Service Manual

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Immersion Thermostat Removal
1. STOP, DANGER! Turn power “OFF” to water
heater.
2. Open control box door.
3. 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 Figure 10 for location).
4. Close drain spigot and remove hose.
5. Locate thermostat control inside lower control box
mounted to the right inside surface of the control
box (see Figure 10).
6. Follow copper capillary tube from thermostat control
to the immersion bulb location and remove
immersion bulb from tank, 11/16" wrench.
7. Remove (pull) thermostat dial from stem of
thermostat control.
8. Remove the two control mounting screws and
remove thermostat control from control panel.
9. Disconnect wire leads to the thermostat control.
NOTE: It may be necessary to identify wires for
proper reconnection to new thermostat.
Immersion Thermostat Replacement
1. Referring to Control Circuit Wire Diagram,
properly reconnect wire leads to new
thermostat control and install new control
inside control box using screws from step 8 of
Immersion Thermostat Removal.
2. Replace control dial to stem of thermostat.
3. Loosen ferrule nut of the immersion bulb (see
Figure 11).
4. Position tank nut at end of immersion bulb as
shown in Figure 11. Insert immersion bulb
into tank and tighten tank nut.
5. Gently pull copper capillary tube to insure the
immersion bulb is in a horizontal position as
shown in Figure 11 and tighten ferrule nut.
6. Resume the water supply, fill tank, and check
for leaks.
7. Be sure tank is full or water and resume
power supply to water heater. Verify proper
thermostat operation.
Figure 10
Figure 11
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