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OPERATION
Description
Default
Range
1.7 for
Tandem
WMT092
Pressure
1-3.5
2.0 for
Ratio Limit
WMT106
No. of Com-
1
1 to 2
pressors
Software
Enabled,
Enabled
Enable
Disabled
Table 9: Compressor Setpoints
Description
Default
Range
Demand Limit/Current Limit (% RLA)
Demand
OFF
ON, OFF
Limit Enable
Maximum
70 to
100%
Amps
100%
Capacity
VFD Output
Factory
Model De-
Amps
Set
pendent
Wheel
Factory
Model De-
Wheel Type
Set
pendent
Harmonic Filter
Factory
Model De-
Amp Rating
Set
pendent
CAUTION
Chiller Nameplate RLA MUST match chiller dataplate per
compressor.
IOM 1297
PW
Comments
Max pressure
ratio for which a
lead-lag start will be
O
performed. A higher
pressure ratio will
trigger a tandem
start .
O
O
PW
Comments
ON: Limits % RLA
to a value set by the
Demand Limit analog
input,
where: 4 mA = 100%
RLA
O
20 mA = Min-
imum Demand Limit
Setpoint
OFF: The Demand
Limit input is ignored.
Inhibits capacity in-
crease above %RLA.
O
Unloading forced at
5% above value.
Sets the Rated Load
Amps (RLA) per
compressor phase as
T
given on the chiller
nameplate - Load
Side Phase Data.
Size of compressor
T
and impeller type
Based on model of
T
harmonic filter
Figure 37: Settings View - Tower
Table 10: Tower Setpoint Settings
Description
Default
Range
Tower Bypass
Valve Target
65
40 – 120
-Temp
Valve Target
30
10 – 100
- Lift
Valve Con-
trol Range
10
0 – 100%
- Min
Valve Con-
trol Range
90
0 – 100%
- Max
Control
Enable Tow-
Dis-
Disabled,
er Control
abled
Enabled
Cooling
None,
Tower
Temp
Temp, Lift
Control
None,
VFD
Stage
Tower Fan
None
0, VFD
VFD
Stage 1,
VFD all
stages
None,
Normally
Closed
Tower Valve
(NC),
None
Type
Normally
Open
(NO),
VFD
35
PW
Comments
Target value for
O
entering condenser
water temperature
Target value for lift
O
pressure
Minimum bypass
O
valve position
Maximum bypass
O
valve position
O
Selects target for
O
tower bypass and
fan control
None: No VFD
Control
VFD Stage 0: VFD
independent of fan
stage outputs
O
VFD Stage 1: VFD
on stage 1 only
VFD all stages: VFD
on all fan stages
None: No bypass
valve
NC: Valve is normal-
ly closed to tower
O
NO: Valve is normal-
ly open to tower
VFD: bypass valve
output controls con-
denser pump VFD
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