Service Manual
AIR CONDITIONER
DC INVERTER MULTI TYPE
This manual applies to models:
42QHF009DS
High Wall
42QHF012DS
42QHF018DS
42QSM009DS
Duct
42QSM012DS
42QSM018DS
42QTD009DS
Cassette
42QTD012DS
42QTD018DS
42QFA009DS
Console
42QFA012DS
42QFA018DS
38QUS018DS2
Universal CDU
38QUS027DS3
38QUS036DS4
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CONTENTS
1. General information of Outdoor& Indoor Units .................................. 3
2. Features ................................................................................................. 4
3. Dimensions .......................................................................................... 11
4. Service space for light commercial indoor ....................................... 18
5. Wiring Diagram .................................................................................... 20
6. Refrigeration Cycle Diagram .............................................................. 25
7.Indoor units combination. ................................................................... 27
8. Static Pressure (Duct) ......................................................................... 28
9.Operation Characteristics ................................................................... 29
10.Installation Details.............................................................................. 30
11.Electronic control function ................................................................ 40
12.Troubleshooting ................................................................................. 57
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1. General information of Outdoor& Indoor Units
■Outdoor
Model name
Dimension (mm)
Compressor
38QUS018DS2
845x320x700
DA130M1C-31FZ
38QUS027DS3
900x315x860
DA250S2C-30MT
38QUS036DS4
990x345x965
TNB306FPGMC-L
■Indoor
High wall
A5 Duct
Four-way cassette (compact):
Console:
Model name
Dimension (mm)
42QHF009DS
800x188x275
42QHF012DS
800x188x275
42QHF018DS
940x205x275
42QSM009DS
700x635x210
42QSM012DS
700x635x210
42QSM018DS
920x635x210
42QTD009DS
570x570x260
42QTD012DS
570x570x260
42QTD018DS
570x570x260
42QFA009DS
700x600x210
42QFA012DS
700x600x210
42QFA018DS
700x600x210
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2. Features
2.1 Outdoor unit
2.2 High wall
High wall
Outdoor unit
Power relay control
Filter
Low noise air flow system
Low noise air flow system
Hydrophilic aluminum fin
Refrigerant leakage detect
The hydrophilic fin can improve the heating efficiency at operation mode.
2 ways of drainage
4 way valve control
It is only operated in the heating operation mode except defrosting operation.
Anti-rust cabinet
Anti-rust cabinet
Valve protection cover
Self-diag. Function
It protects the valves and prevents water from dripping.
Louver position memory function
Discharge pipe temperature protection
2.3 Four-way cassette type(compact)
⑴ New panel

360°surrounding air outlet design, affords comfortable feeling
⑵ Compact design
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

The body size is 570×260×570mm, it’s just smaller than the console board, so it’s very easy for
installation and will not damage the decoration. The panel size is 647×50×647mm.
The hooks are designed in the four corners of the body, which can save installation space.
⑶ Electric control box built-in design

The E-box is simply and safely built inside the indoor unit. It’s convenient for installation and
maintenance. Can check the control part easily, you only need to open the air return grille.
⑷ Fresh air intake function:

Fresh air fulfills air quality more healthy and comfortable.
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Fresh
Air
Dimension:Φ75mm
⑸ Air passage function

Reserves the space for air outlet from the side of indoor unit; It’s availed to connect air duct
from the two sides to the nearby small rooms.
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2.4 A5 Duct
⑴ Installation accessories: (Optional)

Front Board, Canvas Air Passage, Filter, Panel, for easy installation
Front Board
Canvas Air Passage
Filter
Panel
⑵ Easy Installation: Two air inlet styles (Bottom side or Rear side)
 Air inlet from rear is standard for all capacity; air inlet from bottom is optional.
 The size of air inlet frame from rear and bottom is same, it’s very easy to move the cover from bottom to
rear side, or from rear to the bottom, in order to matching the installation condition.
Air intake from bottom (Optional)
Air intake from rear (Standard)
⑶ Fresh air intake function
 Install one duct from the reserved fresh-air intake to outdoor.
Continually inhale the fresh air to improve the quality of the indoor air, fulfills air quality more healthy and
comfortable.
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⑷ Easy maintenance
 Clean the filter (Optional, standard product without filter)
It is easy to draw out the filter from the indoor unit for cleaning, even the filter is installed in rear side or
bottom side.

Replace the motor or centrifugal fan
Remove the ventilated panel firstly. Remove a half of blower housing and take out the motor with
centrifugal fan. Directly remove two bolts, and then replace the motor or centrifugal fan easily.
Motor
Blower Housing
Ventilated Panel
⑸ Reserved remote on-off and central control ports
 Reserved remote on-off ports and central control ports, can connect the cable of an on-off controller or a
central controller to realize remote on-off control function or group control function.
Remote on-off ports
Central control ports
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750mm upmost
⑹ Built-in drain pump (Optional):
 Built-in drain pump can lift the water to 750mm upmost. It’s convenient to install drainage piping under
most space condition.
⑺ Built-in display board



The standard indoor unit can be controlled by wired controller.
There is a display board with a receiver in the E-box. Move out the display, and fix it in other place, even
in the distance of 10m. The unit will realized remoter control.
The wired controller and the display board can display the error code or production code when the chips
detect some failure.
Wired Controller (Standard)
Remote Controller (Optional)
Display
2.5 Console
(1) New design, more modern and elegant appearance.
(2) Convenient installation
--The console type can be easily installed into a corner of the console even if the console is very narrow
--It is especially useful when installation of an air conditioner in the center of the console is impossible due to a
structure such as one lighting.
9 / 78
(3) Two direction auto swing (vertical & horizontal) and wide angle air flow,
--Air flow directional control minimizes the air resistance and produces wilder air flow to vertical direction.
--The range of horizontal air discharge is widened which secures wider air flow distribution to provide more
comfortable air circulation no matter where the unit is set up
(4) Three level fan speed, more humanism design, meets different air-supply requirement.
(5) Water proof by utilizing the absorbing plastic film on water collector
(6) Easy operation. Auto-restart function, remote control and optional wire control method.
(7) Low noise level plus compact size
--Shape of the blades has been improved to prevent noise caused by turbulence.
10 / 78
3. Dimensions
3.1 Out door
38QUS018DS2
243.6
200.7
L2
H
6
700
L1
D1 335
560 W1
D2 360
845 W
B1
120
110
B2
D1
58 58 58
H1
110
H2
335
313
D3
W2
73
A2
50
R6
11 / 78
A1
22
R5
38QUS027DS3
L2
H
8
12
860
L1
285.7
238.4
D1 333
590 W1
D2 355
900 W
B1
97
D1
333
90
B2
110
55 55 55 55 55
302
D3
W2
62
H1
A2
50
R6
H2
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H
10
965
38QUS036DS4
D1 366
624 W1
D2 397
990 W
55
B1
145
H1
A2
60
R6
140
366
B2
125
340
D3
H2
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W2
78
A1
22
R5
D1
3.2 High wall
W
H
D
Model
42QHF009DS / 42QHF012DS
42QHF018DS
W
800
940
14 / 78
D
188
205
H
275
275
Four-way cassette (compact):
Gas side
Drain hole
( for Service )
Body
4-install hanger
2- 170
570
523
2- 150 Distribution duct
E-parts box
4-Screw hole
(for install panel)
545
260
570
32 Drain pipe
65 Fresh air intake
156
75
125
Wiring connection port
40
68
Panel
647
Liquid side
44
3.3
647
50
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3.4 A5 Duct
16 / 78
3.5 Console:
600
a. Wall mounting installation
210
700
Hanging arm
195
16 Drain pipe
Dimension
Unit: mm
A
B
C
D
42QFA009DS
700
600
210
195
42QFA012DS
700
600
210
195
42QFA018DS
700
600
210
195
Mode
17 / 78
4. Service space for light commercial indoor
4.1 Four-way cassette (compact) (unit: mm)
4.2 A5 Duct (unit: mm)
Ensure enough space required for installation and maintenance.
All the indoor units reserve the hole to joint the fresh air pipe. The hole size as following:
4.3 Console (unit: mm)
18 / 78
19 / 78
5. Wiring Diagram
Outdoor (38QUS018DS2)
Outdoor (38QUS027DS3)
20 / 78
Outdoor (38QUS036DS4)
High wall (42QHF009DS & 42QHF012DS & 42QHF018DS)
21 / 78
A5 Duct (42QSM009DS)
A5 Duct (42QSM012DS & 42QSM018DS)
22 / 78
Four-way cassette (42QTD009DS)
Four-way cassette (42QTD012DS & 42QTD018DS)
23 / 78
Console
24 / 78
6. Refrigeration Cycle Diagram
6.1 Refrigeration circuit drawing of 38QUS018DS2
INDOOR
OUTDOOR
LIQUID VALVE A
LIQUID VALVE B
EXV A CAPILIARY A
CHECK VALVE
EXV B CAPILIARY B
CAPILIARY TUBE
HEAT
EXCHANGE
(EVAPORATOR)
T4 Ambient
temp. sensor
T1 Room
temp. sensor
T3
Condenser
temp. sensor
HEAT
EXCHANGE
(CONDENSER)
T2B-A Evaporator
T2 Evaporator
temp. sensor
middle
GAS VALVE A
GAS VALVE B
temp. sensor outlet
4-WAY VALVE
T2B-B
Accumulator
T5 Discharge
temp. sensor
Compressor
COOLING
HEATING
6.2 Refrigeration circuit drawing of 38QUS027DS3
INDOOR
OUTDOOR
LIQUID VALVE A
LIQUID VALVE B
LIQUID VALVE C
EXV A CAPILIARY A
EXV B CAPILIARY B
CHECK VALVE
EXV C CAPILIARY C
CAPILIARY TUBE
HEAT
EXCHANGE
(EVAPORATOR)
T2 Evaporator
temp. sensor
middle
T4 Ambient
temp. sensor
T1 Room
temp. sensor
GAS VALVE A
GAS VALVE B
GAS VALVE C
T3
Condenser
temp. sensor
HEAT
EXCHANGE
(CONDENSER)
T2B-A Evaporator
temp. sensor outlet
T2B-B
4-WAY VALVE
T2B-C
Accumulator
T5 Discharge
temp. sensor
Compressor
6.3 Refrigeration circuit drawing of 38QUS036DS4
25 / 78
COOLING
HEATING
INDOOR
OUTDOOR
LIQUID VALVE A
LIQUID VALVE B
EXV A CAPILIARY A
EXV B CAPILIARY B
CHECK VALVE
LIQUID VALVE C
LIQUID VALVE D
HEAT
EXCHANGE
(EVAPORATOR)
EXV D CAPILIARY D
CAPILIARY TUBE
T4 Ambient
temp. sensor
T1 Room
temp. sensor
GAS VALVE A
T2 Evaporator
temp. sensor
middle
EXV C CAPILIARY C
GAS VALVE B
GAS VALVE C
GAS VALVE D
T3
Condenser
temp. sensor
HEAT
EXCHANGE
(CONDENSER)
T2B-A Evaporator
temp. sensor outlet
T2B-B
T2B-C
4-WAY VALVE
Accumulator
High pressure
switch
T2B-D
Low pressure
switch
Compressor
26 / 78
T5 Discharge
temp. sensor
COOLING
HEATING
7.Indoor units combination.
7.1 Indoor unit combination for 38QUS018DS2
One unit
Two unit
/
9+9
9
9+12
12
12+12
18
18+09*
/
18+12*
[*] means two indoor unit shall not operate simultaneously due to performance reduction.
7.2 Indoor unit combination for 38QUS027DS3
One unit
Two unit
Three unit
9
9+9
12+18
9+9+9
9+12+12
12
9+12
12+18
9+9+12
12+12+12
18
9+18
18+18
9+9+18
/
7.3 Indoor unit combination for 38QUS036DS4
One unit
Two unit
Three unit
Four unit
9
9+9
12+12
9+9+9
9+12+12
12+12+12
9+9+9+9
9+9+12+12
9+12+12+18
12
9+12
12+18
9+9+12
9+12+18
12+12+18
9+9+9+12
9+9+12+18
12+12+12+12
18
9+18
18+18
9+9+18
9+18+18
12+18+18
9+9+9+18
9+12+12+12
/
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8. Static Pressure (Duct)
7,000-12,000Btu/h
800
700
500
400
300
200
100
0
0
5
10
15
20
25
External static pressure (Pa)
30
18,000Btu/h
Pa
90
80
External static pressure (Pa)
Air flow rate (m3/h)
600
Super high speed
70
60
High speed
50
40
Mid speed
30
Low speed
20
10
200 300
400 500 600 700 800 900 1000 1100 1200
Air volume(m 3 /h)
28 / 78
35
40
9.Operation Characteristics
Mode
Temperature
Cooling operation
Heating operation
17℃~32℃
0℃~30℃
Room temperature
0℃~50℃
Outdoor temperature
CAUTION:
(-15℃~50℃:For the
models with low
temperature cooling
system)
-15℃~24℃
1. If the air conditioner is used beyond the above conditions, certain safety protection features may come into
operation and cause the unit to operate abnormally.
2. The room relative humidity should be less than 80%. If the air conditioner operates beyond this figure, the surface
of the air conditioner may attract condensation. Please set the vertical air flow louver to its maximum angle
(vertically to the floor), and set HIGH fan mode.
3. The optimum performance will be achieved during this operating temperature zone.
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10.Installation Details
10.1 Wrench torque sheet for installation
Outside diameter
Torque
Additional tightening torque
mm
N.cm
N.cm
Ф6.35
1500(153kgf.cm)
1600(163kgf.cm)
Ф9.52
2500(255kgf.cm)
2600(265kgf.cm)
Ф12.7
3500(357kgf.cm)
3600(367kgf.cm)
10.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Rated current of appliance
Nominal cross-sectional area (mm²)
>3 and ≤6
0.75
>6 and ≤10
1
>10 and ≤16
1.5
>16 and ≤25
2.5
The cable size and the current of the fuse or switch are determined by the maximum current indicated on the
nameplate which located on the side panel of the unit. Please refer to the nameplate before selecting the
cable, fuse and switch.
10.3 Pipe length and the elevation
Maximum piping length and height difference
1 drive 2
1 drive 3
1 drive 4
Max. length for all rooms (m)
30
45
60
Max. length for one IU (m)
20
25
30
OU higher than IU
10
10
10
OU lower than IU
15
15
15
Max. height difference between IUs (m)
10
10
10
Charge less length(m)
10
15
20
Max. height difference
between IU and OU (m)
Additional refrigerant charge(R410A) = ( Max. length for all rooms- Charge less length)*15 g/m
Note: When the pipe length is longer than charge less legth, the additional refrigerant should be added
according to the pipe length.
Caution:
● Refrigerant pipe diameter is different according to indoor unit to be connected. When using the extension
pipe, refer to the tables below.
● When refrigerant pipe diameter is different from that of outdoor unit union (for 18K indoor unit), additional
transfer connector needs to be used on outdoor unit union.
30 / 78
Indoor unit
Model
9K/12K
18K
Pipe diameter (mm/inch)
Extension pipe diameter (mm/inch)
Liquid
6.35(1/4)
Liquid
6.35(1/4)
Gas
9.52(3/8)
Gas
9.52(3/8)
Liquid
6.35(1/4)
Liquid
6.35(1/4)
Gas
12.7(1/2)
Gas
12.7(1/2)
Liquid
6.35(1/4)
Gas
9.52(3/8)
Outdoor unit union diameter (mm/inch)
Indoor unit A/B/C/D
10.4 Installation for the first time
Air and moisture in the refrigerant system have undesirable effects as below:
● Pressure in the system rises.
● Operating current rises.
● Cooling or heating efficiency drops.
● Moisture in the refrigerant circuit may freeze and block capillary tubing.
● Water may lead to corrosion of parts in the refrigerant system.
Therefore, the indoor units and the pipes between indoor and outdoor units must be leak tested and
evacuated to remove gas and moisture from the system.
Gas leak check (Soap water method):
Apply soap water or a liquid neutral detergent on the indoor unit connections or outdoor unit
connections by a soft brush to check for leakage of the connecting points of the piping. If bubbles come out,
the pipes have leakage.
1. Air purging with vacuum pump
31 / 78
(Indoor unit)
(Outdoor unit)
(Liquid side)
Two-way valve
Close
(Gas side)
Three-way valve
Close
Manifold valve
Compound meter
Pressure
gauge
-0.1MPa
Lo
Handle Lo
Charge hose
Hi
Handle Hi
Charge hose
Vacuum
pump
Vacuum
pump
1) Completely tighten the flare nuts of the indoor and outdoor units, confirm that both the 2-way and 3-way
valves are set to the closed position.
2) Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port..
3) Connect the charge hose of handle hi connection to the vacuum pump.
4) Fully open the handle Lo of the manifold valve.
5) Operate the vacuum pump to evacuate.
6) Make evacuation for 30 minutes and check whether the compound meter indicates -0.1Mpa. If
the meter does not indicate -0.1Mpa after pumping 30 minutes, it should be pumped 20 minutes more. If the
pressure can’t achieve -0.1Mpa after pumping 50 minutes, please check if there are some leakage points.
Fully close the handle Lo valve of the manifold valve and stop the operation of the vacuum pump. Confirm
that the gauge needle does not move (approximately 5 minutes after turning off the vacuum pump).
7) Turn the flare nut of the 3-way valves about 45° counterclockwise for 6 or 7seconds after the gas
coming out, then tighten the flare nut again. Make sure the pressure display in the pressure indicator is a
little higher than the atmosphere pressure. Then remove the charge hose from the 3 way valve.
8) Fully open the 2 way valve and 3 way valve and securely tighten the cap of the 3 way valve.
32 / 78
2. Air purging by refrigerant
Procedure:
1). Confirm that both the 2-way and 3-way valves are set to the closed position.
2). Connect the charge set and a charging cylinder to the service port of the 3-way valve.
3). Air purging.
Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on the
2-way valve approximately 45’ for 3 seconds then closing it for 1 minute; repeat 3 times.
After purging the air, use a torque wrench to tighten the flare nut on the 2-way valve.
4). Check the gas leakage.
Check the flare connections for gas leakage.
5). Discharge the refrigerant.
Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the
2-way valve approximately 45’ until the gauge indicates 0.3 to 0.5 M Pa.
6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open
position.
Be sure to use a hexagonal wrench to operate the valve stems.
7). Mount the valve stems nuts and the service port cap.
8) Be sure to check the gas leakage.
Brush some bubble water at connections which have been connected during installation especially for the
valve connections
Note:
Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m.
33 / 78
3. Adding the refrigerant if the pipe length >5m
Electronic scale
Procedure:
1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve.
Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the
cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure the liquid charge.
2). Purge the air from the charge hose.
Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be
careful of the liquid refrigerant).
3) Put the charging cylinder onto the electronic scale and record the weight.
4) Operate the air conditioner at the cooling mode.
5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.
6).When the electronic scale displays the proper weight (refer to the table), disconnect the charge hose from
the 3-way valve’s service port immediately and turn off the air conditioner before disconnecting the hose.
7). Mount the valve stem caps and the service port
8) Be sure to check the gas leakage.
Brush some bubble water at connections which have been connected during installation especially for the
valve connections
Note:
Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m..
10.5 Adding the refrigerant after running the system for many years
34 / 78
Electronic scale
Procedure:
1). Connect the charge hose to the 3-way service port, open the 2-way valve and the 3-way valve.
Connect the charge hose to the valve at the bottom of the cylinder. If the refrigerant is R410A, make the
cylinder bottom up to ensure liquid charge.
2). Purge the air from the charge hose.
Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be
careful of the liquid refrigerant).
3) Put the charging cylinder onto the electronic scale and record the weight.
4) Operate the air conditioner at the cooling mode.
5) Open the valves (Low side) on the charge set and charge the system with liquid refrigerant.
6).When the electronic scale displays the proper weight (refer to the gauge and the pressure of the low side),
disconnect the charge hose from the 3-way valve’s service port immediately and turn off the air conditioner
before disconnecting the hose.
7). Mount the valve stem caps and the service port
8) Be sure to check the gas leakage.
Brush some bubble water at connections which have been connected during installation especially for the
valve connections
Note:
Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m.
.
35 / 78
10.6 Re-installation while the indoor unit needs to be repaired
1. Collecting the refrigerant into the outdoor unit
Procedure
1). Confirm that both the 2-way and 3-way valves are set to the opened position
Remove the valve stem caps and confirm that the valve stems are in the opened position.
Be sure to use a hexagonal wrench to operate the valve stems.
2). Connect the charge hose with the push pin of handle lo to the 3-way valves gas service port.
3). Air purging of the charge hose.
Open the handle Lo valve of the manifold valve slightly to purge air from the charge hose for 5 seconds and
then close it quickly.
4). Set the 2-way valve to the close position.
5). Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.
6). Set the 3-way valve to the closed position immediately
Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa.
Disconnect the charge set, and tighten the 2-way and 3-way valve’s stem nuts.
7) Be sure to check the gas leakage.
Brush some bubble water at connections which have been connected during installation especially for the
valve connections
Note:
Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m.
36 / 78
2. Air purging by the refrigerant
Procedure:
1). Confirm that both the 2-way and 3-way valves are set to the closed position.
2). Connect the charge set and a charging cylinder to the service port of the 3-way valve
Leave the valve on the charging cylinder closed.
3). Air purging.
Open the valves on the charging cylinder and the charge set. Purge the air by loosening the flare nut on the
2-way valve approximately 45’ for 3 seconds then closing it for 1 minute; repeat 3 times.
After purging the air, use a torque wrench to tighten the flare nut on the 2-way valve.
4). Check the gas leakage
Check the flare connections for gas leakage.
5). Discharge the refrigerant.
Close the valve on the charging cylinder and discharge the refrigerant by loosening the flare nut on the
2-way valve approximately 45’ until the gauge indicates 0.3 to 0.5 MPa.
6). Disconnect the charge set and the charging cylinder, and set the 2-way and 3-way valves to the open
position
Be sure to use a hexagonal wrench to operate the valve stems.
7). Mount the valve stems nuts and the service port cap
8) Be sure to check the gas leakage.
Brush some bubble water at connections which have been connected during installation especially for the
valve connections
Note:
Be sure to use a torque wrench to tighten the service port cap to a torque 18N.m.
37 / 78
10.7 Re-installation while the outdoor unit needs to be repaired
1. Evacuation for the whole system
Procedure:
1). Confirm that both the 2-way and 3-way valves are set to the opened position.
2). Connect the vacuum pump to 3-way valve’s service port.
3). Evacuation for approximately one hour. Confirm that the compound meter indicates -0.1Mpa.
4). Close the valve (Low side) on the charge set, turn off the vacuum pump, and confirm that the gauge
needle does not move (approximately 5 minutes after turning off the vacuum pump).
5). Disconnect the charge hose from the vacuum pump.
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2. Refrigerant charging
Procedure:
1). Connect the charge hose to the charging cylinder, open the 2-way valve and the 3-way valve
Connect the charge hose which you disconnected from the vacuum pump to the valve at the bottom of the
cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure liquid charge.
2). Purge the air from the charge hose
Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be
careful of the liquid refrigerant).
3) Put the charging cylinder onto the electronic scale and record the weight.
4). Open the valves (Low side) on the charge set and charge the system with liquid refrigerant
If the system cannot be charge with the specified amount of refrigerant, or can be charged with a little at a
time (approximately 150g each time) , operating the air conditioner in the cooling cycle; however, one time is
not sufficient, wait approximately 1 minute and then repeat the procedure.
5).When the electronic scale displays the proper weight, disconnect the charge hose from the 3-way valve’s
service port immediately
If the system has been charged with liquid refrigerant while operating the air conditioner, turn off the air
conditioner before disconnecting the hose.
6). Mounted the valve stem caps and the service port
Use torque wrench to tighten the service port cap to a torque of 18N.m.
7) Be sure to check for gas leakage
Brush some bubble water at connections which have been connected during installation especially for the
valve connections
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11.Electronic control function
11.1 Abbreviation
T1: Indoor ambient temperature
T2: Coil temperature of indoor heat exchanger middle.
T2B: Coil temperature of indoor heat exchanger outlet.
T3: Coil temperature of outdoor heat exchanger
T4: Outdoor ambient temperature
T5: Compressor discharge temperature
T s: Setting temperature
11.2 Electric control working environment.
9.2.1 Input voltage: 198V~264V.
9.2.2 Input power frequency: 50Hz.
9.2.3 Indoor fan normal working amp. is less than 1A.
9.2.4 Outdoor fan. normal working amp. is less than 1.5A.
9.2.5 Four-way valve normal working amp. is less than 1A.
11.3 Outdoor unit’s digital display tube
There is a digital display tube in outdoor PCB.
Digital display tube display function

In standby , the LED displays “- -”

In compressor operation, the LED display the running frequency,

In defrosting mode, The LED displays “dF” or alternative displays between running frequency and
“dF”(each displays 0.5s)

In compressor pre-heating, The LED displays “PH” or alternative displays between running frequency
and “PH”(each displays 0.5s)

During the oil return process, The LED displays “RO” or alternative displays between running
frequency and “RO”(each displays 0.5s)

In low ambient cooling mode, the LED displays “LC” or alternative displays between running frequency
and “LC”(each displays 0.5s)

In forced cooling mode, the LED displays “FC” or alternative displays between running frequency
and “FC”(each displays 0.5s)

When PFC module protection occurs three times within 15 minutes, the LED displays “E6” or
alternative displays between running frequency and “E6”(each displays 0.5s)

In protection or malfunction, the LED displays error code or protection code.
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11.4 Outdoor unit point check function
There is a check switch in outdoor PCB.
Press the switch N times it will display the content corresponding to No. N. After getting into the check function, it
will display No. N with 1.5s, meanwhile the low bit decimal of digit display flashing, indicated to get into the check
function display. After 1.5s, it will display the content corresponding to No. N.
the digital display tube will display the follow procedure when push SW1 each time.
Display
Remark
0
Normal display
Display running frequency, running state or malfunction code
1
No. of indoor units in good connection
Actual data
2
Outdoor unit running mode code
Off:0,Fan only 1, Cooling:2, Heating:3, Forced cooling:4
3
A indoor unit capacity
4
B indoor unit capacity
5
C indoor unit capacity
6
D indoor unit capacity
7
E indoor unit capacity
8
A Indoor unit capacity demand code
9
B Indoor unit capacity demand code
10
C Indoor unit capacity demand code
11
D Indoor unit capacity demand code
12
17
E Indoor unit capacity demand code
Total indoor units amendatory capacity
demand code
The frequency corresponding to the total
indoor units amendatory capacity demand
The frequency after the frequency limit
The frequency sending to compressor
control chip
A indoor unit evaporator outlet temp.(T2BA)
18
B indoor unit evaporator outlet temp.(T2BB)
19
C indoor unit evaporator outlet temp.(T2BC)
20
D indoor unit evaporator outlet temp.(T2BD)
21
E indoor unit evaporator outlet temp.(T2BE)
22
A indoor unit room temp.(T1A)
23
B indoor unit room temp.(T1B)
24
C indoor unit room temp.(T1C)
25
D indoor unit room temp.(T1D)
26
E indoor unit room temp.(T1E)
27
A indoor unit evaporator temp.(T2A)
28
B indoor unit evaporator temp.(T2B)
29
C indoor unit evaporator temp.(T2C)
30
D indoor unit evaporator temp.(T2D)
31
E indoor unit evaporator temp.(T2E)
32
Condenser pipe temp.(T3)
33
Outdoor ambient temp.(T4)
13
14
15
16
34
Compressor discharge temp.(T5)
35
AD value of current
36
AD value of voltage
The capacity unit is horse power. If the indoor unit is not connected,
the digital display tube will show: “――”
(7K:0.8HP, 9K:1HP,12K:1.2HP,18K:1.5HP)
Norm value*HP
(7K:0.8HP, 9K:1HP,12K:1.2HP,18K:1.5HP)
Forced cooling:7
If the temp. is lower than -9 degree, the digital display tube will show
“-9”.If the temp. is higher than 70 degree, the digital display tube will
show “70”. If the indoor unit is not connected, the digital display tube
will show: “――”
If the temp. is lower than 0 degree, the digital display tube will show
“0”.If the temp. is higher than 50 degree, the digital display tube will
show “50”. If the indoor unit is not connected, the digital display tube
will show: “――”
If the temp. is lower than -9 degree, the digital display tube will show
“-9”.If the temp. is higher than 70 degree, the digital display tube will
show “70”. If the indoor unit is not connected, the digital display tube
will show: “――”
The display value is between 30~129 degree. If the temp. is lower
than 30 degree, the digital display tube will show “30”.If the temp. is
higher than 99 degree, the digital display tube will show single digit
and tens digit. For example, the digital display tube show “0.5”,it
means the compressor discharge temp. is 105 degree.)
The display value is hex number.
For example, the digital display tube shows “Cd”, it means AD value
is 205.
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37
EXV open angle for A indoor unit
38
EXV open angle for B indoor unit
39
EXV open angle for C indoor unit
40
EXV open angle for D indoor unit
41
EXV open angle for E indoor unit
42
Actual data/4.
If the value is higher than 99, the digital display tube will show single
digit and tens digit.
For example, the digital display tube show “2.0”, it means the EXV
open angle is 120×4=480p.)
Frequency limit symbol
43
Average value of T2
44
Outdoor unit fan motor state
45
The last error or protection code
Bit7
Frequency limit caused by IGBT
radiator
Bit6
Frequency limit caused by PFC
Bit5
Frequency limit caused by T4.
Bit4
Frequency limit caused by T2.
Bit3
Frequency limit caused by T3.
Bit2
Frequency limit caused by T5.
Bit1
Frequency limit caused by current
The display value
is hex number. For
example,
the
digital display tube
show
2A,then
Bit5=1,
Bit3=1,
Bit1=1.
It
means
frequency
limit
caused by T4,T3
and current.
Bit0
Frequency limit caused by voltage
(Sum T2 value of all indoor units)/( number of indoor units in good
connection)
Off:0, High speed:1, Med speed:2, Low speed:3 Breeze:4, Super
breeze:5
00 means no malfunction and protection
The following items from 11.4.1 to 11.4.5 are for the explanation of the point check functions.
11.4.1 Frequency of compressor:
Display
Frequency of compressor (Hz)
30
30
--
Stand by
60
60
Display
Corresponding mode
0
Off
1
Fan only
2
Cooling mode
3
Heating mode
4
Forced cooling
11.4.2 Running mode:
11.4.3 Capacity demand:
Cooling mode
T1 Ts
a
3
2
1
0
1
b
c
d
4
3
2
1
e
0
f
Capacity area
a
b
c
d
e
f
Norm value (N)
3
2
1.5
1
0.5
0
Heating mode
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T1 Ts
4
3
2
1
0
f
e
d
c
b
a
3
2
1
0
-1
Capacity area
a
b
c
d
e
f
Norm value (N)
3
2
1.5
1
0.5
0
11.4.4 Number of indoor unit
Display
Number of indoor unit
1
1
2
2
3
3
4
4
11.4.5 Opening degree of electronic expansion valve:
Actual opening degree equals the display data times 4
11.5 Icon explanation on indoor display board
11.5.1 High wall
1
DEFROST indication lamp(For cooling & heating
models only): Lights up when the air conditioner starts
defrosting automatically or when the warm air control
feature is activated in heating operation.
OPERATION indication lamp:This lamp illuminates
when the air conditioner is in operation.
2
TIMER indication lamp:Lights up during Timer
operation.
3
4
Temperature indicator:Displays the temperature
settings when the air conditioner is operational. Displays the
malfunction code.
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11.5.2
11.5.3
Four-way cassette (compact)
A5 Duct
PRE-DEF indicator(cooling and heating type)
or fan only indicator(cooling only type)
Timer indicator
Alarm indicator
Operation lamp
Infrared signal receiver
Display digital tube
Temporary button
MANUAL OPERATION TIMER DEF./FAN ALARM
11.5.4 Console
11.6 Main Protection
11.6.1 Three minutes delay at restart for compressor.
11.6.2 Temperature protection of compressor discharge.
When the compressor discharge temp. is getting higher, the running frequency will be limited as below rules:
----If 102℃<T5<115℃, decrease the frequency to the lower level every 2 minutes till to F1.
---If T5>115℃ for 10 seconds, the compressor will stop and restart till T5<90℃.
11.6.3 Low voltage protection
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VOLTAGE
No limit
VOLT_RST1_ADD
VOLT_LTM1_ADD
VOLT_LTM_FREQ1_ADD
VOLT_RST2_ADD
VOLT_LTM2_ADD
VOLT_LTM_FREQ2_ADD
Note: if the low voltage protection occurs and not resumes within 3min, it will keep the protection always
after restart the machine.
11.6.4 Compressor current limit protection
If the compressor current exceeds the current limit value for 10 seconds, the compressor frequency will be
limited as below table.
Cooling mode:
Frequency limit
Current frequency(Hz) Current limit value(A)
COOL_F16
ICOOLLMT12
COOL_F15
ICOOLLMT11
COOL_F14
ICOOLLMT10
COOL_F13
ICOOLLMT9
COOL_F12
ICOOLLMT8
COOL_F11
ICOOLLMT7
COOL_F10
ICOOLLMT6
COOL_F9
ICOOLLMT5
COOL_F8
ICOOLLMT4
COOL_F7
ICOOLLMT3
COOL_F6
ICOOLLMT2
COOL_F5
ICOOLLMT1
Decrease the frequency to COOL_F4 and run at COOL_F4 for
3 minutes.
After that, the frequency will be adjusted according to the
capacity demand and rise to the upper level every 3 minutes
(When the frequency>COOL_F4 via capacity demand).
If the current frequency is lower than COOL_F4, the frequency will not be limited.
After 10s of the compressor start, if the current>ICOOL, the AC will display the failure for 30 seconds and stop. The AC
will restart 3 minutes later.
Heating mode:
Frequency limit
Current frequency(Hz) Current limit value(A)
HEAT_F16
IHEATLMT12
HEAT_F15
IHEATLMT11
HEAT_F14
IHEATLMT10
HEAT_F13
IHEATLMT9
HEAT_F12
IHEATLMT8
HEAT_F11
IHEATLMT7
Decrease the frequency to HEAT_F4 and run at HEAT_F4 for
3 minutes.
After that, the frequency will be adjusted according to the
capacity demand and rise to the upper level every 3 minutes
(When the frequency>Heat_F4 via capacity demand).
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HEAT_F10
IHEATLMT6
HEAT_F9
IHEATLMT5
HEAT_F8
IHEATLMT4
HEAT_F7
IHEATLMT3
HEAT_F6
IHEATLMT2
HEAT_F5
IHEATLMT1
If the current frequency is lower than HEAT_F4, the frequency will not be limited.
After 10s of the compressor start, if the current>IHEAT, the AC will display the failure for 30 seconds and stop. The AC
will restart 3 minutes later.
11.6.5 Indoor / outdoor units communication protection
If the indoor units can not receive the feedback signal from the outdoor units for 2 minutes, the AC will stop
and display the failure.
11.6.6 High condenser coil temp. protection.
When T3>65℃ for 3 seconds, the compressor will stop while the indoor fan and outdoor fan will continue.
When T3<52℃, the protection will release and the compressor will restart after 3 minutes.
11.6.7 Outdoor unit anti-freezing protection
For other models: When T2B<0℃ for 250 seconds, the indoor unit capacity demand will be zero and
resume to normal when T2B>10℃.
For M2OD-16HFN1-Q,M2OD-18HFN1-Q,M50D-42HFN1-Q: When T2<4℃ for 250 seconds or T2<0℃, the
indoor unit capacity demand will be zero and resume to normal when T2>8℃ and the time of protection is
no less than 3 minutes.
11.6.8 Oil return
Running rules:
1. If the compressor frequency keeps lower than RET_OIL_FREQ1_ADD for RET_OIL_TIME1_ADD, the
AC will rise the frequency to RET_OIL_FREQ2_ADD for RET_OIL_TIME2_ADD and then resume to
former frequency.
2. The EXV will keep 300p while the indoor units will keep the current running mode.
If the outdoor ambient is higher than TempT4HeatLimit_ADD during the oil return, the AC quit oil return.
11.6.9 Inverter module protection
The Inverter module has a protection function about current, voltage and temperature. If these protections
happen, the corresponding code will display on indoor unit and the unit will stop working.
11.6.10 Indoor fan delayed open function
When the unit starts up, the louver will be active immediately and the indoor fan will open 10s later.
If the unit runs in heating mode, the indoor fan will be also controlled by anti-cold wind function.
11.7 Operation Modes and Functions
11.7.1 Fan-only mode
(1) Outdoor fan and compressor stop.
(2) Indoor fan can be set to high/med/low/auto.
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(3) The louver operates same as in cooling mode.
(4) Auto fan in fan-only mode acts as follow:
For Console, A5 Duct:
T1
27.5
High
27
Medium
25.5
25
Low
When T1-24≤27℃, transfer high to medium speed,
When T1≤25℃, transfer medium speed to low.
When T1>25.5℃, transfer low to medium speed,
When T1>27.5℃, transfer medium speed to high.
For the other types:
When T1-TA≤3℃, transfer high to medium speed,
When T1-TA≤1℃, transfer medium speed to low.
When T1-TA >1℃, transfer low to medium speed,
When T1-TA >4℃, transfer medium speed to high.
For Four-way cassette (compact):TA=23
For A2 four-way cassette (compact)&A5 Duct:TA=24
(5) PTC function and sleep mode are invalid
11.7.2 Cooling mode
11.7.2.1 Compressor running rules
The compressor will run at corresponding frequency according to the gross amendatory capacity demand.
Frequency
COOL_F0
COOL_F1
47 / 78
COOL_F2
……
COOL_F15
COOL_F16
Amendatory capacity demand.
0
1
2
……
15
Meanwhile the maximum running frequency will be adjusted according to the outdoor ambient temp.
T4LimFre5_ADD
49
48
46
T4LimFre4_ADD
45
43
T4LimFre3_ADD
42
41
T4LimFre2_ADD
39
38
T4LimFre1_ADD
37
No limit
48 / 78
16
11.7.2.2 Outdoor fan running rules
Cooling
Heating
21
A
28
A
19
18
B
26
25
16
15
C
23
22
C
13
12
20
19
D
D
17
E
10
B
E
While A,B,C…means different fan speed of outdoor unit.
11.7.2.3 Indoor fan running rules
(1) Indoor fan keeps running, fan speed can be set in high/mid/low/ Auto by using a remote controller:
(2) Auto fan in cooling mode acts as follow:
For Console& A3 four-way cassette (compact):
T1-Ts
3.5
3
High
Medium
1.5
1
Low
For A5 duct:
T1-Ts
4
3
High
Medium
1.5
1
Low
For the other types:
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4
High
3
Medium
1
Low
(3) Anti-freezing control to indoor evaporator in cooling mode
Evaporator Temp.
Compressor
T2≤ 4℃
Off
Console,
A5 duct
T2> 8℃
On
A3 four-way
cassette
(compact)
T2B<0℃ for 250s
Off
T2B> 10℃
T2≤ 3℃
T2> 7℃
On
Off(After 3 minutes)
On
The other
types
(4) PTC function is invalid and sleep mode can be set by using a remote controller.
11.7.2.4 Evaporator low temperature T2 protection
When T2<4℃, the indoor has no capacity demand and resume till T2>8℃
11.7.3 Dry mode
11.7.3.1 Indoor fan speed is fixed at breeze and can’t be changed. The louver angle is the same as in
cooling mode.
11.7.3.2 Low indoor room temperature protection
In drying mode, if room temperature is lower than 10℃, the indoor fan will stop and not resume until room
temperature exceeds 12℃.
11.7.3.3 Evaporator anti-freezing protection and condenser high temperature protection are active and the
same as that in cooling mode.
11.7.3.4 The outdoor fan operates the same as in cooling mode.
11.7.4 Heating mode
11.7.4.1 Compressor running rules
The compressor will run at corresponding frequency according to the gross amendatory capacity demand.
Frequency
0
HEAT_F1
HEAT _F2
……
HEAT_F15
HEAT _F16
Amendatory capacity demand.
0
1
2
……
15
16
11.7.4.2 Outdoor fan running rules
50 / 78
Heating
21
E
19
18
D
16
15
C
13
12
B
10
A
11.7.4.3 Indoor fan running rules
(1) Indoor Fan actions in heating mode
Indoor Fan can be set at HIGH/MID/LOW/AUTO by using a remote controller, but Anti-cold wind function prevails.
Anti-cold wind control function in heating mode:
(2) Auto wind in heating mode
For Console:
T1-Ts-ΔT
Low
2.5
2
1.5
Medium
1
High
For A5 duct:
T1-Ts+(6-ΔT)
Low
2.5
2
1.5
Medium
1
High
For the other types
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T1-Ts
Low
3
2
Medium
1
High
(3) Indoor evaporator high-temperature protection in heating mode
For A5 duct, A3 four-way cassette (compact)::
T2>63℃, the compressor will stop and restart when T2<48℃.
For the other types
T2>60℃, the compressor will stop and restart when T2<48℃.
11.7.4.4 High evaporator coil temp.T2 protection:
If T2>63℃, the indoor unit has no capacity demand and resume till 48℃.
11.7.4.5 Prevent Over-Heating(except for old four-way cassette (compact))
For console, A5 Duct and A3 four-way cassette (compact): In heating mode, when the indoor unit has no capacity
requirement due to indoor room temperature increased, the Indoor fan will run in breeze. (Anti-cold wind function
has the priority)
For A2 four-way cassette (compact): In heating mode, when the indoor unit has no capacity requirement due to
indoor room temperature increased, if outdoor fan and compressor stop, the Indoor fan will run in setting fan speed,
otherwise, the Indoor fan will run in low. (Anti-cold wind function has the priority)
11.7.4.6 Defrosting mode:
Condition of defrosting:
If any one of the following items is satisfied, AC will enter the defrosting mode.
After the compressor starts up and keeps running, mark the minimum value of T3 from the 10th minutes to
15th minutes as T30.
1)If the compressor cumulate running time is up to 29 minutes and T3< TCDI1, T3+T30SUBT3ONE≦T30.
2)If the compressor cumulate running time is up to 35 minutes and T3< TCDI2, T3+T30SUBT3TWO≦T30.
3)If the compressor cumulate running time is up to 29 minutes and T3< TCDI3 for 3 minutes.
4)If the compressor cumulate running time is up to 120 minutes and T3<-15℃.
Condition of ending defrosting:
If any one of the following items is satisfied, the defrosting will finish and the machine will turn to normal
heating mode.
----T3 rises to be higher than TCDE1℃.
----T3 keeps to be higher than TCDE2℃ for 80 seconds.
----The machine has run for 10 minutes in defrosting mode.
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Defrosting action:
4-Way valve
no longer than 10min
Compressor
Indoor fan
Cool-F9
TimeA 10S
10S 30S
Anti cold wind
Outdoor fan
PMV running
4 mins with 480P
PMV
480P
11.7.5 Auto-mode
This mode can be chosen by remote controller and the setting temperature can be changed between
18~30℃.
In auto mode, the machine will choose cooling, heating or fan-only mode according to the difference
between T1 and TS.
T1-TS
Running mode
T1-TS>1℃
Cooling
-1< T1-TS≤1℃
Fan-only
Heating
T1-TS≤-1℃
Indoor fan will run at auto fan of the relevant mode.
The louver operates same as in relevant mode.
If the machine switches mode between heating and cooling, the compressor will keep stopping for 15
minutes and then choose mode according to T1-Ts.
If the setting temperature is modified, the machine will choose running function again.
11.7.6 Forced operation function
11.7.6.1 Enter forced operation function:
Pressing the touch button once, the machine will transfer into forced auto mode, if pressing the button once again,
the machine will turn into forced cooling mode, the third pressing will stop the unit, and the forth pressing is the
start of the cycle of forced auto mode, forced cooling mode and stop. Refer the following chart:
11.7.6.2 In forced operation mode, all general protections and remote control are valid.
11.7.6.3 Operation rules:
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Forced cooling mode:
The indoor fan will work in low speed (For console, the indoor fan will work in breeze speed), compressor and
outdoor fan open unconditionally, after 30mins, the unit will transfer into forced auto mode. All the protections are
valid during forced cooling mode
When there’s one indoor unit running in forced cooling, it is the master forced cooling unit. Other indoor units will
run at forced cooling mode too and they will be the slave forced cooling units. The slave forced cooling units can not
quit forced cooling mode until the master forced cooling unit quit.
The slave forced cooling units will not be controlled by other signals.
Forced auto mode:
The action of forced auto mode is the same as normal auto mode with 24℃ setting temperature.
All the protections are valid during forced auto mode
11.7.7 Timer Function
11.7.7.1 Timing range is 24 hours.
11.7.7.2 Timer on. The machine will turn on automatically when reaching the setting time.
11.7.7.3 Timer off. The machine will turn off automatically when reaching the setting time.
11.7.7.4 Timer on/off. The machine will turn on automatically when reaching the setting “on” time, and then
turn off automatically when reaching the setting “off” time.
11.7.7.5 Timer off/on. The machine will turn off automatically when reaching the setting “off” time, and then
turn on automatically when reaching the setting “on” time.
11.7.7.6 The timer function will not change the AC current operation mode. Suppose AC is off now, it will not
start up firstly after setting the “timer off” function. And when reaching the setting time, the timer LED will be
off and the AC running mode has not been changed.
11.7.7.7 The setting time is relative time.
11.78 Sleep mode
11.7.8.1 The sleep function is available in cooling, heating or auto mode.
11.7.8.2. Operation process in sleep mode is as follow.
After pressing ECONOMIC or SLEEP button on controller, the machine will turn into sleep mode.
When cooling, The set temperature rise 1℃ per hour(be lower than 30℃). Two hours later, the set
temperature will maintain as a constant and the fan speed is kept at low speed.
When heating, The set temperature decrease 1℃ per hour(be higher than 17℃). Two hours later, the set
temperature will maintain as a constant and the fan speed is kept at low speed (Anti-cold function takes
precedence over all).
54 / 78
When auto, After an hour running under economic mode ,if it is under cooling mode the set temp will rise 1℃,
if it is under heating mode the set temp will decrease 1℃, if it is under fan-only mode the set temp will be
changeless; the condition will be the same after the air conditioner running under economic mode after 2
hours, and during the next time the set temp do not change.
11.7.8.3 Operation time in sleep mode is 7 hours. After 7 hours the AC quits this mode and the AC will turn
off.
11.7.8.4 Timer off and remote controller off signals have the priority compared with sleep function.
11.7.9 Auto-Restart function
The indoor unit is equipped with auto-restart function, which is carried out through an auto-restart module. In
case of a sudden power failure, the module memorizes the setting conditions before the power failure. The
unit will resume the previous operation setting (not including swing function) automatically after 3 minutes
when power returns.
If the memorization condition is forced cooling mode, the unit will run in cooling mode for 30 minutes and
turn to auto mode as 24℃ setting temp.
If AC is off before power off and AC is required to start up now, the compressor will have 1 minute delay
when power on. Other conditions, the compressor will have 3 minutes delay when restarts.
11.7.10 Drain pump control (For Duct & Cassette)
Adopt the water-level switch to control the action of drain pump.
Main action under different condition :( every 5 seconds the system will check the water level one time)
1. When the A/C operates with cooling (including auto cooling) and forced cooling mode or dry mode, the
pump will start running immediately and continuously, till stop cooling or dry or no capacity demand.
2. Once the water level increase and up to the control point, LED will alarm and the drain pump open and
continue checking the water level. If the water level falls down below the control point (drain pump delay
close 1 minute) and operate with the last mode. Otherwise the entire system stop operating (including the
pump) and LED remain alarming after 3 minutes,
11.7.11 Mode conflict
The indoor units can’t work cooling mode and heating at same time.
Heating mode has a priority.
(1) Definition
Cooling mode
Heating Mode
Fan
Off
Cooling mode
No
Yes
No
No
Heating Mode
Yes
No
Yes
No
Fan
No
Yes
No
No
Off
No
No
No
No
No: No mode conflict;
55 / 78
Yes: Mode conflict
(2) Unit action

In case of one Indoor unit working in cooling mode or fan mode, and another indoor unit is set to
heating mode, the indoor unit working in cooling mode or fan mode will change to off. The outdoor unit
will change to heating mode after compressor stop 3 minutes. .

In case of one Indoor unit working in heating mode, and another indoor unit is set to cooling mode or
fan mode, the indoor unit setting to cooling mode or fan mode will change to stand by. The outdoor unit
will continue working in heating mode.
If heating mode stops (not including the indoor unit in heating mode reaching the set temperature), 3
minutes after the outdoor unit restarts and works in cooling mo
56 / 78
12.Troubleshooting
12.1 Indoor unit error code explanation:
HIWALL (42QHF009DS, 42QHF012DS, 42QHF018DS)
Display
Operation lamp flash times
Timer lamp
E0
1
X
Indoor EEPROM malfunction
E1
2
X
Indoor / outdoor units communication error
E3
4
X
Indoor fan speed has been out of control
E4
5
X
Open or short circuit of T1 temperature sensor
E5
6
X
Open or short circuit of T2 temperature sensor
F1
2
O
Open or short circuit of T4 temperature sensor
F2
3
O
Open or short circuit of T3 temperature sensor
F3
4
O
Open or short circuit of T5 temperature sensor
F4
5
O
Outdoor EEPROM parameter error
F5
6
O
Outdoor fan speed out of control
F6
7
O
Open or short circuit of T2B temperature sensor
P0
1
☆
IPM module protection
P1
2
☆
Voltage protection
P4
5
☆
Inverter compressor drive protection
P5
6
☆
Mode conflict
P6
7
☆
Low pressure protection(Just
38QUS036DS4)
O
(light) X
Failure
(off)
matching
with
☆ (flash)
Light Commercial series (Cassette/Duct)
1
Open or short circuit of T1 temperature sensor
☆
X
X
X
DISPLAY
DIGITAL TUBE
E0
2
Open or short circuit of T2 temperature sensor
X
X
☆
X
E1
3
Indoor / outdoor units communication error
X
☆
X
X
E2
4
Full-water malfunction
X
X
X
☆
E3
5
Indoor EEPROM malfunction
☆
☆
X
X
E4
6
IPM module protection
☆
X
X
O
E5
7
Open or short circuit of T3 or T4 temperature sensor or
Outdoor EEPROM malfunction
☆
O
X
X
E6
8
Outdoor fan speed has been out of control
☆
O
☆
X
E7
9
Indoor fan speed has been out of control
☆
O
O
X
F5
10
Voltage protection
☆
O
X
O
P0
11
Outdoor unit over-current protection
☆
☆
☆
X
P2
12
Inverter compressor drive protection
☆
◎
X
X
P4
13
Mode conflict
☆
X
O
O
P5
NO.
MALFUNCTION
RUN
Timer
☆ Flash(at 2.5Hz) ◎ Flash(at 0.5Hz)
DEF
Alarm
O light
X(off)
Note: Digital display is only available for duct type.
Console series:
Operation
Timer
De-frost
★
X
X
LED STATUS
Open or short circuit of T1 temperature sensor
X
X
★
Open or short circuit of T2 temperature sensor
57 / 78
★
★
X
Indoor / outdoor units communication error
X
Indoor EEPROM malfunction
X
IPM module protection
★
★
★
★
★

Outdoor unit voltage protection
★


Outdoor unit over-current protection
★

X
Top temperature protection of compressor
★
◎
X
Inverter compressor drive protection
★
★
X

Mode conflict

★
Indoor fan speed has been out of control
X
★

Outdoor fan malfunction
X
★
★
★
Open or short circuit of T3 or T4 temperature sensor
★ flash at 5Hz,  light, ◎flash at 0.5Hz, X extinguished
12.2 Outdoor unit error code explanation:
Display
LED STATUS
E0
Outdoor EEPROM malfunction
E2
Indoor / outdoor units communication error
E3
Communication malfunction between IPM board and outdoor main board
E4
Open or short circuit of outdoor unit temperature sensor
E5
Voltage protection
E8
Outdoor fan speed has been out of control
F1
No A Indoor unit coil outlet temperature sensor or connector of sensor is defective
F2
No B Indoor unit coil outlet temperature sensor or connector of sensor is defective
F3
No C Indoor unit coil outlet temperature sensor or connector of sensor is defective
F4
No D Indoor unit coil outlet temperature sensor or connector of sensor is defective
F5
No E Indoor unit coil outlet temperature sensor or connector of sensor is defective
P1
High pressure protection (For 38QUS036DS4)
P2
Low pressure protection (For 38QUS036DS4)
P3
Current protection of compressor
P4
Temperature protection of compressor discharge
P5
High temperature protection of condenser
P6
IPM module protection
Note: Once these error codes display, they will disappear in at least 30 seconds if the unit come back to
normal.(Except E3&E4)
58 / 78
12.3 Trouble shooting
12.3.1 For the indoor unit
12.3.1.1 Indoor EEPROM malfunction
Shut off the power supply and
turn it on 1 minute later. Is it
still displaying the error code?
Yes
If the EEPROM chip
is welded on PCB,
replace the PCB
directly. Otherwise,
check whether the
EEPROM chip
plugged in PCB well?
No
Insert the EEPROM well
Yes
Replace the indoor PCB.
EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and
reprogrammed using a pulsed voltage.
12.3.1.2 Indoor / outdoor units communication error
59 / 78
Indoor / outdoor units communication error
Start: Power off , then Power on the
A/C by the Breaker. (reconnect the
power wire). Is it still displaying the
error code?
Yes
Check wiring on the outdoor and indoor
terminal follow the wiring diagram. Is all
connecting correctly?
No
Reconnect the wiring
No
Reconnect the wiring
Yes
Turn on all indoor unit by remote
controller. Is all indoor unit display
No
Yes
Measure Vs, is it moving
alternately between positive value
and negative value? (Vs is the
voltage between S and N). Refer
PIC 1
A: Is all the wiring between
No
Yes
Yes
Yes
Turn off the all indoor units. Is IPM
power LED or operating LED lamp
On? Refer PIC2
No
terminal and Indoor PCB
connect ok?
Change the Indoor PCB
change IPM
Power on by remote
controller, IIs it still
displaying the error code
Yes
after 3 minutes?
Is main board“
”
lamp on? Refer PIC 3.
No
Is the reactor connecting
well?
No
Reconnect the wiring
No
Yes
Yes
Change Outdoor Main PCB
Is indoor units number correct? Check
on the outdoor check point . (2 for dual
zone, 3 for tri zone, 4 for qua zone).
Refer PIC 4.
No first time
No second time
Trouble is solved
A
Change outdoor unit PCB assembly(include
wiring) totally
60 / 78
No
Operating
Pic 1: check the voltage of N to S (Vs), is it moving
alternately between positive value and negative
value?
Self-Check
Pic 2:IPM or outdoor main PCB (For
38VNM218713)
Pic 3: IPM or outdoor main PCB (For
38VNM327713 / 38VNM436713)
Power,
Self-Check
Operating
PIC 4 :Main board LED when power on and unit
standby.
PIC 5: check point button,
Press 1 time for check how many indoor units are connected
61 / 78
12.3.1.3 indoor unit fan speed has been out of control
Power
Power off,
off, then
then restart
restart the
the
unit
2
minutes
later.
unit 2 minutes later. IsIs itit still
still
displaying
displaying the
the error
error code?
code?
No
The
The unit
unit operates
operates normally.
normally.
Yes
Shut
Shut off
off the
the power
power supply,
supply,
rotate
rotate the
the fan
fan by
by hand.
hand. Does
Does
itit rotate
rotate properly?
properly?
No
Find
Find out
out the
the cause
cause and
and
have
it
solved.
have it solved. For
For
example,
example, whether
whether the
the fan
fan
No
Correct
Correct the
the connections.
connections.
isis blocked
blocked or
or the
the screws
screws
which
which fix
fix the
the fan
fan are
are
tighten.
tighten.
Yes
Check
Check the
the wiring
wiring of
of fan
fan
motor.
motor. Are
Are all
all the
the
connections
connections good?
good?
Yes
Check
Check whether
whether the
the main
main PCB
PCB
isis normal
normal through
through index
index 1?
1?
No
Replace
Replace the
the main
main PCB
PCB
Yes
Replace
Replace the
the fan
fan motor
motor
No
Index 1:
1: Indoor AC fan motor
Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the
voltage of pin1 and pin2. If the value of the voltage is less than 100V(208~240V power supply)or 50V(115V
power supply), the PCB must have problems and need to be replaced.
2. Indoor DC fan motor(control chip is inside fan motor)
Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor
connector. If the value of the voltage is not in the range showing in below table, the PCB must have
problems and need to be replaced.
62 / 78
DC motor voltage input and output
For split type:
NO.
Color
Signal
Voltage
1
Red
Vs/Vm
280V~380V
2
---
---
---
3
Black
GND
0V
4
White
Vcc
14-17.5V
5
Yellow
Vsp
0~5.6V
6
Blue
FG
14-17.5V
For other types:
NO.
Color
Signal
Voltage
1
Red
Vs/Vm
192V~380V
2
---
---
---
3
Black
GND
0V
4
White
Vcc
13.5-16.5V
5
Yellow
Vsp
0~6.5V
6
Blue
FG
13.5-16.5V
63 / 78
12.3.1.4 Open or short circuit of temperature sensor.
Check
Check the
the connections
connections
between
between temperature
temperature
sensor
sensor and
and PCB.
PCB. Are
Are the
the
connections
good?
connections good?
No
Correct
Correct the
the connections.
connections.
Yes
Measure
Measure the
the resistance
resistance value
value
of
of the
the sensor
sensor via
via Appendix
Appendix 11
Is
Is itit normal?
normal?
No
Replace
Replace the
the sensor.
sensor.
Yes
Replace
Replace the
the indoor
indoor PCB
PCB
12.3.1.5 Full-water malfunction(For cassette / A5 duct)
Power
Power off,
off, then
then restart
restart the
the unit
unit 22 minutes
minutes
later.
later. Is
Is itit still
still displaying
displaying the
the error
error code?
code?
Yes
IfIf the
the water-level
water-level switch
switch
is
inserted
is inserted well?
well?
No
Insert
Insert the
the water-level
water-level switch
switch well
well
Yes
Replace
Replace the
the water-level
water-level switch
switch
Yes
IfIf the
the water-level
water-level switch
switch
is
is broken?
broken?
No
Replace
Replace the
the water
water pump,
pump, IfIf
malfunction
malfunction is
is still
still not
not
solved
solved
Yes
Replace
Replace the
the indoor
indoor main
main PCB
PCB
64 / 78
12.3.2 For the outdoor unit
12.3.2 1 Outdoor EEPROM malfunction(ODU E0)
Outdoor EEPROM malfunction
Yes
If the EEPROM chip
is welded on PCB,
replace the PCB
directly. Otherwise,
check whether the
EEPROM chip
plugged in PCB well?
No
Insert the EEPROM well
Yes
Replace the outdoor main board
EEPROM: An electrically erasable programmable read-only memory whose contents can be erased and
reprogrammed using a pulsed voltage.
12.3.2.2 Communication malfunction between IPM board and outdoor main board(ODU E3)
65 / 78
E3 display
Communication malfunction between
IPM board and outdoor main board
Is there at least one LED in
the IPM board light?
No
Check the signal wire between
the IPM board and the main
board, is it connected good?
Yes
No
Yes
Reconnect and retry. Is
error still display?
No
No
Replace IPM board, and
then check whether the
system can run normally
Yes
No
Replace outdoor main
board, and then check
whether the system can run
normally
Yes
No
Replace the electric control
box
Trouble is solved
12.3.2.3 Voltage protection(ODU E5)
66 / 78
Voltage protection
Check the voltage of
outdoor unit power supply,
whether the voltage
between L(L1) and N (L2) is
about 220~240VAC
No
Check the power supply
Yes
Check whether the voltage
of IPM board P and N is
normal? DC277-356V for
18-27KBtu/h; DC277-410V
for 36-42KBtu/h
No
Replace bridge rectifiers,
and then check whether the
system can run normally
Yes
Yes
No
Replace IPM board, and
then check whether the
system can run normally
Yes
No
Replace outdoor main board
Trouble is solved
67 / 78
12.3.2.4 Outdoor unit fan speed has been out of control (E8)
Power
Power off,
off, then
then restart
restart the
the
unit
2
minutes
later.
unit 2 minutes later. IsIs itit still
still
displaying
displaying the
the error
error code?
code?
No
The
The unit
unit operates
operates normally.
normally.
Yes
No
Find
Find out
out the
the cause
cause and
and
have
it
solved.
have it solved. For
For
example,
example, whether
whether the
the fan
fan
No
Correct
Correct the
the connections.
connections.
Shut
Shut off
off the
the power
power supply,
supply,
rotate
rotate the
the fan
fan by
by hand.
hand. Does
Does
itit rotate
rotate properly?
properly?
isis blocked
blocked or
or the
the screws
screws
which
which fix
fix the
the fan
fan are
are
tighten.
tighten.
Yes
Check
Check the
the wiring
wiring of
of fan
fan
motor.
motor. Are
Are all
all the
the
connections
connections good?
good?
Yes
Check
Check whether
whether the
the main
main PCB
PCB
isis normal
normal through
through index
index 1?
1?
No
Replace
Replace the
the main
main PCB
PCB
Yes
Replace
Replace the
the fan
fan motor
motor
No
Index 1:
1. Outdoor DC fan motor(control chip is inside fan motor)
Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor
connector. If the value of the voltage is not in the range showing in below table, the PCB must have
problems and need to be replaced.
DC motor voltage input and output
NO.
Color
Signal
Voltage
1
Red
Vs/Vm
140V~380V
2
---
---
---
3
Black
GND
0V
4
White
Vcc
13.5-16.5V
5
Yellow
Vsp
0~6.5V
6
Blue
FG
15V
68 / 78
12.3.2.5 High pressure protection (ODU P1) (For 38QUS036DS4)
High
High pressure
pressure protection
protection
Whether
Whether the
the wiring
wiring
between
between the
the high
high pressure
pressure
switch
switch and
and main
main control
control
board
board is
is connected
connected well
well or
or
correctly
correctly
No
Connect
Connect itit well
well
Yes
Whether
Whether the
the high
high
pressure
pressure protector
protector
is
is broken
broken
Method:
Method: Disconnect
Disconnect the
the plug.
plug.
Measure
Measure the
the resistance
resistance of
of the
the
high
high pressure
pressure protector,
protector, ifif
the
the protector
protector is
is normal
normal the
the
value
value is
is o,
o,
No
Replace
Replace high
high pressure
pressure protector
protector
Yes
Stop
Stop the
the unit
unit
Yes
Check
Check whether
whether the
the outdoor
outdoor
ambient
ambient temperature
temperature is
is
higher
higher than
than 50℃
50℃
No
Check
Check ifif the
the outdoor
outdoor unit
unit
ventilation
ventilation isis good
good
NO
Make
Make the
the outdoor
outdoor unit
unit ventilate
ventilate well
well
Yes
Check
Check ifif the
the outdoor
outdoor fan
fan runs
runs
properly
properly
No
please
please refer
refer to
to the
the solution
solution of
of fan
fan
speed
speed has
has been
been out
out of
of control
control
malfunction
malfunction .. Find
Find out
out the
the cause
cause and
and
have
have itit solved.
solved.
Yes
Check
Check whether
whether the
the heat
heat
exchanger
exchanger is
is dirty
dirty
Yes
Clean
Clean the
the heat
heat exchanger
exchanger
No
Replace
Replace outdoor
outdoor main
main
board
board
No
Check
Check whether
whether the
the refrigerant
refrigerant
system
system is
is ok
ok
69 / 78
12.3.2.6 Low pressure protection (ODU P2) (For 38QUS036DS4)
Low
Low pressure
pressure protection
protection
Whether
Whether the
the wiring
wiring
between
between the
the low
low pressure
pressure
protector
protector and
and main
main control
control
board
board is
is connected
connected well
well or
or
correctly
correctly
No
Connect
Connect itit well
well
Yes
Whether
Whether the
the low
low
pressure
pressure protector
protector
is
is broken
broken
Method:
Method: Disconnect
Disconnect the
the plug.
plug.
Measure
Measure the
the resistance
resistance of
of the
the
low
low pressure
pressure protector.
protector. If
If the
the
protector
protector is
is normal
normal the
the value
value is
is
oo
No
Replace
Replace low
low pressure
pressure protector
protector
Yes
Stop
Stop the
the unit
unit
Yes
Check
Check whether
whether the
the outdoor
outdoor
ambient
ambient temperature
temperature is
is too
too
low
low
No
Check
Check whether
whether valve
valve core
core
of
of high
high pressure
pressure valve
valve is
is
opened
opened
No
Open
Open fully
fully valve
valve core
core of
of
high
pressure
valve
high pressure valve
No
please
please refer
refer to
to the
the solution
solution of
of fan
fan
speed
speed has
has been
been out
out of
of control
control
malfunction.
malfunction. Find
Find out
out the
the cause
cause and
and
have
have itit solved.
solved.
Yes
Check
Check ifif the
the indoor
indoor fan
fan runs
runs
properly
properly in
in cooling
cooling mode
mode
Yes
Replace
Replace outdoor
outdoor main
main board
board
No
Refrigerant
Refrigerant isis not
not enough
enough add
add the
the
refrigerant
refrigerant
No
Check
Check whether
whether the
the refrigerant
refrigerant
system
is
ok
system is ok
70 / 78
12.3.2.7 Current protection of compressor (ODU P3)
Current protection of compressor
Judge 1: Check whether the
input current of the power
supply wire is higher than max
protection current value
Yes
Check whether
the refrigerant
system is ok
Judge 2: Check whether the
outdoor ambient
temperature is higher than
50℃
Yes
Stop the unit
No
Judge 3: Check whether the
outdoor unit is bad ventilation
Yes
Make the outdoor unit ventilate well
No
Judge 4: Check whether the
heat exchanger is dirty
Yes
Clean the heat exchanger
No
Judge 5: The refrigerant
pipe is blocked
Yes
Let the refrigerant out, then use the high
pressure nitrogen or refrigerant to blow pipe,
vacuumize and charge the refrigerant again
No
Replace outdoor main
board,and check whether
the system can run normally
Yes
No
Replace the electric control box
Model
Max
protection
current
Yes
Trouble is solved
38QUS018DS2
38QUS027DS3
38QUS036DS4
14.5A
16.5A
21.5A
71 / 78
12.3.2.8 Temperature protection of compressor discharge (ODU P4)
Temperature
Temperature protection
protection of
of
compressor
compressor discharge
discharge
Check
Check whether
whether the
the
compressor
compressor discharge
discharge temp.
temp. isis
more
more than
than 115°C
115°C ??
No
Check
Check whether
whether the
the
refrigerant
refrigerant isis leak
leak
Yes
Yes
Stop
Stop leaking
leaking and
and add
add refrigerant
refrigerant
No
Check
whether
the
Check
whether
the
connection
connection is
is right
right between
between
compressor
compressor discharge
discharge temp.
temp.
sensor
sensor and
and PCB
PCB according
according
to
to wiring
wiring diagrams?
diagrams?
No
Correct
Correct the
the wiring
wiring connection
connection
Yes
Measure
Measure the
the resistance
resistance value
value
of
of compressor
compressor discharge
discharge
temp.
temp. sensor.
sensor. IfIf the
the value
value is
is
not
normal
is
normal
refer
not normal is normal refer to
to
No
Replace
Replace the
the compressor
compressor discharge
discharge temp.
temp. sensor
sensor
the
the Appendix
Appendix 2?
2?
Yes
Replace
Replace outdoor
outdoor main
main PCB
PCB
No
Replace
Replace high
high pressure
pressure valve
valve assy
assy
72 / 78
12.3.2.9 High temperature protection of condenser (ODU P5)
When outdoor pipe temperature is more than 65°C, the unit will stop, and unit runs again when outdoor pipe
temp. less than 52°C.
High
High temperature
temperature protection
protection of
of
condenser
condenser
Check
Check the
the connection
connection
between
between temperature
temperature
sensor
sensor and
and PCB.
PCB.
No
No
Correct
Correct the
the connection
connection
Yes
Check
Check whether
whether the
the
condenser
condenser temperature
temperature is
is
Higher
Higher than
than 65°C
65°C
Check
Check whether
whether the
the
resistance
resistance of
of condenser
condenser
temp.
temp. sensor
sensor is
is normal
normal
refer
refer to
to the
the Appendix
Appendix 11
Yes
Check
Check whether
whether the
the outdoor
outdoor
ambient
ambient temperature
temperature is
is
higher
higher than
than 50℃
50℃
Yes
Stop
Stop the
the unit
unit
No
Check
Check ifif the
the outdoor
outdoor unit
unit
ventilation
ventilation isis good
good
No
Make
Make the
the outdoor
outdoor unit
unit ventilate
ventilate well
well
Yes
Check
Check ifif the
the outdoor
outdoor fan
fan runs
runs
properly
properly
No
please
please refer
refer to
to the
the solution
solution of
of fan
fan
speed
speed has
has been
been out
out of
of control
control
malfunction
malfunction .. Find
Find out
out the
the cause
cause and
and
have
have itit solved.
solved.
Yes
Check
Check whether
whether the
the heat
heat
exchanger
exchanger is
is dirty
dirty
Yes
Clean
Clean the
the heat
heat exchanger
exchanger
No
Replace
Replace outdoor
outdoor main
main
board
board
No
Refrigerant
Refrigerant isis not
not enough
enough add
add the
the
refrigerant
refrigerant
No
Check
Check whether
whether the
the refrigerant
refrigerant
system
system is
is ok
ok
73 / 78
Yes
No
Replace
Replace the
the temperature
temperature sensor
sensor
12.3.2.10 IPM module protection (ODU P6)
IPM module protection
Check whether the voltage range
of P-N on IPM module is normal?
DC277-356V for 18-27KBtu/h;
DC277-410V for 36-42KBtu/h
Check whether the input
power supply is correct?
208-230V, 1N, 60Hz
No
Regulate it to correct, then
check whether the system
can work normally?
No
Yes
No
Yes
Check whether the connecting
line between main board and
the IPM module is connected
tightly
Connect it tightly,
check ok or not?
No
Check whether the
power supply line is
connected correctly and
tightly
Connect it correctly
and tightly, check ok
or not?
No
Yes
No
Check whether the connecting
line of the compressor is
connected correctly or tightly
No
Yes
Connect it well, check
ok or not?
No
Check whether the lines
in E-part box are
connected tightly
No
Connect it tightly,
check ok or not?
Yes
No
Yes
Replace the IPM module,
check whether the system can
work normally?
No
Check whether the bridge rectifiers are
normal? Use the multimeter to measure
the resistance between each two
terminals, check whether there is the
condition that value of resistance is 0
No
No
Check if the outdoor fan
runs properly or the outdoor
unit ventilation is good.
Yes
Check whether the resistance of
the fan motor is normal. If not,
replace the fan motor. For other
models, refer to the solution of
fan speed has been out of
control malfunction . F i n d o u t
the cause and have it solved.
Yes
No
Replace the main board; check
whether the system can work
normally?
Yes
Replace the compressor, check
whether the system can work
normally?
Replace the bridge rectifiers
Check whether the connecting line of
every reactor is normal? If the line is
broken, the resistance of the two ports is
∞(models except for M4OA-36HFN1Q,M4OD-28HFN1-Q,
M5OC-36HFN1Q);Check whether the PFC module
broken (for M4OA-36HFN1-Q,M4OD28HFN1-Q,
M5OC-36HFN1-Q,M50D42HFN1-Q)
No
Replace the connecting line or
reactor or replace the PFC
module(for M4OC-36HRFN1M,M50D-42HFN1-Q)
No
Yes
Yes
Yes
Trouble is solved
74 / 78
12.4 Main parts check
1. Temperature sensor checking
Disconnect the temperature sensor from PCB, measure the resistance value with a tester.
Temperature Sensors.
Room temp.(T1) sensor,
Indoor coil temp.(T2) sensor,
Outdoor coil temp.(T3) sensor,
Outdoor ambient temp.(T4) sensor,
Compressor discharge temp.(T5) sensor.
Measure the resistance value of each winding by using the multi-meter.
Appendix 1 Temperature Sensor Resistance Value Table for T1,T2,T3,T4,T2B (℃--K)
℃
K Ohm
℃
K Ohm
℃
K Ohm
℃
K Ohm
-20
115.266
20
12.6431
60
2.35774
100
0.62973
-19
108.146
21
12.0561
61
2.27249
101
0.61148
-18
101.517
22
11.5000
62
2.19073
102
0.59386
-17
96.3423
23
10.9731
63
2.11241
103
0.57683
-16
89.5865
24
10.4736
64
2.03732
104
0.56038
-15
84.2190
25
10.000
65
1.96532
105
0.54448
-14
79.3110
26
9.55074
66
1.89627
106
0.52912
-13
74.5360
27
9.12445
67
1.83003
107
0.51426
-12
70.1698
28
8.71983
68
1.76647
108
0.49989
-11
66.0898
29
8.33566
69
1.70547
109
0.48600
-10
62.2756
30
7.97078
70
1.64691
110
0.47256
-9
58.7079
31
7.62411
71
1.59068
111
0.45957
-8
56.3694
32
7.29464
72
1.53668
112
0.44699
-7
52.2438
33
6.98142
73
1.48481
113
0.43482
-6
49.3161
34
6.68355
74
1.43498
114
0.42304
-5
46.5725
35
6.40021
75
1.38703
115
0.41164
-4
44.0000
36
6.13059
76
1.34105
116
0.40060
-3
41.5878
37
5.87359
77
1.29078
117
0.38991
-2
39.8239
38
5.62961
78
1.25423
118
0.37956
-1
37.1988
39
5.39689
79
1.21330
119
0.36954
0
35.2024
40
5.17519
80
1.17393
120
0.35982
1
33.3269
41
4.96392
81
1.13604
121
0.35042
2
31.5635
42
4.76253
82
1.09958
122
0.3413
3
29.9058
43
4.57050
83
1.06448
123
0.33246
4
28.3459
44
4.38736
84
1.03069
124
0.32390
5
26.8778
45
4.21263
85
0.99815
125
0.31559
6
25.4954
46
4.04589
86
0.96681
126
0.30754
7
24.1932
47
3.88673
87
0.93662
127
0.29974
8
22.5662
48
3.73476
88
0.90753
128
0.29216
9
21.8094
49
3.58962
89
0.87950
129
0.28482
10
20.7184
50
3.45097
90
0.85248
130
0.27770
11
19.6891
51
3.31847
91
0.82643
131
0.27078
12
18.7177
52
3.19183
92
0.80132
132
0.26408
13
17.8005
53
3.07075
93
0.77709
133
0.25757
14
16.9341
54
2.95896
94
0.75373
134
0.25125
15
16.1156
55
2.84421
95
0.73119
135
0.24512
16
15.3418
56
2.73823
96
0.70944
136
0.23916
17
14.6181
57
2.63682
97
0.68844
137
0.23338
18
13.9180
58
2.53973
98
0.66818
138
0.22776
19
13.2631
59
2.44677
99
0.64862
139
0.22231
75 / 78
Appendix 2 Temperature Sensor Resistance Value Table for T5 (℃--K)
℃
K Ohm
℃
K Ohm
℃
K Ohm
℃
K Ohm
-20
542.7
20
68.66
60
13.59
100
3.702
-19
511.9
21
65.62
61
13.11
101
3.595
-18
483
22
62.73
62
12.65
102
3.492
-17
455.9
23
59.98
63
12.21
103
3.392
-16
430.5
24
57.37
64
11.79
104
3.296
-15
406.7
25
54.89
65
11.38
105
3.203
-14
384.3
26
52.53
66
10.99
106
3.113
-13
363.3
27
50.28
67
10.61
107
3.025
-12
343.6
28
48.14
68
10.25
108
2.941
-11
325.1
29
46.11
69
9.902
109
2.86
-10
307.7
30
44.17
70
9.569
110
2.781
-9
291.3
31
42.33
71
9.248
111
2.704
-8
275.9
32
40.57
72
8.94
112
2.63
-7
261.4
33
38.89
73
8.643
113
2.559
-6
247.8
34
37.3
74
8.358
114
2.489
-5
234.9
35
35.78
75
8.084
115
2.422
-4
222.8
36
34.32
76
7.82
116
2.357
-3
211.4
37
32.94
77
7.566
117
2.294
-2
200.7
38
31.62
78
7.321
118
2.233
-1
190.5
39
30.36
79
7.086
119
2.174
0
180.9
40
29.15
80
6.859
120
2.117
1
171.9
41
28
81
6.641
121
2.061
2
163.3
42
26.9
82
6.43
122
2.007
3
155.2
43
25.86
83
6.228
123
1.955
4
147.6
44
24.85
84
6.033
124
1.905
5
140.4
45
23.89
85
5.844
125
1.856
6
133.5
46
22.89
86
5.663
126
1.808
7
127.1
47
22.1
87
5.488
127
1.762
8
121
48
21.26
88
5.32
128
1.717
9
115.2
49
20.46
89
5.157
129
1.674
10
109.8
50
19.69
90
5
130
1.632
11
104.6
51
18.96
91
4.849
12
99.69
52
18.26
92
4.703
13
95.05
53
17.58
93
4.562
14
90.66
54
16.94
94
4.426
15
86.49
55
16.32
95
4.294
16
82.54
56
15.73
96
4.167
17
78.79
57
15.16
97
4.045
18
75.24
58
14.62
98
3.927
19
71.86
59
14.09
99
3.812
76 / 78
B(25/50)=3950K
R(90℃)=5KΩ±3%
2. Compressor checking
Measure the resistance value of each winding by using the tester.
Position
Resistance Value
Unit model
38QUS018DS2
38QUS027DS3
38QUS036DS4
Compressor
DA150S1C-20FZ
DA250S2C-30MT
TNB306FPGMC-L
Blue - Red
0.95Ω(20℃)
0.55Ω(20℃)
0.53Ω(20℃)
77 / 78
3. IPM continuity check
Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital
tester to measure the resistance between P and UVWN; UVW and N.
Digital tester
(+)Red
U
V
Digital tester
(+)Red
(-)Black
N
P
Normal resistance value
(-)Black
U
∞
V
(Several MΩ)
W
(+)Red
W
78 / 78
Normal resistance value
∞
N
(Several MΩ)
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