Daikin WCT Series Operating & Maintenance Manual page 40

Figure 24, Tower Bypass VALVE Setpoint Screen
Table 15, Tower Bypass VALVE Setpoints
Description
Valve/VFD Control
Valve Type
Valve Setpoint (Temp)
Valve Target (Lift)
Valve Deadband (Temp)
Valve Deadband (Lift)
Stage Up @
Stage Down @
Minimum Start Position
Temp - Minimum Position
Maximum Start Position
Temp - Maximum Position
Valve Control Range (Min)
Valve Control Range(Max)
Error Gain
Slope Gain
OMM WCT
Default Range
None, Valve
Setpoint, Valve
None Stage, VFD
Stage, Valve
SP/VFD Stage
NC (To
NC, NO
Tower)
65 F 40 to 120 F
30 psi 10 to 130 psi
2.0 F 1.0 to 10.0 F
4.0 psi 1.0 to 20.0 psi
80% 0 to 100%
20% 0 to 100%
10% 0 to 100%
60 F 0 to 100 F
100% 0 to 100%
90 F 0 to 100 F
10% 0 to 100%
100% 0 to 100%
25 10 to 99
25 10 to 99
Centrifugal Chillers
Pass-
word
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
M
setpoint
st
VFD Stage: 1 fan is VFD controlled, no valve
Valve Setpoint/VFD Stage: Both valve and VFD
M Normally closed or normal open to tower
Target for condenser EWT (Tower Setpoint #1= Temp),
M
Works with Setpoint # 4
Target for lift pressure (Tower Setpoint #1= Lift), Works
M
with Setpoint # 5
M Control deadband, Tower Setpoint #1=Temp
M Control deadband, Tower Setpoint #1=Lift
Valve position above which the fans can stage up (Tower
Setpoint #2 = Valve Stage Down
M
VFD speed above which the next fan speed can turn on
(Tower Setpoint # 2 = valve/VFD ????
Valve position below which the fans can stage down
(Tower Setpoint #2 = Valve Stage Down
M
VFD speed below which the next fan speed can turn off
(Tower Setpoint # 2 = valve/VFD ????
Initial position of valve when condenser EWT is at or
M
below Setpoint # 7
Condenser EWT at which initial valve position is set to
M
Setpoint # 6
Initial valve position when condenser EWT is at or above
M
Setpoint # 9
M Condenser EWT at which valve should be open to tower
M Minimum valve position, overrides all other settings
M Maximum valve position, overrides all other settings
M Control gain for temperature (or lift) error
M Control gain for temperature (or lift) slope
Comments
D-EOMWC01302-16EN - 40/84