IOM 1210-1 • MAGNITUDE
®
MODEL WMC CHILLERS
30 www.DaikinApplied.com
o
peraTIon
Cooling Tower Bypass VALVE Setpoints
Figure 30: Tower Bypass VALVE Setpoint Screen
Table 7: Tower Bypass VALVE Setpoint Settings (See
page 32
for complete explanation.)
Description
No .
Default
Range
Password
Comments
Valve Control Slope Gain
15
1
0 to 99
T
Control gain for temperature (or lift) slope
Valve Control Error Gain
14
20
0 to 99
T
Control gain for temperature (or lift) error
Valve Control Range (Max)
13
100%
0 to 100%
T
Maximum valve position, overrides all other settings
Valve Control Range (Min)
12
10%
0 to 100%
T
Minimum valve position, overrides all other settings
Temp - Max Start Position
11
90 °F
0 to 100 °F
T
Condenser EWT at which valve should be open to tower. Valve position
is set to SP8
Maximum Start Position
10
100%
0 to 100%
T
Initial valve position when condenser EWT is at or above Setpoint # 9
Temp - Min Position
9
60 °F
0 to 100 °F
T
Condenser EWT at which initial valve position is set to Setpoint # 6
Minimum Start Position
8
10%
0 to 100%
T
Initial position of valve when condenser EWT is at or below Setpoint # 9
Stage Down @
7
20%
0 to 100%
T
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%
T
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
1.0 psi
0 to 20.0 psi
T
Control deadband, Tower - Setpoint #1=Lift
Valve Deadband (Temp)
4
1.0 °F
0 to 10.0 °F
T
Control deadband, Tower Setpoint #1=Temp
Valve Target (Lift)
3
30 psi
10 to 130 psi
T
Target for lift pressure (Tower - Setpoint #1= Lift), Works with Setpoint
# 5
Valve Target (Temp)
2
65 °F
40 to 120 °F
T
Target for condenser EWT (Tower Setpoint #1= Temp), Works with
Setpoint # 4
Tower Valve Type
1
NC (To Tower)
NC, NO
T
Normally closed (NC) or normal open (NO) to tower
NOTE:
Table 7
relies on Setpoints 1 and 2 in
Table 8 on page 31
. The setpoints listed in
Table 7
should only be changed by a
Daikin Applied technician. Contact a Daikin Applied service representative for more information.
