OMM 1130-2 7
Unit Configuration
The chiller units have two refrigerant circuits, Models WGZ 030 to WGZ 130 have two tandem scroll
compressors (total of four), a single two-circuited brazed plate evaporator, a single two-circuited water-
cooled condenser, interconnecting refrigerant piping and a control panel with associated sensors and
transducers.
Models WGZ 150 to WGZ 200 have two refrigerant circuits, two trio scroll compressors (total of six), a
single two-circuited shell-and-tube evaporator, a single two-circuited water-cooled condenser,
interconnecting refrigerant piping and a control panel with associated sensors and transducers.
Figure 4, Schematic Piping Diagram (One of Two Circuits for WGZ030D – 130D)
NOTE: W
GZ 150 to WGZ 200 have a shell-and-tube evaporator, three compressors per circuit, and
electronic expansion valves.
Comp
#2
Comp
#1
Condenser
Condenser
Water
Evaporator
Chilled
Water
S
F-D
T
S
S
CV
SP
P
1
LWT
T
T
Legend:
Temperature Sensor
Pressure Transducer
Pressure (High Pressure Cutout)
Temperataure Sensor, Leaving
Chilled Water Control
T
T
T
P
P
1
LWT
Relief Valve
Schrader Fitting
Thermal Expansion Valve
Sight Glass / Moisture Indicator
Charging Valve
T
S
CV
S
Solenoid Valve
F-D
Filter-Drier
Angle Valve
Ball Valve