20 OMM 1008-1
Description Default Range Type PW
Stage Up Time 2 min 1 to 60 min N M
Stage Down Time 5 min 1 to 60 min N M
Stage Differential (Temp)
3.0 °F 1.0 to 10.0 °F
N M
Stage Differential (Lift) 6.0 psi 1.0 to 20.0 psi N M
Stage #1 On (Temp)
70 °F 40 to 120 °F
N M
Stage #2 On (Temp)
75 °F 40 to 120 °F
N M
Stage #3 On (Temp)
80 °F 40 to 120 °F
N M
Stage #4 On (Temp)
85 °F 40 to 120 °F
N M
Stage #1 On (Lift) 35 psi 10 to 130 psi N M
Stage #2 On (Lift) 45 psi 10 to 130 psi N M
Stage #3 On (Lift) 55 psi 10 to 130 psi N M
Stage #4 On (Lift) 65 psi 10 to 130 psi N M
Cooling Tower Valve / VFD
Valve/VFD Control None
None, Valve Setpoint, Valve Stage,
VFD Stage, Valve SP/VFD Stage
N M
Valve Setpoint (Temp)
65 °F 40 to 120 °F
N M
Valve Setpoint (Lift) 30 psi 10 to 130 psi N M
Valve Deadband (Temp)
2.0 °F 1.0 to 10.0 °F
N M
Valve Deadband (Lift) 4.0 psi 1.0 to 20.0 psi N M
Stage Down @ 20% 0 to 100% N M
Stage Up @ 80% 0 to 100% N M
Valve Control Range (Min) 10% 0 to 100% N M
Valve Control Range(Max) 90% 0 to 100% N M
Valve Type
NC
(To Tower)
NC, NO N M
Minimum Start Position 0% 0 to 100% N M
Minimum Position @
60 °F 0 to 100 °F
N M
Maximum Start Position 100% 0 to 100% N M
Maximum Position @
90 °F 0 to 100 °F
N M
Error Gain 25 10 to 99 N M
Slope Gain 25 10 to 99 N M
Alarms
Evaporator Freeze
34.0 °F -9.0 to 45.0 °F
D T
Condenser Freeze
34.0 °F -9.0 to 45.0 °F
D T
Low Evap Pressure 26 psi 10 to 45 psi D T
Low Evap Pressure-Inhibit 38 psi 20 to 45 psi D T
Low Evap Pressure-Unload 31 psi 20 to 45 psi D T
High Discharge Temperature-
Shutdown
190 °F 120 to 240 °F
N T
High Discharge Temperature-
Load
170 °F 120 to 240 °F
N T
High Condenser Pressure 140 psi 120 to 240 psi D T
Motor Current Threshold 10% 1 to 20% N T
Surge High Suction SH - Start
50 °F 25 to 90 °F
N T
Surge High Suction SH - Run
25 °F 5 to 45 °F
N T
Service
Vane Mode AUTO AUTO, MANUAL N T
Unload Timer 10 sec 10 to 240 sec N T
STOP Timer 1 sec 1 to 240 sec N T
These setpoints are normally viewed or changed on the OITS.
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