Carrier PIC 5+ User Manual page 39

Alarm
Description of the alarm text Reset type
code*
Alm-266 ALM-266 Protective Limit - IOB
Low Voltage
Alm-267 ALM-267 Protective Limit -
Guide Vane 1 Fault
Alm-268 ALM-268 Protective Limit -
Damper Valve Fault
Alm-269 ALM-269 Protective Limit -
Envelope Control Valve Fault
Alm-270 ALM-270 Protective Limit - High
Cond Water Flow
Alm-271 ALM-271 Protective Limit -
Emergency Stop
Alm-272 ALM-272 Protective Limit - ISM
Config Conflict
Alm-273 ALM-273 Protective Limit - Swift
Restarts Limit Exceeded
Alm-274 ALM-274 Protective Limit –
Chiller Lockout
Alm-275 ALM-275 Protective Limit – Fire
Alarm
Alm-276 ALM-276 Protective Limit –Stop
Override
Alm-277 Protective Limit - UI Freeze
Reboot
Alm-278 Protective Limit - VFD Config
Conflict
Alm-279 Protective Limit - VFD Config
Failure
Alm-280 ALM-282 Protective Limit – High
VFD Speed
Alm-282 ALM-282 Protective Limit -
Displacement Switch
Alm-283 ALM-283 Protective Limit - High
Pressure Switch
Alm-284 ALM-284 Protective Limit -
Power Feedback Loss
Alm-285 ALM-285 Protective Limit - Low
Bearing Delta Pres Difference
Alm-286 Protective Limit - Low Liquid
Level in High Float VLV
Alm-290 ALM-290 Protective Limit –
Long Time Purge Active
Alm-291 ALM-291 Protective Limit –
Drainage System Failure
Alm-292 ALM-292 Protective Limit -
Guide Vane 2 Fault
Alm-293 ALM-293 Protective Limit - Low
Ref Pump Pressure Difference
Alm-294 ALM-294 Protective Limit - High
Ref Filter Pressure Difference
Alm-295 ALM-295 Protective Limit - High
Bearing Refrig Supply Temp
Alm-296 ALM-296 Protective Limit - High
Evaporator Pressure
Alm-298 ALM-297 Protective Limit - Low
Bearing Refrig Supply Subcooling
Action taken by the
control
Automatic As above
Manual As above
Manual As above
Manual As above
Manual As above
Automatic As above
Automatic As above
Manual As above
Automatic As above
Automatic As above
Manual As above
Manual Same as above
Manual Same as above
Manual Same as above
Manual As above
Manual As above
Manual As above
Manual As above
Manual As above
Manual Same as above
Manual As above
Manual As above
Manual As above
Manual As above
Manual As above
Manual As above
Manual As above
Manual As above
Possible cause
Check IOB 24VAC power supply and the transformer output voltage
Alarm before start indicates guide vane opening has not closed to
less than 4%.
Alarm while running indicates guide vane position is < -1% or > 103%.
Enter Quick Calibration and conduct Guide Vane Calibration.
Check wiring between the guide vane feedback potentiometer and
IOB terminals.
Check the ohm guide vane position feedback potentiometer or 4-20mA
current
Check damper valve wirings
Check Envelope Control valve wirings
Check condenser water pressure sensor and wirings
Check EMSTOP command form network and the remote stop dry
contact from IOB
Configuration data in controller and ISM are mismatch.
In maintains menu, choose "maintains ISM config" ->"Delete ISM
config"
NO – upload ISM configuration data to HMI
YES– download ISM configuration to ISM
Check the reason why swift restart happens so frequently.
Check chiller lockout input in IOB
Check fire alarm input in IOB
Check stop override point status in GENUNIT table
Power on reset PIC 5+ controller
Reset shall be automatic when the communication comes back to
normal
Check VFD Configurations and save it again
Check VFD actual speed
Check impeller displacement switch for NGC chiller
Check high pressure switch for NGC chiller
Check Power Feedback Input
Check if the filter of refrigerant pump inlet is clogged. If clogged, please
replace that filter.
Check if refrigerant pump works. If pump fails, please replace refrigerant
pump.
Check if high float chamber has liquid. If no liquid, please wait until chiller
automatically charge refrigerant into high float chamber.
Check if bearing filter is clogged. If clogged, please replace bearing filter
Reset shall be manual
Check if there's large leak on chiller.
Check if purge vacuum pump fails. If it fails, please replace this vacuum
pump.
Check if purge drain filter is clogged. If clogged, please replace that
filter.
Check if refrigerant pump can't work. If refrigerant pump fails, please
replace this pump
Alarm before start indicates guide vane opening has not closed to
less than 4%.
Alarm while running indicates guide vane position is < -1% or > 103%.
Enter Quick Calibration and conduct Guide Vane Calibration.
Check wiring between the guide vane feedback potentiometer and
IOB terminals.
Check the 4-20mA current
Check refrigerant pump
Check refrigerant pump wiring
Check refrigerant filter
Check refrigerant filter wiring
Check bearing refrig supply temperature sensor
Check evaporator pressure sensor input
And check evaporator pressure cutout configurations
Check bearing inlet pressure sensor input
And check bearing ref supply temperature sensor
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