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38MHRCQ24AA3
Carrier 38MHRCQ24AA3 User Manual
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54
Sp
ecif
ic
ati
ons
sub
ject
to c
hange
wit
hout
noti
ce.
S
G-38M
HRC-01
DISASSEMBL
Y
INSTRUCTIONS SIZE 24K
Procedur
e
Illustration
1)
T
ur
n o the air conditioner and the
power breaker
.
2)
Remove the big handle screw
and then remove the big handle.
3)
Remove the top cover screws (3)
and then remove the top cover.
One of the screws is located
underneath the big handle.
Big Handle
T
op Cover
53
55
Table of Contents
Table of Contents
1
Safety Considerations
1
Introduction
1
Model / Serial Number Nomenclatures
2
Compatibility
3
Specifications (Heat Pump)
3
Performance
4
Size 12K
5
Dimensions and Weights
5
Sizes 9K-12K
6
Size 18K
7
Size 24K
8
Clearances for Multiple Units
9
Recommended Connection Method for Power and Communication Wiring
10
Electrical Data
10
Connection Diagram 9K-24K
11
Wiring Diagram Size 12K
12
Wiring Diagrams (Heat Pump)
12
Wiring Diagram Sizes 9-18K
13
Wiring Diagram Size 24K
14
Size 12K - 115V and 208/230V
15
Refrigeration Cycle Diagrams
15
Size 9K - 208/230V
16
Size 18K - 208/230V
17
Size 24K - 208/230V
18
General Refrigerant Line Sizing
19
Long-Line Applications
19
Piping and Refrigerant Information
19
System Vacuum and Charge
20
Using Vacuum Pump
20
Deep Vacuum Method
20
System Evacuation and Charging
20
Electronic Functions
21
Abbreviation
21
Main Protection
21
Operation Modes and Functions
21
Outdoor Fan Running Rules
22
HEATING Mode
22
Compressor Temperature Protection
22
Indoor Fan Running Rules
22
Auto Fan Action in the HEATING Mode
23
Forced DEFROSTING Mode
24
Defrost Exit Conditions
24
Defrost Chart
24
FORCED OPERATION Function
25
Evaporator Coil Temperature Protection
25
AUTO Mode
25
Operation Rules
25
Enquiry Information
26
Point Check Function
26
Safety
27
Electrolytic Capacitors
27
Discharge Position
27
Troubleshooting
27
Outdoor Unit Diagnostic Guide
28
PCB Diagrams
29
Sizes 09-12K
29
Sizes 18-24K
30
LED Codes
30
Outdoor PCB
31
Indoor PCB
31
EEPROM Parameter Error
31
Diagnosis and Solution
31
Indoor and Outdoor Unit Communication Error
32
Test the DC Voltage
33
Test the Reactor Resistance
33
Zero Crossing Detection Error Diagnosis and Solution
34
The Indoor Fan Speed Is Operating Outside of the Normal Range
35
Index 1
36
Motor Connector
36
DC Motor Voltage Input and Output
36
Open/Short Circuit of Temperature Sensor Diagnosis and Solution
37
Check the Connection
37
Refrigerant Leakage Detection Diagnosis and Solution
38
Overload Current Protection Diagnosis and Solution
39
IPM Malfunction or IGBT Over-Strong Current Protection Diagnosis
40
P-U
41
P-V
41
P- W
42
N-U
42
N-V
43
N-W
43
Over Voltage or too Low Voltage Protection Diagnosis and Solution
44
High Temperature Protection of Compressor Top Diagnosis and Solution
45
Temperature Sensor Checking
46
Main Parts Check
46
Inverter Compressor Drive Error Diagnosis and Solution
46
Compressor Checking
47
IPM Continuity Check
48
Fan Motor
48
Pressure on the Service Port
49
Cooling Chart
49
Heating Chart
50
Disassembly Instructions Sizes 9K (115V) - 18K (208/230V)
51
Disassembly Instructions Sizes 24K
54
Temperature Sensor Resistance Value Table for T1, T2, T3, T4
57
Appendix
57
Temperature Sensor Resistance Value Table for T5
58
5
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Carrier 38MHRCQ24AA3 Specifications
General
Brand
Carrier
Model
38MHRCQ24AA3
Category
Air Conditioner
Language
English
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