Carrier 48LC Series Controls, Start-Up, Operation And Troubleshooting page 32

temperature coupled with dirty outdoor coil, plugged filter drier, or
ODF speeds being set too low.
Alert A315 – CIR.A LOW DISCHARGE
This alert occurs when the discharge pressure is less than the OAT
plus the configured LOW DISCHARGE LEV amount. This alert
resets automatically. The control will add a strike for which ever
compressors were on. The cause of the alert is usually an
undercharged system, low outdoor ambient temperature coupled
with dirty outdoor coil, plugged filter drier, or ODF speeds being
set too high.
Alert A316 – CIR.A LOW SUCTION
This alert occurs when the compressor is operating and the
evaporating temperature (converted from the suction pressure) is
less than configured low suction control levels, LOW SUC
LEVEL 1, LOW SUC LEVEL2, or LOW SUC LEVEL3. The
circuit SST value must be less than LOW SUC LEVEL 1 (for 5
minutes), LOW SUC LEVEL 2 (for 4 minutes), or LOW SUC
LEVEL 3 (for 3 minutes when using the economizer and 1.5
minutes when not using the economizer) for the alert to occur.
When the outdoor temperature is less than 40_F, the above values
are reduced 1_F for every 2_F OAT is below 40_F. All the above
timers will reset if the suction temperature rises above LOW SUC
OK TEMP for 1 minute. This alert causes a strike for the respective
circuit. This alert will activate when the coil becomes frosted.
However, during the 15- -minute reset period, the coils will thaw
and strike should clear and restart if there is nothing else wrong
with the circuit. The alert resets automatically. The cause of the
alert is usually low refrigerant charge, dirty filters, evaporator fan
operating backwards, loose or broken belt, plugged filter drier,
faulty transducer, excessively cold return air, or stuck open
economizer when the ambient temperature is low.
Alert A317 – CIR.A LOW DISCHARGE
This alert occurs when the Circuit A pressure ratio is less than the
configured MIN PRESSURE RATIO amount. This alert resets
automatically. The control will add a strike for which ever
compressors were on. The cause of the alert is usually an
undercharged system, low outdoor ambient temperature coupled
with dirty outdoor coil, plugged filter drier, or ODF speeds being
set too high.
Fault F318 – COMPRESSOR STUCK ON
This alert occurs when the Suction pressure does not raise the
minimum suction amount (CIR.A MIN SUC.P ) and the ratio did
not fall at least the off pressure ratio (OFF P.RATIO). When this
occurs, the control turns off all of the compressors, and enters a
safety shutdown condition. The possible causes are a welded
contactor or frozen compressor relay on MBB. Manual alarm reset
or power cycle is required to rest this fault.
Fault F319 – C.A1 DOWN DUE TO FAIL
This fault occurs when compressor A1 has 3 strikes. Investigate the
alerts that caused the strikes to occur, and correct or test as needed.
Manual alarm reset or power cycle is required to rest this fault.
Alert A320 – C.A1 REVERSE ROTATION
This alert occurs when 10 seconds after the compressor turns on,
the suction rose and the discharge pressure dropped. This alert
causes a strike for the compressor. The alert resets automatically.
The cause of the alert is usually compressor wiring causing reverse
rotation or a faulty compressor.
Alert A321 – C.A1 FAIL TO PRESSURE
This alert occurs when 10 seconds after the compressor turns on,
the suction did not drop more that suction amount (CIR.A MIN
SUC.P) and discharge pressure did not rise more than discharge
amount (CIR.A MIN DIS.P). This alert causes a strike for the
compressor. The alert resets automatically. The cause of the alert is
usually compressor wiring causing reverse rotation or a faulty
compressor.
Fault F322 – C.A2 DOWN DUE TO FAIL
This fault occurs when compressor A2 has 3 strikes. Investigate the
alerts that caused the strikes to occur, and correct or test as needed.
Manual alarm reset or power cycle is required to rest this fault.
Alert A323 – C.A2 REVERSE ROTATION
This alert occurs when 10 seconds after the compressor turns on,
the suction rose and the discharge pressure dropped. This alert
causes a strike for the compressor. The alert resets automatically.
The cause of the alert is usually compressor wiring causing reverse
rotation or a faulty compressor.
Alert A324 – C.A2 FAIL TO PRESSURE
This alert occurs when 10 seconds after the compressor turns on,
the suction did not drop more that suction amount (CIR.A MIN
SUC.P) and discharge pressure did not rise more than discharge
amount (CIR.A MIN DIS.P). This alert causes a strike for the
compressor. The alert resets automatically. The cause of the alert is
usually compressor wiring causing reverse rotation or a faulty
compressor.
Alert A410 – IGC IGNITION FAILURE
This alert occurs when the IGC fan request does not activate 15
minutes after turning heat 1 on when configured for Gas Heat. The
control will lockout all the heat stages. This alert will automatically
reset after the IGC fan request occurs. The cause of this alert is
usually faulty wiring of the IGC, no gas flow, or wrong
configuration.
Fault F411 – ROLLOUT WITHOUT HEAT
This fault occurs when the IGC fan request activates and the heat
has been off for at least 3 minutes when configured for Gas Heat.
The control will enter the safety shutdown condition. This alert
will automatically reset after the IGC fan request turns off for 10
minutes. The cause of this alert is usually faulty wiring of the IGC,
or rollout switch trip without a heat call.
Fault F412 – RUN AWAY HEAT
This fault occurs when the SAT rises above the maximum SAT.
The control will enter the safety shutdown condition. This alert
will automatically reset after if configured to and the SAT falls 50
degrees below the maximum SAT. The cause of this alert is usually
heat stuck on causing high SAT, or low air flow.
Alert A510 – INDOOR FAN STATUS
This alert occurs when the unit is configured not to shut down on
fan status and either the fan is requested off and the fan speed
feedback does not reach zero in the VFD deceleration time or the
fan is requested greater than zero and the fan speed feedback does
not reach that speed in the VFD acceleration time. This alert will
reset automatically. The cause of this alert is usually belt broke,
motor failure, or configuration error.
Fault F511 – IDF OFF WHEN COMMAND ON
This fault occurs when the unit is configured to shut down on fan
status and the fan is requested greater than zero and the fan speed
feedback does not reach that speed in the VFD acceleration time.
The cause of this alert is usually Fan stuck on, or Configuration
incorrect. Manual alarm reset or power cycle is required to rest this
fault.
Fault F512 – IDF ON WHEN COMMAND OFF
This fault occurs when the unit is configured to shut down on fan
status and the fan is requested off and the fan speed feedback does
not reach zero in the VFD deceleration time. The cause of this alert
is usually tripped circuit breaker, broken belt, bad indoor fan
motor, or configuration incorrect. Manual alarm reset or power
cycle is required to rest this fault.
Fault F600 – IDF VFD COMMUNICATION
This fault occurs when the indoor fan VFD and the SystemVut
control are not communicating properly. This will cause a unit
shutdown, and will automatically reset when communication is
properly restored. The cause of this is usually a break in the
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