American Water Heater 52 Series Instruction Manual page 17

CONVERSION TO SINGLE PHASE
When the heater is shipped for connection to a three-phase
electrical service, it may be connected to a single-phase electrical
service of the same voltage by:
1. Disconnect blue wires and yellow wires from terminal L3.
2. Reconnect all blue wires to terminal L1 (with black wires).
3. Reconnect all yellow wires to terminal L2 (with red wires).
4. Connect incoming power to terminals L1 and L2.
WIRING DIAGRAMS
Figure 10. Nine-Element Single- and Three-Phase Power Circuits
CONVERSION TO THREE PHASE
When heater is shipped for connection to a single-phase electrical
service, it may be connected to a three-phase electrical service
of the same voltage by:
1. Disconnect blue wires from terminal L1.
2. Disconnect yellow wires from terminal L2.
3. Reconnect all blue wires and yellow wires to terminal L3.
4. Connect incoming power to terminals L1, L2, and L3.
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