70
JOHNSON CONTROLS
FORM 150.68-ICOM1
ISSUE DATE: 10/15/2020
PROBLEM
POSSIBLE CAUSE
ACTION
SYS X HIGH DSCH PRES
displayed
Discharge pressure cut-out incorrectly
set.
Adjust in accordance with recommended
setting.
Poor airflow through the condenser coils.
Check for airflow restrictions caused by
blockages on intake faces of air coils.
Check for damage fins.
Condenser fans not operating or
operating backwards.
Check fan motor, fuses and contactors.
Check fan airflow is upward.
Air in refrigerant system.
Check for non-condensables (air) in
system.
Evacuate and recharge system.
Excessive refrigerant charge.
Remove refrigerant.
Measured pressure is incorrect.
Check discharge transducer calibration
and wiring.
SYS X LOW SUCT PRESS
displayed
Suction pressure cut-out incorrectly set. Adjust in accordance with recommended
setting.
Faulty expansion valve.
Replace valve.
Reduced cooler performance.
Check for restricted chilled liquid flow.
Check for fouled tube surfaces.
Low refrigerant charge.
Check for leaks.
Restricted refrigerant flow.
Check for blocked filter/drier.
Check for moisture in the system.
Measure pressure incorrect.
Check suction pressure transducer
calibration/pressure switch and wiring.
SYS X MP/HPCO FAULT
displayed
Compressor internal motor protector
(MP) open.
Verify refrigerant charge is not low.
Verify superheat setting of 10°F - 15°F.
Verify correct compressor rotation.
Verify compressor is not overloaded.
-FHP switch open.
See High Discharge Pressure Fault.
Defective -FHP switch.
Replace -FHP switch.
Compressor(s) do not start
Demand not sufficient.
No problem.
Defective water temperature sensor.
Compare the display with a
thermometer. Should be /- 2°F.
See the BLCT calibration charts.
Contactor failure.
Replace defective part.
Compressor failure.
Diagnose cause of failure and replace.
Lack of cooling effect
Fouled cooler surface. (Low suction
pressure will be observed).
Contact the local Johnson Controls
service representative.
Improper flow through the cooler.
Reduce flow to within unit design
specification.
Low refrigerant charge. (Low suction
pressure will be observed).
Check subcooling and add charge as
needed. Check for leaks.
!! LOW BATTERY !! CHECK PROG /
STP / OPTN
displayed
RTC battery (U5) flat.
Replace U5 and reprogram setpoints,
values, options, time and schedule.
Содержание YLPA 0115SE
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