IM 676
3
Introduction
General Description
McQuay SeasonPak air-cooled water chillers are complete, self-contained automatic refrigerating
units. Every unit is completely assembled, factory wired, charged, and tested. Each unit consists of
twin air-cooled condensers with integral subcooler sections, multiple accessible hermetic
compressors, replaceable tube dual circuit shell-and-tube evaporator, and complete refrigerant
piping. Liquid line components include manual liquid line shutoff valves, sight-glass/moisture
indicators, solenoid valves, and double diaphragm hydraulic element thermal expansion valves.
Other features include compressor crankcase heaters, an evaporator heater for chilled water freeze
protection, limited pumpdown during “on” or “off” periods, compressor lead-lag switch to alternate
the compressor starting sequence, and sequenced starting of compressors.
The electrical control center includes all safety and operating controls necessary for dependable
automatic operation. Condenser fan motors are fused in all three phases and started by their own
three-pole contactors. Compressors are not fused but may be protected by optional circuit breakers,
or by a field installed fused disconnect.
Inspection
Check all items carefully against the bill of lading. Inspect all units for damage upon arrival.
Report shipping damage and file a claim with the carrier. Check the unit name plate before
unloading, making certain it agrees with the power supply available. McQuay is not responsible for
physical damage after unit leaves the factory.
Note: Unit shipping and operating weights are available in the Physical Data tables
beginning on page 12.
Installation
Note: Installation is to be performed by qualified personnel who are familiar with local
codes and regulations.
WARNING
Sharp edges and coil surfaces are a potential hazard. Avoid contact with them.
Handling
Be careful to avoid rough handling of the unit. Do not push or pull the unit from anything other
than the base. Block the pushing vehicle away from the unit to prevent damage to the sheet metal
cabinet and end frame (see Figure 1).
To lift the unit, 2 1/2" (64mm) diameter lifting holes are provided in the base of the unit.
Arrange spreader bars and cables to prevent damage to the condenser coils or cabinet (see Figure 2).
