IM 1131-2
3
Introduction
Introduction
Chiller Nomenclature
General Description
Daikin Applied WGZ water chillers are designed for indoor
installations and are available with water-cooled condensers
(Model WGZ-DW), or arranged for use with remote, air-
cooled 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 shutoff valves, charging valves, filter-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, inwhich case a field-supplied and installed,
fused disconnect switch is required.
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 filed 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.
Note: Unit lifting weights and Corner operating weightsare
given in the weight tables beginning on
page 25
.
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 shutoff valve and the
compressor discharge valve common to a pair of compressors.
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 field
supplied and charged.
W G Z XXX D W
Water-Cooled
Global Design
Scroll Compressor
Nominal Tons
Condenser
Design Vintage
W = Standard Packaged
A = Less Condenser
CAUTION
If the unit is damaged, allowing the refrigerant to escape, there can be
danger of suffocation in the area since the refrigerant will displace the
air. Be sure to review Environmental Protection Agency (EPA)
requirements if damage occurs. Avoid exposing refrigerant to an open
flame.
