Carrier 060 Bedienerhandbuch PDF herunterladen (Seite 24)

Table 5—Cooling and Heating Troubleshooting Chart

SYMPTOM CAUSE REMEDY

Compressor and outdoor fan will not start

Power failure Call power company

Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker

Defective thermostat, contactor, transformer, con-

trol relay or defrost board

Replace component

Insufficient line voltage Determine cause and correct

Incorrect or faulty wiring Check wiring diagram and rewire correctly

Thermostat setting too high

Lower thermostat setting below room tempera-

ture

Units have a 5-min. time delay

DO NOT bypass this compressor time

delay—wait for 5 min. until time-delay relay is

deenergized

Compressor will not start but condenser fan

runs

Faulty wiring or loose connections in compressor

circuit

Check wiring and repair or replace

Compressor motor burned out, seized, or internal

overload open

Determine cause

Replace compressor

Defective run capacitor, overload, or PTC (posi-

tive temperature coefficient) thermistor

Determine cause and replace

One leg of 3-phase power dead

Replace fuse or reset circuit breaker

Determine cause

Low input voltage (20% low) Determine cause and correct

Three-phase scroll compressor (size 030-

060units) makes excessive noise, and there

may be a low pressure differential

Scroll compressor is rotating in the wrong direc-

tion

Correct the direction of rotation by reversing the

3-phase power leads to the unit

Compressor cycles (other than normally sat-

isfying thermostat)

Refrigerant overcharge or undercharge

Recover refrigerant, evacuate system, and re-

charge to capacities shown on nameplate

Defective compressor Replace and determine cause

Insufficient line voltage Determine cause and correct

Blocked outdoor coil Determine cause and correct

Defective run/start capacitor, overload or start

relay

Determine cause and replace

Defective thermostat Replace thermostat

Faulty outdoor-fan motor or capacitor Replace

Damaged reversing valve Determine cause and correct

Restriction in refrigerant system Locate restriction and remove

Compressor operates continuously

Dirty air filter Replace filter

Unit undersized for load Decrease load or increase unit size

Thermostat set too low Reset thermostat

Low refrigerant charge Locate leak, repair, and recharge

Leaking valves in compressor Replace compressor

Frosted coil with incorrect defrost operation

Check defrost time settings

Reset as necessary

Check defrost temperature switch

Replace as necessary

Air in system

Recover refrigerant, evacuate system, and re-

charge

Outdoor coil dirty or restricted Clean coil or remove restriction

Excessive head pressure

Dirty air filter Replace filter

Dirty indoor or outdoor coil Clean coil

Refrigerant overcharged Recover excess refrigerant

Air in system

Recover refrigerant, evacuate system, and re-

charge

(Heat) Indoor air restricted or recirculating Determine cause and correct

Indoor or outdoor air restricted or air short-cycling Determine cause and correct

Head pressure too low

Low refrigerant charge Check for leaks, repair and recharge

Compressor valves leaking Replace compressor

Restriction in liquid tube Remove restriction

Excessive suction pressure

(Heat) Outdoor coil frosted

Move timer on control board to 30 min. between

defrost cycles

(Cool) High Heat load Check for source and eliminate

Compressor valves leaking Replace compressor

Reversing valve hung up or leaking internally Replace valve

Refrigerant overcharged Recover excess refrigerant

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