Service Manual

SERVICE PROCEDURE ACE-VIII
High Limit (ECO) Control Removal
and Replacement
Page 22
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
drain spigot of water heater and allow heater to drain
to a point below the Immersion bulb location
(see illustration 12).
4. Close drain spigot and remove hose.
5. Locate hi-limit control inside lower control box mounted
to the right inside surface of control box
(see illustration 12).
6. Follow copper capillary tube from control to the
immersion bulb location and remove immersion bulb
from tank, 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
9. 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.
10. Loosen ferrule nut of immersion bulb.
(see illustration 13)
Immersion
bulb
Ferrule
nut
Copper
capillary
tube
Tank
nut
11. Position tank nut at end of immersion bulb as shown in illustration 13. Insert immersion bulb into tank and tighten
tank nut.
12. Gently pull copper capillary tube to insure the immersion bulb is in a horizontal position as shown in illustration 13
and tighten ferrule nut.
13. Resume water supply, fill tank and check for leaks.
14. Be sure tank is full of water and resume power supply to water heater. Verify proper high limit operation.
DANGER
High voltage exposure. To avoid hazard to
Life or property, be sure power is turned
OFF to water heater while performing this
procedure.
Illustration 12
Illustration 13
ECO
control
Copper
capillary
ECO
immersion
bulb
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