12. Reconnect the power and control signal wire leads to the Electronics Module of the
replacement Control Valve.
13. Turn ON the POWER Switch on the side of the ECS/SP Control Box.
14. Recalibrate the Control Valve using the procedures in Chapter 4, section 4.2.1.
15. Replace the cover on the Electronics Module after the Valve has been successfully
calibrated.
16. Return the unit to service.
8.11 RECIRCULATION PUMP REPLACEMENT
The SmartPlate Recirculation Pump is a wet rotor, continuous-duty Pump which has an
expected service life of 5 years. The Pump is located in the DHW side of the piping assembly
(Figure 8-25) to continuously circulate domestic water through the unit, even when there is no
DHW demand. If the Pump fails, it must be replaced to ensure proper Water Heater operation.
Replacement is accomplished as follows:
1. Turn OFF the external power circuit breaker to the Water Heater and also turn OFF the
POWER Switch on the side of the ECS/SP Control Box.
2. Connect a hose to the DHW Drain Valve (Figure 8-25).
3. Close both Isolation Ball Valves on the DHW piping.
4. Open the DHW Drain Valve.
5. Open the Relief Valve to allow air to enter the piping while draining.
6. Disconnect the power leads from the Pump Head.
7. Remove the bolts on the Pump flanges and slide the Pump out from between the flanges.
8. When installing the replacement Recirculation Pump, ensure that the seals are in place
and are not pinched.
9. Reinstall the flange bolts and reconnect the power leads to the Pump Head.
10. Close the Relief Valve opened in step 5.
11. Close the DHW Drain Valve that was opened in step 4.
12. Connect a hose to the Blow-Down Valve on the Inlet Strainer. Open this Blow-Down Valve
on the Strainer to vent air during the filling process.
13. Open the lower Isolation Ball Valve (DHW Outlet).
14. Next, close the Blow-Down Valve on the Inlet Strainer and open the upper Isolation Ball
Valve (DHW Inlet).
15. Reconnect the power leads to replacement Recirculation Pump Head.
16. Turn ON the external circuit breaker and set the POWER Switch on the side of the ECS/SP
Control Box to the ON position to return the unit to service use.
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