Carrier 38AUZ appendix Compressor Protection, Lubrication, Cadm Troubleshooting

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Table 7 — CADM Troubleshooting

Miswired Module Indication

Recommended Troubleshooting Action

Green LED is not on,

Determine if both R and C module terminals are

module does not power up

connected. Verify voltage in present at module’s R and C

 

terminals.

 

NOTE: The CADM requires a constant nominal 24VAC

 

power supply. The wiring to the module’s R and C

 

terminals must be directly from the control transformer.

 

The module cannot receive its power from another device

 

that will interrupt the 24VAC power supply. See Fig. 20,

 

the 38AU Wiring Diagram.

 

 

Green LED Intermittent,

Determine if R and Y terminals are wired in reverse. Verify

module powers up only

module’s R and C terminals have a constant source. See

when compressor runs

“NOTE” above for details on R and C wiring.

 

 

TRIP LED is on but system

Verify Y terminal is wired properly per the 38AU wiring

and compressor check OK

diagram (see Fig. 19). Verify voltage at contactor coil falls

 

below 0.5VAC when off. Verify 24VAQC is present across

 

Y and C when thermostat demand signal is present. If not,

 

R and C are reverse wired.

 

 

TRIP LED and ALERT LED

Verify R and C terminals are supplied with 19-28VAC.

flashing together

 

 

 

ALERT Flash Code 3

Verify Y terminal is connected to 24VAC at contactor coil.

(Compressor Short Cycling)

Verify voltage at contactor coil falls below 0.5VAC when

displayed incorrectly

off.

 

 

ALERT Flash Code 5 or 6

Check that compressor T1 and T3 wires are through

(Open Circuit, Missing Phase)

module’s current sensing holes. Verify Y terminal is

displayed incorrectly

connected to 24VAC at contactor coil. Verify voltage at

 

contactor coil falls below 0.5VAC when off.

 

 

Alert Flash Code *

Determine if module’s Y terminal is connected. Verify Y

(Welded Contactor)

terminal is connected to 24VAC at contactor coil. Verify

displayed incorrectly

24VAC is present across Y and C when thermostat

 

demand signal is present. If not, R and C are reverse

 

wired. Verify voltage at contactor coil falls below 0.5VAC

 

when off.

 

 

Crankcase Heater — The heater prevents refrigerant migration and compressor oil dilution during shutdown when- ever compressor is not operating. The heater is wired to cycle with the compressor; the heater is off when compressor is run- ning, and on when compressor is off.

The crankcase heater will operate as long as the power circuit is energized.

Compressor Protection

COMPRESSOR OVERTEMPERATURE PROTECTION (IP) — A thermostat installed on the compressor motor wind- ing reacts to excessively high winding temperatures and shuts off the compressor.

CRANKCASE HEATER — The heater minimizes absorp- tion of liquid refrigerant by oil in the crankcase during brief or extended shutdown periods. The main disconnect must be on to energize the crankcase heater.

IMPORTANT: Never open any switch or disconnect that energizes the crankcase heater unless unit is being serviced or is to be shut down for a prolonged period. After a pro- longed shutdown on a service job, energize the crankcase heater for 24 hours before starting the compressor.

ADVANCED SCROLL TEMPERATURE PROTECTION (ASTP) — See “Advanced Scroll Temperature Protection (ASTP)” on page 15.

Low-Pressure Switch — The 38AUZ low-pressure switch is stem-mounted on the suction line. Switches are all fixed, non-adjustable type.

High-Pressure Switch — The 38AUZ high-pres- sure switch is stem-mounted on the discharge line. The switch is a fixed, non-adjustable type.

Outdoor Fans — Each fan is supported by a formed-wire mount bolted to the fan deck and covered with a wire guard. Fan motors have permanently lubricated bearings.

Lubrication

FAN MOTORS have sealed bearings. No provisions are made for lubrication.

COMPRESSOR has its own oil supply. Loss of oil due to a leak in the system should be the only reason for adding oil after the system has been in operation.

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Contents Safety Considerations ContentsReplacement /Retrofit R22 to Puron Installation Guideline38AUZ*07-14 Unit Dimensions Refrigerant Type Unit Size 38AUCompressor Condenser FansPressurestat Settings kPa High Cutout Operating Weight kg Aluminum-Fin Coils StandardNominal Capacity kW Operating Charge, Typical kg† Shipping Charge kgModel Type Service OptionsType of Coil Refrigerant OptionsInstallation Refrigerant Piping Sizes 38AUZ*07-14 60 Hz Units Liquid Line Data 38AUZ*07-14 60 Hz UnitsField Power Supply Install AccessoriesComplete Electrical Connections Refrigerant Specialities Part NumbersUnits with Factory-Installed Disconnect Units Without Factory-Installed DisconnectConvenience Outlets All unitsInstalling Weatherproof Cover Unit Connect Primary TransformerConnections Terminals Thermostat Weatherproof Cover InstallationElectrical 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 Lockout LED Status CodesCadm Troubleshooting Compressor ProtectionLubrication Repairing Novation Condenser Tube Leaks Novation Coil Cleaning and MaintenanceField Refrigerant Access Ports Factory High-Flow Access PortsProblem Solution Compressor does not RUN TroubleshootingCompressor Stops on HIGH-PRESSURE Switch Fastener Torque ValuesCompressor Running but Cooling Insufficient Problem Solution Compressor Cycles on LOW-PRESSURE SwitchUnit Operates TOO Long or Continuously System is NoisyAppendix Catalog No 38AU-01SI Preliminary Information CUT Along Dotted Linecut Along Dotted Line

38AUZ specifications

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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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