MODEL EM-10 ELECTRIC BOILER CONTROL OPERATION AND INSTRUCTION MANUAL The EM-10 Boiler Temperature Control (BTC) is an efficient boiler operator with a digital LCD display with backlight, a boiler pump output, an alert output, and four stage outputs. The control regulates the boiler based upon setpoint, outdoor reset, and several options for external boiler control.
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 ......
Display Menu Field Displays the current menu Item Field Number Field Displays the current item selected. Displays the current value of the selected item Status Field Displays the current status of the control’s inputs, outputs and operation Buttons Selects Menus, Items and adjusts settings Item Symbol Description BOILER PUMP Displays when the boiler pump is in operation. DEMAND 2 Displays when a call for heat on demand 2 is present. BURNER Displays when stage 1, 2, 3, or 4 contact is on.
Symbol Description 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 4 (Outdoor Reset and Setpoint with Parallel Piping) Mode 4 is designed for outdoor reset and setpoint operation using parallel piping. The heat demand is available to provide outdoor reset for space heating systems. The setpoint can be used to heat an indirect domestic hot water tank. Once a heat demand is present, the control stages the boiler to maintain the calculated outdoor reset target at the boiler outlet sensor.
STAGING MODE (STGMODE) The control can operate up to four stages in order to supply the required target temperature. The method of staging used by the control is either P (proportional) or PID (Proportional & Integral & Derivative), and is selected using the STGMODE item in the Adjust menu. STAGE DELAY (STG DLY) The stage delay is the minimum time between firing first to second stage, second to third stage, and third to fourth stage and is determined by the Stage Delay setting.
Minimum Off Time (MIN OFF) The minimum off time is the minimum amount of time that a stage must be off before it is allowed to turn on. Once a stage turns off, it cannot turn on until a minimum off time elapses. The minimum off time is adjustable through the MIN OFF setting in the Adjust menu. FIRE DELAY (Burner symbol DLY) Does NOT apply to electric boiler operation. The Fire Delay is the delay time that may occur between the time that the control closes the Stage 1 contact and when the burner fires.
BOILER OUTLET MAXIMUM The BOIL OUT MAX setting determines the highest water temperature allowed at the boiler outlet sensor. The boiler stages are immediately shut off once the water temperature exceeds the BOIL OUT MAX setting at the boiler outlet sensor location. BOILER PUMP OPERATION The boiler pump contact operates when: 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.
Outdoor Reset Operation HEAT DEMAND (Dem 1) 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. Once voltage is applied, the control turns on the Dem 1 segment in the display. If the control is not in warm weather shut down (WWSD), the control calculates a boiler target based on the reset ratio and outdoor air temperature.
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. NOTE: Figure shown should be used for checking control only. Boiler wiring diagram should be used for checking the rest of boiler, because interface board has different terminal numbers. Output Connections Boiler Pump Contact The Pump pins are an isolated output in the control.
Outdoor Sensor An optional Outdoor Sensor may be connected to the control. If the sensor is required, connect the two wires from the Outdoor Sensor to the Com (common sensor) and Out (outdoor sensor) pins. The outdoor sensor is used by the control to measure the outdoor air temperature. External Input The control can accept an external input signal from an external control.
Mode 4 and 5 – Outdoor Reset and Setpoint Operation Applications Mode 4 – Outdoor Reset and Setpoint with Parallel Piping Mode 5 – Outdoor Reset and Setpoint with Primary – Secondary Piping Mode 5 Mode 4 BTC Outdoor Sensor BTC Relay Outdoor Sensor Relay Factory Installed Boiler Outlet Sensor Factory Installed Boiler Outlet Sensor Secondary Piping Sensor (Included) Boiler Inlet Sensor (Included) Boiler Inlet Sensor (Optional) The control receives a heat demand provided from zone valve end switch
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 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 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) ADJUST MENU Description 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.
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.
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Technical Data EM-10 Electric Boiler Temperature Control Packaged weight Dimensions Approvals Ambient conditions — — — — — Power supply Pump / Stage 1 Relays Stage 2, 3, 4 Relays Demands Sensors Included: — — — — — — Factory Installed: — 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.
