52
Table 29 — Alarm and Alert Codes (cont)
LEGEND
*Freeze is defined as 34° F (1.1 C) for water. For brine fluids, freeze
is CSP.1 –8° F (4.4 C) for single set point and lower of CSP.1 or
CSP.2 –8° F (4.4 C) for dual set point configuration.
NOTE: The following table shows illegal configurations:
ALARM/
ALERT
CODE
ALARM
OR
ALERT
DESCRIPTION
WHY WAS THIS
ALARM
GENERATED?
ACTION TAKEN
BY CONTROL
RES
METHOD
PROBABLE
CAUSE
T203
Alert Loss of Communica-
tion with Slave Chiller
Master MBB loses
communication with
Slave MBB
Dual chiller control dis-
abled. Chiller runs as a
stand-alone machine.
Automatic Wiring error, faulty wir-
ing, failed Slave MBB
module, power loss at
Slave chiller, wrong
slave address.
T204
Alert Loss of Communica-
tion with Master Chiller
Slave MBB loses com-
munication with Master
MBB
Dual chiller control dis-
abled. Chiller runs as a
stand-alone machine
Automatic Wiring error, faulty wir-
ing, failed Master MBB
module, power loss at
Master chiller.
T205
Alert Master and Slave
Chiller with Same
Address
Master and slave chiller
have the same CCN
address (CCN.A)
Dual chiller routine dis-
abled. Master/slave run
as stand-alone chillers.
Automatic CCN Address for both-
chillers is the same.
Must be different.
Check CCN.A under
the OPT2 sub-mode in
configuration at both
chillers.
T206
Alert High Leaving Chilled
Water Temperature
LWT read is greater
than LCW Alert Limit,
plus control point and
Total capacity is 100%
and LWT is greater
than LWT reading one
minute ago
Alert only. No action
taken.
Automatic Building load greater
than unit capacity, low
water/brine flow or
compressor fault.
Check for other
alarms/alerts.
A207
Alarm Cooler Freeze
Protection
Cooler EWT or LWT is
less than freeze*
Chiller shutdown with-
out going through
pumpdown. Cooler
pump continues to run
(if control enabled).
Automatic for
first occurrence
of day. Manual
reset thereafter.
Faulty thermistor (T1/
T2), low water flow.
A208
Alarm Low Cooler Fluid Flow Cooler EWT is less
than LWT by 3° F
(1.7° C) for 1 minute
after a circuit is started
Chiller shutdown with-
out going through
pumpdown. Cooler
pump shut off (if control
enabled).
Manual Faulty cooler pump,
low water flow, plugged
fluid strainer.
T950
Alert Loss of Communica-
tion with WSM
No communications
have been received by
MBB within 5 minutes
of last transmission
WSM forces removed.
Chiller runs under own
control.
Automatic Failed module, wiring
error, failed trans-
former, loose connec-
tion plug, wrong
address.
T951
Alert Loss of Communica-
tion with FSM
No communications
have been received by
MBB within 5 minutes
of last transmission
FSM forces removed.
Chiller runs under own
control.
Automatic Failed module, wiring
error, failed trans-
former, loose connec-
tion plug, wrong
address.
CCN —
Carrier Comfort Network
CPCS —
Compressor Protection Control System
CXB —
Compressor Expansion Board
EMM —
Energy Management Module
EXV —
Electronic Expansion Valve
FSM —
Flotronic™ System Manager
LCW —
Leaving Chilled Water
LWT —
Leaving Fluid Temperature
MBB —
Main Base Board
MOP —
Maximum Operating Pressure
WSM —
Water System Manager
1
Unit type = 0.
2
4 Compressors in a circuit with 2 unloaders.
3
4 Compressors in a circuit with 1 unloader and hot gas
bypass.
4
2 Unloaders and hot gas bypass in a circuit.
5
More than one compressor difference between circuits (e.g., 4
compressors in Ckt A, 2 in Ckt B).
6
Water cooled units with optional thermistors and configured
for head pressure control.
7
Split system chillers with optional thermistors and configured
for head pressure control.
8
Low temperature brine selected for air cooled chillers or split
systems with air cooled head pressure control.
9
Water cooled unit configured for air cooled head pressure
control.
10
Air cooled head pressure control with common fan staging
and different head pressure control methods for each circuit
(EXV controlled vs. set point controlled).
11
Lead/lag enabled, Master selected and Cooling Set Point
select is LWT POT.
12
Water cooled or split units (units types 2, 3, 4) with more than
one compressor on a circuit.
13
Condenser pump interlock enabled on air cooled unit.
14
Unit type changed.
15
Low pressure set points out of range.
16
Cooler fluid type is water and ice mode is enabled.
