Service Manual

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High Limit Control (ECO) 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 the
drain spigot of the water heater and allow heater to drain
to a point below the Immersion bulb location (see Figure 12).
4. Close drain spigot and remove hose.
5. Locate High-Limit Control inside the lower control box
mounted to the right inside surface of control box
(see Figure 12).
6. Follow copper capillary tube from control to the immersion
bulb location and remove immersion bulb from tank using
an 11/16" wrench.
7. Remove the two control mounting screws located outside
the control box.
8. Disconnect wire leads to the control. NOTE: It may be
necessary to identify wires for proper reconnection to new
control.
High Limit Control (ECO) Replacement
1. Refer to control circuit wiring diagram located on the inside
of the control box and properly reconnect wire leads to new
control and install new control inside control box using
screws from step 7 of High Limit Control (ECO) Removal.
2. Loosen ferrule nut of immersion bulb (see Figure 13).
3. Position tank nut at end of immersion bulb as shown in Figure
13. Insert immersion bulb into tank and tighten tank nut.
4. Gently pull copper capillary tube to insure the immersion
bulb is in a horizontal position as shown in Figure 13 and
tighten ferrule nut.
5. Resume the water supply, fill tank, and check for leaks.
6. Be sure tank is full of water and resume power supply to
water heater
. Verify proper High Limit operation.
Figure 12
Figure 13
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