TROUBLESHOOTING

 

PROBLEM

 

SOLUTION

COMPRESSOR DOES NOT RUN

 

 

Contactor Open

 

 

1.

Power off.

1.

Restore power.

2. Fuses blown in ®eld power circuit.

2.

After ®nding cause and correcting, replace with correct

3. No control power.

 

size fuse.

3.

Check secondary fuse(s); replace with correct type and

 

 

 

size. Replace transformer if primary windings receiving

4.

Thermostat circuit open.

 

power.

4.

Check thermostat setting.

5.

Multi-function timer not operating.

5.

Check timer for proper operation; replace if defective.

6.

Compressor circuit breaker tripped.

6.

Check for excessive compressor current draw. Reset

7.

Safety device lockout circuit active.

 

breaker; replace if defective.

7.

Reset lockout circuit at thermostat or circuit breaker.

8. Low-pressure switch open.

8.

Check for refrigerant undercharge, obstruction of indoor

 

 

 

air¯ow, or whether compressor suction shutoff valve is

 

 

 

fully open. Make sure liquid line solenoid valve(s) is

9. High-pressure switch open.

 

open.

9.

Check for refrigerant overcharge, obstruction of outdoor

 

 

 

air¯ow, air in system or whether compressor discharge

 

 

 

valve is fully open. Be sure outdoor fans are operating

10. Discharge gas temperature switch open.

 

correctly.

10.

Check for open condition. Allow for reset. Replace if

11.

Loose electrical connections.

 

defective.

11.

Tighten all connections.

12. Compressor stuck.

12.

See 06E compressor service literature.

Contactor Closed

 

 

1.

Compressor leads loose.

1.

Check connections.

2.

Motor windings open.

2.

See 06E compressor service literature.

3.

Single phasing.

3.

Check for blown fuse. Check for loose connection at

 

 

 

compressor terminal.

COMPRESSOR STOPS ON HIGH-PRESSURE SWITCH

 

 

Outdoor Fan On

 

 

1.

High-pressure switch faulty.

1.

Replace switch.

2.

Air¯ow restricted.

2.

Remove obstruction.

3.

Air recirculating.

3.

Clear air¯ow area.

4.

Noncondensables in system.

4.

Purge and recharge as required.

5.

Refrigerant overcharge.

5.

Purge as required.

6.

Line voltage incorrect.

6.

Consult power company.

7.

Refrigerant system restrictions.

7.

Check or replace ®lter drier, expansion valve, etc. Check

 

 

 

that compressor discharge valve is fully open.

Outdoor Fan Off

 

 

1.

Fan slips on shaft.

1.

Tighten fan hub setscrews.

2.

Motor not running.

2.

Check power and capacitor.

3.

Motor bearings stuck.

3.

Replace bearings.

4.

Motor overload open.

4.

Check overload rating. Check for fan blade obstruction.

5.

Motor burned out.

5.

Replace motor.

COMPRESSOR CYCLES ON LOW-PRESSURE SWITCH

 

 

Indoor-Air Fan Running

 

 

1.

Filter drier plugged.

1.

Replace ®lter drier.

2.

Expansion valve power head defective.

2.

Replace power head.

3.

Low refrigerant charge.

3.

Add charge. Check low-pressure switch setting.

Air¯ow Restricted

 

 

1.

Coil iced up.

1.

Check refrigerant charge.

2.

Coil dirty.

2.

Clean coil ®ns.

3.

Air ®lters dirty.

3.

Clean or replace ®lters.

4.

Dampers closed.

4.

Check damper operation and position.

Indoor-Air Fan Stopped

 

 

1.

Electrical connections loose.

1.

Tighten all connections.

2.

Fan relay defective.

2.

Replace relay.

3.

Motor overload open.

3.

Power supply.

4.

Motor defective.

4.

Replace motor.

5.

Fan belt broken or slipping.

5.

Replace or tighten belt.

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Image 53
Carrier 38AH044-084 specifications Problem Solution Compressor does not RUN, Compressor Stops on HIGH-PRESSURE Switch
Page 52 Page 54

38AH044-084 specifications

The Carrier 38AH044-084 is an innovative air conditioning unit designed to provide efficient cooling solutions for residential and light commercial applications. This model is a part of Carrier's Aqua Series and is well-regarded for its combination of performance, energy efficiency, and innovative features.

One of the standout characteristics of the Carrier 38AH044-084 is its high-efficiency rating, which often exceeds the minimum efficiency standards set by the Department of Energy. Its Seasonal Energy Efficiency Ratio (SEER) rating is commendable, indicating significant energy savings over traditional air conditioning units. This efficiency translates to lower utility bills and a reduced carbon footprint, making it an environmentally friendly option.

In terms of technology, the Carrier 38AH044-084 is equipped with a modern scroll compressor. This type of compressor is known for its durability and quiet operation, contributing to a more pleasant indoor environment. The unit also incorporates advanced refrigerant technology, often using R-410A refrigerant, which is recognized for its lower environmental impact compared to older refrigerants like R-22.

The design of the 38AH044-084 focuses on ease of installation and maintenance. The compact footprint makes it suitable for various installation scenarios, whether on rooftops or ground levels. Additionally, the unit is engineered for durability, featuring weather-resistant components that can withstand harsh environmental conditions.

Another notable feature is the advanced airflow system, which ensures even distribution of cooled air throughout the space. This technology minimizes hot spots and enhances overall comfort. Furthermore, the unit supports a range of thermostatic controls, allowing users to customize their cooling experience according to their specific needs.

The Carrier 38AH044-084 is also designed with noise reduction in mind. Its sound-dampening technology helps minimize operational noise, making it a suitable choice for residential areas where noise levels are a concern.

In summary, the Carrier 38AH044-084 offers an excellent combination of energy efficiency, advanced technology, and user-friendly features. Whether for a home or a light commercial space, this unit provides reliable cooling performance while maintaining a focus on environmental responsibility and occupant comfort. With its robust design and innovative capabilities, it's a solid choice for those seeking effective and efficient air conditioning solutions.
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