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period (e.g., during the winter season). If Pump Sticking Pro-
tection (
Main Menu
Configuration Menu
Pump Con-
figuration
Pump Sticking Protection
) is set to YES and if
the unit is off at 2:00 PM, a pump will be started once each day
for 45 seconds. If the unit has 2 pumps, Pump 1 will be started
on even days (such as day 2, 4, or 6 of the month); Pump 2 will
be started on odd days (such as day 1, 3 or 5 of the month). The
default for this option is NO.
MASTER/SLAVE CHILLER PUMP OPERATION
If the Master/Slave function is active and if the chiller is the
lag unit, then the pump will be turned on when the unit is in On
mode and if the unit active lag demand limit is greater than 1%.
Otherwise, the pump will be stopped 30 seconds after the last
compressor is turned off. However, if the lag unit pump has
been configured to run even if the unit is commanded to stop
(
Main Menu
Configuration Menu
Master/Slave Config
Lag Unit Pump Control = 1 [Run if Unit Stops]
) then the
above condition will be ignored and the lag pump will run all
the time.
CHILLED WATER FLOW SWITCH STATUS
If Flow Checked if Pump Off (
Main Menu
Configuration
Menu
Pump Configuration
Flow Checked if Pump
Off
) is set to YES, the control will monitor the chilled water
flow switch status and will send an alarm if the pump is com-
manded off and the chilled water flow switch is closed. This
can provide the user with information about a faulty evaporator
pump contactor or a failed chilled water flow switch. This pa-
rameter should be set to NO for series flow machines. The fac-
tory default for this item is YES.
MANUAL OPERATION
The evaporator pumps can be forced ON through the CCN
when the chiller is off. This allows the unit to run with no delay
and for an unlimited length of time for flow rate calculations
when the unit is installed on site. Manual operation of the
pumps is controlled through CCN points
CPUMP_1
(
Main
Menu
Pump Status
) and
CPUMP_2
(
Main Menu
Pump Status
(0 = OFF, 1 = ON).
Circuit/Compressor Staging and Loading
The AquaForce
®
30XV chillers with Greenspeed
®
Intelligence
employ one compressor per circuit. As a result, circuit and
compressor staging are the same. The control has several con-
trol option parameters to load the compressors. The circuit/
compressor start can be configured as well as the loading of
each circuit/compressor.
CIRCUIT/COMPRESSOR STAGING
The control can be configured to decide which circuit/com-
pressor starts first. Three options for this variable are allowed:
Automatic Lead-Lag, Circuit A Leads, or Circuit B Leads. The
factory default is Automatic Lead-Lag.
The automatic lead-lag function determines which circuit/com-
pressor starts first to even the wear on the compressors. The con-
trol system determines the lead circuit to equalize the operating
time of each circuit (value weighted by the number of start-ups of
each circuit). As a result, the circuit with the lowest number of op-
erating hours always starts first. The parameter can also be config-
ured to always start a particular circuit/compressor first.
To configure this option:
CIRCUIT/COMPRESSOR LOADING/UNLOADING
The control uses an equal compressor loading and unloading
scheme as described below to optimize the efficiency of the unit.
At start-up, the control starts the lead compressor at the lowest
frequency and then continues to load it up by increasing fre-
quency output of the corresponding VFD. If the load reaches
65% of circuit load, then the control starts the lag compressor
at its minimum frequency. While the lag compressor starts to
load up, the lead compressor may ramp down to equalize with
lag compressor, depending on conditions. When the loading of
both compressors match, they continue to load up or load down
in unison in response to the capacity demand.
In the process of unloading, if both the compressors reach min-
imum frequency/load level, any further drop in capacity will
cause the lag compressor to switch off and the lead compressor
to ramp up until load is met again. Eventually with decrease in
load the compressor goes down to minimum frequency/load
and then shuts down. See Fig. 31 for a graphical representation
of initial system loading and unloading. (Figure 31 shows an
example of possible compressor loading for a given scenario.
Since the controls are adaptive, actual loading may vary.)
Fig. 31 — Initial Compressor Loading/Unloading Method
DISPLAY NAME
PATH
LINE
NO.
VALUE
Circuit Priority
Sequence
Main Menu
Configuration Menu
General
Configuration
1
0 = Auto
1 = Ckt A Priority
2 = Ckt B Priority
NOTE: After compressors are fully loaded, they will both load and unload
equally with the VFDs (variable frequency drives).
Summary of Contents for AquaForce 30XV140
Page 79: ...79 Fig 76 VFD Communication Wiring Compressor A B Fan VFD A1 A2 B1 B2...
Page 228: ...228 Fig 90 30XV Typical Field Wiring Schematic cont...
Page 229: ...229 Fig 91 30XV Standard Tier 140 275 All Voltages Power Schematic NOTE See Legend on page 226...
Page 230: ...230 Fig 92 30XV Standard Tier 300 325 All Voltages Power Schematic NOTE See Legend on page 226...
Page 240: ...240 Fig 99 30XV Communication Wiring...
Page 241: ...241 Fig 100 30XV 115V Control Wiring All Tonnages All Voltages...
Page 242: ...242 Fig 101 30XV 24V Control Wiring 30XV140 325 All Voltages...
Page 243: ...243 Fig 101 30XV 24V Control Wiring 30XV140 325 All Voltages cont...
Page 244: ...244 Fig 102 30XV 24V Control Wiring 30XV350 500 All Voltages...
Page 245: ...245 Fig 102 30XV 24V Control Wiring 30XV350 500 All Voltages cont...
Page 246: ...246 Fig 103 Component Arrangement Diagram for 30XV140 325...
Page 247: ...247 Fig 103 Component Arrangement Diagram for 30XV140 325 cont...
Page 248: ...248 Fig 104 Component Arrangement Diagram for 30XV350 500...
Page 337: ...337 APPENDIX J FACTORY SUPPLIED PUMPS cont Fig L System Information...
Page 338: ...338 APPENDIX J FACTORY SUPPLIED PUMPS cont Fig M Unit and Language Settings...
Page 341: ...341 APPENDIX J FACTORY SUPPLIED PUMPS cont Fig P Data Input 2...
Page 342: ...342 APPENDIX J FACTORY SUPPLIED PUMPS cont Fig Q Data Input 3...
Page 347: ...347 APPENDIX J FACTORY SUPPLIED PUMPS cont Fig U Pump Wiring Diagram...