OPERATION & SERVICE
SINGLE AND THREE PHASE POWER
The water heaters covered in this manual can be field converted for a single or three phase power supply - see pages 15 and 16. These water heaters can be factory ordered for standard North American power supplies; 277/208/240/480 volt models. 277 volt models are single phase only. Voltage conversion kits with instructions are available from the manufacturer - voltage conversions are not covered in this manual. Verifying the power supply is adequate is typical first step during most service diagnostic procedures. The illustrations and instructions that follow outline how this is done using a standard AC volt meter - see Tools Required on page 3.
Service Warning: Never touch any wiring inside the water heater until the main power supply to the water heater has been secured. Secure power to the water heater by turning off the power supply breaker and/or disconnect switch AND verify with a volt meter that all wiring has no voltage present before touching any wiring inside the water heater’s control panel.
Service Warning: Zero or low voltage readings between internal wiring and/or Power Distribution Block terminals and ground can be due to an inadequate earth ground. TREAT ALL WIRES AS BEING HOT until it has been determined there is no voltage present.
L1 L2 L3
Power Distribution Block
(see Figures 1 & 2 on pages 8 and 9)
277 Volt 1Ø Power | 208/240/480 Volt 1Ø Power |
208/240/480 Volt 3Ø Power
Servicing should only be performed by a Qualified Service Agent
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