Optional Factory-Installed Hydronic Package; Cooler Pump Control; Cooler Pump Operation; Cooler Pump Sequence Of Operation - Carrier AquaSnap 30RAP011-060 Controls, Start-Up, Operation, Service, And Troubleshooting

Optional Factory-Installed Hydronic Package

If the chiller has factory-installed chilled fluid pumps, specific
steps should be followed for proper operation.

Cooler Pump Control

The AquaSnap 30RAP machines equipped with a factory-in-
®
stalled pump package are configured with the Cooler Pump Con-
trol (Configuration  OPT1  CPC) = ON.
Machines not equipped with a pump package are configured with
the cooler pump control OFF. It is recommended that the machine
control the chilled water pump. If not, a 5-minute time delay is re-
quired after command to shut machine down is sent before chilled
water pump is turned off. This is required to maintain water flow
during shutdown period of the machine.
With or without this option enabled, the cooler pump relay will be
energized when the machine enters an ON status (i.e., On Local,
On CCN, On Time). An A207 — Cooler Freeze Protection Alarm
will energize the cooler pump relay also, as an override. The cool-
er pump relay will remain energized if the machine is in MODE
10 – Minimum Off Time.

Cooler Pump Operation

Two options of pump operation are available with 30RAP units
(Configuration  OPT1  PMP.O).
The factory default for PMP.O is 0 (Auto) for automatic. In this
mode, the pump will be energized any time the unit is enabled, or
for a freeze condition. The pump will be de-energized in any
alarm other than A207 – Cooler Freeze Protection alarm.
If PMP.O is set to 1 (Continuous), the chilled water pump will be
energized any time the unit is enabled. If the unit is in an alarm
condition, the pump will remain energized. Because of this fea-
ture, a High Temperature Cut-Off variable, Configuration 
OPT1  PM.HT has been added for field configuration. If the
leaving chilled water temperature exceeds the configured value,
the pump will shut off to avoid overheating the chilled loop. The
factory default is 95°F (35°C) and has a range of 95 to 125°F (35
to 52°C). This variable is only active when PMP.O is set to 1.

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. Enable-Off-Remote Switch in ENABLE, (CTRL=0).
2. Enable-Off-Remote Switch in REMOTE with a Start-Stop
Remote Control 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).
As stated before, there are certain alarm conditions and Operating
Modes that will turn the cooler pump relay ON. This sequence
will describe 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.
NO INTEGRAL PUMP — SINGLE EXTERNAL PUMP
CONTROL
With a single external pump, the following options must be con-
figured:
• Cooler Pump Control (Configuration  OPT1  CPC) =
OFF.
• Cooler Pump 1 Enable (Configuration  OPT1  PM1E)
= NO.
• Cooler Pump 2 Enable (Configuration  OPT1  PM2E)
= NO.
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 be-
tween LVT-25 and LVT-21. If equipped, the field-installed chilled
water pump starter auxiliary contacts should be connected in se-
ries with the chilled water flow switch.
The Cooler Pump Relay will be energized when the machine 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/Inter-
lock Failed to Close at Start-Up Alarm will be generated 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/Interlock Contacts Opened During Normal
Operation Alarm will be generated and the machine will stop.
NO INTEGRAL PUMP — DUAL EXTERNAL PUMP CON-
TROL
With two external pumps, the following options must be config-
ured:
Cooler Pump Control (Configuration  OPT1  CPC) =
•
ON.
• Cooler Pump 1 Enable (Configuration  OPT1  PM1E)
= YES.
• Cooler Pump 2 Enable (Configuration  OPT1  PM2E)
= YES.
The maximum load allowed for the Chilled Water Pump Starters
is 5 VA sealed, 10 VA inrush at 24 volts. The starter coil is pow-
ered from the chiller control system. The starter for Chilled Water
Pump 1 should be wired between LVT-25 and LVT-21. The starter
for Chilled Water Pump 2 should be wired between LVT-24 and
LVT-21. A field-installed chilled water pump interlock for each
pump must be connected to each pump's interlock points on the
main base board. The chilled water pump 1 interlock, CWP1,
must be connected to MBB-J7-1 and -2. The chilled water pump 2
interlock, CWP2, must be connected to MBB-J7-3 and -4. The
chilled water pump interlock contacts should be rated for dry cir-
cuit application capable of handling 5 vdc at 2 mA.

SINGLE INTEGRAL PUMP CONTROL

With a single pump, the following options must be configured:
• Cooler Pump Control (Configuration  OPT1  CPC) =
ON.
• Cooler Pump 1 Enable (Configuration  OPT1  PM1E)
= YES.
• Cooler Pump 2 Enable (Configuration  OPT1  PM2E)
= NO.
With a single integral pump, the Cooler Pump Starter will be ener-
gized when the machine is occupied. As part of the factory-in-
stalled package, an auxiliary set of contacts is wired to the MBB to
serve as Chilled Water Pump Interlock. When the mechanical
cooling is called for, the pump interlock and flow switch is
checked. If the circuits are closed, the machine starts its capacity
routine. If the auxiliary contact interlock does not close within 25
seconds of the ON command, a T190 — Cooler Pump 1 Aux
Contacts Failed to Close at Start-Up Alert will be generated and
the pump shut down. The unit will not
chilled water flow switch does not close within one (1) minute,
two alarms will be generated. A T192 — Cooler Pump 1 Failed to
Provide Flow at Start-Up Alert and an A200 — Cooler Flow/In-
terlock Failed to Close at Start-Up Alarm will be generated and
chiller will not be allowed to start.
If the chilled water flow switch opens for at least 3 seconds after
initially being closed, a T196 — Flow Lost While Pump 1 Run-
ning Alert and an A201 — Cooler Flow/Interlock Contacts
41
be allowed to start. If the