Compressor Heaters; Relief Valves; High Pressure Cutout - York YCAL0019 Installation, Operation And Maintenance Manual

FORM 150.67-NM1
ISSUE DATE: 4/28/2017

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.
JOHNSON CONTROLS

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.
SECTION 4 – INSTALLATION
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4