SmartPlate Installation, Operation & Maintenance Manual
CHAPTER 8
– CORRECTIVE MAINTENANCE
OMM-0069_0H
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CORRECTIVE MAINTENANCE
8.1 INTRODUCTION
This chapter provides the procedures to correct and repair faults detected during operation or
isolated during troubleshooting of SmartPlate Water Heaters. The procedures in this chapter are
divided into four sections as follows:
•
Section
I
- SmartPlate Single-Wall Water Heater models: Single-Wall heat exchangers do
not include any serviceable assemblies and components. Therefore, the procedures in
this section are limited to heat exchanger cleaning (de-scaling) removal and replacement.
•
Section
II
– Double-Wall Heat Exchanger Corrective Maintenance. This section provides
cleaning and corrective maintenance procedures for serviceable internal components of
the double-wall heat exchanger.
•
Section
III –
SmartPlate Wetted Components - All models. This section provides
corrective maintenance for major assemblies and components which come in contact with
boiler water or domestic hot water during Water Heater operation. These assemblies and
components are used on all SmartPlate models (Single-Wall and Double-Wall).
•
Section
IV
– SmartPlate Electronic Control System (ECS/SP). This section provides
removal and replacement procedures for the internally mounted assemblies and
components contained in the ECS/SP Control Box.
SECTION I SMARTPLATE SINGLE-WALL HEAT EXCHANGER MODELS
8.2 SINGLE WALL HEAT EXCHANGER MAINTENANCE
Since the Single-Wall heat exchanger does not contain any serviceable items, the procedures in
this section are limited to cleaning (de-scaling) and removal/replacement. These procedures are
provided in sections 8.3 and 8.4 which follow.
8.3 HEAT EXCHANGER CLEANING & DE-SCALING
Heat exchanger cleaning and de-scaling is accomplished "in-place" using the procedure below.
NOTE:
The "in-place" cleaning/de-scaling procedure described below can also be used for Double-
Wall heat exchangers (Section II) which are not clogged with hardened scale deposits.
HEAT EXCHANGER CLEANING
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 (Figure 8-1).
3. Connect a hose to the Drain Valve near the DHW Outlet.
4.
Remove the 1” NPT Air Vent from the top of the Mixing Box.
