IOM 1210-7 • MAGNITUDE
®
MODEL WMC CHILLERS
40 www.DaikinApplied.com
o
peraTIon
Cooling Tower Fan Setpoints
Figure 35:
TOWER Fan and Valve Setpoint Screen
Table 14:
TOWER Fan and Valve Setpoint Settings (See
for complete explanation.)
*Continued on next page
Description
Default
Range
Password
Comments
Valve Deadband (Lift)
[SP5]
1.0 psi
0 to 20.0 psi
T
Control deadband, Tower SP1 =Lift
Valve Deadband (Temp)
[SP4]
1.0 °F
0 to 10.0 °F
T
Control deadband, Tower SP1=Temp
Valve Target (Lift)
30 psi
10 to 130 psi
T
Target for lift pressure (Tower SP1= Lift), Works with SP5
Valve Target (Temp)
[SP2]
65 °F
40 to 120 °F
T
Target for condenser EWT (Tower SP1= Temp), Works with SP4
Maximum Start Position
[SP10]
100%
0 to 100%
T
Initial valve position when condenser EWT is at or above SP11
Temp - Min Position
[SP9]
60 °F
0 to 100 °F
T
Condenser EWT at which initial valve position is set to SP8
Minimum Start Position
[SP8]
10%
0 to 100%
T
Initial position of valve when condenser EWT is at or below SP9
Inverted Start Position
0%
0 to 100%
T
Selects the EXV position for an inverted chiller start.
Valve Control Slope Gain
1
0 to 99
T
Control gain for temperature (or lift) slope
Valve Control Error Gain
20
0 to 99
T
Control gain for temperature (or lift) error
Valve Control Range
(Max)
100%
0 to 100%
T
Maximum valve position, overrides all other settings
Valve Control Range
(Min)
10%
0 to 100%
T
Minimum valve position, overrides all other settings
Stage Down @
20%
0 to 100%
T
Valve position below which the fans can stage down (Tower - SP2 = Valve Stage Down
VFD speed below which the next fan speed can turn off (Tower - SP2 = valve/VFD.
(Valve position % closed)
Stage Up @
80%
0 to 100%
T
Valve position above which the fans can stage up (Tower - SP2 = Valve Stage Down
VFD speed above which the next fan speed can turn on (Tower - SP2 = valve/VFD.
(Valve position % open)
Stage #4 On (Lift)
65 psi
10 to 130 psi
M
Lift pressure for fan stage #4 on
Stage #3 On (Lift)
55 psi
10 to 130 psi
M
Lift pressure for fan stage #3 on
Stage #2 On (Lift)
45 psi
10 to 130 psi
M
Lift pressure for fan stage #2 on
Stage #1 On (Lift)
35 psi
10 to 130 psi
M
Lift pressure for fan stage #1 on
Stage #4 On (Temp)
85 °F
40 to 120 °F
M
Temperature for fan stage #4 on
Stage #3 On (Temp)
80 °F
40 to 120 °F
M
Temperature for fan stage #3 on
Stage #2 On (Temp)
75 °F
40 to 120 °F
M
Temperature for fan stage #2 on
Stage #1 On (Temp)
70 °F
40 to 120 °F
M
Temperature for fan stage #1 on
Stage Differential (Lift)
6.0 psi
1.0 to 20.0 psi
M
Fan staging deadband with SP1=Lift
