Periodic Pump Quick Start; Master/Slave Chiller Pump Operation; Chilled Water Flow Switch Status; Manual Operation - Carrier AquaForce 30XV140 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

the last compressor is turned off. The pump will be turned
on when requested by the evaporator heater function (see
the Evaporator Freeze Protection section on page 59).
PERIODIC PUMP QUICK START — The control system
has the ability to start the pumps periodically to maintain
bearing lubrication and seal integrity. This function will be
used when the unit is stopped for a long time period (e.g.,
during the winter season). If Pump Sticking Protection
(Main Menu  Configuration Menu  Pump Configura-
tion  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) 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 of a faulty evaporator
pump contactor or a failed chilled water flow switch. This
parameter should be set to NO for series flow machines.
The factory default for this item is YES.
MANUAL OPERATION — The evaporator pumps can be
forced ON through the CCN when the chiller is off. This al-
lows the unit to run with no delay and for an unlimited
length of time for flow rate calculations when the unit is in-
stalled on site. Manual operation of the pumps is controlled
through CCN points CPUMP_1 (Main Menu  Pump Sta-
tus) and CPUMP_2 (Main Menu  Pump Status (0 = OFF,
1 = ON).
Circuit/Compressor Staging and Loading —
The AquaForce ® 30XV chillers with Greenspeed
gence employ one compressor per circuit. As a result, cir-
cuit and compressor staging are the same. The control has
several control 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/compressor 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 cir-
cuit/compressor starts first to even the wear on the compres-
sors. The control 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 operating hours always
starts first. The parameter can also be configured to always
start a particular circuit/compressor first.
To configure this option:
DISPLAY NAME
Circuit Priority
Sequence
CIRCUIT/COMPRESSOR LOADING/UNLOADING —
The control uses an equal compressor loading and unload-
ing 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 in-
creasing frequency 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 condi-
tions. 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 minimum 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. Eventu-
ally with decrease in load the compressor goes down to
minimum frequency/load and then shuts down. See Fig. 24
for a graphical representation of initial system loading and
unloading. (Figure 24 shows an example of possible com-
pressor loading for a given scenario. Since the controls are
adaptive, actual loading may vary.)
Dual Chiller Control —
lows for master/slave control of two units installed in parallel
or series arrangement supplying chilled fluid on a common
loop. The chillers must be linked by the Carrier Comfort Net-
work (CCN) network and operate on the same bus.
®
When the units are installed for parallel operation and
chilled water control is done on the outlet side of the units,
the dual chiller accessory kit (P/N 00EFN900044000A) is
required. The kit includes additional leaving fluid tempera-
ture thermistors that must be installed on the common
chilled water leaving piping as described in the Installation
Instructions for the kit. The leaving fluid temperature sen-
sors will be connected to each chiller as described in the in-
® intelli-
stallation instructions. When the chilled water control is
done on the inlet side of the parallel units no additional tem-
perature sensor is required. See the Field Wiring section in
the 30XV Installation Instructions for dual chiller LWT sen-
sor control wiring. When chillers are configured to operate
in series mode no additional chilled water temperature sen-
sor is required.
The master chiller will monitor all external commands
such as start/stop, demand limiting or set point select, and
needs to be started in Master operating type. The commands
are transmitted automatically to the slave unit, which must
operate in CCN (Network) mode. The slave chiller has no
action in the master/slave operations; it will only verify that
CCN communication with the master chiller is correct. If
the master chiller is turned off while the master/slave func-
tion is active then the slave chiller will be stopped. Under
certain circumstances, the slave unit may be started first to
balance the run times of the two units. In the event of a com-
munication failure between the two units, each unit will re-
turn to an autonomous operating mode until the fault is
cleared. If the master unit is stopped due to an alarm, the
slave unit is authorized to start and therefore the slave unit
configurations should be verified with desired set points.
26
LINE
PATH
NO.

Main Menu 1 0 = Auto
Configuration 1 = Ckt A Priority

Menu 2 = Ckt B Priority
General
Configuration
The dual chiller function al-
VALUE