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Chapter 4
If water does come out of the process valve, the
entire system must be replaced. See “Replacing a
Single-Wall Water-Utilizing System” below.
If water does not come out of the process valve,
there is still a possibility that some water has leaked
into the refrigerant side of the system. To address
this possibility, determine if the system has a history
of losing refrigerant charge without a leak being
found or repaired.
If you find ANY indication of a history of losing
refrigerant charge without detection of a leak, this is
a sign that refrigerant has leaked in the water inside
the heat exchanger. The entire system must be
replaced. See “Replacing a Single-Wall Water-Utiliz-
ing System” below.
If you do not find any indication of a history of loss
of charge without detection of a leak, you still need
to install:
• a high-pressure cut-out which interrupts power
to ALL leads to the compressor, or
• an external pressure relief valve.
Also, if you found a ground fault in the compressor
in Step 1, replace the compressor before applying
power to the system.
D. Replacing a Single-Wall Water-Utilizing
System
When replacing a single-wall water-utilizing system,
replace the system with one that has:
• a double-wall heat exchanger(s), or
• a high-pressure cut-out which interrupts power
to ALL leads to the compressor, or
• an external pressure relief valve.
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