IOM 1322 • WATER-COOLED SCROLL COMPRESSOR 6 www.DaikinApplied.com
General Description
Daikin Applied WGZ water chillers are designed for indoor
installations Equipment room temperature for operating and
standby conditions is 40°F to 122°F (4.4°C to 50°C).
They are available with water-cooled condensers (Model
WGZ-DW), or arranged for use with remote, aircooled or
evaporative condensers (Model WGZ-DA). Each water-
cooled unit is completely assembled and factory wired before
evacuation, charging and testing. They consist of hermetic
scroll compressors, brazed-plate evaporators on Models WGZ
030 to 130 or shell-and-tube on Models WGZ 150 to 200,
water-cooled condenser on Model WGZ-DW, and complete
refrigerant piping.
Units manufactured for use with remote condensers (Models
WGZ-DA) have all refrigerant specialties factory-mounted and
connection points for refrigerant discharge and liquid lines.
Liquid line components that are included are manual liquid line
shuto valves, charging valves, lter-driers, liquid line solenoid
valves, sight glass/moisture indicators, and expansion valves.
Other features include compressor crankcase heaters, and a
MicroTech II microprocessor controller.
The electrical control center includes all equipment protection
and operating controls necessary for dependable automatic
operation. Optional unit-mounted disconnect switche(s) may
not be present, in which case a eld-supplied and installed,
fused disconnect switch is required.
NOTE: This manual contains information on the chiller unit
control software operating with various refrigerants as
follows:
1. R-410A, used with the current “D” vintage of the WGZ
chiller.
2. R-134a, used with only with Model TGZ Templiers. The
operating manual devoted exclusively to Templiers is
OMM 1136.
Inspection
When the equipment is received, all items should be carefully
checked against the bill of lading to be sure of a complete
shipment. All units must be carefully inspected for damage
upon arrival. All shipping damage must be reported to the
carrier and a claim must be led with the carrier. The unit
serial plate should be checked before unloading the unit to be
sure that it agrees with the power supply available. Physical
damage to unit after acceptance is not the responsibility of
Daikin Applied.
Refrigerant Charge
Every model WGZ-DW water chiller with water-cooled
condensers is shipped with a full refrigerant charge. For
shipment, the charge is contained in the condenser and
is isolated by the condenser liquid shuto valve and the
compressor discharge valve common to a pair of compressors.
DANGER
If refrigerant leaks from the unit, there’s a potential danger of suffocation
since refrigerant will displace the air in the immediate area. Be sure to
follow all applicable industry related published standards and local, state
and federal, statutes, regulations and codes if a refrigerant leak occurs.
Avoid exposing refrigerant to an open ame.
A holding charge of nitrogen/helium is supplied in remote
condenser models, WGZ-DA and must be removed prior to
charging with refrigerant. The operating charge must be eld
supplied and charged.
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