www.DaikinApplied.com 31 IOM 1210-1 • MAGNITUDE
®
MODEL WMC CHILLERS
operaTIon
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
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