Carrier 38AU appendix LED Status Codes, Lockout

Carrier 38AU Start Unit, Compressor Overload, Advanced Scroll Temperature Protection Astp, Adjust Refrigerant Charge Carrier appendix 38AUZ*25 Check Compressor Oil Level, Final Checks Carrier appendix 38AUD*16 Charging Chart Novation Carrier appendix 38AUZ*16 Charging Chart Rtpf Carrier appendix 38AUD*16 Charging Chart Rtpf Carrier appendix 38AUD*25 Charging Chart Rtpf Carrier appendix Typical 38AUZ Wiring Diagram 15 Ton 230V Tandem Unit Shown Carrier appendix Typical 38AUD Wiring Diagram 15 Ton 230V Dual Unit Shown Carrier 38AU appendix Operating Sequence, Base Unit Controls Carrier 38AU appendix Routine System Maintenance, Service, Refrigeration System, Equipment Damage Hazard Carrier 38AU appendix Liquid Line Filter Drier, Field Refrigerant Access Ports, Factory High-Flow Access Ports Carrier 38AU appendix Comfort Alert Diagnostic Module, Input Terminal Voltage Carrier 38AU appendix LED Status Codes, Lockout Carrier 38AU appendix Compressor Protection Carrier appendix 38AUD Size 16 Cabinet Carrier 38AU appendix Lps Carrier appendix 38AUZ,D Size 25 Cabinet Carrier appendix 38AUZ*25 Compressor Assembly Rear View Carrier 38AU appendix Coil Type Identification, NOVATIONt Type, Round-Tube Plate-Fin Rtpf Type Carrier 38AU appendix Replacing NOVATIONt Condenser Coil, Routine Cleaning of Round-Tube Plate Fin Rtpf Coils Carrier 38AU appendix Fastener Torque Values, Troubleshooting, Problem Solution Compressor does not RUN Carrier 38AU Problem Solution Compressor Cycles on LOW-PRESSURE Switch, Compressor Running but Cooling Insufficient Carrier 38AU appendix Appendix a, Appendix B, Wiring Diagram List Carrier 38AU Appendix C, Low Ambient Option Factory Installed, Operation, Troubleshooting, Speed Control Sensor Resistance Carrier appendix Motormaster Sensor Location, 38AUZ*16 & 38AUD*16 Novation 38AUZ*16/25 & 38AUD*16/25 Rtpf Carrier 38AU appendix Wind Baffle Dimension, Dimensions --- Inches Unit Baffle, Dimensions --- MM Unit Baffle Carrier 38AU appendix Wind Baffles Fabrication Carrier 38AU appendix Ton Wind Baffle Brackets Fabrication Carrier 38AU appendix Front Carrier 38AU appendix Front Back Left Right Carrier appendix Catalog No 38AU---09SI Carrier 38AU appendix START-UP Checklist, II. PRE-START-UP Outdoor Unit Carrier 38AU appendix Check Voltage Imbalance
Page 36

38AU

Table 11 – 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

1.

Compressor protector is open

LED On Solid

Y is present, but the com-

2.

Condensing unit power disconnect is open

 

pressor 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 restart.

Flashing

 

 

 

 

 

 

 

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 cur-

1.

Compressor contactor coil shorted

LED On Solid

rent condition exists on

2.

Electrical load too high for PROT circuit (maximum 1 Amp)

 

PROT terminal.

 

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, blocked, damaged)

 

limits or compressor over-

 

 

 

 

 

load (if no high pressure

3.

Condenser fan is not running

 

switch in system)

4.

If low pressure switch is open: Refer to Code 3 for troubleshooting

 

LOCKOUT

 

 

 

 

Yellow “ALERT”

Short Cycling

1.

If low pressure switch is open:

Flash Code 3

Compressor is running only

 

a.

Low refrigerant charge

 

briefly (four consecutive

 

 

 

 

 

 

cycles of less than three

 

b.

Evaporator blower is not running

 

minutes each)

 

c.

Evaporator coil is frozen

 

LOCKOUT

 

 

 

 

 

 

 

 

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 phase reversal

Flash Code 7

LOCKOUT

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

36

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Contents Installation, Start---Up Service Instructions ContentsSafety Considerations Installation GuidelineReplacement/Retrofit R-22 to PuronR Installation Unit Damage HazardUnit MchxRtpf 38AUZ*25 38AUD*25Unit Size 38AU Refrigerant TYPE‡Compressor Condenser FansPressurestat Settings kPa High Cutout Nominal Capacity kWRtpf Shipping Charge kg ScrollRtpf Shipping Charge A/B lb Oil Charge A/B ozFace Area sq ft total Rows/Fins per inch FPI Operating Weight kg Novation Coil Al Tube Rtpf Shipping Charge A/B kgOil Charge A/B L Qty...r/s Motor Hp Nema Diameter mmU Z a 2 5 a 0 G 6 a 0 a 0 a Installation Matching 38AU Model To Evaporator CoilJobsite Survey Do not Bury Refrigeration LinesProvide Safety Relief Slab MountEquivalent Lengths for Common Fittings ft Check 38AU Model with Evaporator Coil ConnectionsLiquid Lift Suction Riser38AUZ 16-25 Piping Recommendations Single-Circuit Unit 38AUD 16-25 Piping Recommendations Two-Circuit Unit Vertical Separation outdoor unit above indoor unitInsulate Suction Lines Hot Gas BypassInstall Filter Driers and Moisture Indicators Refrigerant Specialties Part NumbersInstall Liquid Line Solenoid Valve Capacity Control Liquid Line Solenoid ValveSelecting an Accumulator Make Piping ConnectionsEvacuation/Dehydration Preliminary ChargeField Power Supply Units with Factory-Installed DisconnectFire Hazard All UnitsConvenience Outlets Electrical Operation HazardField Control Wiring Convenience Outlet Utilization Notice LabelControl Transformer Wiring ThermostatUnit Wire/Fuse or Hacr Breaker Sizing Data Unbalanced 3-Phase Supply VoltagePRE-START-UP START-UPSystem Check Preliminary ChecksAdvanced Scroll Temperature Protection Astp Adjust Refrigerant ChargeUsing plotted operating point Start Unit38AUZ*25 Check Compressor Oil Level Final Checks38AUD*16 Charging Chart Novation 38AUZ*16 Charging Chart Rtpf 38AUD*16 Charging Chart Rtpf 38AUD*25 Charging Chart Rtpf Typical 38AUZ Wiring Diagram 15 Ton 230V Tandem Unit Shown Typical 38AUD Wiring Diagram 15 Ton 230V Dual Unit Shown Operating Sequence Base Unit ControlsRoutine System Maintenance ServiceRefrigeration System Equipment Damage HazardField Refrigerant Access Ports Factory High-Flow Access PortsLiquid Line Filter Drier Comfort Alert Diagnostic Module Input Terminal VoltageLED Status Codes LockoutCompressor Protection 38AUD Size 16 Cabinet LPS 38AUZ,D Size 25 Cabinet 38AUZ*25 Compressor Assembly Rear View Novation Coil Cleaning and Maintenance Repairing Novation Condenser Tube LeaksCoil Type Identification NOVATIONt TypeRoutine Cleaning of Round-Tube Plate Fin Rtpf Coils Replacing NOVATIONt Condenser CoilUnit Reliability Hazard Troubleshooting 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 NoisyWiring Diagram List Appendix aAppendix B Low Ambient Option Factory Installed TroubleshootingAppendix C OperationMotormaster Sensor Location 38AUZ*16 & 38AUD*16 Novation 38AUZ*16/25 & 38AUD*16/25 RtpfWind Baffle Dimension Dimensions --- Inches Unit BaffleDimensions --- MM Unit Baffle Wind Baffles Fabrication 15 Ton Wind Baffle Brackets Fabrication Front Front Back Left Right Catalog No 38AU---09SI START-UP Checklist II. PRE-START-UP Outdoor UnitCheck Voltage Imbalance
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