Dual Integral Pump Control - Carrier AquaSnap 30RAP011-060 Controls, Start-Up, Operation, Service, And Troubleshooting

Opened During Normal Operation Alarm will be generated and
the machine will stop.
If the control detects the chilled water pump interlock open for 25
seconds after initially being closed, a T194 — Cooler Pump 1
Contacts Opened During Normal Operation Alert is generated and
the unit is shut down.
If the control detects the chilled water flow switch circuit closed
for at least 5 minutes with the pump output OFF, an A202 —
Cooler Pump Interlock Closed When Pump is Off Alarm will be
generated and the unit will not be allowed to start.
If the control detects that the chilled water pump auxiliary contacts
are closed for at least 25 seconds while the pump is OFF, a T198
— Cooler Pump 1 Aux Contacts Closed While Pump Off Alert is
generated. The chiller will not be allowed to start.
If the control starts a pump and the wrong interlock circuit closes
for at least 20 seconds, an A189 — Cooler Pump and Aux Contact
Input Miswire Alarm will be generated. The unit will be prevented
from starting.
As part of a pump maintenance routine, the pump can be started to
maintain lubrication of the pump seal. To utilize this function,
Cooler Pmp Periodic Start (Configuration  OPT1  PM.P.S)
must be set to YES. This option is set to NO as the factory default.
With this feature enabled, if the pump is not operating, it will be
started and operated for 2 seconds starting at 14:00 hours. If the
pump is operating, this routine is skipped. If the pump has failed
and an Alarm/Alert condition is active, the pump will not start that
day.

DUAL INTEGRAL PUMP CONTROL

With a dual integral pump package, 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)
= YES.
Pump Start Selection is a field-configurable choice. Cooler Pump
Select (Configuration  OPT1  PM.SL) is factory defaulted to
0 (Automatic). This value can be changed to 1 (Pump 1 Starts
First) or 2 (Pump 2 Starts First). If PM.SL is 0 (Automatic), the
pump selection is based on two criteria: the alert status of a pump
and the operational hours on the pump. If a pump has an active
Alert condition, it will not be considered for the lead pump. The
pump with the lowest operational hours will be the lead pump. A
pump is selected by the control to start and continues to be the lead
pump until the Pump Changeover Hours (Configura-
tion  OPT1  PM.DT) is reached.
The Lead Pump (Run Status  VIEW  LD.PM) indicates the
pump that has been selected as the lead pump: 1 (Pump 1), 2
(Pump 2), 3 (No Pump). The Pump Changeover Hours is factory
defaulted to 500 hours. Regardless of the Cooler Pump Selection,
any pump that has an active alert will not be allowed to start.
With the dual integral pump package, the Cooler Pump Starter
will be energized when the machine is in an occupied period. As
part of the factory-installed package, an auxiliary set of contacts is
wired to the MBB to serve as Chilled Water Pump Interlock, one
set for each pump to individual channels on the MBB. With a call
for mechanical cooling, the specific pump
switch are checked. If the circuits are closed, the machine starts its
capacity routine. If Pump 1 starts and the auxiliary contact inter-
lock 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
be allowed to start. If the chilled water flow switch does not close
within 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/Interlock Failed to Close at Start-Up Alarm will be
generated and chiller will not be allowed to start. In either fault
case listed above, Pump 2 will be commanded to start once Pump
1 has failed.
If Pump 2 starts and the auxiliary contact interlock does not close
within 25 seconds of the ON command, a T191 — Cooler Pump 2
Aux Contacts Failed to Close at Start-Up Alert will be generated
and the pump shut down. The unit will not be allowed to start. If
the chilled water flow switch does not close within one (1) minute,
two alarms will be generated. A T193 — Cooler Pump 2 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. In either fault case listed above,
Pump 1 will be commanded to start once Pump 2 has failed.
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 or T197 — Flow Lost While Pump 2 Running Alert for
the appropriate pump and an A201 — Cooler Flow/Interlock Con-
tacts Opened During Normal Operation Alarm will be generated
and the machine will stop. If available, the other pump will be
started. If flow is proven, the machine will be allowed to restart.
If a chilled water pump interlock that opens for 25 seconds after
initially being closed is detected by the control, the appropriate
T194 — Cooler Pump 1 Contacts Opened During Normal Opera-
tion Alert or T195 — Cooler Pump 2 Contacts Opened During
Normal Operation Alert is generated and the unit is shut down. If
available, the other pump will be started. If flow is proven, the ma-
chine will be allowed to restart.
If the control detects that the chilled water flow switch circuit is
closed for at least 5 minutes with the pump output OFF, an A202
— Cooler Pump Interlock Closed When Pump is Off Alarm will
be generated and the unit will not be allowed to start.
If the control detects that the chilled water pump auxiliary contacts
are closed for at least 25 seconds while the pump is OFF, the ap-
propriate T198 — Cooler Pump 1 Aux Contacts Closed While
Pump Off or Alert T199 — Cooler Pump 2 Aux Contacts Closed
While Pump Off Alert is generated. The chiller will not be al-
lowed to start.
If the control starts a pump and the wrong interlock circuit closes
for at least 20 seconds, an A189 – Cooler Pump and Aux Contact
Input Miswire Alarm will be generated. The unit will be prevented
from starting.
The control will allow for pump changeover. Two methods will
change the pump sequence. Before the changeover can occur, the
unit must be at Capacity Stage 0. During changeover the chilled
water flow switch input is ignored for 10 seconds to avoid a nui-
sance alarm.
With Cooler Pump Select (Configuration  OPT1  PM.SL) set
to 0 (Automatic) and when the differential time limit Pump
Changeover
reached, the lead pump will be turned OFF. Approximately one
(1) second later, the lag pump will start. Manual changeover can
be accomplished by changing Rotate Cooler Pump Now (Config-
uration  OPT1  ROT.P) to YES only if the machine is at Ca-
pacity Stage 0 and the differential time limit Pump Changeover
Hours (PM.DT) is reached. If the PM.DT is not satisfied, the
changeover will not occur. With the machine at Capacity Stage 0,
the pumps would rotate automatically as part of the normal rou-
tine.
With Cooler Pump Select (PM.SL) set to 1 (Pump 1 Starts First)
interlock and flow
or 2 (Pump 2 Starts First), a manual changeover can be accom-
plished by changing PM.SL only. The machine Remote-Off-En-
able Switch must be in the OFF position to change this variable.
The Rotate Cooler Pump Now (ROT.P) feature does not work for
these configuration options.
As part of a pump maintenance routine, the pumps can be started
to maintain lubrication to the pump seal. To utilize this function,
Cooler Pmp Periodic Start (Configuration  OPT1  PM.PS)
must be set to YES. This option is set to NO as the factory default.
If feature is enabled and the pump(s) are not operating, then the
42
Hours (Configuration  OPT1  PM.DT) is