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IOM 1210-1 • MAGNITUDE
®
MODEL WMC CHILLERS
o
peraTIon
Table 24 continued: Controller Setpoints
Description
Default
Range
PW
Bypass Valve, Step and Wait Control
Step
6 sec
0 to 999 sec
T
Derivative
1
0 to 99
T
Gain
20
0 to 99
T
Dead Band (D-Band)
1.0
0 to 200
T
Tower Fan, PID Control
Integral
600 sec
0 to 999 sec
T
Derivative
1 sec
0 to 999 sec
T
Proportional Gain (K)
80
0 to 999 sec
T
Dead Band (DB)
0
0 to 9.9 UOM
T
Update Period (TC)
500 ms
0 to 9999 ms
T
Additional WMC Tower Reset
Tower Reset (Temp)
10 psi
0 to 20.0 psi
T
Tower Reset (Lift)
5.0 °F
0 to 10.0 °F
T
Sensor Selection
ECWT-B3
ECWT-B3 (provided) or EHRT-B9 (not provided)
T
Alarms
Evaporator Freeze
34.0 °F
-9.0 to 45.0 °F
T
Condenser Freeze
34.0 °F
-9.0 to 45.0 °F
T
Low Evap Pressure - Stop
25 psi
5 to 45 psi
T
Low Evap Pressure - Inhibit
30 psi
7 to 45 psi
T
Low Evap Pressure - Unload
29 psi
6 to 45 psi
T
High Discharge Temperature - Shutdown
190 °F
120 to 240 °F
T
High Discharge Temperature - Load
170 °F
120 to 240 °F
T
High Condenser Pressure
140 psi
120 to 270 psi
T
Motor Current Threshold
5%
1 to 20%
T
Surge High Suction SH - Start
20 °F
1 to 99 °F
T
Surge High Suction SH - Run
12°F
2 to 25 °F
T
Service
Unload Timer
120 sec
5 to 300 sec
T
Interlock Timer
10 sec
1 to 240 sec
T
