JOHNSON CONTROLS
35
SECTION 4 – INSTALLATION
FORM 150.67-NM2
ISSUE DATE: 01/31/2019
4
When using the Load Limit feature, the
PWM feature will not function – SIMUL-
TANEOUS OPERATION OF LOAD
LIMITING AND TEM PERATURE
RESET (PWM INPUT) CANNOT BE
DONE.
Flow Switch Input
The flow switch is field wired to CTB1 terminals 13
- 14. See Figure 4 on page 23 and unit wiring dia-
gram.
COMPRESSOR HEATERS
Compressor heaters are standard. ZP103, ZP120 and
ZP137 compressors utilize 90W heaters; ZP180 com-
pressors utilize 70W heaters; ZP235 compressors uti-
lize 120W heaters. If power is OFF more than two
hours, the crankcase heaters must be energized for 18
– 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 ± 10
PSIG and closes at 440 PSIG ± 25 PSIG.
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