Carrier 38MARBQ12AA3 - PCB Board 12

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106 Specifications subject to change without notice. SG-38MARB-01

PCB Board 12

Procedure Illustration

1) Loosen the hooks (4 ), then open the

electronic control box cover.

2) Remove the screws (6) on the

electronic control board, then

turn over the electronic control

board.

Main Page

Table of Contents1
Introduction1
Unit Sizes2
Model / Serial Number Nomenclatures2
Specifications - Heat Pump3
Dimensions and Weights4
Clearances for Multiple Units7
Clearances7
Recommended Connection Method for Power and Communication Wiring8
Electrical Data8
Wiring8
Connection Diagrams9
Wiring Diagram Size 12K (115V)10
Wiring Diagrams10
Fan and Motor Specifications14
Refrigeration Cycle Diagrams15
- Refrigerant Cycle Diagrams 9K (208/230V)16
- Refrigerant Cycle Diagram 12K (208/230V)17
- Refrigerant Cycle Diagram 18K (208/230V)18
- Long Line Applications22
- General Refrigerant Line Sizing22
Refrigerant Lines22
- System Vacuum and Charge23
- Using Vacuum Pump23
- Deep Vacuum Method23
System Evacuation and Charging23
- Main Protection24
- Outdoor Fan Running Rules24
- Inverter Module Protection24
Electronic Functions24
- Evaporator Temperature Protection25
- Indoor Fan Running Rules25
- Compressor Temperature Protection25
- DEFROST Mode27
- Forced DEFROSTING Mode27
- Evaporator Coil Temperature Protection28
- DRYING Mode28
- FORCED OPERATION Function28
- Enquiry Information29
Point Check Function29
- Electrolytic Capacitors30
- Discharge Position30
- Safety30
Troubleshooting30
Indoor Unit Diagnostic Guides31
- Outdoor Unit Error Display32
- Sizes 12 (115V)32
Diagnosis and Solution32
- Indoor and Outdoor Unit Communication Error (EL01)34
- Zero Crossing Detection Error Diagnosis and Solution (EH02)36
- The Indoor Fan Speed Is Operating Outside of the Normal Range (EH03)37
- DC Fan Motor (Control Chip Is in the Fan Motor)38
- The Outdoor Fan Speed Is Operating Outside of Normal Range (EC07)39
- Outdoor DC Fan Motor (DC Motor that Controls the Chip on the PCB)40
- Refrigerant Leakage Detection (EL0C)43
- Indoor Pcb/Display Board Communication Error (EH06)44
- Current Overload Protection (PC08)45
- IPM Malfunction or IGBT Over-Strong Current Protection (PC00)46
- IPM Continuity Check47
- Compressor Check48
- Over Voltage or Low Voltage Protection (PC01)49
- Inverter Compressor Drive Error (PC04)52
- Low Pressure Protection (PC03)53
- Indoor Units Mode Conflict (Match with Multi Outdoor Unit)54
- Check Procedures56
- Temperature Sensor Check56
- Resistance Value57
- Way Valve Check59
- Measure the Voltage59
- Use a Digital Tester to Measure Resistance59
- EXV Check60
- Winding Colors60
- Main Parts Check61
- Temperature Sensor Checking61
- Pressure on Service Port62
- Cooling Chart62
- Heating Chart (R410A)63
- System Pressure64
- System Pressure Table-R410A64
- Outdoor Unit Sizes 9-12K (115V) Panel Plate65
Disassembly Instructions65
- PCB Board 392
- Four Way Valve (for Heat Pump Models)110
- Compressor111
- Safety Caution113
- Temperature Sensor Resistance Value Table for T1, T2, T3, T4114
- Temperature Sensor Resistance Value Table for T5115

Carrier 38MARBQ12AA3 - PCB Board 12

Table of Contents

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