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SERVICE PROCEDURE MCE-XIII
C
ontactor Model High Limit (ECO) Control
Removal and Replacement
Page 28
Contactor Model High Limit (ECO) Control
Removal and 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 18).
3. Close drain spigot and remove hose.
4. Remove lower control box cover and insulation.
5. Locate ECO control inside lower control box mounted to
the right side of the box, above the thermostat control
(see illustration 18).
6. Follow copper capillary tube from ECO control to the
immersion bulb location and remove immersion bulb
from tank, 11/16 wrench.
7. Remove the two ECO control mounting screws
located outside the lower control box.
8. Once ECO control is removed, disconnect
wire leads to the control. NOTE: It may be
necessary to identify wires for proper reconnection to
new control.
9. Refer to wiring diagram located on the inside of the
upper control box cover and properly reconnect wire
leads to new ECO control and remount control inside
control box using screws from step 7.
10. Loosen ferrule nut of immersion bulb.
(see illustration 19)
Immersion
bulb
Ferrule
nut
Copper
capillary
tube
Tank
nut
11. Position tank nut at end of immersion bulb as shown in illustration 19. 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 19
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 ECO 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.
ECO
Immersion Bulb
L
ocation
Copper Capillary
Tube
Illustration 18
Illustration 19
Thermostat
Control
E
CO
C
ontrol
28