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B-VMH12SU-1
Century B-VMH12SU-1 User Manual
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Ser
vice Manual
VMH 9/12/18/24 SU Series
VMH 30/36 SD Series
Inverter Single Zone
Ductless Mini-Split
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Table of Contents
Default Chapter
1
Service Manual
1
Table of Contents
2
Safety Precaution
3
Warning
3
2 Part Names and Functions
5
Model Names of Indoor/Outdoor Units
5
Part Names of Indoor/Outdoor Units
6
3 Dimension
7
Indoor Unit
7
Outdoor Unit
9
4 Refrigerant Cycle Diagram
10
Wiring Diagram
11
Initial Installation
12
Adding the Refrigerant after Running the System for Many Years
12
Air Purging with Vacuum Pump
12
Procedure
12
Re-Installation if the Indoor Unit Has Been Repaired
13
Evacuation for the Whole System
13
Refrigerant Charging
14
6 Installation Details
11
Wrench Torque Sheet for Installation
11
Connecting the Cables
11
Pipe Length and the Elevation
11
7 Operation Characteristics
15
8 Electronic Function
16
Abbreviation
16
Display Function
16
Icon Explanation on Indoor Display Board
16
Main Protection
17
Operation Modes and Functions
18
Fan Mode
18
Cooling Mode
18
Heating Mode
18
Auto-Mode
19
Drying Mode
20
Forced Operation Function
20
Auto-Restart Function
20
Refrigerant Leakage Detection
20
Point Check Function
21
9 Troubleshooting
23
Electrolytic Capacitors
23
Safety
23
Indoor Unit Error Display
24
Outdoor Unit Error Display
25
IPM Board
27
Diagnosis and Solution
28
EEPROM Parameter Error Diagnosis and Solution
28
Indoor/Outdoor Unit’s Communication Diagnosis and Solution
29
Zero Crossing Detection Error Diagnosis and Solution
31
Fan Speed Has Been out of Control Diagnosis and Solution
32
Indoor AC Fan Motor
33
Indoor or Outdoor DC Fan Motor
33
Outdoor DC Fan Motor
33
Open/Short Circuit of Temperature Sensor Diagnosis and Solution
34
Refrigerant Leakage Detection Diagnosis and Solution
35
Overload Current Protection Diagnosis and Solution
36
IPM Malfunction/Igbt Over-Strong Current Protection Diagnosis/Solution
37
Over Voltage/Too Low Voltage Protection Diagnosis and Solution
42
High Temperature Protection of IPM Module Diagnosis/Solution
43
Inverter Compressor Drive Error Diagnosis and Solution
44
IPM Continuity Check
45
Low Pressure Protection Diagnosis and Solution
47
Main Parts Check
48
Temperature Sensor Checking
48
Temperature Sensor Resistance Value Table for T1,T2,T3,T4
49
Temperature Sensor Resistance Value Table for TP
50
Compressor Checking
53
Cooling Chart
55
Pressure on Service Port
55
Heating Chart
56
10 Disassembly Instructions
57
Front Panel
57
Indoor Unit
57
Electrical Parts
58
Evaporator
59
Fan and Motor
60
Outdoor Unit
61
Panel Plate
61
Fan Assembly
62
Compressor
65
Four-Way Valve
65
Fan Ass’y
73
4
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Century B-VMH12SU-1 Specifications
General
BTU
12000
Cooling Area
550 sq. ft.
Refrigerant
R410A
Net Weight (Indoor Unit)
22 lbs
Type
Mini Split
Power Consumption (Cooling)
1.1 kW
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