Carrier 38AUZ appendix Problem Solution Compressor Cycles on LOW-PRESSURE Switch, System is Noisy

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TROUBLESHOOTING (cont)

 

PROBLEM

 

SOLUTION

COMPRESSOR CYCLES ON LOW-PRESSURE SWITCH

 

 

Indoor-Air Fan Running

 

 

1.

Liquid line solenoid valve(s) fails to open.

1.

Check liquid line solenoid valve(s) for proper operation. Replace if

 

 

 

necessary.

2.

Filter drier plugged.

2.

Replace filter drier.

3.

Expansion valve power head defective.

3.

Replace power head.

4.

Low refrigerant charge.

4.

Add charge. Check low-pressure switch setting.

Airflow Restricted

 

 

1.

Coil iced up.

1.

Check refrigerant charge.

2.

Coil dirty.

2.

Clean coil fins.

3.

Air filters dirty.

3.

Clean or replace filters.

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 filters dirty.

3.

Clean or replace filters.

4.

Expansion valve power head defective.

4.

Replace power head.

5.

Indoor coil partially iced.

5.

Check low-pressure setting.

6.

Indoor airflow restricted.

6.

Remove obstruction.

Suction Pressure High

 

 

1. Unloaders not functioning

1. Check unloader adjustments. Check unloader setting.

2.

Heat load excessive.

2.

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 filter drier.

4.

Clean or replace.

 

 

 

SYSTEM IS NOISY

 

 

1.

Piping vibration.

1.

Support piping as required.

2.

Compressor noisy.

2.

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 filter drier.

1.

Remove restriction or replace.

2.

Liquid line solenoid valve partially closed.

2.

Replace valve.

 

 

 

 

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Contents Contents Safety ConsiderationsInstallation Guideline Replacement /Retrofit R22 to Puron38AUZ*07-14 Unit Dimensions Unit Size 38AU Refrigerant TypeCompressor Condenser FansOperating Weight kg Aluminum-Fin Coils Standard Pressurestat Settings kPa High CutoutNominal Capacity kW Operating Charge, Typical kg† Shipping Charge kgService Options Model TypeType of Coil Refrigerant OptionsInstallation Liquid Line Data 38AUZ*07-14 60 Hz Units Refrigerant Piping Sizes 38AUZ*07-14 60 Hz UnitsInstall Accessories Field Power SupplyComplete Electrical Connections Refrigerant Specialities Part NumbersUnits Without Factory-Installed Disconnect Units with Factory-Installed DisconnectConvenience Outlets All unitsInstalling Weatherproof Cover Unit Connect Primary TransformerConnections Terminals Weatherproof Cover Installation ThermostatElectrical Data 38AUZ*07-14 Hz Units PRE-START-UP START-UPSystem Check Advanced Scroll Temperature Protection Label 38AUZ*07 Charging Chart 38AUZ*14 Charging Chart Routine System Maintenance Operating SequenceBase Unit Controls Service Comfort Alert Diagnostic ModuleInput LED Status Codes LockoutCadm Troubleshooting Compressor ProtectionLubrication Novation Coil Cleaning and Maintenance Repairing Novation Condenser Tube LeaksField Refrigerant Access Ports Factory High-Flow Access PortsTroubleshooting Problem Solution Compressor does not RUNCompressor Stops on HIGH-PRESSURE Switch Fastener Torque ValuesProblem Solution Compressor Cycles on LOW-PRESSURE Switch Compressor Running but Cooling InsufficientUnit Operates TOO Long or Continuously System is NoisyAppendix Catalog No 38AU-01SI Preliminary Information CUT Along Dotted Linecut Along Dotted Line

38AUZ specifications

The Carrier 38AUZ series is a line of air conditioning systems specifically designed to deliver optimal comfort and energy efficiency for both residential and commercial applications. Known for their advanced technology and robust performance, these units are ideal for a variety of climate conditions, ensuring consistent cooling and heating throughout the year.

One of the standout features of the Carrier 38AUZ series is its inverter technology, which allows the unit to adjust its cooling or heating output in real-time based on the ambient conditions. This results in lower energy consumption and reduced operating costs, making the system not only environmentally friendly but also budget-conscious. By minimizing temperature fluctuations, the inverter design promotes a more stable and comfortable indoor environment.

The 38AUZ units are equipped with high-efficiency compressors that enhance the system’s performance. These compressors operate quietly and efficiently, contributing to a lower noise level that is ideal for residential settings. Furthermore, they come with variable speed fan motors which offer precise airflow control, allowing users to customize their comfort level while ensuring energy savings.

In terms of build quality, the Carrier 38AUZ is constructed using durable materials designed to withstand harsh weather conditions. Its compact design allows for easy installation and maintenance, making it an ideal choice for urban environments where space is limited. Additionally, the system features a corrosion-resistant cabinet that extends its lifespan and maintains aesthetic appeal.

The 38AUZ series also includes a range of advanced control options. Users can benefit from smart technology integration, allowing for remote temperature control and scheduling through mobile devices. This feature not only enhances convenience but also provides users with complete control over their energy usage.

Moreover, the Carrier 38AUZ units come with various capacity options, catering to different space requirements. With a focus on energy efficiency, these systems often meet or exceed industry standards, including SEER ratings, ensuring optimal performance without sacrificing energy consumption.

In summary, the Carrier 38AUZ series is an exemplary choice for anyone looking to invest in a reliable, efficient, and advanced air conditioning system. With its inverter technology, high-efficiency compressors, smart control options, and durable construction, the 38AUZ not only delivers exceptional comfort but also promotes energy conservation, making it a smart choice for sustainable living.
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