Carrier 30AJ Manual De Instalación, Operación Y Mantenimiento página 49

PROBLEMA
5. Unit runs continuously, but with
low performance.
6. High discharge pressure
7. Reduced discharge pressure.
POSSíVEL CAUSA
Excessive thermal load.
Refrigerant lack.
Dirt in the condensers.
Defective compressor.
Insufficient refrigerant supply in the
evaporator.
Faulty thermal insulation.
Air in the system cold water.
Oil in evaporator.
Compressor runs in reverse rotation.
Low air flow in condenser.
Dirty condenser.
High condensation entering air
temperatures.
Excess of refrigerant.
Excessive air flow in the condenser.
Refrigerant lack.
Defective compressor.
Compressor runs in reverse rotation.
PROCEDIMENTO
* Check project conditions.
* Check and fix leaks. Add refrigerant if
required.
* Check and clean.
* Check compressor pressures and
currents. Replace if required.
* Check if there are obstructions in the
dryer filter, or in the lines. Replace or
correct.
* Check expansion valve obstruction.
Replace if necessary.
* Check the position of the expansion
valve bulb or equalizer tube. Correct
according to manufacturer specifications.
* Fix or replace.
* To take air of the system.
* Check and drain.
* Check suction and discharge pressures.
In case reversion is detected, invert the
terminal power cables.
Check fan rotation.
* Check fan rotation. Fix if necessary.
* Check motor operation. Replace if
necessary.
* Check dirt in the coil. Clean and provide
proper filtering.
* Check and clean.
* Check condensation air short circuit or
insufficient air intake. To Correct.
* Check components of the chilled water
installation. To Correct.
* Check and remove excess, setting sub-
cooling between 8 and 11 °C.
* Check and adjust.
* Check and fix leaks. Add refrigerant if
required.
* Check suction and discharge pressures.
Replace if necessary.
* Check suction and discharge pressures.
In case reversion is detected, invert the
terminal power cables.
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