Thermal Zone 9H47YIMI User manual

953-0131 07/22/2021
SINGLE ZONE
MINISPLIT
SERVICE MANUAL
For the following models:
9H47YIMI 9H47YOMI
12H47YIMI 12H47YOMI
12H47ZIMI 12H47ZOMI
18H47ZIMI 18H47ZOMI
24H46ZIMI 24H46ZOMI
30H48ZIMI 30H48ZOMI
36H46ZIMI 36H46ZOMI

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Table of Contents
1. Precaution .........................................................................................................................................................................5
1.1 Safety Precaution ....................................................................................................................................................5
1.2 Warning ...................................................................................................................................................................5
1.3 Caution ....................................................................................................................................................................6
1.4 Operational..............................................................................................................................................................6
2. Model/Part Names and Definitions ..................................................................................................................................7
2.1 Model Names and Definition...................................................................................................................................7
2.2 Part Names ..............................................................................................................................................................8
2.3 Function/Feature Names and Definition.................................................................................................................8
3. Dimension .........................................................................................................................................................................9
3.1 Indoor Unit ..............................................................................................................................................................9
3.2 Outdoor Unit .........................................................................................................................................................12
4. Refrigerant Cycle Diagram & Performance.....................................................................................................................13
4.1 Refrigerant Cycle Diagram.......................................................................................................................................13
4.2 Performance Data ...................................................................................................................................................15
4.2.1 Cooling .................................................................................................................................................................15
4.2.2 Heating.................................................................................................................................................................16
5. Wiring Diagram ...............................................................................................................................................................17
5.1 Indoor Unit ............................................................................................................................................................17
5.2 Outdoor Unit .........................................................................................................................................................18
6. Installation Details...........................................................................................................................................................22
6.1 Wrench Torque Sheet............................................................................................................................................22
6.2 Cable Connection Sheet ........................................................................................................................................22
6.3 Pipe Size, Length, and Elevation............................................................................................................................22
6.4 First Time Installation............................................................................................................................................23
6.4.1 Gas Leak Check (Soap Water Method)...............................................................................................................23
6.4.2 Air Purging with a Vacuum Pump.......................................................................................................................23
6.5 Adding Refrigerant for a Used System ..................................................................................................................24
6.6 Re-installation of the Indoor Unit..........................................................................................................................26
6.6.1. Collecting the Refrigerant into the Outdoor Unit .............................................................................................26
6.7 Re-installation of the Outdoor Unit.......................................................................................................................27
6.7.1 Evacuation for the Whole System......................................................................................................................27
6.7.2 Refrigerant Charging ..........................................................................................................................................28
7. Operation Characteristics................................................................................................................................................29
8. Electronic Functions........................................................................................................................................................30
8.1 Abbreviation..........................................................................................................................................................30

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8.2 Display Function ....................................................................................................................................................30
8.3 Protection Features...............................................................................................................................................30
8.4 Operation Modes and Logic ..................................................................................................................................32
8.4.1 Fan Mode ...........................................................................................................................................................32
8.4.2 Cooling Mode.....................................................................................................................................................32
8.4.3 Heating Mode.....................................................................................................................................................33
8.4.4 AUTO Mode........................................................................................................................................................35
8.4.5 Drying Mode.......................................................................................................................................................36
8.4.6 Emergency Operation Function ........................................................................................................................36
8.4.7 Timer Function ...................................................................................................................................................36
8.4.8 Sleep Function....................................................................................................................................................36
8.4.9 Auto-Restart Function........................................................................................................................................37
8.4.10 Refrigerant Leakage Detection ..........................................................................................................................37
8.4.11 Louver Position Memory Function.....................................................................................................................37
8.4.12 Freezing Protection..........................................................................................................................................37
8.4.13 Self Clean Function.............................................................................................................................................37
8.4.14 Follow Me ..........................................................................................................................................................37
8.4.15 Silence Operation...............................................................................................................................................38
8.4.16 Temperature Differential Selection .................................................................................................................38
8.4.16 Point Check Function .........................................................................................................................................39
8.5 Set-Up Changing Function.......................................................................................................................................41
8.5.1 Set-up Steps .......................................................................................................................................................41
8.5.1 Set-up Manual....................................................................................................................................................41
9. Troubleshooting ..............................................................................................................................................................43
9.1 Indoor Unit Error Codes ........................................................................................................................................44
9.2 Diagnosis and Solution ..........................................................................................................................................45
9.2.1 E0/F4: EEPROM Parameter Error.....................................................................................................................45
9.2.2 E1: Indoor/Outdoor Communication Error ......................................................................................................46
9.2.3 E2: Zero-Crossing Detection Error....................................................................................................................48
9.2.4 E3/F5: Fan Speed Out of Control Error ..............................................................................................................49
9.2.5 E4/E5/F1/F2/F3: Temperature Sensor Open or Short Circuit Error ................................................................51
9.2.6 EC: Refrigerant Leak Detection.........................................................................................................................52
9.2.7 F0: Overload-current Protection ......................................................................................................................53
9.2.8 P0: IPM Malfunction or IGBT Over-current Protection....................................................................................54
9.2.8 P1: High or Low Voltage Protection .................................................................................................................59
9.2.9 P2: High Temperature Protection of Compressor Top.....................................................................................60
9.2.10 P4: Inverter Compressor Drive Error..............................................................................................................61
9.2.10 P6: Low Pressure Protection Diagnosis and Solution.....................................................................................63
9.3 General Testing and Measurements .....................................................................................................................64
9.3.1 Compressor Check..............................................................................................................................................64
9.3.2 Temperature Sensor Check................................................................................................................................65

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9.3.3 IPM Continuity Check.........................................................................................................................................68
9.3.4 Outdoor AC Fan Motor Check............................................................................................................................68
9.3.5 Voltages on P and N ...........................................................................................................................................69
9.3.6 Pressure on Service Port ....................................................................................................................................70
10. Unit Disassembly...........................................................................................................................................................72
10.1 Indoor Unit ..........................................................................................................................................................72
10.1.1 Accessing the Terminal Block...........................................................................................................................72
10.1.2 Removing the Front Cover Housing .................................................................................................................73
10.1.3 Removing the Indoor PCB ................................................................................................................................75
10.1.4 Removing the Electronics Box..........................................................................................................................78
10.2 Outdoor Unit .......................................................................................................................................................79
10.2.1 Removing the Outdoor PCB .............................................................................................................................79

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1. Precaution
−Installation MUST conform with local building codes or, in the absence of local codes, with the National Electrical
Code NFPA70/ANSI C1-1993 or current edition and Canadian Electrical Code Part1 CSA C.22.1.
−The information contained in the manual is intended for use by a qualified service technician familiar with safety
procedures and equipped with the proper tools and test instruments.
−Installation or repairs made by unqualified persons can result in hazards to you and others.
−Failure to carefully read and follow all instructions in this manual can result in equipment malfunction, property
damage, personal injury, and/or death.
−This service manual is only intended for the service engineer to use.
1.1 Safety Precaution
•To prevent injury or damage to the user, other people, or property, the following instructions
must be followed.
•Incorrect operation due to ignoring instructions may cause harm or damage.
•Before servicing the unit, be sure to read this service manual first.
1.2 Warning
•Do not use a defective or underrated circuit breaker. Use this appliance on a dedicated circuit.
•For electrical work, contact the dealer, seller, a qualified electrician, or an authorized service
center.
•Always ground the product.
•Install the panel and the cover of the control box securely.
•Always install a dedicated circuit and breaker.
•Use a properly rated breaker and fuse.
•Do not let the air conditioner run for a long time when the humidity in the area is high or if a door
or window is left open.
•Do not touch or operate the product with wet hands.
•Do not place a heater or other appliance near the power cable.
•Do not allow water to run into electrical parts.
•Do not store or use flammable gas or combustibles near the product.
•Do not use the product in a tightly closed space for a long time. (oxygen deficiency)
•When flammable gas leaks, turn off the gas and open a window for ventilation before turning the
product back on.
•If strange sounds or smoke comes from the product, turn the breaker off or disconnect the power
supply cable.
•Stop operation and close the window during storms or hurricanes.
•Do not open the inlet grill of the product during operation.
•When the product is soaked, contact an authorized service center.
•Be careful to prevent water from entering the product.

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•Turn the main power off when cleaning or maintaining the product.
•When the product is not used for a long time, disconnect the power supply plug or turn off the
breaker.
•Do not step on the outdoor unit.
1.3 Caution
•Always check for gas (refrigerant) leakage after installation or repair of product.
•Install the drain hose to ensure that water is drained away properly.
•Keep level even when installing the product.
•Do not install the product where the noise or hot air from the outdoor unit could cause damage
to harm to neighbors or other property.
•Use two or more people to lift and transport the product.
•Do not install the product where it will be directly exposed to sea wind (salt spray). Commercial
coatings may be used to protect outdoor unit, if necessary.
1.4 Operational
•Do not use the product for special purposes, such as preserving foods, works of art, etc. It is a
consumer air conditioner, not a precision refrigeration system.
•Do not block the inlet or outlet of air flow.
•Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.
•Do not touch the metal parts of the product when removing the air filter. They are very sharp.
•Do not step on or put anything on the product (outdoor units).
•Always insert the filter securely. Clean the filter every two weeks or more often if necessary.
•Do not insert hands or other objects through air inlet or outlet while the product is operating.
•Do not drink the water drained from the product.
•Use a firm stool or ladder when cleaning or maintaining the product.
•Do not mix old and new batteries or different types of batteries.
•Do not recharge or disassemble the batteries. Do not dispose of batteries in a fire.
•If the liquid from the batteries gets onto your skin or clothes, wash it well with clean water. Do
not use the remote if batteries have leaked inside.

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2. Model/Part Names and Definitions
2.1 Model Names and Definition
A A H X X C D X X
Example: 1 2 H 4 7 Y I M I
AA –BTU capacity
H –heat pump
C –Rated Voltage
Y: 115V
Z: 230V
D –Type of unit
I: Indoor unit
O: Outdoor unit
X –Internal Code
Indoor
Outdoor
Voltage (V)
Capacity (BTU)
Heat Pump
9H47YIMI
9H47YOMI
115
9,000
X
12H47YIMI
12H47YOMI
12,000
X
12H47ZIMI
12H47ZOMI
230
X
18H47ZIMI
18H47ZOMI
18,000
X
24H46ZIMI
24H46ZOMI
24,000
X
30H48ZIMI
30H48ZOMI
30,000
X
36H46ZIMI
36H46ZOMI
36,000
X

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2.2 Part Names
2.3 Function/Feature Names and Definition
Indoor Unit
•Air Freshening Filter –Eliminate formaldehyde and other volatile organic compounds as well as harmful
gases and odors.
•Follow Me –With this feature, a temperature sensor is built into the remote control. The unit will use that
temperature sensor for the ambient temperature so the air conditioner is following the user.
•Louver Position Memory Function –When starting the unit again after shutting down, its louver will return
to the angle that was previously set by the user.

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Outdoor Unit
•Refrigerant leak detection –The refrigerant leak detection function can better prevent the compressor
from being damaged by the leaked refrigerant or compressor overload.
•Self-diagnosis Function –The air conditioner’s control board will shut off the unit if there is any abnormal
operation or parts failure and display a corresponding error code for the potential cause of the problem.
•Compressor Crankcase Heater –Oil easily dissolves in refrigerant, especially in low temperature conditions.
The crankcase heating belt can heat the bottom of the compressor to avoid pumping out too much oil
with the refrigerant, which also protects the compressor.
•Freezing protection –In heating mode, the set temperature can be set to 46°F (8°C) to prevent pipes, etc.
from freezing when the house is unoccupied for a long time severe cold weather.
3. Dimension
3.1 Indoor Unit
Model
W
D
H
9H47YIMI
28.43”
(722 mm)
7.36”
(187 mm)
11.42”
(290 mm)
12H47YIMI
31.57”
(802 mm)
7.44”
(189 mm)
11.69”
(297 mm)
12H47ZIMI
18H47ZIMI
37.99”
(965 mm)
8.46”
(215 mm)
12.56”
(319mm)
24H46ZIMI
42.52”
8.9”
13.19”

10
(1080 mm)
(226 mm)
(335 mm)
30H48ZIMI
49.57”
(1259 mm)
11.1”
(282 mm)
14.25”
(362 mm)
36H46ZIMI

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Mounting Plate for Models: 9H47YIMI, 12H47YIMI, 12H47ZIMI
Mounting Plate for models: 18H47YIMI, 24H46ZIMI
Mounting Plate for models: 30H48ZIMI, 36H46ZIMI
7.56" 9.13"
5.04"
1.7"
Right rear wall
hole 2.5"
Indoor Unit
Outline
28.43" (9K) / 31.57"(12K)
1.7"
1.7"
11.7"
Left rear wall
hole 2.5"
8.6"
22.87"
13.2"
37.99"(18K) / 42.52"(24K)
2.1"
1.85"
3" 2.1"
1.85”
5.85"
5.95"
6.86"
Indoor Unit
Outline
Right rear wall
hole 2.5"
Left rear wall
hole 2.5"
11.8"
6.8"
14.25"
49.57"
Indoor Unit
Outline
2.05"
15.3" 13.07" 10.1"
2.05"
Right rear wall
hole 2.5"
Left rear wall
hole 2.5"

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3.2 Outdoor Unit
More than 60cm(23.6in)
More than 70cm(27.6in)
More than 30cm(11.8in)
More than 60cm(23.6in)
(Service space)
Fence or
obstacles
More than 30cm(11.8in)
NOTE: The drawing above is for reference only. The appearance of actual units may be different.
Model
W
D
H
W1
A
B
9H47YOMI
30.31”
(770 mm)
11.81”
(300 mm)
21.85”
(555 mm)
32.40”
(823 mm)
20.87”
(530 mm)
11.42”
(290 mm)
12H47YOMI
12H47ZOMI
18H47ZOMI
31.50”
(800 mm)
13.11”
(333 mm)
21.81”
(554 mm)
32.40”
(823 mm)
20.87”
(530 mm)
11.42”
(290 mm)
24H46ZOMI
33.27”
(845 mm)
14.29”
(363 mm)
27.64”
(702 mm)
34.41”
(874 mm)
21.61”
(549 mm)
12.80”
(335 mm)

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30H48ZOMI
37.24”
(946 mm)
16.54”
(420 mm)
31.89”
(810 mm)
40.55”
(1030 mm)
26.50”
(673 mm)
15.87”
(403 mm)
36H46ZOMI
4. Refrigerant Cycle Diagram & Performance
4.1 Refrigerant Cycle Diagram
For models: 9H47YOMI, 12H47YOMI, 12H47ZOMI, 18H47ZOMI, 24H46ZOMI
LIQUID SIDE
GAS SIDE
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
COMPRESSOR
2-WAY VALVE
3-WAY VALVE
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
T1 Room temp.
sensor
ACCUMULATOR
INDOOR OUTDOOR
CHECK VALVE
(Heating Model only)
CAPILIARY TUBE

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For models: 30H48ZOMI, 36H46ZOMI
LIQUID SIDE
GAS SIDE
HEAT
EXCHANGE
(EVAPORATOR) HEAT
EXCHANGE
(CONDENSER)
Compressor
2-WAY VALVE
3-WAY VALVE
4-WAY VALVE
COOLING
HEATING
T2 Evaporator
temp. sensor
T1 Room temp.
sensor
T3 Condenser
temp. sensor
T5 Discharge
temp. sensor
T4 Ambient
temp. sensor
INDOOR OUTDOOR
Electronic
expansion valve
Accumulator

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4.2 Performance Data
4.2.1 Cooling
NOTE: Based on an indoor temperature of 80°F.
Actual capacity may vary from test results shown below.
8629 9352 9000
7500
0
2000
4000
6000
8000
10000
75F 85F 95F 105F
Capacity (BTU)
Outdoor Temoerature (°F)
9K
80F
11104
12728 12000 9935
0
2000
4000
6000
8000
10000
12000
14000
75F 85F 95F 105F
Capacity (BTU)
Outdoor Temoerature (°F)
12K
80F
17052
18900 18000
15243
0
5000
10000
15000
20000
75F 85F 95F 105F
Capacity (BTU)
Outdoor Temoerature (°F)
18K
80F
22540
24485 24000 20152
0
5000
10000
15000
20000
25000
30000
75F 85F 95F 105F
Capacity (BTU)
Outdoor Temoerature (°F)
24K
80F
25620 30250 30000 26520
0
5000
10000
15000
20000
25000
30000
35000
75F 85F 95F 105F
Capacity (BTU)
Outdoor Temoerature (°F)
30K
80F
34253 36256 36000
29250
0
5000
10000
15000
20000
25000
30000
35000
40000
75F 85F 95F 105F
Capacity (BTU)
Outdoor Temoerature (°F)
36K
80F

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4.2.2 Heating
NOTE: Based on the indoor temperature of 55°F / 70°F.
Actual capacity may vary from test results shown below.
10615 10000 8870 7739
6184
4629 3925
103029800 8659 7518
5963
4408 3802
0
2000
4000
6000
8000
10000
12000
57F 47F 35F 17F 5F -5F -13F
Capacity (BTU)
Outdoor Temoerature (°F)
9K
55F
70F
12946 12516
11231
9042
6852
5213 4423
12383 12000
10524
8480
6435
4923 4235
0
2000
4000
6000
8000
10000
12000
14000
57F 47F 35F 17F 5F -5F -13F
Capacity (BTU)
Outdoor Temoerature (°F)
12K
55F
70F
19021 18952
16084
13215
10620
8025
4632
18523
18000
15274
12547
10116
7685
4425
0
2000
4000
6000
8000
10000
12000
14000
16000
18000
20000
57F 47F 37F 17F 5F -5F -13F
Capacity (BTU)
Outdoor Temoerature (°F)
18K
55F
70F
28547 26521
22022
17523
13688 9852
5623
27412
25000
20766
16532
12605
8678
5423
0
5000
10000
15000
20000
25000
30000
57F 47F 37F 17F 5F -5F -13F
Capacity (BTU)
Outdoor Temoerature (°F)
24K
55F
70F
32152 31254 27790 24325
18391
12456
6852
31025
30000
26274 22547
16401
10254
6012
0
5000
10000
15000
20000
25000
30000
35000
57F 47F 37F 17F 5F -5F -13F
Capacity (BTU)
Outdoor Temoerature (°F)
30K
55F
70F
38542 37521
31577
25632
18564
13245
6852
3721536000
29773
23546
17456
12457
6647
0
5000
10000
15000
20000
25000
30000
35000
40000
45000
57F 47F 37F 17F 5F -5F -13F
Capacity (BTU)
Outdoor Temoerature (°F)
36K
55F
70F

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5. Wiring Diagram
5.1 Indoor Unit
For models: 9H47YIMI, 12H47YIMI, 12H47ZIMI, 18H47ZIMI, 24H46ZIMI
For models: 30H48ZIMI, 36H46ZIMI

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5.2 Outdoor Unit
Model
Voltage (V)
Capacity (BTU)
Type
9H47YOMI
115
9,000
HEAT PUMP
12H47YOMI
115
12,000
HEAT PUMP

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Model
Voltage (V)
Capacity (BTU)
Type
12H47ZOMI
230
12,000
HEAT PUMP

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Model
Voltage (V)
Capacity (BTU)
Type
18H47ZOMI
230
18,000
HEAT PUMP
24H46ZOMI
230
24,000
HEAT PUMP