Service Manual

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Line Voltage Testing
Line voltage (single phase or three phase) will connect
to a terminal block or directly to a fuse block located
inside the control panel.
Determine the heater’s voltage and phase by referring to
the rating plate located on the front of the heater. Apply
the appropriate phase procedure below to determine if
proper line voltage is present.
Single Phase Line Voltage Testing
1. STOP, DANGER! Turn power “OFF” to water
heater.
2. Open control panel door.
3. Determine connection point for line voltage from
service panel, terminal block, or fuse block.
4. Set multi-meter to “volts AC” setting. Be sure to
scale meter for appropriate voltage.
5. Use caution and turn power “ON” to water heater.
6. Use caution and check voltage across top
terminals where service voltage connects to water
heater (see Figure 3).
A) Rated voltage IS present, power to the water
heater is okay.
B) Rated voltage NOT present, check service
panel.
Three Phase Line Voltage Testing
1. STOP, DANGER! Turn power “OFF” to water
heater.
2. Open control panel door.
3. Determine connection point for line voltage from
service panel, terminal block, or fuse block.
4. Set multi-meter to “volts AC” setting. Be sure to
scale meter for appropriate voltage.
5. Use caution and turn power “ON” to water heater.
6. Use caution and check voltage across top
terminals where service voltage connects to water
heater (see Figure 4).
A) Rated voltage IS present, power to the water
heater is okay.
B) Rated voltage NOT present, Check service
panel.
Figure 3
Figure 4
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