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Table 26 — Alarm and Alert Codes (cont)
LEGEND
ALARM/
ALERT CODE
ALARM OR
ALERT
DESCRIPTION WHY WAS THIS ALARM GENERATED?
ACTION TAKEN
BY CONTROL
RESET
METHOD
T110 Alert Circuit A Loss of Charge
If the compressors are off and discharge pressure
reading is less than 26 psig for 30 sec.
Circuit not allowed to start. Manual
T111 Alert Circuit B Loss of Charge
If the compressors are off and discharge pressure
reading is less than 26 psig for 30 sec.
Circuit not allowed to start. Manual
T112 Alert
Circuit A High Saturated
Suction Temperature
Circuit is on and saturated suction temperature is
greater than 70 F (15.6 C) for 5 minutes
Circuit shut down Manual
T113 Alert
Circuit B High Saturated
Suction Temperature
Circuit is on and saturated suction temperature is
greater than 70 F (15.6 C) for 5 minutes
Circuit shut down Manual
T114 Alert
Circuit A Low Suction
Superheat
Suction superheat is less than 5 F (2.8 C)
for 5 minutes.
Circuit A is shut down after
pumpdown complete.
Automatic after first
daily occurance,
manual
thereafter
T115 Alert
Circuit B Low Suction
Superheat
Suction superheat is less than 5 F (2.8 C)
for 5 minutes.
Circuit B is shut down after
pumpdown complete.
Automatic after first
daily occurance,
manual
thereafter
T118 Alert
High Discharge
Gas Temperature
Discharge Thermistor (DTT) reading is
greater than 250 F
Compressor A1 shut down Automatic
A118 Alarm
High Discharge
Gas Temperature
3 Discharge Gas Temperature alarms
occur within a day
Compressor A1 shut down Manual
P120 Alert
Circuit A Low
Saturated Suction
SSTA is less than 20 F for 4 minutes, less than
10 F for 2 minutes, less than 0° F for 1 minute or
less than –20 F for 20 seconds continuously
Circuit A will remove one
compressor stage.
Automatic
T120 Alert
Circuit A Low
Saturated Suction
SSTA is less than 20 F for 4 minutes, less than
10 F for 2 minutes, less than 0° F for 1 minute or
less than –20 F for 20 seconds continuously
Circuit A shut down
Automatic
unless
3rd strike.
A120 Alarm
Circuit A Low
Saturated Suction
SSTA is less than 20 F for 4 minutes, less than
10 F for 2 minutes, less than 0° F for 1 minute or
less than –20 F for 20 seconds continuously and
only one compressor running
Circuit A shut down Manual
P121 Alert
Circuit A Low
Saturated Suction
SSTB is less than 20 F for 4 minutes, less than
10 F for 2 minutes, less than 0° F for 1 minute or
less than –20 F for 20 seconds continuously
Circuit B will remove one
compressor stage.
Automatic
T121 Alert
Circuit B Low
Saturated Suction
SSTB is less than 20 F for 4 minutes, less than
10 F for 2 minutes, less than 0° F for 1 minute or
less than –20 F for 20 seconds continuously and
only one compressor running
Circuit B shut down
Automatic
unless
3rd strike.
A121 Alarm
Circuit B Low
Saturated Suction
SSTB is less than 20 F for 4 minutes, less than
10 F for 2 minutes, less than 0° F for 1 minute or
less than –20 F for 20 seconds continuously and
only one compressor running
Circuit B shut down Manual
T122 Alert
High Pressure Switch
Trip Circuit A
High Pressure A Switch Input opento MBB Circuit shut down Manual
T123 Alert
High Pressure Switch
Trip Circuit B
High Pressure B Switch Input open to MBB Circuit shut down Manual
T126 Alert
Circuit A High
Discharge Pressure
SCTA >150 F Circuit shut down
Automatic, only
after first 3 daily
occurrences.
A126 Alarm
Circuit A High
Discharge Pressure
SCTA >150 F Circuit shut down Manual
T127 Alert
Circuit B High
Discharge Pressure
SCTB >150 F Circuit shut down
Automatic, only
after first 3 daily
occurrences
A127 Alarm
Circuit B High
Discharge Pressure
SCTB >150 F Circuit shut down Manual
A140 Alarm Reverse Rotation Detected Incoming unit power leads not phased correctly Unit shut down. Manual
A150 Alarm Emergency Stop CCN emergency stop command received
Unit shutdown without going
through pumpdown.
Automatic once
CCN command for
EMSTOP returns
to normal
A151 Alarm Illegal Configuration One or more illegal configurations exists. Unit is not allowed to start.
Manual once
configuration errors
are corrected
A152 Alarm Unit Down Due to Failure Both circuits are down due to alarms/alerts. Unit is unable to run.
Automatic once
alarms/alerts are
cleared that prevent
the chiller from
starting.
CCN — Carrier Comfort Network
®
LWT — Leaving Fluid Temperature
CSB — Current Sensor Board MBB — Main Base Board
CXB — Compressor Expansion Module SCT — Saturated Condensing Temperature
DTT — Discharge Temperature Thermistor SST — Saturated Suction Temperature
EEPROM — Electrically Erasable Programmable
Read-Only Memory
TSTAT — Thermostat
EMM — Energy Management Module