Power Supply Wiring - G&D VERTICAL AIR Series Installation Manual & User Manual

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REFRIGERANT CYCLE DESCRIPTION
The chiller refrigeration cycle is described below. Refrigerant evaporation occurs in the brazed plate evaporator.
Metered refrigerant vaporizes as it cools the chilled liquid flowing through the evaporator passages. The refrigerant
vapor leaves the evaporator as superheated gas. Refrigerant vapor generated in the evaporator flows to the
compressor suction manifold where it enters and flows across the compressor motor windings to provide cooling.
The vapor is then compressed by the compressor pistons and discharged. Oil from the compressor sump lubricates
the bearings and seals the small clearances between the piston rings and cylinder walls. Refrigerant vapor is dis-
charged to the air-cooled condenser as a hot vapor. After the refrigerant vapor condenses into liquid, it is returned
to the evaporator where the refrigerant again flashes into vapor and the refrigeration cycle repeats.
REFRIGERANT SYSTEM OPEN TIME
G&D chillers use POE oil and therefore refrigerant system open time must be kept to a minimum. The following
procedure is recommended:
Leave a new compressor sealed until it is ready to be installed in the unit. Maximum system open time is dependent
upon ambient conditions, but do not exceed one-hour open time.
Plug the open refrigerant line to minimize moisture absorption.
Always change the liquid line filter drier. Evacuate the system to 500 microns or below. Remove pressure transducer
and cap service ports prior to evacuating system. Transducers will be damaged if placed in vacuum.
Do not leave POE oil containers open to the atmosphere. Always keep them sealed.
MECHANICAL COMPRESSOR FAILURE
Replace the failed compressor(s) and change the refrigerant system liquid line filter drier.

POWER SUPPLY WIRING

WARNING: GROUND WIRE!
All field-installed wiring must be completed by qualified personnel. All field-installed wiring must comply with NEC
and applicable local codes. Failure to follow this instruction could result in death or serious injuries.
All power supply wiring must be sized and selected accordingly by the project engineer in accordance with NEC Table
310-16.
All wiring must comply with local codes and the National Electrical Code. The installing (or electrical) contractor must
provide and install the system interconnecting wiring, as well as the power supply wiring. It must be properly sized
and equipped with the appropriate fused disconnect switches.
The type and installation location(s) of the fused disconnects must comply with all applicable codes.
CAUTION: USE COPPER CONDUCTORS ONLY!
Unit terminals are not designed to accept other types of conductors. Failure to use copper conductors may result in
equipment damage.
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