Service Procedure Vii: Thermostat Removal And Replacement - Bradford White ElectriFLEX HD CEHD 50 Service Manual

Thermostat Removal and Replacement
Thermostat Control Continuity Testing
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
12).
3. Close drain spigot and remove hose.
4. Open control box door or remove lower panel and insulation.
5. Locate thermostat inside control box mounted to the right
side of the box (see illustration12).
6. Follow copper capillary tube from thermostat to the
immersion bulb location and remove immersion bulb from
tank using 11/16 wrench.
7. Remove (pull) thermostat control dial from stem of
thermostat.
8. Remove the two thermostat mounting screws located under
thermostat dial (see illustration 12).
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 control
panel door 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 13).
13. Position tank nut at end of immersion bulb as shown in illustration 13. 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 13 and
tighten ferrule nut.
15. Resume water supply, fill tank and check for leaks.
16. Be sure tank is full of water and resume power supply to water heater. Verify proper thermostat operation.
Service Procedure VII:
WARNING
High voltage exposure. Use caution when making
voltage checks to avoid hazard to life or property.
19
19