MODEL EM-10 MONITRON II ELECTRIC BOILER CONTROL SERVICE MANUAL Publication No. EM-40-SM Printed in U.S.A. 1208 Part No.
How to Use the Data Brochure This brochure is organized into three main sections. They are: 1) Sequence of Operation, 2) Installation, and 3) Control Settings. The Control Settings section of this brochure describes the various items that are adjusted and displayed by the control. The control functions of each adjustable item are described in the Sequence of Operation. Table of Contents User Interface ..................................................................2 Display and Symbol Description ......
Item Item Display Item Menu Field Displays the current menu Menu Field Displays Field the Number Item Field Displays the current item selected. currentthe menu Displays current value of the selected item Item Field Number Field Status Field Displays the current value Displays the current item selected.
Section A: General POWERING UP THE CONTROL When the control is powered up, the control turns on all segments in the display for 2 seconds. Next, the software version is displayed for 2 seconds. Last, the control enters into the normal operating mode. DISPLAY BACKLIGHT The control’s display has a backlight that is permanently on while the control is powered. PIPING The boiler can be piped in parallel or in primary/secondary to the system.
MODE 3 (Dedicated Domestic Hot Water Tank) Mode 3 is designed for heating a dedicated domestic hot water tank using parallel piping. A tank sensor creates an internal heat demand in the control. Once an internal heat demand is present, the control stages the boiler to maintain the boiler target temperature at the boiler outlet sensor. Refer to section C for a description of dedicated domestic hot water tank operation.
Boiler Outlet Sensor Boiler Outlet Sensor MODE 7 (External Target Temperature Input and Setpoint with Primary/Secondary Piping) Boiler Mode 7 is designed for an external input signal and Supply external input setpoint with primary/secondary piping. The Sensor signal can be provided from a BMS, an EMS, or a tekmar Boilerfor Inlet Sensorheating. Boiler Inlet Sensor can be tN4 System Control space The setpoint used to heat an indirect domestic hot water tank.
EM-40-SM Service Manual D Differential BOILER DIFFERENTIAL (DIFF) A heat source must be operated with a differential in order to Fixed Differential reduce short cycling. The boiler differential is divided around the boiler target temperature.
Increasing Temperature OFF Load Differential Des ired Desired Temperature Temperature BOILER MINIMUM (BOIL MIN) ON ON temperature that The BOIL MIN setting is the lowest water the control is allowed to use as a boiler target temperature. Increasing Time During mild conditions, if the control calculates a boiler target temperature that is below the BOIL MIN setting, the boiler target temperature is adjusted to at least the BOIL MIN setting.
Section B: Setpoint Operation A setpoint is a fixed water temperature target that the boiler is to maintain at the operation sensor once a demand is present. The boiler maintains the boiler target by operating the stages using proportional or PID logic together with the boiler differential. Setpoint Operation + 1/2 Differential Setpoint Target - 1/2 Differential Mode 1 or 2 and Heat Demand (Dem 1) A heat demand is required whenever heat is required for the DHWAOperation primaryDedicated heating load.
Setpoint Operation A Minimum On Time B Minimum Off Time + 1/2 Differential C Interstage On Delay D Interstage Off Delay Setpoint Target Section D: Outdoor Reset Operation B C - 1/2 Differential D Differential Increasing Temperature ON ON HEAT DEMAND (Dem 1) Increasing Time A heat demand is required whenever heat is required in the system. A heat demand is generated when a voltage between 24 and 120 V (ac) is applied across the CD (common demand) and the Ht D (heat demand) pins.
A 0-20 mA signal can be converted to a 0-10 V (dc) signal A 0-20 mA signal canOhm be converted to the a 0-10 V (dc) signal installing a 500 resistor on external input signal by by installing a 500 Ohm resistor on the external input signal device’s terminals. device’s terminals.
20 10 210°F (99°C) *requires a 500 ? resistor Installation Electrical Connections to the Control The installer should test to confirm that no voltage is present at any of the wires during installation. The control includes a 24 pin connector for ease of installation.
DHW Tank Sensor An optional DHW Tank Sensor may be connected to the control. If the sensor is required, connect the two wires from the sensor to the Com (common sensor) and Sys/D (DHW) pins. External Input The control can accept an external input signal from an external control. If an external input signal is required, connect the positive 0-10 V (dc) wire to the +V(in) pin and connect the negative 0-10 V (dc) wire to the Com/- pin.
18 13,474 -5 -21 100,221 65 -35 -37 280,279 35 2 29,996 0 -18 85,362 70 21 11,883 -30 -34 234,196 40 4 26,099 5 -15 72,918 75 24 10,501 -32 196,358 7 22,763 -25 45 TEST SUPPLY 80 27 9,299 10THE POWER -12 62,465 -29 165,180 10 19,900 -20 50 wires wires Make -9 53,658are not in85contact29with other 15sure exposed 8,250 -15 -26 139,402 55 13 measure 17,436 or grounded surfaces. Turn on the power and the -10between -23 the C 118,018 60 an AC 16 voltmeter, 15,311 and R pins using the voltage 13,474 65V (ac).
Control Settings DIP Switch Settings Note: DIP switches are located on the front of the control. Mode 1 (A) Factory / Installer BTC The Factory / Installer DIP switch is used to select which items are available to be viewed and / or adjusted in the Factory Access Level includes all user interface. The Relay the settings available in the control. The Installer Access Level includes the settings and items which are required for system setup.
Mode 1 and 2 – Two Setpoint Operation - View Menu View Next Item The View menu items display current operating temperatures and system status information. Use the Item button to view items in this menu.
Mode 1 and 2 – Two Setpoint Operation - Adjust Menu (1 of 2) Enter Adjust Menu Next Item Item Change Value Item ADJUST MENU Item Field The Program menu items are the programmable settings used to operate the system. Press and hold all three buttons simultaneously to enter the Program menu. Range Description Access 1 to 8 MODE Select the operating mode for the control. Factory PId or P STAGE MODE Select the staging operation to be either automatic or manual.
Mode 1 and 2 – Two Setpoint Operation - Adjust Menu (2 of 2) ADJUST MENU Item Field Range Description Access Au, 0:30 to 9:55 min STAGE DELAY Select the minimum time delay between stages. Note: This setting is only available when STAGE MODE is set to PId. Au, 2 to 42°F (1 to 23°C) DIFFERENTIAL Select the boiler differential. Note: The automatic setting is only available when STAGE MODE is set to PId staging.
Mode 3 – Dedicated Domestic Hot Water Tank with Parallel Piping Application Mode 3 BTC Mode 3 - Dedicated DHW with Parallel Piping The control measures the tank temperature using a DHW sensor. Once the tank temperature falls the tank differential below the tank setpoint, an internal heat demand is created. The boiler pump is turned on and the boiler is operated to maintain the tank target temperature.
Mode 3 – Dedicated DHW with Parallel Piping - Adjust Menu (1 of 2) Enter Adjust Menu Next Item Item Change Value Item ADJUST MENU Item Field The Program menu items are the programmable settings used to operate the system. Press and hold all three buttons simultaneously to enter the Program menu. Range Description Access 1 to 8 MODE Select the operating mode for the control. Factory PId or P STAGE MODE Select the staging operation to be either automatic or manual.
Mode 3 – Dedicated DHW with Parallel Piping - Adjust Menu (2 of 2) Item Field Range Description Au, 0:30 to 9:55 min STAGE DELAY Select the minimum time delay between stages. Note: This setting is only available when STAGE MODE is set to PId. 0 to 10°F (0 to 6°C) STAGE DIFFERENTIAL Select the interstage temperature differential between stages for proportional staging. Note: This setting is only available when STAGE MODE is set to P.
Mode 4 and 5 – Outdoor Reset and Setpoint Operation Applications Mode 4 – Outdoor Reset and Setpoint with Parallel Piping Mode Mode 44 Mode 5 – Outdoor Reset and Setpoint with Primary – Secondary Piping Mode Mode 55 BTC BTC Outdoor Outdoor Sensor Sensor BTC BTC Relay Relay Boiler Boiler Outlet Outlet Sensor Sensor Outdoor Outdoor Sensor Sensor Relay Relay Boiler Boiler Outlet Outlet Sensor Sensor Boiler Boiler Supply Supply Sensor Sensor Boiler Boiler Inlet Inlet Sensor Sensor Boiler Boiler Inlet
Mode 4 and 5 – Outdoor Reset and Setpoint Operation - View Menu View Next Item The View menu items display current operating temperatures and system status information. Use the Item button to view items in this menu. Item Ite m F ie ld R ang e (-51 to 88°C) OUTDOOR Current outdoor air temperature as measured by the outdoor sensor.
Mode 4 and 5 – Outdoor Reset and Setpoint Operation - Adjust Menu (1 of 3) Enter Adjust Menu Next Item Item Change Value Item ADJUST MENU Item Field The Program menu items are the programmable settings used to operate the system. Press and hold all three buttons simultaneously to enter the Program menu Range Description Access 1 to 8 MODE Select the operating mode for the control. PId or P STAGE MODE Select the staging operation to be either automatic or manual.
Mode 4 and 5 – Outdoor Reset and Setpoint Operation - Adjust Menu (2 of 3) Item Field Range Description Access 120 to 225°F (49 to 107°C), OFF BOILER MAXIMUM Select the maximum boiler target temperature. Factory OFF, 80 to 180°F (27 to 82°C) BOILER MINIMUM Select the minimum boiler target temperature. Factory 0:00 to 3:00 min (1 second increments) FIRE DELAY Select the amount of time required for combustion pre-purging, ignition and the flame to be established.
Mode 4 and 5 – Outdoor Reset and Setpoint Operation - Adjust Menu (3 of 3) ADJUST MENU Item Field Range Description Access 0:10 to 5:00 min MINIMUM ON TIME Select the minimum amount of time that the stage contact must remain on before it is allowed to turn off. Note: This setting is only available when STAGE MODE is set to P. Factory 0:10 to 5:00 min MINIMUM OFF TIME Select the minimum amount of time that the stage contact must remain off before it is allowed to turn back on.
Mode 6 and 7 – External Target Temperature Input and Setpoint Operation Applications Mode 6 – External Target Temperature Input and Setpoint with Parallel Piping Mode66 Mode EMS EMS BTC BTC Mode 7 – External Target Temperature Input and Setpoint with Primary – Secondary Piping Mode77 Mode BTC BTC 0-10VV(dc) (dc) 0-10 0-10VV(dc) (dc) 0-10 Relay Relay tN4System System tN4 Control Control Relay Relay Boiler Boiler Outlet Outlet Sensor Sensor Boiler Boiler Outlet Outlet Sensor Sensor BoilerInlet InletSe
Mode 6 and 7 – External Target Temperature Input and Setpoint Operation - View Menu View Next Item The View menu items display current operating temperatures and system status information. Use the Item button to view items in this menu.
Mode 6 and 7 – External Target Temperature Input and Setpoint Operation - Adjust Menu (1 of 2) Enter Adjust Menu Next Item Item Change Value Item ADJUST MENU Item Field The Program menu items are the programmable settings used to operate the system. Press and hold all three buttons simultaneously to enter the Program menu. Range Description 1 to 8 MODE Select the operating mode for the control. PId or P STAGE MODE Select the staging operation to be either automatic or manual.
Mode 6 and 7 – External Target Temperature Input and Setpoint Operation - Adjust Menu (2 of 2) ADJUST MENU Item Field Range Description Access 0 to 10°F (0 to 6°C) STAGE DIFFERENTIAL Select the interstage temperature differential between stages for proportional staging. Note: This setting is only available when STAGE MODE is set to P. Factory 0:10 to 8:00 min INTERSTAGE ON DELAY Select the amount of time that must pass once a stage has been turned on in order to allow the next stage to turn on.
Mode 8 External 0-10 V (dc) Mode 8 – External Direct Drive Operation Control Direct Drive BTC BTC Application Boiler Boiler – ExternalOutlet Direct Drive Operation Mode 8Outlet Sensor Sensor The control receives a heat demand provided via an external analog input signal from a tekmar sequencing control (such as a 275). The control turns on the boiler Boiler Supply pump and the Stage 1, 2, 3 and 4 Sensor contacts according to the external input signal.
Mode 8 – External DirectDrive Operation - Adjust Menu Enter Adjust Menu Item Next Item Change Value Item Item Field Range ADJUST MENU 1 to 8 The Program menu items are the programmable settings used to operate the system. Press and hold all three buttons simultaneously to enter the Program menu. Description MODE Select the operating mode for the control. Access Setting Factory Installer 120 to 225°F (49 to 107°C) BOILER OUTLET MAXIMUM Select the maximum boiler outlet temperature.
Error Messages (1 of 2) E01 The control was unable to read a piece of information from its EEPROM memory. The control will stop operation until all settings in the Adjust menu have been checked by the user or installer. To clear the error message, set Access Level DIP Switch A to Factory (on position), then check all Adjust menu items. BOILER OUTLET SENSOR SHORT CIRCUIT The control is no longer able to read the boiler outlet sensor due to a short circuit.
Error Messages (2 of 2) OUTDOOR SENSOR OPEN CIRCUIT The control is no longer able to read the outdoor sensor due to an open circuit. In this case the control assumes an outdoor temperature of 32°F (0°C) and continues operation. Test the outdoor sensor and related wiring. The error message will clear once the error condition is corrected and a button is pressed. DHW TANK SENSOR SHORT CIRCUIT The control is no longer able to read the DHW tank sensor due to a short circuit.
EM-40-SM Service Manual 35
Technical Data EM-10 (Monitron II) Electric Boiler Temperature Control Packaged weight Dimensions Approvals Ambient conditions Power supply Pump / Stage 1 Relays Stage 2, 3, 4 Relays Demands Sensors included: optional: — — — — — 0.38 lb. (170 g) Enclosure D, black noryl plastic 4-3/4” H x 2-7/8” W x 1-7/8” D (120 x 74 x 48 mm) ANSI Z21.23, CAN 1-6.
