- Data Brochure D 423 Universal Reset Module 423 1 Information Brochure 2 Application Brochure Choose controls to match application 3 Design your mechanical applications 08/07 Rough-in Wiring 4 Wiring Brochure 5 Wiring and installation of specific control Rough-in wiring instructions Data Brochure Control settings and sequence of operation 6 Job Record Record settings & wiring details for future reference Introduction The Universal Reset Module 423 provides outdoor reset to a hydronic hea
Table of Contents Table of Contents ...........................................................2 Outdoor Reset ...................................................... 18 Display and DIP Switches ..............................................2 Boiler Temperature Control .................................. 21 Dip Switch Settings ................................................2 tekmar Stager Operation ......................................23 Access Level ...................................................
Boiler Sup / Ret Off / DHW Sensor Use the Boiler Sensor Supply / Return DIP switch to select the location of the boiler sensor. Use the Off / DHW Sensor DIP switch when a tekmar sensor is be connected to the 423 in order to operate a DHW storage tank. • If the boiler sensor is located on the supply, this DIP switch should be set to Sup. The 423 is the control that determines the boiler water temperature. Set the boiler’s aquastat at least 20°F (11.0°C) higher than the Boiler Maximum setting.
Display Item Field Menu Field Displays an abbreviated name of the selected item Displays the current menu Status Field Number Field Displays the current status of the control’s inputs, outputs and operation. Most symbols in the status field are only visible when the VIEW Menu is selected Displays the current value of the selected item Symbols Description © 2007 PUMP Displays when the primary pump is in operation. BOILER DEMAND Displays when a Boiler Demand is present.
User Interface Adjusting a Setting Use the User Interface available on the Liquid Crystal Display (LCD) to setup and monitor the operation of the system. Use the four push buttons to the left of the LCD (Menu, Item, Up, Down) to select settings. As you enter settings, record the settings in the Job Record J 423. To adjust a setting 1. Select the appropriate menu using the Menu button. 2. Select the item using the Item button. 3. Use the Up or Down button to make the adjustment.
Display Menus View Menu (1 of 2) The View Menu items display the current operating temperatures and status information of the system. Item Field Range Access Description -67 to 149°F (-55.0 to 65.0°C) InS OUTDOOR SECTION B Current outdoor air temperature as measured by the outdoor sensor. -22 to 266°F (-30.0 to 130.0°C) VIEW MENU – – –, 35 to 230°F (– – –, 1.5 to 110.0°C) -22 to 266°F (-30.0 to 130.0°C) – – –, 35 to 230°F (– – –, 1.5 to 110.0°C) -31 to 266°F (-35.0 to 130.
View Menu (2 of 2) Item Field Range -31 to 266°F (-35.0 to 130.0°C) – – –, 35 to 230°F (– – –, 1.5 to 110.0°C) Access InS Ad Ad Description SECTION B BOILER SUPPLY Current boiler supply water temperature as measured by the boiler sensor. Note: This item is only available when the Boiler Sensor Sup / Ret DIP switch is set to Sup. BOILER TARGET SECTION C The boiler target is the temperature the control is currently trying to maintain at the boiler supply sensor.
Adjust Menu (1 of 7) The Adjust Menu items are the programmable settings used to operate the mechanical equipment. Item Field Range boil, M1 (Mix 1), OFF Default = boil boil, M1 (Mix 1), M2 (Mix 2), OFF Access Description Ad BUS 1 SECTION C Select the water temperature for tN4 Bus 1. Ad Default = boil boil, M1 (Mix 1), M3 (Mix 3), OFF Ad ADJUST MENU Default = boil -60 to 45°F (-51.0 to 7.0°C) Default = 10°F (-12.
Adjust Menu (2 of 7) Item Field Range OFF, 40 to 150°F (OFF, 4.5 to 65.5°C) Access Ad Description SECTION G MIX 1 MINIMUM The minimum allowed Mix 1 target temperature. Default = OFF Note: This item is only available when Bus 1 is set to Mix 1. 80 to 220°F, OFF (26.5 to 104.5°C, OFF) MIX 1 MAXIMUM SECTION G The maximum allowed Mix 1 target temperature. Default = 140°F (60.
Adjust Menu (3 of 7) Item Field Range 30 to 230 seconds Default = 105 1 HRF1 2 HRF2 3 Fancoil 4 Fin-tube Convector 5 Radiator 6 Baseboard Default = 1 40 to 100°F (4.5 to 38.0°C) Access MIX 2 MOTOR SECTION G The time that the Mix 2 actuating motor requires to operate from fully closed to fully open. Ad InS Ad Ad ADJUST MENU Default = 70°F (21.0°C) 70 to 220°F (21.0 to 104.5°C) Default = 120°F (49.0°C) OFF, 40 to 150°F (OFF, 4.5 to 65.
Adjust Menu (4 of 7) Item Field Range Au (Auto) OFF Default = Au 1 HRF1 2 HRF2 3 Fancoil 4 Fin-tube Convector 5 Radiator 6 Baseboard Access InS Ad InS Ad Default = 4 40 to 100°F (4.5 to 38.0°C) Default = 70°F (21.0°C) ADJUST MENU 70 to 220°F (21.0 to 104.5°C) Default = 180°F (82.0°C) OFF, 80 to 180°F (OFF, 26.5 to 82.0°C) Default = 140°F (60.0°C) 90 to 225°F, OFF (32.0 to 107.0°C, OFF) Default = 200°F (93.5°C) Au (Auto), 2 to 42°F (Au, 1 to 23.
Adjust Menu (5 of 7) Item Field Range 0:00 to 3:00 min Default = 0:10 min 10 to 230 seconds Default = 30 seconds Access Description Ad BOILER FIRE DELAY SECTION C The time delay the control can expect between the relay contact closes to fire the boiler and when the burner actually fires. Note: This item is only available when the Boiler Sensor Sup / Ret DIP switch is set to Sup, and the tekmar stager DIP switch is set to OFF.
Adjust Menu (6 of 7) Item Field Range OFF, 70 to 190°F (OFF, 21.0 to 87.5°C) Access DHW (UnOccupied) SECTION H The temperature of the DHW tank during the Sleep and Unoccupied periods. Ad Default = OFF 1 to 42°F (0.5 to 23.5°C) ADJUST MENU Default = 180°F (82.0°C) OFF, On Default = OFF OFF, 1 (parallel, no priority) 2 (parallel, priority) 3 (pri-sec, no priority) 4 (pri-sec, priority) Ad Ad Ad Ad Default = 1 60 to 220°F (15.5 to 104.5°C) Default = 180°F (82.
Adjust Menu (7 of 7) Item Field Range OFF, On ADJUST MENU Default = OFF 40 to 100°F, OFF (4.5 to 38.0°C, OFF) Default = 70°F (21.0°C) 40 to 100°F, OFF (4.5 to 38.0°C, OFF) Access Description Ad SETPOINT (UnOccupied) SECTION J Selects whether or not a Setpoint Demand will be responded to during the Sleep and Unoccupied periods. Note: This item is only available when Setpoint Mode is set 1 through 4 and the Schedule Setting is set to Member 1, 2, 3 or 4. InS Ad Ad Default = 60°F (15.
Misc (Miscellaneous) Menu (1 of 1) The Miscellaneous Menu Items set control and display options such as access level and temperature units. Item Field Range InS (Installer) Ad (Advanced) InS °F, °C InS Default = °F Ad 0 to 24 MISC MENU Access 0 to 24 Ad Ad Ad Description ACCESS LEVEL The access level of the control. The access column shows which items are visible in each access level. Note: This item is only available when the Lock / Unlock DIP switch is set to Unlock.
Testing the Control IF Bus 3 is set to M3 (Mix 3): The control has a built-in test routine that tests the main control functions. The control continually monitors the sensors and displays an error message whenever a fault is found. The individual outputs and relays are tested using a test sequence. Test Sequence Step 7 The Mix 3 device ramps up to 100% over 10 seconds or according to the motor speed setting.
Max Heat Zone Test The control has a function called Max Heat. In this mode, the control turns on and operates the system up to the maximum set temperatures as long as there is a demand for heat. tN4 thermostats operate to meet the occupied setting +5°F (3°C). The control operates in this mode for up to 24 hours or until the Test button is pressed. Use this mode to run the circulators during system start-up to purge air from the piping.
Sequence of Operation tekmarNet®4 Communication Section A tekmarNet®4 (tN4) communicates between tN4 devices (thermostats, Reset Module and Expansion Modules). Each tN4 device is connected to a tN4 communication bus using two wires. Each tN4 bus adjusts a single water temperature in the system using indoor temperature feedback. The Universal Reset Module 423 allows for four tN4 buses. This allows you to control a system with up to four separate water temperatures.
Terminal Unit There is a terminal unit setting for each tN4 bus. The Terminal Unit setting is found in the Adjust Menu. Hydronic Radiant Floor (1) Terminal type 1 is a heavy, or high mass, hydronic radiant floor system. This type of a hydronic radiant floor is embedded in either a thick concrete or gypsum pour. This heating system has a large thermal mass and is slow acting. Hydronic Radiant Floor (2) Terminal type 2 is a light, or low mass, hydronic radiant floor system.
Boiler Outdoor Reset Mix 1, Mix 2 and Mix 3 Outdoor Reset There is a water temperature and therefore a characterized heating curve for each communication bus. When using boiler temperature water to heat zones, the installer will be required to set a boiler characterized heating curve. Each tN4 communication bus operates on a separate water temperature. Therefore a separate characterized heating curve is required for Mix 1, Mix 2 and Mix 3.
Boiler Temperature Control Section C The 423 is able to operate up to two on-off or modulating boiler as a heat source. For proper operation of the boilers, the 423 must be the only control that determines when the boilers are to fire. In this case, the boiler sensor should be located on the boiler supply pipe and the Boiler Sensor DIP switch is set to Supply.
Boiler Fire Delay The Boiler Fire Delay is the time delay that occurs between the time that the control closes the boiler contact to fire the boiler and when the burner fires. • Locate the Boiler Fire Delay setting in the Adjust Menu. Auto Differential In order to decrease temperature swings and increase boiler efficiency, the Auto Differential feature automatically changes the on / off differential of the boiler based on the heating load.
Boiler Motor Speed The Boiler Motor Speed is the amount of time the boiler requires to go from 0% modulation to 100% modulation. Gas valve actuating motors have a design time from fully closed to fully open which can be found in the manufacturer’s manual. The Boiler Motor Speed should be set to this time. The Boiler Motor Speed setting for a Variable Frequency Drive (VFD) is the amount of time required to go from a stopped position to 100% fan speed.
Boiler Enable and Setpoint Enable Section E If the 423 is one of many controls that can call for heat to a single boiler or there is a boiler sequencer other than a tekmar Stager (Boiler Control 264, 265, 268), operating multiple boilers or multiple stages, then the boiler sensor must be located on the return pipe of the boiler(s). When the boiler sensor is located on the boiler return, the control is able to provide boiler return protection through the use of the Mixing Expansion Modules.
Floating Action The control pulses the actuator motor open or close to maintain the correct supply water temperature at the mix supply sensor when there is a requirement for mixing. The mixing valve that the actuator is connected to can be either a 2-way, 3-way or 4-way valve. A visual indication as to whether the control is currently opening or closing the mixing valve is displayed in the LCD with the words OPN and CLS while viewing the Mix Supply or Mix Target temperatures.
DHW During UnOccupied When using a Powered DHW Demand, the control has a DHW Exchange UnOccupied setting that allows the installer to select On or Off. When set to On, and the control receives a DHW Demand during an UnOccupied or Sleep period, the control continues operation of the DHW system as it would during the Occupied and Wake periods. When set to Off, the control can ignore a DHW Demand for the duration of the UnOccupied and Sleep periods.
DHW Priority Override DHW Post Purge DHW Priority Override applies to DHW MODE 2 and 4. To prevent the building from cooling off too much or the possibility of a potential freeze up during DHW priority, the control limits the amount of time for DHW priority. As the outdoor air temperature becomes colder, the length of time that the control provides DHW priority is reduced. Once the allowed time for priority has elapsed, the control overrides the DHW priority and resumes space heating.
Setpoint Temperature Operation Section J Setpoint The control can operate to satisfy the requirements of a setpoint load in addition to a space heating load and a DHW load. A setpoint load overrides the current outdoor reset temperature and WWSD setting in order to provide heat to the setpoint load. Setpoint Demand A Setpoint Demand is required in order for the control to provide heat to a setpoint load.
Setpoint Priority Override Conditional Setpoint Priority Setpoint Priority Override applies to SETPOINT MODE 2 and MODE 4. To prevent the building from cooling off too much or the possibility of a potential freeze up during setpoint priority, the control limits the amount of time for setpoint priority. As the outdoor air temperature becomes colder, the length of time the control provides setpoint priority is reduced.
Error Messages Local Errors and Device Errors Error messages are used to indicate a problem somewhere in the system. There are two types of error messages: Local Errors and Device Errors. A Local Error indicates an error specific to a device. For example, a thermostat with a sensor short circuit will show a Sensor Short Error on its display. No other devices will show this specific error (unless they also have a sensor short circuit).
Error Messages (1 of 5) Error Message Description ADJUST ERROR The control failed to read the Adjust Menu settings, and reloaded the factory default settings. Operation stops until you check all the Adjust Menu settings. Note: To clear the error, the access level must be set to Advanced and the settings in the Adjust menu must be checked. MISCELLANEOUS ERROR The control failed to read the Miscellaneous Menu settings, and reloaded the factory default settings.
Error Messages (2 of 5) Error Message Description BUS 2 DEVICE LOST Communication is lost to a tN4 device on Bus 2. The number shown is the address of the lost device. The LCD on the lost device displays Bus Boil OPn. Ensure that there is power to the lost device. Trace the wires from the control to the lost device looking for loose or damaged wires. The error message self clears when the error condition is corrected.
Error Messages (3 of 5) Error Message Description MIXING EXPANSION MODULE CONFLICT A Mixing Expansion Module is connected to the Boiler bus. The Mixing Expansion Module must be removed from the Boiler bus, or the bus must be changed to Mix 1, Mix 2, or Mix 3 in order to clear the error message. The error message self clears once the error condition is corrected. MIX 1 SENSOR SHORT CIRCUIT Due to a short circuit, the control failed to read the Mix 1 supply sensor.
Error Messages (4 of 5) Error Message Description BOILER SENSOR OPEN CIRCUIT Due to an open circuit, the control failed to read the boiler sensor. The control no longer controls the boiler. Instead, the control provides a boiler enable to the boiler’s aquastat or boiler control until the sensor is repaired. The control will not operate the boiler contact if the Boil Minimum setting is less than 100°F (38.0°C). Locate and repair the problem as described in the Data Brochure D 070.
Error Messages (5 of 5) Error Message Description tekmar STAGER SETTING CONFLICT There is a DIP switch settings conflict. The tekmar Stager DIP switch is set to On and the Boiler Sensor DIP switch is set to Ret. Once the Boiler Sensor DIP switch is set to Sup or the tekmar Stager DIP switch is set to Off, the error message clears. DEVICE ERROR AT ADDRESS #:## #:## is the address of the device with the error. The bus number displays before the colon, and the device number displays after.
Limited Warranty and Product Return Procedure Limited Warranty The liability of tekmar under this warranty is limited. The Purchaser, by taking receipt of any tekmar product (“Product”), acknowledges the terms of the Limited Warranty in effect at the time of such Product sale and acknowledges that it has read and understands same.
