Line Voltage Testing........................................................................ 16 Mce-Ii - Bradford White MII Series Service Manual

Line Voltage Testing
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
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.
Three Phase Line Voltage Testing
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.
16
SERVICE PROCEDURE MCE-II
High voltage exposure. To avoid hazard to
life or property use extreme caution when
making voltage checks .
Line voltage from
service panel
connected to Terminal block
of heater
Check voltage across
top terminals.
Line voltage from
service panel
connected to Terminal block
of heater
Check voltage across
top terminals.
Page 16
Line Voltage Testing
DANGER
Line voltage from
service panel
OR
connected to Fuse block
of heater
Illustration 3
Line voltage from
service panel
OR
connected to Fuse block
of heater
Illustration 4