OPERATION & SERVICE
Servicing should only be performed by a Qualified Service Agent
12
SINGLE AND THREE PHASE POWER
These water heaters can be factory ordered for standard: 277/208/240/480 volt power. 277
volt models are single phase only - other voltages may be single or three phase.
Field Conversions
Some water heaters may be converted for single or three phase power within the guidelines
listed below. Follow the phase conversion instructions provided in the Instruction manual
that came with the water heater. Voltage/KW conversions ARE NOT permitted.
• 208/240 VAC models factory configured 24KW or less are convertible as single or three phase and
include jumpers to make the conversion.
• 208/240 VAC models factory configured as single phase with over 24KW can be converted to three
phase but jumpers are not provided.
• 208/240 VAC models factory configured as three phase with over 24KW cannot be converted to
single phase.
• No 480 VAC models are phase convertible.
• Heating element voltage and KW conversions are not permitted on any models.
Verifying the power supply is correct is typical first step during most service procedures. The
illustrations and instructions on the following pages will outline how this is done.
277 Volt 1Ø Power
208/240/480 Volt 1Ø Power
208/240/480 Volt 3Ø Power
Power Distribution Block
Models with more than one heating element only.
See Figures 1 & 2 on pages 8 and 9.
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