OMM 1008-1
43
Cooling TOWER Fan Settings
Figure 21, Cooling TOWER Fan Setpoint Screen
(See page 44 for complete explanation.)
Table 20, Tower Fan Settings
Description
No.
Default
Range
Pass-
word
Comments
Stage #4 On (Lift)
15
35 psi
10 to 130 psi
M
Lift pressure for fan stage #1 on
Stage #3 On (Lift)
14
45 psi
10 to 130 psi
M
Lift pressure for fan stage #2 on
Stage #2 On (Lift)
13
55 psi
10 to 130 psi
M
Lift pressure for fan stage #3 on
Stage #1 On (Lift)
12
65 psi
10 to 130 psi
M
Lift pressure for fan stage #4 on
Stage #4 On (Temp)
11
70
°
F
40 to 120
°
F
M
Temperature for fan stage #1 on
Stage #3 On (Temp)
10
75
°
F
40 to 120
°
F
M
Temperature for fan stage #2 on
Stage #2 On (Temp)
9
80
°
F
40 to 120
°
F
M
Temperature for fan stage #3 on
Stage #1 On (Temp)
8
85
°
F
40 to 120
°
F
M
Temperature for fan stage #4 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
Stage Down Time
5
5 min
1 to 60 min
M
Time delay between stage up/down event and
next stage down
Stage Up Time
4
2 min
1 to 60 min
M
Time delay between stage up/down event and
next stage up
Tower Stages
3
2
1 to 4
M
Number of fan stages used
Valve/VFD Control
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 SP3(4)
& 5(6)
Valve Stage: Valve control setpoint changes to
fan stage setpoint
VFD Stage: 1
st
fan is VFD controlled, no valve
Valve Setpoint/VFD Stage: Both valve and VFD
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
