Table 27 — Alarm and Alert Codes (cont)
ALARM/
ALEERT
CODE
ALARM OR
ALERT
DESCRIPTION
WHY WAS THIS
ALARm
GENERATED?
ACTION TAKEN
BY CONTROL
RESET
METHOD
PROBABLE
CAUSE
203 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.
204 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.
206 Alert High Leaving Chilled
Water Temperature
LWT read is greater
than LCW Alert Limit,
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.
207 Alarm Cooler Freeze Protec-
tion
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.
208 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 con-
trol enabled).
Manual Faulty cooler pump,
low water flow, plugged
fluid strainer.
950 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.
951 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.
LEGEND
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
MBB — Main Base Board
MOP — Maximum Operating Pressure
WSM — Water System Manager
*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/CSP.2
−8° F (4.4 C) for dual set point configuration.
NOTE: The following table shows illegal configurations:
1 Zero compressors in a circuit
2 Four compressors in a circuit with two unloaders
3
Four compressors in a circuit with one unloader and hot gas
bypass
4 Two unloaders and hot gas bypass in a circuit.
5 More than one compressor quantity difference between circuits
6 Fluid type of low temperature brine
7
Air cooled head pressure control with common fan staging and
different head pressure control methods for each circuit.
51
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