43
JOHNSON CONTROLS
SECTION 4 – INSTALLATION
FORM 150.67-NM1
ISSUE DATE: 4/28/2017
4
COMPRESSOR HEATERS
Compressor heaters are standard. Non-standard appli-
cations are as follows:
• ZP103, ZP120 and ZP137 compressors utilize
90W heaters
• ZP180 compressors utilize 70W heaters
• ZP235 compressors utilize 120W heaters
If power is OFF more than two hours, the crankcase
heaters must be energized for between 18 and 24 hours
prior to restarting a compressor. This will assure that
liquid slugging and oil dilution does not damage the
compressors on start.
RELIEF VALVES
Relief valves are located on both the high and low pres-
sure side of the piping. High side relief valve pressure
setting is 650 PSIG. Low side relief valve pressure
setting is 450 PSIG.
HIGH PRESSURE CUTOUT
A high pressure cutout is installed in the discharge pip-
ing of each system. The cutout opens at 585 PSIG plus
or minus 10 PSIG and closes at 440 PSIG plus or mi-
nus 25 PSIG.
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