Specifications
18
Cooler Pump Control — The AquaSnap
®
30MP ma-
chines are configured with the Cooler Pump Control (Configu-
ration
OPT1
CPC) = ON.
The maximum load allowed for the Chilled Water Pump
Starter is 5 VA sealed, 10 VA inrush at 24 volts. The starter coil
is powered from the chiller control system. The starter should
be wired between LVT 24 and TB3-1. If equipped, the field-in-
stalled chilled water pump starter auxiliary contacts should be
connected in series with the chilled water flow switch between
LVT 16 and LVT 17.
Ice Mode — When Ice Mode is enabled Cooling Setpoint
Select must be set to Dual Switch, Dual 7 day or Dual CCN
Occupied and the energy management module (EMM) must be
installed. Unit operation is based on Cooling Setpoint 1
(CSP.1) during the Occupied mode, Ice Setpoint (CSP.3) dur-
ing the Unoccupied mode with the Ice Done contacts open and
Cooling Setpoint 2 (CSP.2) during the Unoccupied mode with
the Ice Done contacts closed. These 3 set points can be utilized
to develop your specific control strategy.
Service Test — Both main power and control circuit
power must be on.
The Service Test function should be used to verify proper
operation of condenser output, compressors, minimum load
valve solenoid (if installed), cooler pump, and remote alarm re-
lay. To use the Service Test mode, the Enable/Off/Remote Con-
tact switch must be in the OFF position. Use the display keys to
enter the mode and display TEST. Press twice so that
OFF flashes. Enter the password if required. Use either arrow
key to change the TEST value to the ON position and press
. Move the Enable/Off/Remote Contact switch to en-
able. Press and the button to enter the OUTS or
COMP sub-mode. ENABLE/OFF/REMOTE switch
must be
ENABLE to operate test.
NOTE: Cooler and condenser (30MPW) water flow must be
established in order to operate compressor in service test.
Test the condenser output, cooler pump, liquid line solenoid
valve (30MPA only), crankcase heater, water valve (accesso-
ry), and alarm relay by changing the item values from OFF to
ON. These discrete outputs are then turned off if there is no
keypad activity for 10 minutes. When testing compressors,
lead compressor must be started first. All compressor outputs
can be turned on, but the control will limit the rate by staging
one compressor per minute. Minimum load valve can be tested
with the compressors on or off. The relays under the COMP
mode will stay on for 10 minutes if there is no keypad activity.
Compressors will stay on until they are turned off by the opera-
tor. The Service Test mode will remain enabled for as long as
there is one or more compressors running. All safeties are mon-
itored during this test and will turn a compressor, circuit or the
machine off if required. Any other mode or sub-mode can be
accessed, viewed, or changed during the TEST mode. The
STAT item (Run Status
VIEW) will display “0” as long as
the Service mode is enabled. The TEST sub-mode value must
be changed back to OFF before the chiller can be switched to
Enable or Remote contact for normal operation.
Cooler Pump Sequence of Operation — At any-
time the unit is in an ON status, as defined by the one of the
following conditions, the cooler pump relay will be enabled.
1. The Enable-Off-Remote Switch in ENABLE,
(CTRL=0).
2. Enable-Off-Remote Switch in REMOTE with a
Start-Stop remote contact closure (CTRL=0).
3. An Occupied Time Period from an Occupancy Schedule
in combination with items 1 or 2 (CTRL=2).
4. A CCN Start-Stop Command to Start in combination
with items 1 or 2 (CTRL=3).
There are certain alarm conditions and Operating Modes
that will turn the cooler pump relay ON. This sequence will de-
scribe the normal operation of the pump control algorithm.
When the unit cycles from an "On" state to an "Off' state,
the cooler pump output will remain energized for the Cooler
Pump Shutdown Delay (Configuration
OPT1
PM.DY).
This is configurable from 0 to 10 minutes. The factory default
is 1 minute. If the pump output was deenergized during the
transition period, the pump output will not be energized.
The Cooler Pump Relay will be energized when the ma-
chine is "On." The chilled water pump interlock circuit consists
of a chilled water flow switch and a field-installed chilled water
pump interlock. If the chilled water pump interlock circuit does
not close within five (5) minutes of starting, an A200 - Cooler
Flow/Interlock failed to close at Start-Up alam1 will be gener-
ated and chiller will not be allowed to start.
If the chilled water pump interlock or chilled water flow
switch opens for at least three (3) seconds after initially being
closed, an A201 - Cooler Flow 1 Interlock Contacts Opened
During Normal Operation alarm will be generated and the ma-
chine will stop.
Condenser Pump/Condenser Fan Output Con-
trol — The main base board (MBB) has the capability to
control either a condenser fan output or a condenser pump out-
put depending on the unit configuration.
If the unit is configured for Configuration
UNIT
TYPE = 2 (air cooled), then the output will be off as
long as capacity is equal to 0 and will be energized 5 seconds
before a compressor is started and remain energized until ca-
pacity is 0 again.
If the unit is configured for Configuration
UNIT
TYPE = 3 (water cooled), then the output will be used
for condenser pump control and additional configuration is re-
quired. To enable the condenser pump control use Configura-
tion
OPT1
D.PM.E. The pump can be configured for no
pump control (0), on when occupied (1), and on when ca-
pacity is greater than 0 (2).
Configuring and Operating Dual Chiller Con-
trol — The dual chiller routine is available for the control of
two units supplying chilled fluid on a common loop. This
control algorithm is designed for parallel fluid flow arrangement
only. One chiller must be configured as the master chiller, the
other as the slave. An additional leaving fluid temperature
thermistor (Dual Chiller LWT) must be installed as shown in
Fig. 13 and 14 and connected to the master chiller. Refer to Sen-
sors section, page 12, for wiring. The CCN communication bus
must be connected between the two chillers. Connections can be
made to the CCN screw terminals on LVT. Refer to Carrier
Comfort Network
®
Interface section, page 7, for wiring infor-
mation. Configuration examples are shown in Tables 11 and 12.
ENTER
ENTER
ESCAPE