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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
T093 Alert Circuit B Suction
Pressure Transducer
Failure
Voltage ratio more than
99.9% or less than .5%.
Circuit B shut down Automatic Transducer failure, poor
connection to MBB, or wiring
damage/error.
T110 Alert Circuit A Loss of Charge If the compressors are off
and discharge pressure
reading is < 10 psig for
30 sec.
Circuit not allowed to
start.
Manual Refrigerant leak or
transducer failure
T111 Alert Circuit B Loss of Charge If the compressors are off
and discharge pressure
reading is < 10 psig for
30 sec.
Circuit not allowed to
start.
Manual Refrigerant leak or
transducer failure
T112 Alert Circuit A High Saturated
Suction Temperature
Circuit saturated suction
temperature pressure
transducer > 60 F (15.6 C)
for 5 minutes
Circuit shut down Manual Faulty Expansion valve,
faulty suction pressure
transducer or high entering
fluid temperature.
T113 Alert Circuit B High Saturated
Suction Temperature
Circuit saturated suction
temperature pressure
transducer > 60 F (15.6 C)
for 5 minutes
Circuit shut down Manual Faulty Expansion valve,
faulty suction pressure
transducer or high entering
fluid temperature.
T114 Alert Circuit A Low Suction
Superheat
Return gas sensor enabled
and suction superheat is
more than 10° F (5.6 C)
below the suction superheat
set point for 5 minutes.
Circuit A shut down after
pumpdown complete.
Automatic restart
after first daily
occurrence.
Manual restart
thereafter.
Faulty expansion valve,
faulty suction pressure
transducer, faulty suction gas
thermistor, circuit
overcharged
T115 Alert Circuit B Low Suction
Superheat
Return gas sensor enabled
and suction superheat is
more than 10° F (5.6 C)
below the suction superheat
set point for 5 minutes.
Circuit B shut down after
pumpdown complete.
Automatic restart
after first daily
occurrence.
Manual restart
thereafter.
Faulty expansion valve,
faulty suction pressure
transducer, faulty suction
gas thermistor, circuit
overcharged
T116 Alert Circuit A Low Cooler
Suction Temperature
Mode 7 caused the com-
pressor to unload 6 consecu-
tive times with less than a
30-minute interval between
each circuit shutdown.
Circuit shut down Manual Faulty expansion valve, low
refrigerant charge, plugged
filter drier, faulty suction
pressure transducer, low
cooler fluid flow
T117 Alert Circuit B Low Cooler
Suction Temperature
Mode 8 caused the com-
pressor to unload 6 consecu-
tive times with less than a
30-minute interval between
each circuit shutdown.
Circuit shut down Manual Faulty expansion valve, low
refrigerant charge, plugged
filter drier, faulty suction
pressure transducer, low
cooler fluid flow
T126 Alert Circuit A High
Discharge Pressure
SCT >Maximum condensing
temperature from operating
envelope
Circuit shut down Automatic, only
after first 3 daily
occurrences.
Manual reset
thereafter. Read-
ing from OAT sen-
sor (T9) must drop
5 F (2.8 C) before
restart
Faulty transducer/high
pressure switch, low/
restricted condenser
airflow
T127 Alert Circuit B High
Discharge Pressure
SCT >Maximum condensing
temperature from operating
envelope
Circuit shut down Automatic, only
after first 3 daily
occurrences. Man-
ual reset thereafter.
Reading from OAT
sensor (T9) must
drop 5 F (2.8 C)
before restart
Faulty transducer/high
pressure switch, low/
restricted condenser
airflow
T133 Alert Circuit A Low Suction
Pressure
Suction pressure below
15 psig for 8 seconds or
below 8 psig
Circuit shut down Automatic
restart after first
daily occurrence.
Manual restart
thereafter.
Faulty or plugged TXV, low
refrigerant charge, TXV out
of adjustment, liquid
line valve partially closed
T134 Alert Circuit B Low Suction
Pressure
Suction pressure below
15 psig for 8 seconds or
below 8 psig
Circuit shut down Automatic
restart after first
daily occurrence.
Manual restart
thereafter.
Faulty or plugged TXV, low
refrigerant charge, TXV out
of adjustment, liquid
line valve partially closed