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IOM 1210-1 • MAGNITUDE
®
MODEL WMC CHILLERS
o
peraTIon
Cooling TOWER Fan Setpoints
Figure 31: Cooling TOWER Fan Setpoint Screen
Table 8: Tower Fan Setpoint Settings (See
page 32
for complete explanation.)
Description
No .
Default
Range
Password
Comments
Stage #4 On (Lift)
15
65 psi
10 to 130 psi
M
Lift pressure for fan stage #4 on
Stage #3 On (Lift)
14
55 psi
10 to 130 psi
M
Lift pressure for fan stage #3 on
Stage #2 On (Lift)
13
45 psi
10 to 130 psi
M
Lift pressure for fan stage #2 on
Stage #1 On (Lift)
12
35 psi
10 to 130 psi
M
Lift pressure for fan stage #1 on
Stage #4 On (Temp)
11
85 °F
40 to 120 °F
M
Temperature for fan stage #4 on
Stage #3 On (Temp)
10
80 °F
40 to 120 °F
M
Temperature for fan stage #3 on
Stage #2 On (Temp)
9
75 °F
40 to 120 °F
M
Temperature for fan stage #2 on
Stage #1 On (Temp)
8
70 °F
40 to 120 °F
M
Temperature for fan stage #1 on
Stage Differential (Lift)
7
6.0 psi
1.0 to 20.0 psi
M
Fan staging deadband with Setpoint # 1=Lift
Stage Differential (Temp)
6
3.0 °F
1.0 to 10.0 °F
M
Fan staging deadband with Setpoint #1=Temp
Fan Stage Down Time
5
5 min
1 to 60 min
M
Time delay between stage up/down event and next stage down
Fan Stage Up Time
4
2 min
1 to 60 min
M
Time delay between stage up/down event and next stage up
Cooling Tower Stages
3
2
1 to 4
M
Number of fan stages used
Twr Bypass Valve/Fan
VFD
2
None
None, Valve Setpoint,
Valve Stage, VFD Stage,
Valve SP/VFD Stage
M
None: No tower valve or VFD
Valve Setpoint: Valve controls to VALVE SP2(4) & 3(5)
Valve Stage: Valve control setpoint changes to fan stage setpoint
VFD Stage: 1st fan is VFD controlled, no valve
Valve Setpoint/VFD Stage: Both valve and VFD
Cooling Tower Control
1
None
None, Temperature, Lift
M
None: No tower fan control Temperature: Fan and valve controlled by EWT
Lift: Fan and valve controlled by lift pressure