BT Series Electric Boilers – Installation, Operating and Maintenance Instructions
9
Transformer:
Power Rating: 40 VA
Input Voltage: 120 Vac, 60 Hz, single phase
Output Voltage: 24 Vac, 60 Hz
Power Output:
1. Three 24 Vac, 3 AMP relays drive stage 1, stage 2 and stage 3. Maximum load of the
individual drive or the total load of three relays should not exceed 1.33 A or 32 VA.
2. One 120 Vac pump output is switched by using a 10A relay. The load current of this output is
also limited by the pump fuse selected (controller supplied with 3 A fuse) and must not
exceed 5 A or 600 VA.
Power Consumption:
Controller (internal): 4 watts maximum
24 Vac contactor drive: depends on the contactors
LED Displays:
A total of seven indicator lights display the following information:
1. Hi-limit (red): High-limit or high-limit sensor error. LED is lit when either the boiler water
temperature reaches the high-limit of 230°F or the high-limit sensor is
faulty, disconnected or misconnected.
2. Sensor (red): Operating sensor error. LED is lit when operating sensor is faulty,
disconnected or misconnected.
3. Power (green): Power on/off.
4. Pump (yellow): Pump relay on/off.
5. Stage 1 (yellow): Boiler first stage on/off (low heat).
6. Stage 2 (yellow): Boiler second stage on/off (medium heat).
7. Stage 3 (yellow): Boiler third stage on/off (high heat).
Signal/Control Input:
T1 and T2: Thermostat or zone valve end switch, switching input, closed is activation.
HL: High-limit temperature sensor.
CL: Common return of the high-limit and the operating temperature sensors.
OL: Operating temperature sensor.
Temperature Control Ranges:
Temperature notation: degrees Fahrenheit
Pre-set operating temperature range: 100°F to 210°F
Fixed high-limit temperature: 230°F
All stages on/off temperature differential: ±4°F
Operating Temperature Adjustment:
Internal temperature potentiometer on the controller or external temperature potentiometer
(optional extra).
Anti-Cycle Cube (external):
Delay "On Make" Time Range: 0.1 to 8 minutes (adjustable)
Input Voltage: 24 V
Maximum Load Current: 1 Amp
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