McQuay WHR 040, Installation And Maintenance Data

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INTRODUCTION
This manual covers only the mechanical aspects of WHR chillers equipped with the MicroTech reciprocating chiller con-
trol. All of the operating, safety control and installation requirements of the MicroTech control are coveted in the separate
Installation and Maintenance Bulletin 493, which must be consulted before startup and operation is attempted.
GENERAL DESCRIPTION
McQuay Type WHR SEASONPAK water chillers are de-
signed for indoor installations and are compatible with either
air or water as a condensing medium. Each unit is complete-
ly assembled and factory wired before evacuation, charging
and testing. Each unit consists of multiple accessible hermetic
compressors, replaceable tube dual circuit shell-and-tube
evaporator, water cooled condenser, and complete or partial
refrigerant piping depending on the condensing medium.
port type thermal expansion valves. Other features include
compressor crankcase heaters, recycling pumpdown during
“on” or “off” seasons, compressor lead-lag switch to alter-
nate the compressor starting sequence, and sequenced star-
ting of compressors.
Liquid line components that are included are manual liquid
line shutoff valves, charging valves, filter-driers, liquid line
solenoid valves, sightglass/moisture indicators, and balance
The electrical control center includes. all safety and operat-
ing controls necessary for dependable automatic operation.
Compressors are not fused, but may be protected by op-
tional circuit breakers, or may rely on the field installed
fused disconnect for protection.
NOMENCLATURE
W HR D W
Basic Unit with Single Water Cooled
Condenser per Refrigerant Circuit
H
Basic Unit with Dual Water Cooled Condensers per Refrigerant Circuit
Nominal Capacity (Tons)
INSPECTION
When the equipment is received, all items should be careful-
be checked before unloading the unit to be sure that it agrees
ly checked against the bill of lading to insure a complete ship-
with the power supply available. Physical damage to unit after
ment. All units should be carefully inspected for damage upon acceptance is not the responsibility of McQuay.
arrival. All shipping damage should be reported to the car-
NOTE: Unit shipping and operating weights are available
rier and a claim should be filed. The unit serial plate should in the physical data table (pages 21 through 23).
INSTALLATION
NOTE: Installation and maintenance are to be performed only by qualified personnel who are familiar with local codes
and regulations, and experienced with this type of equipment. CAUTION: Sharp edges are a potential injury hazard.
Avoid contact.
HANDLING
Every model WHR SEASONPAK water chiller with water
cooled condensers (Arrangements W and H) is supplied with
a full refrigerant charge. A holding charge is supplied in con-
denserless models (Arrangement A). For shipment the charge
is contained in the condenser and is isolated by the manual
condenser liquid valve and the compressor discharge ser-
vice valve.
MOVING
The McQuay SEASONPAK water chiller is mounted on heavy
wooden skids to protect the unit from accidental damage and
to permit easy handling and moving.
It is recommended that all moving and handling be per-
formed with the skids under the unit when possible and that
the skids not be removed until the unit is in the final location.
When moving the unit, dollies or simple rollers can be
used under the skids.
Never put the weight of the unit against the control box.
In moving, always apply pressure to the base on skids on-
ly and not to the piping or shells. A long bar helps move the
unit easily. Avoid dropping the unit at the end of the roll.
If the unit must be hoisted, it is necessary to lift the unit
by attaching cables or chains at the lifting holes in the
evaporator tube sheets. Spreader bars must be used to pro-
tect the control cabinet and other areas of the chiller (see
Figure 1).
Should the unit be damaged, allowing the refrigerant to
escape, there may be danger of suffocation in the equipment
area since the refrigerant will displace the air. Avoid expos-
ing an open flame to refrigerant. Care should be taken to avoid
rough handling or shock due to dropping the unit. NEVER
LIFT, PUSH OR PULL UNIT FROM ANYTHING OTHER
THAN THE BASE.
THE UNIT
Figure 1.
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