Carrier 38MGRQ18B 3 Series - EXV CHECK; EXV Coil Resistance Measurement

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38MGR-04SM Specifications subject to change without notice. 69

EXV Check

1. Disconnect the connectors.

Fig. 73 — Disconnect the connectors

Fig. 74 — Disconnect the connectors

Table 40 — Resistance to EXV Coil

LEAD WIRE COLOR NORMAL VALUE

Red - Blue

About 50Ω

Red - Yellow

Brown - Orange

Brown - White

Main Page

Table of Contents1
Safety Considerations1
Introduction1
Unit Sizes2
Model / Serial Number Nomenclatures2
Specifications3
Dimensions4
- Size 24K5
- Size 30K5
- Size 36K6
- Size 48K7
- Clearances for Multiple Units8
Clearances8
Electrical Data9
Wiring9
- Size 18K 2 Zone10
- Size 24K 3 Zone10
Connection Diagrams10
- Size 30K 4 Zone11
- Size 36K 4 Zone11
- Size 48K 5 Zone12
Automatic Wiring/Piping Correction13
Size 18K14
Wiring Diagrams14
- 36K - 4 Zone Max19
- Wiring Diagram 48K - 5 Zone Max20
- 48K - 5 Zone Max21
Refrigeration Cycle Diagrams22
- Piping and Refrigerant24
- Additional Charge Table Per Zone24
- General Refrigerant Line Sizing24
Refrigerant Lines24
- System Vacuum and Charge25
- Using Vacuum Pump25
- Deep Vacuum Method25
System Evacuation and Charging25
- Electric Control Working Environment26
- Main Protection26
- Compressor Current Limit Protection26
Electronic Function26
- Low Outdoor Ambient Temperature Protection27
- Controls and Functions27
- Outdoor Unit Anti-Freezing Protection27
- Oil Return27
- High Condenser Coil Temperature Protection27
- Heating Mode28
- Defrosting Control28
- Defrosting Conditions28
- Defrosting Actions28
- End Defrosting Action29
- Outdoor Fan Control29
- Cooling Mode29
- Electronic Expansion Valve (EXV) Control29
- Four-Way Valve Control30
- Diagnostic Guides31
- Outdoor Unit Digital Display31
Troubleshooting31
Outdoor Unit Point Function32
Outdoor Unit Digital Display32
- Diagnosis and Solution34
- Indoor Fan Speed Has Been out of Control (E0/E4)34
- Indoor Units Mode Conflict (P5)35
- EEPROM Parameter Error (EO/E4)36
- EEPROM Chip36
- Communication Malfunction between the Indoor and Outdoor Units (E2/E1)37
- Test the DC Voltage38
- IPM (for Dual/Tri-Zone)38
- IPM for Four or Five Zone39
- Main Board39
- Zero Crossing Detection Error Diagnosis and Solution (E2)40
- IPM Board (for 2-Zone/3-Zone)45
- Bridge Rectifier (for 2-Zone/3-Zone)45
- Bridge Rectifier (for 2-Zone/3-Zone) and IPM Module46
- IPM Board (for 4-Zone)46
- Bridge Rectifier (for 5-Zone)47
- IPM Module (for 5 - Zone)47
- PFC Module Protection Error Diagnosis and Solution (E6)48
- Inductance49
- Outdoor Fan Speed Has Been out of Control (E8)50
- DC Fan Motor (Control Chip Is Inside Fan Motor)51
- Test the Voltage51
- Temperature Protection of Compressor Top) Error (PO)52
- High Pressure Protection Error (P1)54
- Low Pressure Protection Error (P2)56
- Current Protection of Compressor Error (P3)58
- Temperature Protection of Compressor Discharge Error (P4)60
- High Temperature Protection of Condenser Error (P5)61
- IPM Module Protection Error (P6)62
- Temperature Sensor Resistance Value (C-K)64
Appendices64
- Unit C Discharge Temperature Sensor65
- Compressor Check66
- Measure the Resistance66
- IPM Continuity Check67
- AC Fan Motor67
- Resistance Value67
- 4-Way Valve68
- Resistance to EXV Coil69
- EXV Check69
- Disconnect the Connectors69
Disassembly Instructions Size 1872
- How to Remove the Reactor78
- How to Remove the 4-Way Valve78
- How to Remove the Expansion Valve79
- How to Remove the Panel Plate80
Disassembly Instructions Size 2480
- How to Remove the Fan Assembly83
- How to Remove the Electrical Parts84
- How to Remove the Compressor86
Disassembly Instructions Size 3089
Disassembly Instructions Sizes 36 and 4896

Carrier 38MGRQ18B 3 Series - EXV CHECK; EXV Coil Resistance Measurement

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