Carrier AquaSnap 30MPA Series Controls, Start-Up, Operation, Service, And Troubleshooting page 62

ALARM/ ALARM
ALERT OR
CODE ALERT
4 to 20 mA Demand
T177 Alert
Limit Input Failure
Coder Flow/Interlock
P200 Pre-Alert Contacts Failed to Close
at Start-Up
Cooler Flow/Interlock
T200 Alert Contacts failed to Close
at start-up
Cooler Flow/Interlock
Contacts Opened
P201 Pre-Alert
During Normal
Operation
Cooler Flow/Interlock
Contacts Opened
A201 Alarm
During Normal
Operation
Cooler Pump Interlock
A202 Alarm Closed When Pump is
Off
Loss of Communication
T203 Alert
with slave chiller
Loss of Communication
T204 Alert
with master chiller
Master and slave chiller
T205 Alert
with same address
High Leaving Chilled
T206 Alert
Water Temperature
Cooler Freeze
A207 Alarm
Protection
EWT or LWT
A208 Alarm
Thermistor failure
A220 Alarm Condenser Pump
Interlock Failure to
Close
at Start-Up
P221 Pre-Alert Condenser Pump
Interlock Opened During
Normal Operation
See legend on page 63.
Table 54 — Alarm and Alert Codes (cont)
WHY WAS THIS
DESCRIPTION ALARM
GENERATED?
If configured with EMM and
input less than 2 mA or
greater than 22 mA
Cooler flow switch contacts
failed to close within
1 minute (if cooler pump
control is enabled) or
within 5 minutes (if cooler
pump control is not
enabled) after start-up
Cooler flow switch contacts
failed to close within
1 minute (if cooler pump
control is enabled) or
within 5 minutes (if cooler
pump control is not
enabled) after start-up
Flow switch opens for at
least 3 seconds after
being initially closed
Flow switch opens for at
least 3 seconds after
being initially closed
If configured for cooler
pump control and flow
switch input is closed for
5 minutes while pump
output(s) are off
Master chiller MBB
loses communication
with slave chiller MBB
Slave chiller MBB loses
communication with
master chiller MBB
Master and slave chiller
have the same CCN
address (CCN.A)
LWT read is greater than
LCW Alert Limit, Total
capacity is 100% and LWT
is greater than LWT
reading one minute ago
Cooler EWT or LWT is less
than Brine Freeze (BR.FZ)
Cooler EWT is less than
LWT by 3° F (1.7° C) for
1 minute after a circuit is
started
If configured for con-
denser pump interlock
and the flow switch
input fails to close with-
in 5 minutes after start-
up. Also valid when
configured for con-
denser pump control.
If configured for con-
denser pump interlock
and the flow switch
opens for 15 seconds
during normal
operation (or when
the condenser pump
relay is on when con-
denser pump control
is configured.)
ACTION TAKEN
BY CONTROL
Demand limit function
disabled. Chiller
returns to 100%
demand limit
control.
Chiller not allowed to
start.
Chiller not allowed to
start.
All compressors shut
down.
All compressors shut
down.
Chiller not allowed to
start
Dual chiller control
disabled. Chiller runs
as a stand-alone
machine.
Dual chiller control
disabled. Chiller runs
as a stand-alone
machine
Dual chiller routine
disabled. Master/slave
run as stand-alone
chillers.
Alert only. No action
taken.
Chiller shut down
without going through
pumpdown. Cooler
pump continues to
run a minimum of
5 minutes (if control
enabled).
Chiller shut down.
Cooler pump shut off
(if control enabled).
Condenser and cooler
pumps shut off.
Chiller shut down
Condenser and cooler
pumps shut off. Chiller
shut down
62
RESET PROBABLE
METHOD CAUSE
Faulty signal
Automatic generator, wiring
error, or faulty EMM.
No chilled water flow.
Faulty flow switch or
Manual
interlock. Wiring
error.
No chilled water flow.
Faulty flow switch or
Manual
interlock. Wiring
error.
Cooler pump failure,
faulty flow switch or
Manual
interlock. Wiring
error.
Cooler pump failure,
faulty flow switch or
Manual
interlock. Wiring
error.
Wiring error, faulty
Automatic when
pump contactor
aux contacts open
(welded contacts)
Wiring error, faulty
wiring, failed Slave
chiller MBB module,
Automatic
power loss at slave
chiller, wrong slave
address.
Wiring error, faulty
wiring, failed master
Automatic chiller MBB module,
power loss at Master
chiller.
CCN Address for
both chillers is the
same. Must be
different. Check
Automatic
CCN.A under the
OPT2 sub-mode in
Configuration at both
chillers.
Building load greater
than unit capacity,
low water/brine flow
Automatic
or compressor fault.
Check for other
alarms/alerts.
Both EWT and LWT
must be at least 6 F
(3.3 C) above Brine Faulty thermistor
Freeze point (T1/T2), low water
(BR.FZ). Automatic flow.
for first, Manual reset
there after.
Reverse flow faulty
Manual thermistor, miswired
thermistor
Manual Failure of condenser
pump or controls.
Wiring error.
Manual Failure of condenser
pump or controls.
Wiring error.