Thermostat Removal And Replacement (Contactor Models); Mce-Xii - Bradford White MII Series Service Manual

Immersion Thermostat Removal & Replacement
1. STOP, DANGER! Turn power "OFF" to water heater.
2. Turn off cold water supply to heater. Connect hose to drain
spigot of water heater and route to an open drain. Open
a nearby hot water faucet to vent heater for draining. Open
drain spigot of water heater and allow heater to drain
to a point below the Immersion bulb location
(see illustration 16 ).
3. Close drain spigot and remove hose.
4. Remove lower control box cover and insulation.
5. Locate thermostat inside lower control box mounted to
the right side of the box, below the ECO control
(see illustration 16).
6. Follow copper capillary tube from thermostat to the
immersion bulb location and remove immersion bulb
from tank, 11/16 wrench.
7. Remove (pull) thermostat control dial from stem of
thermostat.
8. Remove the two thermostat mounting screw screws
located under thermostat dial (see illustration 16).
9. Once thermostat is removed, disconnect
wire leads to the thermostat. NOTE: It may be
necessary to identify wires for proper reconnection to
new thermostat.
10. Refer to wiring diagram located on the inside of the
upper control box cover and properly reconnect wire
leads to new thermostat and remount control inside
control box using screws from step 8.
11. Replace control dial to stem of thermostat.
12. Loosen ferrule nut of immersion bulb.
(see illustration 17)
Immersion
bulb
13. Position tank nut at end of immersion bulb as shown in illustration 17. Insert immersion bulb into tank and tighten
tank nut.
14. Gently pull copper capillary tube to insure the immersion bulb is in a horizontal position as shown in illustration 17
and tighten ferrule nut.
15. Resume water supply, fill tank and check for leaks.
16. Be sure tank is full or water and resume power supply to water heater. Verify proper thermostat operation.
Immersion
Thermostat Bulb
Copper Capillary
Immersion
Thermostat
Ferrule
nut
capillary
Tank
nut
Illustration 17
Page 27
SERVICE PROCEDURE MCE-XII
Thermostat Removal and Replacement
DANGER
High voltage exposure. To avoid hazard to
Life or property, be sure power is turned
OFF to water heater while performing this
procedure.
Location
Tube
control
Illustration 16
Copper
tube
ECO
Control
Thermostat control
Mounting Screws
Located Under
Thermostat Dial
27