SmartPlate Installation, Operation & Maintenance Manual
CHAPTER 8
– CORRECTIVE MAINTENANCE
OMM-0069_0H
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8.7.1 OPENING HEAT EXCHANGER
Perform the following steps to shut down, drain and open the Double-Wall Heat exchanger:
OPENING HEAT EXCHANGER Instructions
1. Ensure that the Water Heater has been shut down and drained using the procedures in
section 8.6.1, steps 1 through 7.
2. If the Heat exchanger is hot (over 100°F), allow it to cool sufficiently before proceeding.
3. Remove the protective splash guard cover from the Double-Wall heat exchanger.
4. Inspect the sliding surfaces of the upper and lower support bars (Figure 8-7) and wipe
clean.
Figure 8-7. Double-Wall Heat Exchanger
5. Brush the threads of the tightening bolts clean using a steel wire brush.
6. Lubricate the threads of the tightening bolts with a thin layer of grease, such as
molybdenum disulfide or equivalent.
7. Remove the protective splash guard to provide access to the plate pack assembly (see
Figure 8-8, below).
8. Mark the plate pack assembly with a diagonal line as shown in Figure 8-8 or number the
plates in sequence.
IMPORTANT!
Measurement of tightening dimensions is critical to reassembly. Carefully measure and
record before loosening the tightening bolts.
9. Measure and record the lateral dimension "A" between the frame plate and pressure plate
as shown in Figure 8-8.
