SmartPlate Installation, Operation & Maintenance Manual
CHAPTER 8
– CORRECTIVE MAINTENANCE
OMM-0069_0H
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8.10.2 CONTROL VALVE REPLACEMENT
To remove the complete Control Valve Assembly from the SmartPlate Water Heater:
CONTROL VALVE REPLACEMENT Instructions
1. Turn the POWER Switch on the side of the ECS/SP Control Box to
OFF
.
2. Loosen the two (2) captive screws securing the Electronics Module cover (Figure 8-22).
3. Remove the Module cover to access the wiring terminals (Figure 8-23). Disconnect and tag
the power and control signal wire leads from the Module terminals.
4. Connect a hose to the Blow-Down Valve/Drain on the lower pipe Strainer (Figure 8-24).
5. Close both Isolation Ball Valves on the Boiler Water pipe side of the unit.
6. Open the Blow-Down/Drain Valve on the Strainer.
Figure 8-24. Boiler Water Piping Components
7. While supporting the Control Valve from above, loosen all three (3) unions securing the
Valve.
8. Inspect the union seals and seats.
9. Install the replacement Control Valve and ensure that the seals are not pinched. Hand-
tighten the unions.
CAUTION!
Two (2) pipe wrenches MUST be used when tightening the Valve unions to prevent pipe
rotation and avoid leaks
10. Using two (2) pipe wrenches, secure the Control Valve unions to the Boiler Water piping.
11. Refer to Figure 8-23 and ensure that the three (3) DIP switches on the Electronics Module
of the replacement Valve are all in the OFF (down) position.
HEAT EXCHANGER
ISOLATION
BALL VALVES
DIFFERENTIAL
PRESSURE GAUGE
CONTROL
VALVE
BLOW-DOWN VALVE
(Connect Drain Hose Here)
