McQuay WGS190AW User Manual

54 WGS 130A to 190A OM WGS-5
Circuit Controller Functions
Refrigerant Calculations
Refrigerant Saturated Temperature
Refrigerant saturated temperature is calculated from the pressure sensor readings for each
circuit. The pressure will be fitted to a curve made up of 12 straight line segments. The
points used to define these segments are shown in the following tables.
Table 18, Evaporator Pressure Conversion:
Pressure (PSI) Temperature (
o
F)
0 -15.0
7.1 0
19.0 20.0
34.7 39.0
50.7 54.0
70.4 69.0
99.6 87.0
129.2 102.0
166.8 118.0
205.4 132.0
246.5 145.0
320.0 165.0
428.5 188.1
Table 19, Condenser Pressure Conversion:
Pressure (PSI) Temperature (
o
F)
0 0.6
17.5 18.5
31.5 35.9
50.0 53.7
76.0 73.4
115.0 95.6
161.5 116.2
185.0 125.2
260.0 149.2
284.5 155.9
349.5 172.0
365.5 175.5
428.5 188.1
Circuit Operating Mode
The circuits on the chiller can each be individually enabled or disabled. Test mode on each
circuit can also be entered independent of all other circuits. With the circuit switch on, the
circuit mode setpoint offers settings of either enable or disable. This simply allows the
circuit to be disabled through a keypad setting.
Circuit Test Mode
The circuit test mode allows manual testing of all controller outputs. Entering this mode
requires the following conditions.

McQuay WGS190AW Specifications

General

Brand	McQuay
Model	WGS190AW
Category	Chiller
Language	English