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OPERATION & SERVICE
Servicing should only be performed by a Qualified Service Agent
12
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.
277 Volt 1Ø Power
208/240/480 Volt 1Ø Power
Power Distribution Block
(see Figures 1 & 2 on pages 8 and 9)
L1 L2 L3
208/240/480 Volt 3Ø Power