SmartPlate Installation, Operation & Maintenance Manual
CHAPTER 8
– CORRECTIVE MAINTENANCE
OMM-0069_0H
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8.6 DOUBLE-WALL HEAT EXCHANGER CLEANING
The Double-Wall heat exchanger can be cleaned in-place by circulating cleaning agents through
the unit, or by disassembly.
8.6.1 HEAT EXCHANGER CLEANING AND DE-SCALING (IN-PLACE METHOD)
If the heat exchanger is not encrusted with hardened scale deposits, it can normally be cleaned
by circulating cleaning solution such as Rydlyme Chemical Descaler (available from Apex
Engineering Products Corp.) and clean water through the assembly. Perform the procedures
specified in Section I, section 8.3 of this chapter.
8.6.2 HEAT EXCHANGER CLEANING BY DISASSEMBLY
If the heat exchanger is encrusted with hardened scale or sediment, the Water Heater will have
to be drained and the Double-Wall heat exchanger opened as follows:
HEAT EXCHANGER CLEANING BY DISASSEMBLY Instructions
1. Set the POWER Switch on the ECS/SP Control Box to the OFF position to stop the
Recirculation Pump.
2. Close all four Water Heater Isolation Ball Valves (see Figure 8-5, above).
3. Connect a hose to the Strainer on the Boiler Water side of the piping assembly (Figure 8-
6).
Figure 8-6. Draining the SmartPlate Double-Wall Water Heater
DRAIN VALVE
DOMESTIC WATER
STRAINER
BOILER WATER
STRAINER
CONTROL VALVE
RELIEF VALVE
