Carrier 40MVQ, 40MVC, 38MVQ, 38MVC service manual 9K & 12K Units, 18K & 24K Units

Page 43

A7 - Fuse Chart

Unit Size

 

Fuse Rating (Amps/Volts)

 

Indoor

Outdoor

Outdoor

 

009

---

3.15A/250V

2A/250V

012

---

3.15A/250V

2A/250V

018

3.15A/250V

3.15A/250V

---

024

3.15A/250V

3.15A/250V

---

The 3.15A fuses protect the board against the indoor or outdoor fan motors.

 

 

The 2A fuses protect the board against a Class II circuit board failure.

 

 

A8 - Indoor Unit Diagnostic Guides

9K & 12K Units

Operation

Timer

Failure Mode

Diagnostic

Lamp

Lamp

Chart

 

l

X

Indoor fan speed has been out of control for over 1 minute

1

l

On

Indoor room temp. or evaporator sensor is open circuit or short circuited

2

X

l

Compressor over--- current protection has been activated four times

3

On

l

EPROM error*

---

l

l

Indoor unit communication error (Illuminates simultaneously)

4

 

 

 

 

18K & 24K Units

 

 

 

 

 

 

 

Opera-

Timer

Defrosting

Auto

 

Diagnostic

tion

Failure Mode

Lamp

Lamp

Lamp

Chart

Lamp

 

 

 

 

 

 

l

l

l

l

Over--- current protection of the compressor occurs four times

3

X

l

X

X

Indoor room temp. sensor is open circuit or short circuited

2

l

X

X

X

Temp. sensor on indoor evaporator is open circuit or short circuited

2

X

X

l

X

Temp. sensor on outdoor condenser is open circuit or short circuited (not

2

cooling only modes)

 

 

 

 

 

X

X

l

l

Outdoor unit protects (outdoor temp. sensor, phase order, etc.)

5

X

l

X

l

EPROM error*

---

X

X

X

l

Indoor unit communication error

6

l= Flashing

X = Off

* = Replace Indoor Board

Infrared signal receptor

Infrared signal receptor

 

 

 

 

 

OPERATION AUTO

TIMER

PRE.-DEF.

OPERATION AUTO

TIMER OPERATION

 

 

 

TIMER

 

 

 

 

PRE-DEF

 

 

A07546a

ECON

PRE-DEF

 

 

 

 

A07544

 

 

 

 

A07545a

 

 

 

Model size 009

Model size 012

Model size 018-024*

*PRE-DEF light will illuminate when the unit is running in FAN ONLY mode on Cooling Only units.

Fig. 34 – LED Display Panel

38/40MVC, MVQ

A9 - Outdoor Unit Diagnostic Guides

Flashing

 

 

Diagnostic

Times after 2

 

Failure Mode

 

Chart

Second Off

 

 

 

 

 

5

Communication failure

 

4 or 6

2

Condenser temperature sensor failure

 

2

1

Other indoor failure

 

If the unit is operating normally, the LED light on the outdoor board is lit continuously. If there is a failure, the LED light will flash a specific number of times. Refer to the Outdoor Unit Diagnostic table above to determine failure.

43

Image 43
Contents Introduction 38MVC/40MVC 38MVQ/40MVQIndoor Unit Model Number NomenclatureStandard Features and Accessories System Model Number Specifications Cooling only UnitsCoil Outdoor Specifications Heat Pump UnitsService Valve Locations Clearances Indoor System Operating Envelope 53MVC/MVQ System Operating Envelope ChartElectrical Data Connection Diagrams Connection DiagramsWiring Diagram 38MVC009----1 W/ 40MVC009----1 Wiring DiagramsWiring Diagram 38MVC012----1 W/ 40MVC012----1 Wiring Diagram 38MVC012----3 W/ 40MVC012----3 Wiring Diagram 38MVC018----3 W/ 40MVC018----3 Wiring Diagram 38MVQ009----1 W/ 40MVQ009----1 Wiring Diagram 38MVQ012----1 W/ 40MVQ012----1 Wiring Diagram 38MVQ012----3 W/ 40MVQ012----3 Cooling Refrigeration Cycle DiagramGeneral refrigerant line sizing Refrigerant LinesRefrigerant Charge System Evacuation and Charging Using Vacuum PumpCompressor Overcurrent Protection Minute Time DelayControl System System SafetiesIndoor Coil Freeze Protection Condenser High Temperature ProtectionIndoor High Temperature Protection Sequence of OperationModes of Operation Defrost Auto FanManual Operation Dry Dehumidification ModeForced Cooling Operation Recommended Steps TroubleshootingDiagnostic Hierarchy Required ToolsYes Chart 1 Indoor FAN Speed OUT of ControlChart 2 Temperature Sensor Chart 3 Compressor Overcurrent Protection Chart 4 Indoor Unit Communication Error Size 9K and 12K Chart 5 Outdoor Unit Protects Chart 6 Indoor Unit Communication Error Size 18K and 24K Chart 7 Unit not RUNNING, no Diagnostic Code Chart 8 Unit not Running Optimally Chart 9 Unit not Running Optimally HP in Heating Chart 10 Compressor Chart 11 Outdoor Motor Chart 13 Receiver Board Chart 12 Reversing ValveAppendix Appendix Table of Contents Description Number38MVQ009---1/38MVQ012--- --- ---1 Control Board 38MVC009--- --- ---1/38MVC012--- --- ---1 Control BoardInput or Output Value 40MVC009--- --- ---1/40MVC012--- --- ---1 Control Board40MVQ012--- --- ---3 Control Board 38MVC012--- --- ---3 Control Board40MVC012--- --- ---3 Control Board 38MVQ012--- --- ---3 Control BoardControl Board 38MVC018--- --- ---3 Control BoardTemp. ˚F/˚C Resistance KΩ A6 Characteristics of Temperature Sensor18K & 24K Units 9K & 12K UnitsCatalog No.38---40MV---1SM
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40MVQ, 40MVC, 38MVQ, 38MVC specifications

The Carrier 38MVC, 38MVQ, 40MVC, and 40MVQ are advanced air-conditioning systems designed for both residential and commercial applications. These units are recognizable for their commitment to efficiency, reliability, and comfort, making them ideal choices for various environments.

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