42 OMM 1008-1
Cooling Tower Bypass VALVE Settings
Figure 20, Tower Bypass VALVE Setpoint Screen
Table 19, Tower Bypass VALVE Setpoints (See page 44 for complete explanation.)
Description No. Default Range
Pass-
word
Comments
Slope Gain 15 65 10 to 99 M Control gain for temperature (or lift) slope
Error Gain 14 55 10 to 99 M Control gain for temperature (or lift) error
Valve Control Range(Max) 13 45% 0 to 100% M Maximum valve position, overrides all other settings
Valve Control Range (Min) 12 35% 0 to 100% M Minimum valve position, overrides all other settings
Temp - Maximum Start
Position
11
85 °F 0 to 100 °F
M
Condenser EWT at which valve should be open to tower.
Valve position is set to SP8
Maximum Start Position 10 80% 0 to 100% M
Initial valve position when condenser EWT is at or above
Setpoint # 9
Temp - Minimum Position 9
75 °F 0 to 100 °F
M
Condenser EWT at which initial valve position is set to
Setpoint # 6
Minimum Start Position 8 10% 0 to 100% M
Initial position of valve when condenser EWT is at or
below Setpoint # 7
Stage Down @ 7 20% 0 to 100% M
Valve position below which the fans can stage down
(Tower - Setpoint #2 = Valve Stage Down
VFD speed below which the next fan speed can turn off
(Tower - Setpoint # 2 = valve/VFD
Stage Up @ 6 80% 0 to 100% M
Valve position above which the fans can stage up (Tower
- Setpoint #2 = Valve Stage Down
VFD speed above which the next fan speed can turn on
(Tower - Setpoint # 2 = valve/VFD
Valve Deadband (Lift) 5 4.0 psi 1.0 to 20.0 psi M Control deadband, Tower - Setpoint #1=Lift
Valve Deadband (Temp) 4
2.0 °F 1.0 to 10.0 °F
M Control deadband, Tower Setpoint #1=Temp
Valve Target (Lift) 3 30 psi 10 to 130 psi M
Target for lift pressure (Tower - Setpoint #1= Lift), Works
with Setpoint # 5
Valve Setpoint (Temp) 2
65 °F 40 to 120 °F
M
Target for condenser EWT (Tower Setpoint #1= Temp),
Works with Setpoint # 4
Valve Type 1
NC (To
Tower)
NC, NO M
Normally closed (NC) or normal open (NO)
to tower
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