10-2014 gForce User Manual ● 41
5.4 Water/Glycol System
5.4.1 Water/Glycol Cooled System Charging
All water/glycol cooled units are factory charged with refrigerant. The water regulating
valve should be adjusted to maintain the required conditions. Field charging, if
required, of water/glycol systems should be done by referring to the unit’s electrical
nameplate. The factory charge is indicated on the nameplate. Although this figure
represents the initial factory charge, it is still necessary to measure and note proper unit
operation including superheat, head and suction pressure. Some adjustment charge
may be required.
Adjust the refrigerant charge until the sight glass clears or has sparse bubbles. The
system should be allowed to stabilize for 15 to 20 minutes before meaningful
measurements can be taken. After the system is allowed to stabilize, verification of a
few key measurements should be noted.
105 to 119⁰F (41 to 48⁰C)
Saturated Suction Temperature
8 to 15⁰F (4.44 to 8.33⁰C) Differential
The superheat at the compressor suction line at least 6 inches (152 mm) away from the
compressor.
All water/glycol cooled units have a water regulating valve. A head pressure transducer
is connected to a Schrader fitting on the discharge line and water is regulated into the
condenser coil (plate fin condensers are standard).
WARNING:
Before starting a compressor, the crankcase heater should be
energized for a minimum of 12 hours to reduce the possibility of liquid
slugging on start-up. Failure to energize the crankcase heater could result
in compressor damage. If the system is charged from a vacuum, the
preheating of the compressor is not necessary.
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