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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 (PM.P.S) [Configuration,
UNIT] must be set to YES. This option is set to NO as the fac-
tory default. With this feature enabled, if the pump is not oper-
ating, 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 inte-
gral pump package, the following options must be configured:
• Cooler Pump Control (CPC) [Configuration, OPT1] ON.
• Cooler Pump 1 Enable (PM1E) [Configuration, UNIT]
YES
• Cooler Pump 2 Enable (PM2E) [Configuration, UNIT]
YES
Pump Start Selection is a field-configurable choice. Cooler
Pump Select (PM.SL) [Configuration, UNIT] is factory de-
faulted 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 (Auto-
matic), 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 (PM.DT) [Configuration, UNIT] is reached. The Lead
Pump (LD.PM) [Run Status, VIEW] 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
interlock and flow switch are checked. If the circuits are closed,
the machine starts its capacity routine. If Pump 1 starts and 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 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 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/Interlock failed to close at Start-Up
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
Running Alert or T197 — Flow Lost While Pump 2 Running
Alert for the appropriate pump and an A201 — Cooler Flow/
Interlock Contacts 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 the chilled water pump interlock opens for 25 seconds
after initially being closed is detected by the control, the appro-
priate T194 – Cooler Pump 1 Contacts Opened During Normal
Operation 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 machine 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 appropriate 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 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.
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 nuisance alarm.
With Cooler Pump Select (PM.SL) [Configuration, UNIT]
set to 0 (Automatic) and when the differential time limit Pump
Changeover Hours (PM.DT) [Configuration, UNIT] is reached,
the lead pump will be turned OFF. Approximately one (1) sec-
ond later, the lag pump will start. Manual changeover can be ac-
complished by changing Rotate Cooler Pump Now (ROT.P)
[Configuration, UNIT] to YES only if the machine is at Capac-
ity Stage 0 and the differential time limit Pump Changeover
Hours (PM.DT) [Configuration, UNIT] 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 automati-
cally as part of the normal routine.
With Cooler Pump Select (PM.SL) [Configuration, UNIT]
set to 1 (Pump 1 Starts First) or 2 (Pump 2 Starts First), a manual
changeover can be accomplished by changing PM.SL only. The
machine Remote-Off-Enable Switch must be in the OFF posi-
tion to change this variable. The Rotate Cooler Pump Now
(ROT.P) [Configuration, UNIT] feature does not work for these
configuration options.