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51
Table 29 Alarm and Alert Codes (cont)
ALARM/
ALERT
CODE
ALARM
OR
ALERT
DESCRIPTION
WHY WAS THIS
ALARM
GENERATED?
ACTION TAKEN
BY CONTROL
RESET
METHOD
PROBABLE
CAUSE
A150
Alarm Emergency Stop CCN emergency stop
command received
Chiller shutdown
without going
through pumpdown.
Automatic once
CCN command for
EMSTOP returns
to normal
CCN Network
command.
A151
Alarm Illegal Configuration One or more of the ille-
gal configurations
exists.
Chiller is not
allowed to start.
Manual once con-
figuration errors
are corrected
Configuration
error. See Note on
page 52.
A152
Alarm Unit Down Due to
Failure
Both circuits are down
due to alarms/alerts.
Chiller is unable
to run.
Automatic once
alarms/alerts are
cleared that pre-
vent the chiller
from starting.
Alarm notifies user
that chiller is100%
down.
T153
Alert Real Time Clock
Hardware Failure
Internal clock on MBB
fails
Occupancy sched-
ule will not be used.
Chiller defaults to
Local On mode.
Automatic when
correct clock con-
trol restarts.
Time/Date/Month/
Day/Year not prop-
erly set.
A154
Alarm Serial EEPROM
Hardware Failure
Hardware failure with
MBB
Chiller is unable
to run.
Manual Main Base Board
failure.
T155
Alert Serial EEPROM
Storage Failure
Configuration/storage
failure with MBB
No Action Manual Potential failure of
MBB. Download
current operating
software. Replace
MBB if error
occurs again.
A156
Alarm Critical Serial
EEPROM Storage
Failure
Configuration/storage
failure with MBB
Chiller is not
allowed to run.
Manual Main Base Board
failure.
A157
Alarm A/D Hardware
Failure
Hardware failure with
peripheral device
Chiller is not
allowed to run.
Manual Main Base Board
failure.
T170
Alert Loss of Communica-
tion with CXB
MBB loses communica-
tion with CXB
Compressors A3,
A4 and B3 and
unloaders A2/B2
unable to operate.
Automatic Wiring error, faulty
wiring or failed
CXB module.
A172
Alarm Loss of Communica-
tion with EXV
MBB loses communica-
tion with EXV
Chiller shutdown
without going
through pumpdown.
Automatic Wiring error, faulty
wiring or failed
EXV module.
T173
Alert Loss of Communica-
tion with EMM
MBB loses communica-
tion with EMM
4 to 20 mA tempera-
ture reset disabled.
Demand Limit set to
100%. 4 to 20 mA
set point disabled.
Automatic Wiring error, faulty
wiring or failed
Energy Manage-
ment Module
(EMM).
T174
Alert 4 to 20 mA Cooling
Set Point Input Fail-
ure
If configured with EMM
and input less than
2 mA or greater than
22 mA
Set point function
disabled. Chiller
controls to CSP.1.
Automatic Faulty signal gen-
erator, wiring
error, or faulty
EMM.
T176
Alert 4 to 20 mA Tempera-
ture Reset Input
Failure
If configured with EMM
and input less than
2 mA or greater than
22 mA
Reset function dis-
abled. Chiller
returns to normal
set point control.
Automatic Faulty signal gen-
erator, wiring
error, or faulty
EMM.
T177
Alert 4 to 20 mA Demand
Limit Input Failure
If configured with EMM
and input less than
2 mA or greater than
22 mA
Demand limit func-
tion disabled. Chiller
returns to 100%
demand limit
control.
Automatic Faulty signal gen-
erator, wiring
error, or faulty
EMM.
A200
Alarm Cooler Pump Inter-
lock Failure to Close
at Start-Up
Interlock not closed
within 5 minutes after
unit is started
Cooler pump shut
off. Chiller shutdown
without going
through pumpdown.
Manual Failure of cooler
pump, flow switch,
or interlock.
A201
Alarm Cooler Pump Inter-
lock Opened During
Normal Operation
Interlock opens during
operation
Cooler pump shut
off. Chiller shutdown
without going
through pumpdown.
Manual Failure of cooler
pump, flow switch,
or interlock.
A202
Alarm Cooler Pump Inter-
lock Closed When
Pump is Off
If configured for cooler
pump control and inter-
lock closes while cooler
pump relay is off
Chiller is not
allowed to start.
Manual Failure of cooler
pump relay or
interlock, welded
contacts.