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4. INSTALLATION OF REMOTE OUTDOOR HEAT EXCHANGER
Air cooled condenser and uid coolers have individual User Manuals which should be referred to for
more complete details.
5. CHARGING
WARNING: Before starting a compressor, the crankcase heater should be
energized for a minimum of 12 hours to reduce the possibility of liquid slug-
ging on start-up. Failure to energize the crankcase heater could result in
compressor damage. If the system is charged from a vacuum, the preheat-
ing of the compressor is not necessary.
WARNING: Do not apply power to the compressor when in a vacuum.
WARNING: The constant speed compressor (2nd stage) must be charged
before charging the variable speed compressor (1st stage) in a dual circuit
system.
WARNING: The compressor power must be OFF and prevented from start-
ing inadvertently/automatically
NOTE: Prior to refrigerant charging, a system vacuum and moisture re-
moval procedure must have been carried out. Refer to Section __ for Triple
Evacuation prior to charging the system.
NOTE: Improper charging procedure could cause compressor damage in
several ways: excessive LP/HP pressure dierences, liquid slugging or vac-
uum operation. The below system refrigerant charge procedure is strongly
recommended to reduce these risks.
5.1 General Charging Guidelines
• Check the unit nameplate for refrigerant type to be used
• The unit must be wired correctly and prepped for operation
• Always use a scale to weigh in the calculated refrigerant charge listed in tables in individual
compressor charging sections before starting the unit, record system charge when com-
pleted
• The initial refrigerant must be charged at the liquid side of the refrigeration circuit with the
compressor OFF
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