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SERVICE PROCEDURE MCE-II
Line Voltage Testing
Page 16
Line Voltage Testing
Illustration 3
1. STOP, DANGER! Turn power “OFF” to water heater.
2. Open upper 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. 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 illustration 3).
A) Rated voltage IS present, power to
the water heater is okay.
B) Rated voltage NOT present, Check
service panel.
Line voltage (single phase or three phase) will
connect to a terminal block or directly to a fuse block
located inside control panel.
Determine heaters 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
Line voltage from
service panel
c
onnected to Terminal block
o
f heater
L
ine voltage from
service panel
connected to Fuse block
of heater
OR
Check voltage across
top terminals.
1. STOP, DANGER! Turn power “OFF” to water heater.
2. Open upper 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. 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 illustration 4).
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
Line voltage from
service panel
connected to Terminal block
of heater
Line voltage from
service panel
connected to Fuse block
of heater
OR
Check voltage across
top terminals.
Illustration 4
DANGER
High voltage exposure. To avoid hazard to
life or property use extreme caution when
making voltage checks .
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