Carrier 50HQ User Manual download pdf (Page 14)

TROUBLESHOOTING CHART (cont)

PROBLEM

INSUFFICIENT

COOLING OR

HEATING

NOISY OPERATION

CAUSE

Unit undersized

Loss of conditioned air by

leaks

Thermostat

Airflow

Refrigerant charge

Compressor

Reversing valve

Operating pressure

Refrigerant system

Compressor

Contactors

Rattles and vibrations

Airborne noises and

other sounds

Blower and blower motor

CORRECTION

Recalculate heat gains or losses for space to be conditioned. If

excessive, rectify by adding insulation, shading, etc.

Check for leaks in ductwork or introduction of ambient air thru

doors and windows

Improperly located thermostat (e g near kitchen sensing in

accurately the comfort level in living areas).

Lack of adequate airflow or improper distribution of air. _ _

Low on refrigerant charge causing inefficient operation.

Check for defective compressor. If discharge pressure is too low

and suction pressure is too high, compressor is not pumping

properly. Replace compressor.

Defective reversing valve creating bypass of refrigerant from dis

charge to suction side of compressor

Incorrect operating pressure (See chart.)

_______ _

Check strainer and capillary tubes for possible restrictions to flow

of refrigerant

_ _ _ _

The refrigerant system may be contaminated with moisture, non-

condensables, and particles _ ^

____

Dehydrate, evacuate and recharge the system.

Make sure the compressor is not in direct contact with the base or

sides of the cabinet The holddown bolts used for shipping should

be loosened so that the compressor is floating free on its isolator

mounts. Excessive noise will occur if the compressor has a broken

valve or loose discharge tube. Replace the compressor

______________

Blower wheel hitting the casing Adjust for clearance and align

ment Bent blower, check and replace if damaged Loose blower

wheel on shaft Check and tighten Defective bearings, check and

replace

A clattering or humming noise in the contactor could be due to

control voltage less than 18 volts. Check for low supply voltage, low

transformer output or extra long runs of thermostat wires If the

contactor contacts or coil is defective, repair or replace

Check for loose screws, panels or internal components Tighten

and secure. Copper piping could be hitting the metal surfaces

Carefully readjust by bending slightly

Undersized ductwork will cause high airflow velocities and noisy

operation.

_____

______

_____________

_____

________

Excessive water thru the water-cooled heat exchanger will cause a

rattling sound

Throttle back on the water flow ensuring adequate flow for good

operation but eliminating the noise

For replacement items use Carrier Specified Parts.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 1

Tab 5a 5a

Form 50HQ,VQ-2SI Supersedes 50HQ,VQ-1 SI PrintedinUSA 9-81 PC 111 Catalog No 535-029

1 2 ... 9 10 11 12 13 14

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Carrier 50HQ User Manual Page 14

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