TROUBLESHOOTING (cont)

 

PROBLEM

 

SOLUTION

 

 

 

COMPRESSOR CYCLES ON LOW-PRESSURE SWITCH (cont)

 

 

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.

 

 

 

COMPRESSOR RUNNING BUT COOLING INSUFFICIENT

 

 

Suction Pressure Low

 

 

1.

Refrigerant charge low.

1.

Add refrigerant.

2.

Head pressure low.

2.

Check refrigerant charge.

 

 

 

Check outdoor-air fan thermostat settings.

3.

Air ®lters dirty.

3.

Clean or replace ®lters.

4.

Expansion valve power head defective.

4.

Replace power head.

5.

Indoor coil partially iced.

5.

Check low-pressure setting.

6.

Indoor air¯ow restricted.

6.

Remove obstruction.

Suction Pressure High

 

 

1.

Unloaders not functioning.

1.

Check unloader adjustments.

 

 

 

Check unloader setting.

2.

Compressor valve defective.

2.

See compressor service literature.

3.

Heat load excessive.

3.

Check for open doors or windows in vicinity of fan coil.

 

 

 

UNIT OPERATES TOO LONG OR CONTINUOUSLY

 

 

1.

Low refrigerant charge.

1.

Add refrigerant.

2.

Control contacts fused.

2.

Replace control.

3.

Air in system.

3.

Purge and evacuate system.

4.

Partially plugged expansion valve or ®lter drier.

4.

Clean or replace.

 

 

 

SYSTEM IS NOISY

 

 

1.

Piping vibration.

1.

Support piping as required.

2.

Compressor noisy.

2.

Check valve plates for valve noise. Replace compressor if

 

 

 

bearings are worn.

COMPRESSOR LOSES OIL

 

 

1.

Leak in system.

1.

Repair leak.

2.

Crankcase heaters not energized during shutdown.

2.

Check wiring and relays. Check heater and replace if

 

 

 

defective.

3.

Improper interconnecting piping design.

3.

Check piping for oil return. Replace if necessary.

 

 

 

FROSTED SUCTION LINE

 

 

Expansion valve admitting excess refrigerant.

Adjust expansion valve.

 

 

 

HOT LIQUID LINE

 

 

1.

Shortage of refrigerant due to leak.

1.

Repair leak and recharge.

2.

Expansion valve opens too wide.

2.

Adjust expansion valve.

 

 

 

FROSTED LIQUID LINE

 

 

1.

Restricted ®lter drier.

1.

Remove restriction or replace.

2.

Liquid line solenoid valve partially closed.

2.

Replace valve.

 

 

 

COMPRESSOR WILL NOT UNLOAD

 

 

1.

Defective unloader.

1.

Replace unloader.

2.

Defective capacity control solenoid valve (if used).

2.

Replace valve.

3.

Miswired capacity control liquid line solenoid (if used).

3.

Rewire correctly.

4.

Weak, broken, or wrong valve body spring.

4.

Replace spring.

 

 

 

COMPRESSOR WILL NOT LOAD

 

 

1.

Miswired capacity control liquid line solenoid (if used).

1.

Rewire correctly.

2.

Defective capacity control solenoid valve (if used).

2.

Replace valve.

3.

Plugged strainer (high side).

3.

Clean or replace strainer.

4.

Stuck or damaged unloader piston or piston ring(s).

4.

Clean or replace the necessary parts.

 

 

 

 

16

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Carrier 38AE016, 38AE012, 38AE014 specifications Troubleshooting, Compressor Running but Cooling Insufficient
Page 15 Page 17

38AE014, 38AE016, 38AE012 specifications

The Carrier 38AE012, 38AE016, and 38AE014 are part of the Carrier series of packaged rooftop air conditioning units, designed to deliver reliable and efficient cooling solutions for commercial and industrial applications. These units showcase advanced engineering and technology, addressing the diverse needs of modern HVAC systems.

One of the primary features of the Carrier 38AE series is their high-efficiency performance. They utilize advanced scroll compressor technology, which results in lower energy consumption while providing consistent cooling. With high SEER (Seasonal Energy Efficiency Ratio) ratings, these units help businesses reduce operational costs while maintaining comfortable indoor environments.

The construction of the Carrier 38AE units emphasizes durability and resilience. Built with high-quality materials, they are engineered to withstand harsh weather conditions and the rigors of daily use. The weatherized cabinets protect internal components from precipitation and corrosion, ensuring long-term reliability.

The 38AE series incorporates a sophisticated electronic control system that enhances performance monitoring and diagnostics. This feature allows facility managers to easily manage and optimize the unit's operations, improving efficiency and reducing potential downtime. Integrated with smart controls, these systems can be programmed for specific operating schedules, allowing for further energy savings.

Another standout technology in the Carrier 38AE series is the environmentally friendly refrigerant. By utilizing R-410A, these units contribute to reduced ozone depletion while still providing powerful cooling capabilities. This aligns with contemporary regulatory standards and climate initiatives to promote sustainable usage of HVAC systems.

The Carrier 38AE012, 38AE016, and 38AE014 models also excel in noise reduction technology, which is essential for commercial settings where ambient noise levels need to be minimized. The design includes low-noise fans and strategically placed insulation, resulting in quieter operation that enhances comfort for occupants.

In terms of installation, these units are versatile and can be easily mounted on building rooftops or on the ground. They feature a compact design, which facilitates seamless integration into existing structures without requiring extensive modifications.

Overall, the Carrier 38AE012, 38AE016, and 38AE014 models stand out for their combination of efficiency, durability, and advanced technology. They cater to a wide range of commercial needs, providing essential cooling while prioritizing sustainability and user comfort. With a commitment to innovation, Carrier continues to be a leader in the HVAC industry, ensuring that their products meet the evolving demands of energy efficiency and reliability.
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