3 N.Q6 N.Q3 N.Q1 M N.Q4 M N.X2 K6.1 N.X1 N.X6 N.X3 N.Q5 3132S34 N.Q2 N.X7 N.X4 N.Q4 N.Q1 A9.Q3 A9.Q4 A9.Q1 A9.Q2 N.X2 K6.2 N.X1 N.X6 N.X3 1. 2. N.Q5 N.Q6 3132S35 N.Q2 N.Q3 1. 2. N.X7 N.X4 N.Q4 N.Q1 A9.Q3 A9.Q4 A9.Q1 A9.Q2 N.X2 K6.3 N.X4 N.Q5 A9(2).Q1 A9(2).Q2 N.X7 N.Q4 N.Q1 A9.Q3 A9.Q4 3132S36 N.Q2 A9.Q1 A9.Q2 N.X1 N.X6 N.X3 A9(2).Q3 A9(2).Q4 N.
4 General settings 4.1 Time of day and date 4.1.1 Operating principle The controller has a yearly clock with time of day, weekday and date. Time format Setting The following time formats are available: Time format Date Example 24 hours dd.mm.yyyy 31.05.2004 (day.month.
If the controller is set as a clock time slave, it can also be selected whether it shall be possible to adjust the master clock’s time of day from this controller.
4.2 Selecting the language Every RMK770 controller has a number of languages loaded. When switching on the controller for the first time, the required language must be entered. But the language can also be changed later during operation. Depending on the type of controller, the following languages with the relevant instructions are available: Setting Product no.
4.5.2 Aggregate names Aggregates boiler 1…6, primary controller, heating circuit and time switch can be given dedicated names. The setting is made on the relevant aggregate. Setting (example for boiler 1) Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler 1 Operating line Boiler 1 Range Max. 20 characters Factory setting Here, text with a maximum of 20 characters can be entered. This designation is then used on the info pages and by the menus.
4.5.5 Resetting text entries The following datapoints cannot be reset: • Device name • File name • Business card line 1…4 All the other texts entered by the user, such as menu texts, fault texts, etc. can be reset at the password level: Main menu > Settings > Texts Operating line Reset text Range No / Yes Factory setting 56/232 Building Technologies HVAC Products Boiler Sequence Controller RMK770 4 General settings CE1P3132en 23.04.
5 General functions, fundamentals 5.1 Time switch A time switch is available for the heating circuit. In “Automatic” mode, the heating circuit, operates according to that time switch. A switching program can be defined for each day of week. Using the program entered, the time switch controls the change of operating modes and the associated setpoints. Operation of the time switch is described in the Operating Instructions (B3133x…). 5.1.
5.1.2 Entering the 24-hour program for space heating For space heating, an individual 24-hour program can be selected for every day. Space heating Main menu > Heating circuit > Time switch Operating line Monday through Sunday Comfort / Precomfort / Economy Comfort / Precomfort / Economy Special day Factory setting 06:00 Comfort 22:00 Economy 06:00 Comfort 22:00 Economy The special day is a 24-hour program that can be activated either via the holidays program or an external contact.
5.1.3 Fault handling For each "Geographical zone", only one time switch master may be used. If several controllers are parameterized as the master, a fault status message is delivered. The message is sent by the controller which receives 2 time switch signals. Fault status messages Number Text Effect 5102 >1 time switch in plant 1 Nonurgent message; must be acknowledged For each “Geographical zone”, only 1 time switch master can be used.
Effect Slave The holidays / special day program in this controller is not active. The program acting is the external holidays / special day program that has the same holidays / special day zone set. The external holiday / special day program must be set as the master holidays / special day program The holidays / special day program in this controller is active.
5.2.4 Calendar entry A maximum of 16 entries can be made. The entries are sorted in chronological order. Every entry must include: • Date, year and starting time • Date and end time • Reason for entry (holidays or special days) Setting Main menu > Heating circuit > Holidays/special days > Calendar Operating line Range Factory setting Entry 1… entry 16 --- / --- / Holidays Start / End / Reason Annually recurring holidays or special days can be entered by setting an asterisk (*) for the annual setting.
Note If other controllers are configured as slaves in the same holidays / special day zone, the digital inputs act on all these controllers also. 5.2.6 Fault handling Per holidays / special day zone, only 1 master can be set. If there is more than 1 master in a zone, fault status message ”>1 hol/spec day program” is delivered. The fault is identified by the holidays / special day master (A) if it receives a holidays / special day signal from some other master (B) in its own zone.
The sequence of frost protection for the plant is as follows: ON TOON 3131D09 Sequence of functions TOOFF ON/OFF OFF 1K -6 -5 -4 -3 -2 -1 0 1 2 3 4 TO Outside temperature Pump Diagram Permanently on <–5 °C (TOON) ON –4…+2 °C On for 10 minutes every 6 hours ON/OFF Permanently off >2 °C (TOOFF) OFF Adjustable are the following temperatures: • TOON: Outside temperature below which frost protection for the plant switches the pump permanently on (frost protection for the plant permanently on) •
To prevent the pumps and valves from seizing, a point in time (kick day and kick time) can be defined at which the pumps are put into operation and the valves are driven to their fully open and fully closed positions. The function can be deactivated (pump / valve kick = ---). It can also be selected whether the function shall apply to pumps only, to valves only, or to both. The selected setting then applies to all pumps and valves connected to the RMK770 controller.
3131B17 Example 2: Heat source, primary controller and heat consumer T T T T T T Heat source Heat consumer Heat consumer Heat consumer / primary controller Heat consumer Heat consumer The heat demand signals can be assigned a priority. If, for example, DHW heating is operated with absolute priority, its heat demand signal must be given priority. This temperature request is therefore the decisive variable.
no more heat. Overrun is typically triggered by a boiler after the burner has shut down in order to prevent overtemperatures in the boiler. On the heat consumers, it can be selected if and to what extent they shall respond to the different load control signals. Heating circuits and DHW circuits always respond to critical locking signals. DHW circuits never respond to uncritical locking signals.
To enable a mixing circuit to control its flow temperature to the setpoint, it requires a higher flow temperature on the inlet side. This elevated temperature can be adjusted separately for each mixing circuit. In the case of maintained boiler return temperature with mixing valve, this elevated temperature is not needed. Here, it must be made certain that the minimum boiler temperature is somewhat higher than the return temperature setpoint.
Setting rules P-band Xp = 2 × Tu / Tg × Δx / Δy × 100% ˜ 2 × Tu / Tg × Ksmax Integral action time Tn = 3 × Tu Example Change of valve position Δy = 40% Change of flow temperature Δx = 18 K Tu = 6 s Tg = 18 s P-band Xp = 2 × 6 s / 18 s × 18 K / 40% × 100% = 30 K Integral action time Tn = 3 × 6 s = 18 s Maximum system gain Ksmax The maximum system gain Ksmax can be estimated from the differential of maximum flow temperature upstream of the mixing valve and the minimum return temperature, for example.
Actuator running time The actuator running time must be matched to the type of actuator used. This setting is important for both 3-position and DC 0…10 V actuators. If in doubt with 3-position actuators, the setting is to be increased since otherwise the actuator will not optimally operate in the range between 0 and 100% stroke (also refer to synchronization pulse in subsection 5.7.3 “Control signal”). P-band Xp The P-band Xp is given in K (Kelvin).
Display values Setting values Main menu > …. > Inputs/setpoints > Operating line Remarks Optg hours pump 0…99'999 h Optg hours pump B 0…99'999 h Main menu > …. > Inputs/setpoints > Operating line Range Factory setting Optg hours pump 0…99'999 h 0h Optg hours pump B 0…99'999 h 0h 5.8.2 Pump supervision and twin pumps Every pump (main pump, boiler pump, system pump, heating circuit pump) can be monitored with a fault input and flow switch. Every pump used can be a twin pump.
Setting Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler sequence manager > Twin pump Main menu > Settings > Boiler … > Twin pump Main menu > Settings > Primary controller > Twin pump Main menu > Settings > Heating circuit > Twin pump Operating line Run priority Range Auto / Twin pump A / Twin pump B –60…0…+60 s Changeover period 5.8.
Pump kick The pump kick acts as follows, depending on the priority of changeover: Operating state of the Impact of pump kick pumps With automatic changeover With fixed assignment Both pumps do not Kick first acts on the pump that Kick first acts on the rerun (summer operawas in operation last serve pump and then on tion) the working pump 1 of the 2 pumps runs Not applicable Kick only acts on the reserve pump Delayed changeover also acts with the pump kick. 5.8.
Overview of function block DC0...10 V close Auto BS Release HD (DC 0…10 V) HD gen. BSS 3 4 2 1 Heating curve DHW Frost protection 6.1 Summer operation Boiler sequence management Main flow 6 HD 5 6 HD DHW Auto HD Frost MnPu_A MnPuEr_A MnPuErFlow WLoLeDet V T PMaxMon P T MnPu_B MnPuEr_B T T TMnFl T TRtMx P T PMinMon TMnRt MnVlvRtMx T TRtCo 3132S57 T 73/232 Building Technologies HVAC Products Boiler sequence controller RMK770 6 Boiler sequence management CE1P3132en 23.04.
BSM * TMnFl TMnRt TrtMx TRtCo HD DC 0…10 V HD gen. HD DHW HD Frost MnPu_A MnPu_B Rel_ BS BSS1 BSS2 MnVlvRtMxUP MNVlvRtMxDN MnVlvRtMx BSS3 DC 0…10 V MnPuEr_A MnPuEr_B MnPuErFlow Er1 (WLoLeDet) Er2 (PMaxMon) Er3 (PMinMon) BSM * = boiler sequence manager Inputs: Outputs: TMnFl TMnRt TRtCo MnPuEr_A MnPuEr_B MnPuErFlow TRtMx Er1 (WLoLeDet) Er2 (PMaxMon) Er3 (PMinMon) BSS1 BSS2 BSS3 Release BS Summer HD DC 0…10 V HD gen. HD DHW HD Frost 6.
If there is no main flow temperature sensor, the following configuration adopts the measured value inside the controller from the boiler sensor of the current lead boiler: Main menu > Commissioning > Extra configuration > Boiler sequence manager > Inputs > Main flow sensor: autonomous This variant can only be used with dual-boiler plant. The main return temperature sensor is highly recommended in connection with a pressureless header; but its configuration can also be deleted.
2 1 T m1 2 1 T TMnFl T . m2 T T TMnFl . m2 T T T TMnRt TMnRt Startup and part load operation (m1 < m2) 3132S59 3132S58 m1 Main flow and main return temperature sensor Setback operation (m2 = 0) Usually, the main flow temperature TMnFl is a mixture of heating circuit return temperature and boiler temperature. The level of mixing depends on the water volumes on the boiler and consumer side.
6.3 Boiler sequence management 6.3.1 Concept TFlx TBo2w TBo1w 3132S60 TFlw MnPu_A TBo TBo T 2 1 T MnPu_B T T T TMnFl TRtMx T T TMnRt T TRtCo MnVlvRtMx With the signal received from the main flow temperature sensor, the boiler sequence manager controls the individual boilers or burner stages of the boiler sequence.
6.3.2 Orders for boilers to be switched on and off As a general rule, the boilers are switched on in ascending order and switched off in descending order: 1–2–3–4–5–6 However, various functions, settings and signals at the control inputs can impact this order. Boiler sequence selector The boiler sequence selector is used to define the lead boiler and the switch-on sequence according to which the boilers are switched on.
1 2 3 D1 4 5 6 7 1 2 3 D2 4 5 6 7 1 2 3 D3 4 5 6 Auto 1 GE Position 1 Position 2 Position 3 Position 4 Position 5 Position 6 Position 7 2 3 4 5 6 Auto Boiler 1 Boiler 2 Boiler 3 Boiler 4 Boiler 5 Boiler 6 3132Z10 7 D1 0 1 0 1 0 1 0 D2 0 0 1 1 0 0 1 D3 0 0 0 0 1 1 1 Automatic boiler changeover In Auto position, the lead boiler and the associated boiler sequence can do an automatic changeover depending on the burner hours run of the lead boiler.
To make certain that changeover to another lead boiler does not take place at an awkward point in time (e.g. on a weekend), the time of changeover (weekday, time of day) can be set. On completion of the period of time set (see settings above), the next boiler is selected as the lead boiler. Fixed lead boiler It may be desirable to always use the same boiler as the lead boiler and to only have the other boilers change their sequence (e.g.
Locking of boiler depending on the outside temperature If required, a boiler can be locked depending on the outside temperature. Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler … > Operation settings Operating line Boiler lock outside temp > Boiler lock outside temp < Range ---- / 5…30 °C ---- / –50…10 °C Factory setting ---- °C ---- °C If the outside temperature exceeds the limit value or drops below it (refer to section 7.
Boiler sequence with 4 boilers and 2-stage burners as an example. Lag boilers with great setpoint increase.
This approach can be chosen only if the output of the basic stage of boiler 2 exceeds the rated capacity of boiler 1. If this strategy is chosen, a fixed boiler sequence makes sense, thereby ensuring that the same boiler is always boiler no. 2. Output stage 1 2 3 4 5 Boiler release 1.1 1.1+1.2 2.1 2.1+2.2 1.1+2.1+2.2 This switch-on order is called binary switching on. With the RMK770, binary switching on is restricted to the first 2 boilers. The next boilers are switched sequentially.
The available boiler operating modes are “Off“, “Summer operation“ and “Auto“. In “Off“ mode, the only heat requests considered are emergency requests (e.g. ”Frost prot request 2-position” at the heat request input). During “Summer operation“, the only heat requests accepted are those from DHW heating (digital input or via KNX bus). All other heat requests are ignored. Emergency requests are always accepted. The “Summer operation“ state is also distributed via the KNX bus.
Summer operation On the basis of the plant’s layout, the number of boilers required for heat generation in the summer are usually known (e.g. for DHW heating). If the “Summer operation“ state is active in the boiler sequence manager, the number of boilers released can be limited. Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler sequence manager > Summer operation Operating line Number of boilers released 6.3.
The moment an additional boiler is switched on, the flow temperature can drop for some time if the boiler was started up from “cold“. To prevent this undershoot from instantly switching on another boiler, a waiting time can be set before performance of the integral is started (TiDly, upward sequence delay).
Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler sequence manager > Control parameters Operating line Downward sequence integral Range 0…500 K×min Factory setting 50 K×min °C TempMnFlow b 53 50 3132D06 The switching off of a boiler can be impacted by the switch-off integral. A small switch-off integral means that removal of a boiler from the boiler sequence is fast.
kW 3132D07 Example 400 400 300 300 250 120 160 350 60 240 80 200 200 60 80 90 105 150 60 180 30 60 60 80 60 60 47.5 95 50 95 90 47.5 100 70 100 K+ 1K 1K 1K 1K 1K 1K 1K 1K 1K 1K The diagram above shows an example with 4 modulating boilers that are sequentially switched on and off. The basic stage of the first boiler be 30% of the rated capacity. As heat consumption increases, each boiler modulates up to 100 kW (100%) before the next boiler is switched on.
6.4 Supervision of main pump Supervision of faults The main pump (main twin pump) can be monitored with an overload input each and/or a flow switch each (… Extra configuration > Boiler sequence manager > Inputs). The parameters for the pump or twin pump fault inputs are fixed and cannot be changed. The fault status signal delay for the flow switch is 60 seconds. The setting parameters for the main twin pump can be found on menu … Settings > Boiler sequence manager > Twin pump.
Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler sequence manager > Fault settings > Fault input 3 Operating line Range Factory setting Fault text A…Z Underpressure Impact of fault Stop / No stop Stop Fault acknowledgement None / Acknowledge / Acknowledge and reset Acknowledge Fault priority Urgent / Nonurgent Urgent Fault status signal delay 00.00…59.55 m.s 00.05 m.s The effect of the “Stop“ fault is that the boiler sequence as a whole is shut down.
Sensor supervision in general Fault status messages More than 1 boiler faulty The other sensors, which also belong to function block “Boiler sequence manager“, such as the return sensor for the common maintained boiler return temperature, or the return sensor for the consumers, are monitored for short-circuit and open-circuit.
The three 2-position heat requests differ in the type of heat request. Depending on the selection of the boiler sequence operating mode (… > Main menu > Boiler sequence manager > Boiler sequence optg mode > Preselection), either all 3 types are evaluated or only individual ones. Boiler sequence optg mode Off Summer operation Auto 6.5.
Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler sequence manager > Demand control Main menu > Settings > Primary controller > Demand control Operating line [Curvepoint 1] outside temp [Curvepoint t 1] flow temp [Curvepoint 2] outside temp [Curvepoint 2] flow temp Digital inputs Range –50…50 °C 0…140 °C –50…50 °C 0…140 °C Factory setting –10 °C 70 °C 20 °C 70 °C A total of 3 types of digital input are available.
3132S71 3132S68 T T T T T T Minimum limitation of the return temperature with separate mixing valve per boiler T Minimum limitation of the return temperature with common mixing valve Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler sequence manager > Limitations Operating line MBRT Return temp minimum Range ---- / 8…140 °C Factory setting ---- °C Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler sequence manager > Return control Operating line Ac
6.6.3 Boiler frost protection Plant frost protection Frost protection For more detailed information, refer to subsection 7.9.9 “Frost protection for the boiler”. Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler sequence manager > Limitations Operating line Frost protection for the plant Range On / Off Factory setting Off Here, it can be selected whether frost protection for the plant shall act on the main pump.
Info page “Boiler sequence manager“ shows the relevant temperatures of the boiler sequence. The info page(s) “Boiler …“ show(s) the relevant temperatures and setpoints of the boiler as well as the state indicating whether the boiler is released.
Operating line Range Fault text for fault input 3 Fault text 0 / 1 (1 = fault) Fault input 3 0 / 1 (1 = overload) [Main pump] overload 0 / 1 (1 = overload) [Main pump B] overload 0 / 1 (0 = no flow) Flow signal pump 0…99999 h Optg hours pump 0…99999 h Optg hours pump B When making diagnostics or the wiring test, logic states are displayed. The input is active when 1 appears on the display.
Main flow temperature supervision Number Text Effect 2396 Main flow temp not reached Nonurgent, must be acknowledged, no plant stop Sensor supervision general Number Text Effect 332 [Boiler seq] MBRT sensor error Nonurgent message; must be acknowledged, no plant stop 333 Consumer return sensor error Nonurgent message; must be acknowledged, no plant stop Number Text Effect 5593 Number of boilers wrong setting Nonurgent message; must not be acknowledged 5594 Invalid lead boiler Nonurg
Boiler control 7.1 Overview of function block TFg T BuSt1 BuSt2 BuMdltUp BuMdltDn BuMdlt_0…10 V BoSetpt PMaxMon(Er2) WLoLeDet(Er1) T TBo 3132S61 DC 0...10 V P BuFb BuMdltFb ErBu T V BoPu_A BoPu_B VlvShOff VlvRtMxUp VlvRtMxDn VlvRtMx_0…10 V close Shutoff valve Setpoint comp. DC 0...10 V close Shutoff valve 7 P TRtBo BoPuEr_A BoPuEr_B BoPuErFlow PMinMon(Er2) ShOffVlvFb 99/232 Building Technologies HVAC Products Boiler sequence controller RMK770 7 Boiler control CE1P3132en 23.04.
3132Z12 T TBo T TRt T TFg ReleaseBo InIndOp InFgMsm BoCtrl BoPuEr_A BoPuEr_B BoPuErFlow Error BuSt1 ErBu BuSt2 BuFb BuMdltUp BuMdltDn Er1 (WloLeDet) BuMdltDn_DC 0…10 V Er2 (PMaxMon) BuSetpt Er3 (PMinMon) BoPu_A ShOffVlvFb BoPu_B VlvShOff VlvRtMxUp BuFb VlvRtMxDn ShOffVlvFb VlvRtMx_DC 0…10 V BuMdltFb Inputs: Tbo TrtBo Release Bo BuFb ErBu BuMdltFb TFg InFgMs BoPuEr_A BoPuEr_B BoPuErFlow ShOffVlvFb Er1 (WLoLeDet) Er2 (PMaxMon) Er3 (PMinMon) InIndOp Boiler sensor Return sensor Release i
7.2 Basic configuration Configuration In the basic configuration, the function block is activated for the application. The type of burner and boiler hydraulics are preselected by choosing the plant type. For more detailed information, refer to section 3.3 “Basic configuration”. Main menu > Commissioning > Basic configuration Operating line Plant type Range Refer to subsection 3.3.1 “Plant types” Factory setting K1.
Outputs Main menu > Commissioning > Extra configuration > Boiler … > Outputs Operating line Burner stage 1 Burner stage 2 Modulating burner 3-pos Modulating burner mod Setpoint compensation Boiler pump Boiler pump B Pump function Shutoff valve Maint boiler return temp 3-pos Maint boiler return temp mod Adjustable values / remarks Boiler pump or bypass pump Boiler sensor With the basic configuration, a boiler temperature sensor is automatically configured for each of the boilers 1 and 2.
Fault burner This terminal can be used for the burner fault status message. Also refer to section 7.13 “Boiler faults”. Fault input 1…3 For additional fault supervisions, there are 3 universal fault inputs available. Also refer to section 7.13 “Boiler faults”. Boiler pump overload Fault input for supervision of the boiler pump Boiler pump B overload Fault input for supervision of boiler pump B in the case of twin pumps. Flow signal Input for flow supervision of the boiler pump.
7.2.2 T T T T T T 3132S65 B 3132S64 A 3132S63 The following pumps are usually present: • One boiler pump per boiler • The main pump for all boilers It is also possible to use a boiler pump as a mixing pump or a combination of mixing pump and main pump. 3132S62 Definition of pumps Boiler hydraulics Boiler pump Boiler mixing pump Main pump Boiler mixing pump and main pump • Plant types K1.x and K2.x use 1 main pump • Plant type K3.x uses 1 main pump and 1 mixing pump • Plant types K4.x, K5.
T 4 VlvShOff BuSt1 3132S69 Y1 Y2 3 If the shutoff valve and the boiler pump are controlled by separate outputs, both boiler pump and burner are switched on only when the shutoff valve is fully open. If there is a checkback signal from the shutoff valve, it must be configured to input “Checkb signal shutoff valve”. If a checkback signal from the shutoff valve is configured and there is no such checkback signal on completion of the adjusted switch-on delay time, a fault status message is generated.
7.3 Additional boilers The basic configuration is used to activate 2 boilers for the boiler sequence. If additional boilers are required, they must be configured in the extra configuration. By assigning a burner stage, the setpoint compensation or a pump to a boiler, the function block of the respective boiler is activated. For more detailed information, also refer to chapter 3 “Commissioning”. 7.
• Setting ”Off“: The boiler also remains off in the event of risk of frost • Setting “On“: The boiler is put into operation to ensure frost protection Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler … > Limitations Outside temperature lock Example Operating line Range Factory setting Frost prot (release input off) Off / On On Each boiler can also be locked as a function of the outside temperature.
3132S70 T T T T T T T T T T 7.7 Test mode and commissioning aids During commissioning and for test purposes, boiler and burner can be put into various operating states via the service level.
Stages 1 + 2 controlled The boiler is released and the burner with its stages 1 and 2 or basic stage and modulating part maintains the adjusted test mode setpoint. Modulating fixed The boiler is released and the modulating burner operates at the modulation level according to the setting made. The burner is switched off when the maximum limit of the boiler temperature is exceeded. 7.8 Control of the burner If a boiler temperature sensor is configured, control is provided according to that sensor.
Minimum burner running time, burner cycling protection If the switch-off point is reached before the minimum burner running time is completed, the burner remains in operation until that time has elapsed (burner cycling protection). The minimum burner running time is given priority. The burner’s switch-off point is raised by half the boiler’s switching differential.
Burner stage 2 The release logic for 2-stage burner operation aims at ensuring an optimum switch-on time for stage 2 which, in addition to a time criterion, also considers the amount of the heat deficit, calculated with a temperature-time integral. Time criterion As soon as the burner’s basic stage is switched on, the minimum locking time for burner stage 2 starts to run. This ensures that the burner always operates in the basic stage for a minimum period of time.
Owing to the performance of the temperature-time integral, it is not only the period of time that is considered, but also the extent of overshoot. This means that when the overshoot is significant, burner stage 2 is locked earlier. When the reset integral (area “b” in the diagram) has reached the set value of the reset integral of stage 2 (point in time treset), burner stage 2 is locked and the basic stage switched off. TBo TBoSp+1/2SDBo TBoSp-1/2SDBo t BSt1 1 0 t INT max. max.
When the demand for heat is small, the basic stage cycles. When the demand for heat increases, the 3-position output or a DC 0…10 V output is used to control the combustion air damper. At the same time, the amount of fuel supplied is also increased, typically via an additional switch on the air damper, or by simultaneous control of the amount of fuel (gas / fuel ratio). P M BV OH Q...
TBo TBoSp+SDBo b TBoSp+½ SDBo TBoSp 1K 1K TBoSp-½ SDBo a a t StBasic d c d 3131D01 StModulat. d Release integral for modulation a b c d SDBo St Basic St Modul.
Proportional band Xp The proportional band has an impact on the controller’s proportional behavior. With a setpoint / actual value deviation of 20 K, a setting of Xp = 20 K produces a manipulated variable corresponding to the damper actuator’s running time. Integral action time Tn The integral action time has an impact on the controller’s integral behavior. Derivative action time Tv The derivative action time has an impact on the controllers D-behavior.
Control action is too fast If the control’s response is too ”hefty” so that it overshoots or starts oscillating, setting parameters Xp, Tn and Tv must be increased in a stepwise fashion. A new readjustment should be made only after the control action resulting from the previous readjustment is completed. TBo 3132D11 TBoSetp t 1. 2. Reduce Xp in steps of about 25% of the previous value. Increase Tv in steps of 2 to 5 seconds. If this is not sufficient: Increase Tn in steps of 10 to 20 seconds. 3. 7.
7.9.1 Maximum limitation of the boiler temperature This setting provides maximum limitation of the boiler temperature setpoint. For burner control, this value represents the switch-off point. In this range, the boiler’s switching differential is calculated downward. Maximum limitation of the boiler temperature is always active. The only exception is the wiring test. TBo TBoMax 80 TBoSp 70 SDBo 60 40 3131D39 50 TBoMin 0 30 20 HD SDB0 Tbo TboMax TboMin TboSP 7.9.
In case of plants with mixing valve for the maintained boiler return temperature, the protective boiler startup function is provided by the mixing valve. In that case, no locking signals for the protective boiler startup is generated. Boiler pump It can be selected whether or not the boiler pump shall be switched off when protective boiler startup is active (pump off).
Without boiler shutdown Using this setting, the boiler is always maintained at the minimum boiler temperature. Automatic boiler shutdown When using this setting, the boiler is operated at the minimum boiler temperature whenever there is a heat request from one of the heat consumers. When there is no heat request, the boiler temperature can drop below its minimum.
7.9.10 Protection against pressure shocks Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler … > Limitations Operating line Range Factory setting Delta boiler temp max (stage 2) 0…10 K 1K To prevent pressure shocks in the gas network if stages 1 and 2 switch off at the same time, stage 2 is already switched off before the maximum boiler temperature is reached the difference being the setting value “Boiler temp max” stage 2.
Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler > Limitations Operating line Bypass pump switching diff Range 1…20 K Factory setting 6K The bypass pump controls the return temperature in 2-position mode within the adjustable switching differential. The pump is activated when there is demand for heat and when the return temperature drops below its minimum limit value.
Configuration of a pair of terminals for a 3-position mixing valve Return temperature setpoint The terminals still available for selection are the free terminal pairs (Q1/Q2, Q3/Q4, Q5/Q6) for the open and the close signal. Normally, special terminal pairs are required for that purpose (RC units for radio interference suppression; for more detailed information, refer to subsection 3.3.2 “Terminal assignment and properties of outputs”).
The maximum value is filtered to suppress faults. As a result, the maximum flue gas temperature rises at the rate of maximum 1 K/s. Supervision of the maximum value If a flue gas temperature limit value is parameterized, a fault status message is delivered when the limit value is crossed.
7.13 Boiler faults If a boiler initiates lockout, it is shut down until the fault is rectified.
Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler … > Fault settings > Checkb signal burner Operating line Range Factory setting Signal delay start Signal interruption operation Impact of fault 00.05…59.55 m.s 00.00…59.55 m.s No stop / Stop 04.00 m.s 20.00 m.s Stop Main menu > Commissioning > Settings > … or Main menu > Settings > Boiler … > Fault settings > Checkb sign shutoff valve Operating line Signal delay start Range 00.05…59.55 m.s Factory setting 02.00 m.
Main menu > Commissioning > Settings > … or Main menu > Settings > Inputs Operating line Normal position Fault supervision boiler pump Range Open / Closed Factory setting Open For more detailed information, refer to section 5.8 “Pump control” 7.14 Burner hours run counter and output balance For stage 1 or the basic stage, a checkback signal can be configured. This checkback signal can be used for the burner hours run counter, the burner start counter, and for calculating the output balance.
7.15 Note Fault boiler temperature sensor Fault status messages This section 7.15 shows the text for each fault number with which the controller is supplied. It can be changed on the password level. Number Text (as supplied) Effect 301 [Boiler 1] boiler sensor error [Boiler 2] boiler sensor error [Boiler 3] boiler sensor error [Boiler 4] boiler sensor error [Boiler 5] boiler sensor error [Boiler 6] boiler sensor error Urgent message; must be acknowledged.
Fault burner Fault burner operation supervision Water shortage Number Text (as supplied) Effect 2301 [K1 burner] fault 2302 [K2 burner] fault 2303 [K3 burner] fault 2304 [K4 burner] fault 2305 [K5 burner] fault 2306 [K6 burner] fault Urgent message; acknowledgement can be parameterized; factory setting: “Acknowledge“. Boiler stop Urgent message; acknowledgement can be parameterized; factory setting: “Acknowledge“.
Overpressure Underpressure Number Text (as supplied) Effect 2324 [Boiler 4] water shortage 2325 [Boiler 5] water shortage 2326 [Boiler 6] water shortage Priority, effect and acknowledgement can be parameterized. Supply state Urgent, boiler stop, must be acknowledged Priority, effect and acknowledgement can be parameterized. Supply state: Urgent, boiler stop, must be acknowledged Priority, effect and acknowledgement can be parameterized.
Fault checkback signal shutoff valve Number Text (as supplied) Effect 2344 [Boiler 4] underpressure 2345 [Boiler 5] underpressure 2346 [Boiler 6] underpressure Priority, effect and acknowledgement can be parameterized. Supply state: Urgent, boiler stop, must be acknowledged Priority, effect and acknowledgement can be parameterized. Supply state: Urgent, boiler stop, must be acknowledged Priority, effect and acknowledgement can be parameterized.
Overload boiler pump Flow fault boiler pump Overload boiler pump B Number 2401 Text (as supplied) [K1 pump] overload Effect Nonurgent message; acknowledgement can be parameterized; factory setting: “Acknowledge“. No boiler stop Nonurgent message; acknowledgement can be parameterized; factory setting: “Acknowledge“. No boiler stop Nonurgent message; acknowledgement can be parameterized; factory setting: “Acknowledge“.
Flow fault boiler pump B Failure boiler pump Number 2431 Text (as supplied) 2432 [K2 pump B] no flow 2433 [K3 pump B] no flow 2434 [K4 pump B] no flow 2435 [K5 pump B] no flow 2436 [K6 pump B] no flow Number 2441 Text (as supplied) [Boiler 1 pump] fault 2442 [Boiler 2 pump] fault 2443 [Boiler 3 pump] fault 2444 [Boiler 4 pump] fault 2445 [Boiler 5 pump] fault [K1 pump B] no flow [Boiler 6 pump] fault Test mode active Number 2371 7.
Operating line Checkb sign shutoff valve [Boiler pump] overload [Boiler pump B] overload Flow signal pump Optg hours pump Optg hours pump B Fault burner Checkback signal burner Hours run stage 1 Hours run stage 2 Burner start counter Current burner output Flue gas temperature Flue gas temperature max Flue gas temperature limit value Flue gas meas mode contact Fault text Fault input 1 Fault text Fault input 2 Fault text Fault input 3 Attenuated outside temp Adjustable values / remarks 0 /1 (1 = checkback si
8 Heat demand and heat requests 8.1 Heat requests The controller can receive heat requests: • From the internal heating circuit • From external controllers (KNX) via bus • As continuous DC 0…10 V signals • As 2-position signals Heat requests can be delivered either directly or via the primary controller.
Notes Direct delivery is described in chapter 6 “Boiler sequence management” and delivery via the primary controller in chapter 9 “Precontrol”. The special case of weather-dependent setpoint compensation for boiler sequencing is described in the following section. 8.2 Weather-compensated setpoint for boiler sequencing There may be a need to operate the boiler sequence according to a weathercompensated setpoint without having a heating circuit.
Example: Air handling plant 3131B05 The heat demand transformer converts the position heat request signals (in %) to heat demand signals with a flow temperature setpoint. The following example of an air handling plant shows this. T 3131B06 Room unit (in reference room) Air supply area Ventilation Central air handling RMU... T 0...
Flow temperature (Curve point 1): Flow temp. 3131D20 Adaptation of flow temperature Max. flow temp. readjustment 1 (Curve point 2): Flow temp. 2 (Curve point 1): (Curve point 2): Outside temp. Outside temp.
Precontrol 9.1 Overview of function block Flow Heating curve DHW 9 close DC 0...10 V Primary controller TFl T T TRt TFl TRt 3132S82 T Precontrol Flow temperature Return temperature 9.2 Configuration Basic configuration Function block “Primary controller“ must always be activated in the extra configuration. Extra configuration The function block is activated by assigning an output to a terminal.
Heat requests The heat requests can be received from other devices via bus. In addition, there are 3 binary inputs and 1 analog input for signalling heat requests. 9.3 Types of primary controller 3133S76 3133S78 If only a pump or twin pump is configured, the primary controller consists of system pump control. If, in addition, a mixing valve is configured, the primary controller consists of mixing circuit control plus pump or twin pump control.
9.4 Plant operation Plant operation indicates whether the primary controller is switched on and whether the pump runs.
• Heat demand signals from individual room controllers for air heating coils • Heat demand signals from primary air handling plant A heat demand transformer converts the last 3 signals to a flow temperature setpoint. In addition, 3 digital and/or 1 analog input can be configured on the controller as heat request inputs.
9.5.
Load control 9.6 Control of mixing valve 9.6.1 General The thermal output of mixing valve control can be reduced by functions of a higher priority (e.g. limitation of the return temperature) or by functions of other plant (boiler, DHW heating) via load control. The following mixing valve settings are valid for both 3-position and DC 0…10 V actuators.
Frost protection for the plant 9.8 Limit and protective functions 9.8.1 Frost protection Here, the setting is made whether or not function “Frost protection for the plant” shall act on the pump for precontrol. For more detailed information about frost protection for the plant, refer to section 5.4 “Pump overrun and mixing valve overrun”. Function “Frost protection for the plant“ is only available if an outside sensor is installed (locally or connected via KNX bus). The function can be deactivated.
Settings Main menu > Commissioning > Settings > … or Main menu > Settings > Primary controller > Limitations Operating line Range Flow temperature max 0…140 °C Flow temperature min ---- / 0…140 °C Flow temperature rise max ---- / 1…600 K/h System pump locking signal Off / On Frost protection for the plant Off / On 9.8.
TRtLim TOeff TrtLim Toeff Curvepoint 1 Curvepoint 2 Special cases: Limit value of return temperature limitation Composite (effectively acting) outside temperature Maximum limit value of the return temperature, effective at low outside temperatures Minimum limit value of the return temperature, effective at high outside temperatures Setting Return temperature curvepoint 1 = Return temperature curvepoint 2 Outside temperature curvepoint 1 = Outside temperature curvepoint 2 Return temperature curvepoint 1
Settings Main menu > Commissioning > Settings > … or Main menu > Settings > Primary controller > Limitations > Pulse limitation Operating line Meter input Range ---- / 1…4 Factory setting ---- Type of limitation Absolute / Scaled Absolute Limit value 5…4000 pulses/min 75 pulses/min Integral action time Tn 0…255 min 60 min Meter input The meter input is an input of function block “Meters“ that is used for pulse limitation. Only inputs configured to a terminal can be selected.
9.10 Fault handling Note This section 9.10 shows the text for each fault number with which the controller is supplied. It can be changed on the password level. Fault handling When commissioning is completed (Commissioning menu quit), the system checks whether the configured sensors have been connected. In the event of an open-circuit or short-circuit, a fault status message is delivered.
Operating line Range [System pump B] overload 0 / 1 (1 = overload) Flow signal pump 0 / 1 (0 = no flow) Optg hours pump 0…99999 h Optg hours pump B 0…99999 h When making diagnostics or the wiring test, logic states are displayed. The input is active when 1 appears on the display. If “Normal position open“ is selected, this is the case when the contact is closed; if “Normal position closed“ is selected, this is the case when the contact is open.
10 Heating circuit control 10.1 Overview of function block close Heating circuit Timer function Special day input Holidays input Heating circuit diagram T TO HCtrVlvMx TR TFlHCtr T HCtrPu T 3133S101 HCtrPu_B T TRtHCtr HctrPu HctrPu_B HCtrVlvMx TFlHCtr TO TR TRtHCtr Heating circuit pump Heating circuit pump B Heating circuit mixing valve Flow temperature sensor Outside sensor Room temperature sensor Return temperature sensor 10.
Virtual heating circuit Using setting “Heating circuit = Active“, a virtual heating circuit can be activated, which predefines heat demand according to the outside temperature or the heating curve (for that purpose, a measured value of the outside temperature must be available), without having this measured value available for the flow sensor and the actuating devices.
10.2.1 3-position or modulating mixing valve Mixing valve control can be accomplished with a 3-position mixing valve or a mixing valve using DC 0…10 V control. The type of actuator is selected in the extra configuration.
Preselection Economy Protection Use This operating mode is suited when the room is not occupied for a few hours or when a reduced room temperature is desired. Economy mode is usually selected for the night With this operating mode, the room is heated only when there is risk of frost, which could lead to frozen pipes, etc. The room temperature is maintained at a level above 0 °C. The room temperature setpoint depends on the room operating mode.
10.3.2 User requests from the room Overriding the 24-hour program The user is given a number of choices to override the current 24-hour program and to change the setpoint. Following can be used to override operation from the room: • Switches or buttons (directly connected) • KNX operator units (e.g. QAW740) • Bus operator unit RMZ792 Room unit QAW740 The QAW740 room unit enables the user to select the room operating mode via the Mode or timer button.
10.3.4 Timer function Using a configured input, the pulse triggered via a button can be acquired to extend mode. The timer’s time can be adjusted. Comfort mode when in The timer function is immediately activated.
3121A05 AC 24 V G G Qx3 Qx3 G0 Qx4 Qx4 G N1 M D1 M D2 G0 N2 G0 N1 N2 Configuration of the 2 operating mode relays Settings RMK770 Synco™200 RLU2… Main menu > Commissioning > Extra configuration > Heating circuit > Outputs Operating line Operating mode relay 1 Adjustable values / display / remarks --- / N.Q1…, etc. (free relays only) / Assign operating mode relay Operating mode relay 2 --- / N.Q1…, etc.
10.3.6 Plant operation Plant operation indicates whether the heating circuit is switched on and whether the pump operates.
12 10 11 7 8 6 4 5 3 2 1 Priority Name c Wiring test Explanation In the wiring test (highest priority), the plant components can be directly controlled, independent of all other settings The controller-internal safety functions will be overridden! d e f g Plant operation selector The plant operating mode selector has the second highest priority and can only be overridden by the controller’s frost protection External master If the heating circuit operates in a room control combination as a sla
Priority Name h Presence and timer i / j button k Special day contact l Holidays contact Calendar Time switch 10.4 Explanation The current time program can be overridden by presence button h or timer button i. The timer button at digital input j (or of a thirdparty KNX device) can also override the room operating mode. If 2 or more functions are triggered, the function activated last prevails. The current 24-hour program gets overridden by the special day contact.
10.4.2 Increasing the Economy setpoint 3133D04 The room temperature setpoint of Economy mode is increased depending on the composite outside temperature. The increase is greater at low outside temperatures and zero at high outside temperatures; the transitions are adjustable. The function helps prevent peak loads when changing from Economy to Precomfort or Comfort mode.
0K 3133D11 +10 K 0K 0K Setpt C H Cmf -10 K z.B. / e.g.: Setpt C Prt 32 °C Setpt C Eco 28 °C Setpt C PreC 25 °C Setpt C Cmf 23 °C Setpt H Cmf 21 °C Setpt H PreC 19 °C Setpt H Eco 16 °C Setpt H Prt 12 °C C Cmf Eco H PreC Prt Setpt Impact on the Comfort setpoint Cooling Comfort Economy Heating Precomfort Protection Setpoint is the setpoint selected with the remote setpoint adThe current Comfort setpoint juster.
Impact on the Economy setpoint The Economy setpoints are shifted only if, otherwise, the Precomfort setpoints would lie outside the Economy setpoints (also refer to the diagram above).
Attenuated outside temperature To determine the heating limit (summer / winter operation), the attenuated outside temperature is required (refer to section below). Heating curve The heating curve is defined by the 2 curvepoints at the design temperature and the theoretical heating limit. Heat transmission in the space is not linear, however. When the difference between flow temperature and room temperature is small, the rate of heat transmission diminishes. This is considered by the heating curve.
To 25 To 20 ToStrDmp 15 Toeff 10 3131D23 5 0 t Settings Main menu > Commissioning > Settings > … or Main menu > Settings > Heating circuit > Space heating Operating line Building time constant Heating curve Range 0…100 h Factory setting 20 h Main menu > Settings > Heating circuit > Heating curve or Main menu > Heating circuit > Heating curve Operating line Proportion of windows Range 0…100% Factory setting 50% 10.5.
Inflection point With a radiator exponent nH between 1…1.5, the heating curve is only slightly deflected and can therefore be replaced by linearized sections. This is achieved by setting another curvepoint, the so-called inflection point. The inflection point lies 30% below the outside temperature at which the flow temperature setpoint is 20 °C and the outside temperature A at curvepoint c.
10.5.3 Influence on the flow temperature setpoint Basis for the flow temperature setpoint is the heating curve. In addition, the setpoint is influenced by the following variables: • Room setpoints • Actual value of the room temperature • Morning boost (refer to subsection 10.7.3 “Quick setback and boost heating”) Influence of the room temperature setpoint The basic heating curve applies to a room temperature setpoint of 20 °C.
TFl SpTFlDe + TOeff + SpTFlHi - + SpTRN TODe + - TR Rule of thumb TR × V - TOHi TOeff SpTR 3131B20 + SpTR TFl 20 °C Due to the room temperature deviation ΔTV, the change of flow temperature setpoint corresponds roughly to the value of: ΔTFl=ΔTR × V × (sHc + 1) ΔTFl Flow temperature setpoint change ΔTR Room temperature setpoint change V sHc Heating curve slope Sp Setpoint TRx Room temperature Room influence During boost heating, the room temperature setpoint boost also produces an incr
• When all 3 temperatures lie 1 °C below the Comfort heating limit, heat is released in Comfort and Precomfort mode • When 1 of the 3 temperatures lies above the Comfort heating limit, the delivery of heat is locked Comfort heating limit ⇒ Economy heating limit If a change was made to “Continuously Comfort”, the heating limit function is inactive, which means that continuous heating is provided in accordance with the heating curve.
Main menu > Commissioning > Settings > … or Main menu > Settings > Heating circuit > Mixing circuit controller Operating line Actuator running time P-band Xp Integral action time Tn Range 1…600 s 1…100 K 0…600 s Factory setting 150 s 50 K 60 s For more detailed information about mixing valve control and its setting aids, refer to section 5.7 “Mixing valve control”. 10.6.2 Load control The heat output of mixing valve control can be reduced by functions of higher priority (e.g.
10.7 Optimization functions The optimization functions are activated or influenced by the following settings: Settings Main menu > Commissioning > Settings > … or Main menu > Settings > Heating circuit > Optimizations / Influences Operating line Type of optimization Forward shift on max Early shutdown max Quick setback [Boost heating] setpoint increase Room temperature rise 10.7.1 Range With room model / With room temp sensor 0…48 h 00.00…06.00 h.
10.7.2 Optimum start / stop control Optimum start control The purpose of optimum start control is to reach a temperature level 0.25 K below the Comfort or Precomfort setpoint when occupancy according to the time program starts. For that, the heating circuit must be switched on at an earlier point in time. If a room temperature sensor is connected, the controller calculates the forward shift depending on the current room temperature.
Room temperature If a room temperature sensor is connected, the actual value room temperature is used for aborting quick setback. If there is no sensor, the temperature of the room model is used to make the calculation. In that case, the setback time depends on the outside temperature and the building time constant. Morning boost The purpose of the “Boost heating” function is to have a shorter heating up time. During boost heating, the room temperature setpoint is raised by an adjustable value.
TRx TR TRw + TR TRw + TR - TRSD TRw on Pump off t TR TRSD on TRw t ΔTR TR TRSD TRw TRx TR 3131D38 off Temperature differential for switching the heating circuit off Time Room temperature Temperature differential for switching the heating circuit on Room temperature setpoint Actual room temperature Main menu > Commissioning > Settings > … or Main menu > Settings > Heating circuit > Limitations Settings Operating line Room limitation increase Room lim switching differential Range ---- (none) / 0
Settings Main menu > Commissioning > Settings > … or Main menu > Settings > Heating circuit > Limitations Operating line [Curvepoint 1] outside temp [Curvepoint 1] return temp [Curvepoint 2] outside temp [Curvepoint 2] return temp Maximum limitation Range –50…50 °C ---- / 0…140 °C –50…50 °C ---- / 0…140 °C Factory setting –11 °C ----°C 15 °C ----°C The maximum limit value of the return temperature is either constant or changes depending on the outside temperature.
10.8.3 Pulse limitation The heating circuit can accept pulses for limiting the output of heat or the volumetric flow. Prerequisite for pulse limitation is a heating circuit plant with mixing valve. Meter inputs Settings The pulses are delivered via the meter inputs of function block “Meters”. For more detailed information about function block “Meters”, refer to chapter 11 “Data acquisition“. After having configured one or several meter inputs, pulse limitation can be set up.
Setting --- deactivates the function. TVw TVw 2522D07 t Maximum boost = ΔTVw / Δt t t Time Δt Unit of time TVw Flow temperature setpoint ΔTVw Rate of setpoint boost per unit of time Settings Main menu > Commissioning > Settings > … or Main menu > Settings > Heating circuit > Limitations Operating line Flow temp rise max Flow temperature max Flow temperature min Frost protection for the plant Range ---- (none) / 1…600 K/h 0…140 °C ---- (none) / 0…140 °C Off / On Factory setting ---80 °C ---On 10.
The temperature request for the current heat demand is calculated based on the flow temperature setpoint of the heating circuit (refer to subsections 10.5.2 “Heating curve” and 10.5.3 “Influence on the flow temperature setpoint”) plus an adjustable setpoint increase for the mixing valve.
Type of sensor The type of room temperature sensor can be selected (example with input terminal RMK770.X4): Main menu > Commissioning > Settings > … or Main menu > Settings > Inputs > RMK770.X4 > Type The following choices are available: • LG-Ni1000 • 2 × LG-Ni1000 • T1 • Pt1000 • DC 0…10 V A maximum of 2 LG-Ni1000 sensors can be connected to the same terminal. The controller does not automatically identify that.
1 room sensor directly connected and 1 KNX room sensor (or 1 room unit QAW740) Effect When communication is activated, the heating circuit receives the room temperature of the same geographical zone. The heating circuit operates with the average of the 2 temperature signals received. When communication is activated, the heating circuit receives the room temperature of the same geographical zone. The heating circuit operates with the average of the 2 temperature signals received.
Problem: The basic load is covered by a heating circuit with weather-compensated control and the load-dependent part by a second heating circuit with or without room influence. The 2 heating circuits shall operate in parallel and be controlled by a common switching program or a room operating mode selector.
Important The ventilation controller’s room temperature sensor must not be installed in the extract air duct! Otherwise, functions “Room temperature influence” and “Type of optimization” with room temperature may not be activated. 10.11 Fault handling As soon as commissioning is completed (by quitting the Commissioning menu), a check is made to see if the configured sensors are connected. In the event of an open-circuit or short-circuit, a fault status message is delivered.
Fault heating circuit pump Number 2521 2522 2523 2524 2525 Text (as supplied) [Heat circuit pump] overload [Heat circuit pump B] overload [Heat circuit pump] no flow [Heat circuit pump B] no flow [Heating circuit pump] fault Effect Nonurgent message. Acknowledgement can be parameterized; factory setting: ”Acknowledgement“ Nonurgent message.
Outputs Main menu > Heating circuit > Outputs Operating line Mixing valve position Heating circuit pump Heating circuit pump B Heating limit relay Operating mode relay 1 Operating mode relay 2 Limitations Adjustable values / remarks 0…100% (3-position or modulating) Off / On Off / On Off / On Off / On Off / On Main menu > Heating circuit > Limitations Operating line Flow temperature max Flow temperature min Flow temperature increase Return temperature max Pulse limitation Adjustable values / remarks In
11 Data acquisition 11.1 Trend 4 1 2 11.1.1 Connections and use Trend Purpose Function block ”Trend” is used for time-related recording of measured values. It provides 4 independent trend channels. A trend channel can record 1 measured value. Each trend view can display 2 trend channels: Primary channel plus extra channel as a reference. It is possible to record signals from local inputs of the controller plus room and outside temperatures via bus. 11.1.
11.1.3 Settings Explanations relating to the settings Trend function settings Main menu > Settings > Data acquisition > Trend > Trend channel 1…4 Operating line Trend channel 1… Trend channel 4 Adjustable values / remarks Channel name (editable text, max. 20 characters) Trend signal Assign trend signal: ---, room temperature via bus, outside temperature via bus, N.X1…A9(3).
11.2 Trend signal not available Fault handling If a trend signal at the local inputs is no longer available (e.g. due to a faulty sensor), trends are no longer recorded. In this case, observe the fault status messages under: Main menu > Faults > Faults current If the values are not available via bus, trends are no longer recorded. After a power failure or when quitting the Extra configuration menu (restart controller), the values of the 8-hour and 8-minute views are deleted.
The pulse values represent: • Energy in kJ, MJ, GJ, Wh, kWh or MWh • Volume in m3, l or ml • Variables without unit (max. 3 decimal places) • Heat cost unit • BTU (British Thermal Unit) The pulses are converted to consumption values as per the setting values, added, and the cumulated values are stored as 15-month values at midnight upon month rollover. The meters are used to optimize plant operation. Also, they are mandatory for pulse limitation.
Pulse valency Main menu > Commissioning > Settings or Main menu > Settings > Data acquisition > Meter 1 (or 2, 3 or 4) Operating line Pulse unit Pulse valency numerator Pulse valency denominator Range Wh / kWh / MWh / kJ / MJ / GJ / ml / l / m3 / Heat cost unit / No unit / BTU 1…9999 1…9999 Factory setting kWh 1 1 11.3.4 Overflow value The overflow value ensures that the displayed readings on the connected meter and on the RMK770 controller are identical.
11.3.7 Assignment of texts Each meter can be assigned specific text. This text appears on the operating pages in the form of menu text and datapoint text. Settings Main menu > Commissioning > Settings … or Main menu > Settings > Data acquisition > Meter 1 (or 2, 3 or 4) Operating line Meter reading 1* Range Max. 20 characters Factory setting Meter reading 1* * Or meter reading 2, 3 or 4 11.3.8 Fault handling Battery-powered and mechanical meters also continue to operate in the event of a power failure.
Overview of function block Display 4 12.1 Display 2 Function block “Miscellaneous“ Display 1 12 Miscellaneous 12.2 Configuration Function block “Miscellaneous” is automatically provided for all basic types. To activate the function block, special basic configuration is not required. Extra configuration Inputs The functions required for the plants can be activated in the extra configuration.
The outside temperature can be delivered by different sources: • Locally connected to a terminal • Delivered via bus The following variants are available: Variant Outside temperature locally at terminal. Communication outside temperature not active Effect Controller operates with its own outside temperature. No impact on the bus Outside temperature locally at terminal. Communication outside temperature active Controller operates with its own outside temperature.
12.3.1 Outside temperature simulation To test the response of the plant, an outside temperature can be simulated and the measured value of the outside temperature (outside sensor or bus) can be overridden. Main menu > Miscellaneous > Inputs Operating line Outside temperature simulation Range ---- / –50.0…+50.0 °C Factory setting ---- During the simulation, it is also the simulated outside temperature that is used for the composite and the attenuated outside temperature.
12.4 Display inputs On the RMK770, 4 universal inputs can be defined for display purposes. Main menu > Commissioning > Extra configuration > Miscellaneous > Inputs Operating line Display input 1 Display input 2 Display input 3 Display input 4 Adjustable values / remarks Assign terminal Assign terminal Assign terminal Assign terminal The type or unit of the display input can be selected with the input identifier.
12.
13 Function block “Faults“ 13.1 Overview of function block Shutoff valve Fault button The task of function block “Faults” is to collect and evaluate all fault status messages, and to trigger appropriate actions to prevent damage to the building and plant. The function block is always active for internal fault status messages.
Indication Button is not lit Button blinks Button is lit Cause / procedure No fault present • There is a fault which has not been acknowledged. After pressing the button, the button remains lit until the fault is rectified • There was a temporary fault which, at the moment, can be no longer detected, demanding on acknowledgement which has not yet been made.
Acknowledgement (standard fault) These types of fault require an acknowledgement. Example If a plant uses more than 1 time switch master in the same geographical zone, this fault status message must be acknowledged. Acknowledgement and reset (extended fault) There is an acknowledgement and a reset required for this type of fault.
13.6 Simple fault State diagrams of the individual types of fault A simple fault need not be acknowledged. If there is a fault relay (see below), it must be reset, however. No fault (acknowledged) Fault coming Faulty (acknowledged) 3131B09 Fault going When there is a simple fault, the LED is lit. When the fault is corrected, the LED extinguishes. If a fault relay is configured, the LED blinks when the fault occurs and the relay is energized.
Extended faults are faults that must be acknowledged and reset. This is the case with a twin pump, for example, when both pumps signal a fault. The pumps start running again only after the fault has been acknowledged, corrected and reset.
Main menu > Commissioning > Settings > … or Main menu > Settings > Inputs > RMK770.D… (or RMZ78…) Operating line Normal position Range Open / Closed Factory setting Open Following can be set for each fault status message: Main menu > Commissioning > Settings > … or Main menu > Settings > Faults > Fault input 1 (or 2, 3 or 4) Operating line Fault text Range Max. 20 characters Fault status signal delay Fault acknowledgement 00.00…59.55 m.
>1 fault input fault The fault with the highest priority is sent via KNX bus. If more than 1 fault input with priority “Urgent“ want to signal a fault, message ”>1 fault input faulty“ is delivered with the highest priority. Without this fault status message, the message from only 1 fault input would appear. Fault handling The digital status inputs cannot be monitored. We recommend to use wiring ensuring that the signal drops out when a fault is pending. 13.8.
13.9 Communication When communication is activated, the impact on fault handling is as follows: • Fault status messages are always delivered via bus and can be further handled by other Synco™ 700 devices • Fault status messages from other Synco™ 700 devices are shown on the controller • Fault status messages from other Synco™ 700 devices can be delivered to a fault relay Fault status messages can be acknowledged from a remote location (e.g. from the operator station using the OCI700.1 service tool).
Setting values Main menu > Commissioning > Settings or Main menu > Settings > Faults > Fault relay 1 (or 2) Operating line Fault priority Range Urgent / Nonurgent / All Factory setting All Indication of fault* Fault internal (optically) / Fault internal (audibly) / Fault via bus (audibly) Fault internal (audibly)** Inversion No / Yes No * Maximum 1 bus fault status message can be handled, even if they have different priorities Recommendation: Do not configure 2 bus fault relays ** Factory setting
13.11 Display of faults The current state of the fault status messages can be interrogated on the operator unit. Faults current The current faults include all faults currently pending. A maximum of 10 faults can be displayed. Following is displayed with every fault: • Fault text • Fault number • Time of day and date the fault occurred Fault history Here, the last 10 faults are displayed.
When making diagnostics or the wiring test, logic states are displayed. The input is active when 1 appears on the display. If “Normal position open“ is selected, this is the case when the contact is closed; if “Normal position closed“ is selected, this is the case when the contact is open. Main menu > Commissioning > Wiring test > Faults > Outputs Operating line Range Fault relay 1 Fault relay 2 Off / On Off / On 13.
14 Communication A detailed description of communication is given in Basic Documentation “Communication via KNX bus” (P3127). In the following, the most important settings required for commissioning a multiboiler plant are described.
Time of day Time of day Device 1 Device 2 Master Slave Legend for all figures in this chapter: 3131Z07 RM.. RM..
Holiday/special day Holiday/Special day Calendar operation: Master Calendar operation: Slave Calendar zone: 1 14.3 Calendar zone: 1 Room data Every heating circuit belongs to a geographical zone. The zone represents the room to be controlled. Within the zone, the data related to the room are exchanged: • The room operating mode • The room temperature • The setpoints 14.3.
Time switch slave If the time switch shall operate as a slave of a master time switch, the geographical zone of the master time switch must be set here. If this is the case, no more time switch data are sent via the geographical zone. But the geographical zone is still required for communication with the room unit. The geographical zone must have some other setting value.
The boiler sequence manager is always in the controller with the main flow sensor. Usually, boiler 1 is also controlled by the controller with the main flow sensor. Normally, boiler 1 is assigned boiler address 1, boiler 2 boiler address 2, etc. In normal situations, no changes are required here. When, in the above example, boilers 1 and 2 are assigned to the first RMK770, boilers 3 and 4 of the second RMK770 should also be called boilers 3 and 4.
14.5.1 Heat demand and load control The heat demand and the load control signals are exchanged via the heat distribution zones. Main menu > Commissioning > Communication > Distribution zones Operating line Range Factory setting Heat distribution zone Heat distr zone consumer side Outside temperature zone 1…31 ---- / 1…31 ---- / 1…31 1 2 1 In case of boiler sequencing, the boiler sequence manager receives the heat demand signals.
14.6 Fault handling The RMK770 controller has maximum 1 heating circuit and 1 time switch. Index 1 indicates that the fault occurred on this plant. Bus power supply fault Clock time fault System time switch fault Fault in connection with holidays / special day program Room master and zone fault in heating circuit 1 Number Text Effect 5000 No bus power supply No bus power supply.
Addressing fault Boiler addressing fault Number Text Effect 6001 >1 identical device address More than 1 device with the same device address. Urgent message; must be acknowledged Number Text Effect 5512 >1 boiler with address number 1 2 boilers with boiler address 1. Nonurgent message; must be acknowledged 2 boilers with boiler address 2 Nonurgent message; must be acknowledged 2 boilers with boiler address 3. Nonurgent message; must be acknowledged 2 boilers with boiler address 4.
15 Fault tracing support If a fault is displayed, it is always practical to select the Main menu, operating line ”Faults > Faults current”, and look for any pending fault status messages before starting to rectify a fault. If an extension module is faulty, that fault must be corrected first because it can lead to sub sequential fault status messages. For a detailed description of the display, acknowledgement and resetting of faults, refer to subsection 13.5.1 “Acknowledgement and reset“. 15.
Number 2302 2303 2304 2305 2306 2311 2312 2313 2314 2315 2316 2321 2322 2323 2324 2325 2326 2331 2332 2333 2334 2335 2336 2341 2342 2343 2344 2345 2346 2351 2352 2353 2354 2355 2356 2361 2362 2363 2364 2365 2366 2371 2391 Name (as supplied) [B2 burner] fault [B3 burner] fault [B4 burner] fault [B5 burner] fault [B6 burner] fault [B1 burner] no checkback signal [B2 burner] no checkback signal [B3 burner] no checkback signal [B4 burner] no checkback signal [B5 burner] no checkback signal [B6 burner] no check
Number 2411 2412 2413 2414 2415 2416 2421 2422 2423 2424 2425 2426 2431 2432 2433 2434 2435 2436 2441 2442 2443 2444 2445 2446 2491 2492 Name (as supplied) [B1 pump] no flow [B2 pump] no flow [B3 pump] no flow [B4 pump] no flow [B5 pump] no flow [B6 pump] no flow [B1 pump B] overload [B2 pump B] overload [B3 pump B] overload [B4 pump B] overload [B5 pump B] overload [B6 pump B] overload [B1 pump B] no flow [B2 pump B] no flow [B3 pump B] no flow [B4 pump B] no flow [B5 pump B] no flow [B6 pump B] no flow [
Number 5532 Name (as supplied) >1 boiler with address number 3 For explanation, refer to section … 14.6 5542 5552 >1 boiler with address number 4 >1 boiler with address number 5 14.6 14.6 5562 5591 5592 5593 >1 boiler with address number 6 Failure boiler sequence manager >1 boiler sequence manager Number of boilers wrong setting 14.6 14.6 14.6 6.8 5594 Invalid lead boiler 6.
Use 16 Addendum 16.1 Configuration diagrams Use of the configuration diagrams is explained in subsection 3.3.5 „Use of configuration diagrams“ 16.1.1 Terminal markings The designations of the signal inputs and outputs and of the assigned connection terminals are structured according to the following pattern: Example N.X3 N.D1 A9(2).Y1 N.
16.1.4 Configuration diagram plant type K 219/232 Building Technologies HVAC Products Boiler sequence controller RMK770 16 Addendum CE1P3132en 23.04.
16.1.5 Configuration diagram plant type K1.1 220/232 Building Technologies HVAC Products Boiler Sequence Controller RMK770 16 Addendum CE1P3132en 23.04.
16.2 Editable texts The following list of editable texts shall serve as an aid for engineering and commissioning. The maximum text length is 20 characters. On the password level, operating texts, such as menu, fault or datapoint texts can be reset as follows: Main menu > Settings > Texts Note Operating line Adjustable values / display / remarks Reset No / Yes The texts of the datapoints “Device name“, “File“ and “Business card line 1…4“ on the Texts menu are not deleted when making a reset. 16.2.
Main menu > Settings > Boiler 1 (or 2…6) > Fault settings Datapoint name Factory setting [Boiler x] boiler sensor error [Bx] boil sens err [Boiler x] return sensor error [Bx] ret sens err [Bx] flue gas temp sensor error [Bx] flue gas s err [Bx] flue gas overtemperature [Bx] flue gas o’temp [Bx burner] fault [Bx burner] fault [Bx burner] no checkback signal [Bx bu] no ch’back sign [Bx valve] no checkback signal [Bx va] no ch’back sign [Bx pump] overload [Bx P] overload [Bx pump] no flow [B
16.2.5 Faults Main menu > Settings > Faults > Fault input 1 (or 2, 3 or 4) Datapoint name Factory setting Fault text 1: [Fault input 1] fault Fault text 2: [Fault input 2] fault Fault text 3: [Fault input 3] fault Fault text 4: [Fault input 4] fault 16.2.6 Meters Main menu > Settings > Data acquisition > Meter 1 (or 2, 3 or 4) Datapoint name Factory setting Meter 1: Meter 1 Meter 2: Meter 2 Meter 3: Meter 3 Meter 4: Meter 4 16.2.
16.3 Info pages From the start page (Welcome picture), the Info level (refer to subsection 2.2.3 “Operating levels”) is reached by pressing the INFO button. Here, you find the key plant data listed. No values can be changed here. The Info level comprises several pages. The display depends on the type of plant. When pressing the INFO button, a change is made from one Info page to the next. Using the OK button, it is possible to scroll through the Info pages in both directions.
Heating circuit Actual value flow temperature Flow temperature setpoint State Cause Heating circuit Actual value room temp Current room temp setpoint Actual value outside temp Display values Actual value outside temp Display input 1 Display input 2 Display input 3 Display input 4 Fault inputs Fault input 1 Fault input 2 Fault input 3 Fault input 4 Device state Fault number Fault status message bus Fault number Device address Service information 225/232 Building Technologies HVAC Products Boiler sequence c
Index 2 2-position control of 1-stage burners......................109 2-position control of 2-stage burners......................110 A Access right, access levels ......................................18 Acknowledgement ..................................................196 Acquisition of the room temperature ......................177 ACS7… ........................................................18, 46, 54 Additional boilers ....................................................
Device name ............................................................ 54 DHW ........................................................................ 84 DHW heating............................................................ 65 DHW request 2-position........................................... 93 Diagnostics .............................................................. 95 Digital inputs ............................................................ 43 Display examples.......................................
I Increasing the Economy setpoint ...........................160 Individual operation ................................................107 Inflection point heating curve..................................164 Influence on the flow temperature setpoint ............166 Info level ...........................................................17, 224 Info pages...............................................................224 Input signals .............................................................43 Installation .
Pressure shocks .................................................... 120 Priorities boiler sequence......................................... 81 Product documentation ............................................ 13 Product range .......................................................... 11 Properties outputs.................................................... 31 Proportion of windows............................................ 163 Protection against boiler overtemperatures ...........
Use ...........................................................................14 User requests from the room..................................154 User-defined text ....................................................221 V Valve kick in general ........................................63, 119 Valve kick primary controller ..................................147 Valve kick, heating circuit .......................................176 Views, trend............................................................
/232 Building Technologies HVAC Products Boiler Sequence Controller RMK770 Revision history CE1P3132en 23.04.
Siemens Switzerland Ltd Industry Sector Building Technologies Division International Headquarters HVAC Products Gubelstrasse 22 CH-6301 Zug Tel. +41 41 724 24 24 Fax +41 41 724 35 22 www.sbt.siemens.com © 2004-2009 Siemens Switzerland Ltd Subject to alteration 232/232 Building Technologies HVAC Products Boiler Sequence Controller RMK770 CE1P3132en 23.04.
