Table 3-2 Alarm Codes - Carrier GR-45 Operation And Service

ALARM TITLE
NO.
A11 Coil Freeze
A12 High Voltage
A13 Low Voltage
A14 Return Air Probe Failure
A15 Suction Pressure
Transducer Failure
A16 Discharge Pressure
Transducer Failure
A17 Low Pressure Shutdown
A21 High Discharge Pressure

Table 3-2 Alarm Codes

CAUSE
Coil temperature is Check causes of coil
less than 32F and the freezing. (Refer to
compressor is operat- section 3.3.6)
ing.
The battery voltage is Check, repair or re-
greater than 32 volts. place alternator.
The battery voltage is Check, repair or re-
less than 17 volts. place wiring or alter-
nator.
Return air temperature Ensure all connectors
sensor failure or wir- are plugged in. Check
ing defective. sensor resistance or
wiring. Refer to para-
graph 4.21. Replace
sensor or repair wir-
ing.
Suction pressure Ensure all connectors
transducer failure or are plugged in. Check
wiring defective. sensor voltage or wir-
ing. Replace sensor or
repair wiring.
Discharge pressure Ensure all connectors
transducer failure or are plugged in. Check
wiring defective. sensor voltage or wir-
ing. Replace sensor or
repair wiring.
Low suction pressure Check cause of low
switch open or wiring suction pressure. (Re-
defective. fer to section 3.5.3)
High discharge pres- Check discharge pres-
sure switch open or sure transducer read-
wiring defective. ing, wiring or cause of
high discharge pres-
sure. (Refer to section
3.3.3)
3-2
REMEDY CONTROLLER
RESPONSE
An alarm will be gener-
ated and the system will
shutdown. The evapora-
tor fans will remain run-
ning while the compres-
sor is off.
The system is shut down
until the voltage returns
to normal levels.
The system is shut down
until the voltage returns
to normal levels.
All outputs except the
evaporator fans will be
de-energized.
Both unloaders are ener-
gized.
One unloader is ener-
gized.
The clutch is de-ener-
gized for the minimum
off time. The evaporator
fans will remain running
during this period. After
the compressor cycles
off three times in 30
minutes all outputs will
be de-energized and the
system is locked out un-
til the power is cycled or
the alarm is reset.
The clutch is de-ener-
gized for the minimum
off time. The condenser
and evaporator fans will
remain running during
this period. After the
compressor cycles off
three times in 30 min-
utes all outputs will be
de-energized and the
system is locked out un-
til the power is cycled or
the alarm is reset.
T--295