Carrier Official Manual for Installation and Troubleshooting of Air Conditioners

Page 20

Table 6 — LED Status Codes

Status LED

Status LED Description

Status LED Troubleshooting Information

Green “POWER”

Module has power

Supply voltage is present at module terminals

Red “TRIP”

Thermostat demand signal Y

1.

Compressor protector is open

LED On Solid

is present, but the

2.

Condensing unit power disconnect is open

 

compressor is not running.

 

3.

Compressor circuit breaker or fuse(s) is open

 

 

 

 

4.

Broken supply wires or connector is not

 

 

 

making contact

 

 

5.

Compressor power wires not routed through

 

 

 

Comfort Alert

 

 

6.

Compressor contactor has failed open

Red “TRIP” LED

The anti-short cycle timer (3

minutes), in module is preventing compressor

Flashing

restart.

 

 

 

Module locks out

compressor when compressor damaging ALERT code appears.

Lockout ALERT codes are noted in the Status LED Description.

During a compressor lock out, 24VAC power must be removed from module to manually reset.

Yellow “ALERT”

A short circuit or over current

1.

Compressor contactor coil shorted

LED On Solid

condition exists on PROT

2.

Electrical load too high for PROT circuit

 

terminal.

 

 

(maximum 1 Amp)

 

 

 

 

 

3.

24 V AC wired directly to PROT terminal

Yellow “ALERT”

System Pressure Trip

1.

High head pressure

Flash Code 2

Discharge pressure out of

2.

Condenser coil poor air circulation (dirty,

 

limits or compressor

 

 

blocked, damaged)

 

overload (if no high pressure

 

 

3.

Condenser fan is not running

 

switch in system)

 

LOCKOUT

4.

If low pressure switch is open:

 

 

 

Refer to Code 3 for troubleshooting

Yellow “ALERT”

Short Cycling

1.

If low pressure switch is open:

Flash Code 3

Compressor is running only

 

a.

Low refrigerant charge

 

briefly LOCKOUT

 

 

 

b. Evaporator blower is not running

 

 

 

 

 

 

c. Evaporator coil is frozen

 

 

 

d.

Faulty metering device

 

 

 

e.

Condenser coil is dirty

 

 

 

f.

Liquid line restriction (filter drier blocked if

 

 

 

 

present)

 

 

2.

If high pressure switch is open, go to Flash

 

 

 

Code 2 information

 

 

3.

Intermittent thermostat demand signal

 

 

4.

System or control board defective

Yellow “ALERT”

Locked Rotor

1.

Low line voltage to compressor

Flash Code 4

LOCKOUT

2.

Excessive liquid refrigerant in compressor

 

 

 

 

3.

Compressor bearings are seized

Yellow “ALERT”

Open Circuit

1.

Condensing unit power disconnect is open

Flash Code 5

 

2.

Compressor circuit breaker or fuses are open

 

 

 

 

3.

Compressor contactor has failed open

 

 

4.

High pressure switch is open and requires

 

 

 

manual reset

 

 

5.

Broken supply wires or connector is not

 

 

 

making contact

 

 

6.

Unusually long compressor protector reset

 

 

 

time due to extreme ambient temperature

 

 

7.

Compressor windings are damaged

Yellow “ALERT”

Missing Phase

1.

Compressor fuse is open on one phase

Flash Code 6

LOCKOUT

2.

Broken wire or connector on one phase

 

 

 

 

3.

Compressor motor winding is damaged

 

 

4.

Utility supply has dropped one phase

Yellow “ALERT”

Reverse Phase

1.

Compressor running backward due to supply

Flash Code 7

LOCKOUT

 

phase reversal

Yellow “ALERT”

Welded Contactor

1.

Compressor contactor has failed closed

Flash Code 8

Compressor always runs

2.

Thermostat demand signal not connected to

 

 

 

module

Yellow “ALERT”

Low Voltage

1.

Control circuit transformer is overloaded

Flash Code 9

Control circuit < 18VAC

2.

Low line voltage to compressor

 

 

20

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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 unitsConnections Terminals Installing Weatherproof CoverUnit Connect Primary Transformer Weatherproof Cover Installation ThermostatElectrical Data 38AUZ*07-14 Hz Units System Check PRE-START-UPSTART-UP Advanced Scroll Temperature Protection Label 38AUZ*07 Charging Chart 38AUZ*14 Charging Chart Base Unit Controls Routine System MaintenanceOperating Sequence Input ServiceComfort Alert Diagnostic Module LED Status Codes LockoutLubrication Cadm TroubleshootingCompressor Protection 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.