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IOM 1266-2 • MAGNITUDE
®
MODEL WME CHILLERS
Table 16: Tower Setpoint Settings
Description
Default
Range
PW
Comments
Valve Control Slope Gain
25
10 to 99
O
Control gain for temperature (or lift) slope
Valve Control Error Gain
25
10 to 99
O
Control gain for temperature (or lift) error
Valve Control Range (Max)
90%
0 to 100%
O
Maximum valve position, overrides all other settings
Valve Control Range (Min)
10%
0 to 100%
O
Minimum valve position, overrides all other settings
Temp–Max Start Position
90°F
0 to 100°F
O
Condenser EWT at which initial valve position is set to max start position
Maximum Start Position
100%
0 to 100%
O
Initial valve position when condenser EWT is at or above Temp-Max Start Position
Temp – Min Start Position
60°F
0 to 100°F
O
Condenser EWT at which initial valve position is set to minimum start position
Minimum Start Position
0%
0 to 100%
O
Minimum position of valve when condenser EWT is at or below Temp-Min Start
Position
Stage Down @
20%
0 to 100%
O
Valve position below which the fans can stage down
(Tower Valve/Fan VFD Strategy = Valve Stage)
VFD speed below which the fans can stage down
(Tower Valve/Fan VFD Strategy = VFD stage or valve SP/VFD stage)
Stage Up @
80%
0 to 100%
O
Valve position above which the fans can stage up
(Tower Valve/Fan VFD Strategy = Valve Stage)
VFD speed above which the fans can stage up
(Tower Valve/Fan VFD Strategy = VFD or valve SP/VFD stage)
VFD Minimum Speed
70%
0-100%
Minimum VFD speed for tower fan
Valve Deadband (Lift)
4.0 psi
1.0 to 20.0 psi
O
Sets control deadband, Cooling Tower Control = Lift
Valve Deadband (Temp)
2.0°F
1.0 to 10.0°F
O
Sets control deadband, Cooling Tower Control = Temp
Valve Target (Lift)
30 psi
10 to 130 psi
O
Target for lift pressure (Cooling Tower Control = Lift), Works with Fan Stage Down
Time
Valve Target (Temp)
65°F
40 to 120°F
O
Target for condenser EWT (Cooling Tower Control = Temp),
Works with Fan Stage Up Time
Tower Valve Type
NC (To Tower)
NC, NO
O
Normally closed or normally open to tower
Stage #2 On (Lift)
45 psi
10 to 130 psi
O
Lift pressure for fan stage #2 on
Stage #1 On (Lift)
35 psi
10 to 130 psi
O
Lift pressure for fan stage #1 on
Stage #2 On (Temp)
75°F
40 to 120°F
O
Temperature for fan stage #2 on
Stage #1 On (Temp)
70°F
40 to 120°F
O
Temperature for fan stage #1 on
Stage Differential (Lift)
6.0 psi
1.0 to 20.0 psi
O
Fan staging deadband with Cooling Tower Control = Lift
Stage Differential (Temp)
3.0°F
1.0 to 10.0°F
O
Fan staging deadband with Cooling Tower Control = Temp
Fan Stage Down Time
5 min
1 to 60 min
O
Time delay between stage up/down event and next stage down
Fan Stage Up Time
2 min
1 to 60 min
O
Time delay between stage up/down event and next stage up
Cooling Tower Stages
2
1 to 2
O
Number of fan stages used
Tower Valve/Fan VFD
Strategy
None
None, Valve SP, Valve
Stage, VFD Stage,
Valve SP/VFD Stage
O
None: No tower valve or VFD
Valve Setpoint: Valve controls to Valve Target and Valve Deadband
Valve Stage: Valve controls between fan stages
VFD Stage: 1st fan is VFD controlled, no valve
Valve SP/VFD Stage: Both valve and VFD
Cooling Tower Control
None
None, Temperature, Lift
O
None: No tower fan control
Temperature: Fan and valve controlled by condenser EWT
Lift: Fan and valve controlled by lift pressure
Содержание Magnitude WME Series
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