AERCO SmartPlate - Manual (Page 81)

SmartPlate Installation, Operation & Maintenance Manual
CHAPTER 8 – CORRECTIVE MAINTENANCE
OMM-0069_0E AERCO International, Inc.  100 Oritani Dr.  Blauvelt, NY 10913 Page 81 of 138
SP-100 Phone: 800-526-0288 PRI: 11/26/2013
8.10.2 Control Valve Replacement
To remove the complete Control Valve Assembly from the SmartPlate Water Heater:
1. Turn OFF the POWER Switch on the side of the ECS/SP Control Box.
2. Loosen the two (2) captive screws securing the Electronics Module cover (Figure 8-21).
3. Remove the Module cover to access the wiring terminals (Figure 8-7). 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 8-23).
5. Close both Isolation Ball Valves on the Boiler Water pipe side of the Heater.
6. Open the Blow-Down/Drain Valve on the Strainer.
Figure 8-23. 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.