conexa Corona Plus MSC-09HRDN1 User manual

Corona Plus varmepumper
SERVICEMANUAL
MSC-09HRDN1
MSC-12HRDN1
code: 20112007-0

Content
2
Content
1. Precaution .......................................................................................................................... 1
1.1 Safety Precaution .............................................................................................................................. 1
1.2 Warning ............................................................................................................................................. 1
2. Function.............................................................................................................................. 3
3. Dimension........................................................................................................................... 5
3.1 Indoor unit（Alfa）............................................................................................................................ 5
3.2 Outdoor unit（Alfa）.......................................................................................................................... 5
3.3 Indoor unit（Corona）....................................................................................................................... 6
3.4 Outdoor unit（Corona）.................................................................................................................... 6
4. Specification....................................................................................................................... 7
5. Refrigerant cycle diagram................................................................................................. 8
6. Operation limits.................................................................................................................. 9
6.1 Cooling operation............................................................................................................................... 9
6.2 Heating operation .............................................................................................................................. 9
7. Schematic diagram and Wiring diagram........................................................................ 10
7.1. Schematic diagram .......................................................................................................................... 10
7.2. Wiring diagram ................................................................................................................................ 12
8. Installation details............................................................................................................14
8.1 Wrench torque sheet for installation ................................................................................................ 14
8.2 Connecting the cables ..................................................................................................................... 14
8.3 Pipe length and the elevation .......................................................................................................... 14
8.4 Air purging of the piping and indoor unit .......................................................................................... 15
8.5 Pumping down (Re-installation)....................................................................................................... 16
8.6 Re-air purging (Re-installation)........................................................................................................ 17
8.7 Balance refrigerant of the 2-way, 3-way valves................................................................................ 18
8.8 Evacuation....................................................................................................................................... 19
8.9 Gas charging ................................................................................................................................... 20
9. Pressure table ..................................................................................................................21
9.1 MSH-09HRDN1 ............................................................................................................................... 21
9.2 MSH-12HRDN1 ............................................................................................................................... 21
9.3 MSC-09HRDN1 ............................................................................................................................... 22
9.4 MSC-12HRDN1 ............................................................................................................................... 22
10. Capacity table................................................................................................................... 23
10.1 MSH-09HRDN1 ............................................................................................................................... 23
10.2 MSH-12HRDN1 ............................................................................................................................... 23
10.3 MSC-09HRDN1 ............................................................................................................................... 24
10.4 MSC-12HRDN1 ............................................................................................................................... 25
11. Electronic function........................................................................................................... 26
11.1. Display board................................................................................................................................... 26
11.2. Protection ........................................................................................................................................ 26
11.3. Fan-only mode................................................................................................................................. 26

Content
3
11.4. Cooling mode .................................................................................................................................. 26
11.5. Dehumidifying mode ........................................................................................................................ 27
11.6. Heating mode .................................................................................................................................. 27
11.7. Defrosting operation (Available for heating only). ............................................................................ 29
11.8. Outdoor low temperature protection (optional) ................................................................................ 29
11.9. Automatic operation mode............................................................................................................... 29
11.10. Manual switch.................................................................................................................................. 30
11.11. Timer Function................................................................................................................................. 30
11.12. Sleep mode ..................................................................................................................................... 30
11.13. Auto restart function......................................................................................................................... 30
11.14. Turbo function.................................................................................................................................. 30
11.15. Plasma............................................................................................................................................. 30
12. Model and Parameters..................................................................................................... 31
13. Troubleshooting............................................................................................................... 32
13.1 Indoor Unit Error Display ................................................................................................................. 32
13.2 Diagnostic chart............................................................................................................................... 37
13.3 Resetting phenomenon often occurs during operation .................................................................... 39
13.4 Operation lamp flashes and Timer lamp off ..................................................................................... 39
13.5 Operation lamp flashes and Timer lamp on ..................................................................................... 39
13.6 Operation lamp off and Timer lamp flashes ..................................................................................... 40
13.7 Operation lamp on and Timer lamp flashes ..................................................................................... 40
13.8 Operation lamp flashes, Timer lamp flashes.................................................................................... 40
14 Characteristic of temperature sensor ............................................................................ 41

Service manual
1
1. Precaution
1.1 Safety Precaution
To prevent injury to the user or other people and property damage, the following instructions must be followed.
Incorrect operation due to ignoring instruction will cause harm or damage.
Before service unit, be sure to read this service manual at first.
1.2 Warning
¾Installation
Do not use a defective or underrated circuit breaker.
Use this appliance on a dedicated circuit.
There is risk of fire or electric shock.
For electrical work, contact the dealer, seller, a
qualified electrician, or an Authorized service center.
Do not disassemble or repair the product, there is risk of
fire or electric shock.
Always ground the product.
There is risk of fire or electric shock.
Install the panel and the cover of control box
securely.
There is risk of fire of electric shock.
Always install a dedicated circuit and breaker.
Improper wiring or installation may cause fore or electric
shock.
Use the correctly rated breaker of fuse.
There is risk of fire or electric shock.
Do not modify or extend the power cable.
There is risk of fire or electric shock.
Do not install, remove, or reinstall the unit by
yourself (customer).
There is risk of fire, electric shock, explosion, or injury.
Be caution when unpacking and installing the
product.
Sharp edges could cause injury, be especially careful of
the case edges and the fins on the condenser and
evaporator.
For installation, always contact the dealer or an
Authorized service center.
There is risk of fire, electric shock, explosion, or injury.
Do not install the product on a defective installation
stand.
It may cause injury, accident, or damage to the product.
Be sure the installation area does not deteriorate
with age.
If the base collapses, the air conditioner could fall with it,
causing property damage, product failure, and personal
injury.
Do not let the air conditioner run for a long time
when the humidity is very high and a door or a
windows is left open.
Moisture may condense and wet or damage furniture.
Take care to ensure that power cable could not be
pulled out or damaged during operation.
There is risk of fire or electric shock.
Do not place anything on the power cable.
There is risk of fire or electric shock.
Do not plug or unplug the power supply plug during
operation.
There is risk of fire or electric shock.
Do not touch (operation) the product with wet hands.
There is risk of fire or electric shock.
Do not place a heater or other appliance near the
power cable.
There is risk of fire and electric shock.
Do not allow water to run into electric parts.
It may cause fire, failure of the product, or electric shock.
Do not store or use flammable gas or combustible
near the product.
There is risk of fire or failure of product.
Do not use the product in a tightly closed space for a
long time.
Oxygen deficiency could occur.
When flammable gas leaks, turn off the gas and
open a window for ventilation before turn the
product on.
Do not use the telephone or turn switches on or off.
There is risk of explosion or fire.
If strange sounds, or small or smoke comes from
product. Turn the breaker off or disconnect the
power supply cable.
There is risk of electric shock or fire.
Stop operation and close the window in storm or
hurricane. If possible, remove the product from the
window before the hurricane arrives.
There is risk of property damage, failure of product, or
electric shock.
Do not open the inlet grill of the product during
operation. (Do not touch the electrostatic filter, if the
unit is so equipped.)
There is risk of physical injury, electric shock, or product
failure.
When the product is soaked (flooded or submerged),
contact an Authorized service center.
There is risk of fire or electric shock.
Be caution that water could not enter the product.
There is risk of fire, electric shock, or product damage.
Ventilate the product from time to time when
operating it together with a stove, etc.
There is risk of fire or electric shock.
Turn the main power off when cleaning or
maintaining the product.

Service manual
2
There is risk of electric shock.
When the product is not be used for a long time,
disconnect the power supply plug or turn off the
breaker.
There is risk of product damage or failure, or unintended
operation.
Take care to ensure that nobody could step on or fall
onto the outdoor unit.
This could result in personal injury and product damage.
¾CAUTION
Always check for gas (refrigerant) leakage after
installation or repair of product.
Low refrigerant levels may cause failure of product.
Install the drain hose to ensure that water is drained
away properly.
A bad connection may cause water leakage.
Keep level even when installing the product.
To avoid vibration of water leakage.
Do not install the product where the noise or hot air
from the outdoor unit could damage the
neighborhoods.
It may cause a problem for your neighbors.
Use two or more people to lift and transport the
product.
Avoid personal injury.
Do not install the product where it will be exposed to
sea wind (salt spray) directly.
It may cause corrosion on the product. Corrosion,
particularly on the condenser and evaporator fins, could
cause product malfunction or inefficient operation.
¾Operational
Do not expose the skin directly to cool air for long
periods of time. (Do not sit in the draft).
This could harm to your health.
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 refrigerant
system.
There is risk of damage or loss of property.
Do not block the inlet or outlet of air flow.
It may cause product failure.
Use a soft cloth to clean. Do not use harsh
detergents, solvents, etc.
There is risk of fire, electric shock, or damage to the
plastic parts of the product.
Do not touch the metal parts of the product when
removing the air filter. They are very sharp.
There is risk of personal injury.
Do not step on pr put anything on the product.
(outdoor units)
There is risk of personal injury and failure of product.
Always insert the filter securely. Clean the filter
every two weeks or more often if necessary.
A dirty filter reduces the efficiency of the air conditioner
and could cause product malfunction or damage.
Do not insert hands or other object through air inlet
or outlet while the product is operated.
There are sharp and moving parts that could cause
personal injury.
Do not drink the water drained from the product.
It is not sanitary could cause serious health issues.
Use a firm stool or ladder when cleaning or
maintaining the product.
Be careful and avoid personal injury.
Replace the all batteries in the remote control with
new ones of the same type. Do not mix old and mew
batteries or different types of batteries.
There is risk of fire or explosion.
Do not recharge or disassemble the batteries. Do not
dispose of batteries in a fire.
They may burn of explode.
If the liquid from the batteries gets onto your skin or
clothes, wash it well with clean water. Do not use the
remote of the batteries have leaked.
The chemical in batteries could cause burns or other
health hazards.

Service manual
3
2. Function
Indoor unit
Operation ON/OFF by remote controller
Room temperature sensor.
Pipe temperature sensor.
Sensing by room temperature
Maintain the room temperature in accordance with the setting temperature.
Room temperature control
Prevent the water being freezed on evaporator by sensing
the evaporator pipe temperature in cooling mode
Anti-freezing control in cooling
Restarting is for approx. 3 minutes..
Time Delay Safety control
Turbo wind, high, med, low, breeze.
Indoor fan speed control
The unit will decide the louver direction according to operation mode.
Two-direction air vane
The fan is turn to low speed (cooling/heating).
The unit will be turn off at the seventh hour.
Sleep mode auto control
The function is usually used in rainy days in
springtime or damp areas.
Independent dehumidification
The louver can be set at the desired position or
swing up and down automatically
Air flow Direction control
The mode can be change by the room temperature.
Auto mode
DSP High-speed Chip
Flexible wiring connection
Auto defrost
Temp. Compensation
The function will be operated
in any operation mode.
Plasma (Optional)
Prevent the cold wind at the
beginning of unit start.
Anti-cold function
Self-diag. function
Auto-restart function
When the power supply is interrupted and
then restore, the air conditioners automatically
restore the previous function setting.
Tele Remote control (Optional)
Driving heating at -15
High efficiency (30%)
Work voltage (160v-253v)

Service manual
4
The unit has 3 mins delay between continuousl
y
ON/OFF operations.
Outdoor unit
Power relay control
The hydrophilic fin can improve the heating efficiency at operation mode.
Hydrophilic aluminum fin
It is only operated in the heating operation mode except defrosting operation.
Anti-rust cabinet
Valve protection cover
4 way valve control
Made from electrolytic zinc steel sheet and anti-rust coated components.
It protects the valves and prevents water from dripping.
Low noise air flow system
Bird tail propeller fan makes the outdoor unit run more quietly.
Discharge pipe temperature protect

Service manual
5
3. Dimension
3.1 Indoor unit（Alfa）
3.2 Outdoor unit（Alfa）
Dimension
Mode W H D
9K 750 250 205
12K 815 280 215
Dimension
Mode W H D L1 L2
9K 760 590
285 530 290
12K 760 590
285 530 290

Service manual
6
3.3 Indoor unit（Corona）
3.4 Outdoor unit（Corona）
Dimension
Mode W H D
9K 710 250 195
12K 790 265 195
Dimension
Mode W H D
9K 760 590 285
12K 760 590 285

Service manual
7
4. Specification
Model MSH-09HRDN1 MSH-12HRDN1 MSC-09HRDN1 MSC-12HRDN1
Power supply Ph-V-Hz 1, 220-240V~, 50Hz 1, 220-240V~, 50Hz 1, 220-240V~, 50Hz 1, 220-240V~, 50Hz
Capacity Btu/h 9000 12000 9000 12000
Input W 820 1090 810 1050
Rated current
A
3.8 5 3.3 5.1
Cooling
EER Btu/w.h 10.9 11 11.1 11.4
Capacity Btu/h 11000 13000 10000 14000
Input W 890 1050 810 1130
Rated current
A
4 4.8 3.5 5.2
Heating
COP W/W 3.6 3.6 3.62 3.63
Max. current
A
10 12 12 15
Starting current
A
3.3 4.5 3.3 4.8
Model PA108X1C-4FTDE PA140X2C-4FT DA89X1C-23FZ DA89X1C-23FZ
Type Rotary rotary Rotary Rotary
Brand TOSHIBA TOSHIBA TOSHIBA TOSHIBA
Capacity Btu/h 9000 12000 9040 9040
Input W 920 1200 680 680
Rated current(RLA)
A
4.1 5.4 4.7 4.7
Locked rotor Amp(LRA)
A
18.7 29.9 10 10
Thermal protector MRA13430-9087 UP3RE0591-T56 CS-74 CS-74
Capacitor uF 25 35 No No
Compressor
Refrigerant oil ml 330 480 370 370
Model RPG13H RPG13D RPG18H RPG13D
Brand Welling Welling Welling Welling
Input W 39.5 44 35 44
Capacitor uF 1.2 1.2 1.2 1.5
Indoor fan motor
Speed(hi/mi/lo) r/min 1200/950/850 1220/1000/800 1360/1100/880 1300/1000/800
Indoor air flow (Hi/Mi/Lo) m3/h 570/480/350 500/430/370 500/400/370 580/500/420
Indoor noise level (Hi/Mi/Lo) dB(A) 42/35/30 37/34/31 37/34/30 40/35/30
Model YDK24-6F YDK24-6F YDK24-6F YDK36-6
Brand Welling Welling Welling Welling
Input W 56 56 56 68
Capacitor uF 2.5 2.5 2.5 2.5
Outdoor fan
motor
Speed r/min 800 800 800 900
Outdoor air flow m3/h 1900 1800 1700 1900
Outdoor noise level dB(A) 55 50 51 54
Refrigerant type R410A g 1090 1140 1030 1200
Liquid side/ Gas side mm Ф6.35/Ф9.53 Ф6.35/Ф12.7 Ф6.35/Ф9.53 Ф6.35/Ф12.7
Max. pipe length m 10 10 10 10
Refrigerant
piping Max. in level m 5 5 5 5
Operation temp ℃17-30 17-30 17-30 17-30
Ambient temp ℃-15-45 -15-45 -7-45 -7-45
Application area m2 18-24 14-21 18-24 20-30
Note:
The noise date is base on hemi-anechoic chamber, during actual operation; these values are normally
somewhat different as a result of ambient condition.
The above design and specifications are subject to change without prior notice for product improvement.

Service manual
8
5. Refrigerant cycle diagram

Service manual
9
6. Operation limits
6.1 Cooling operation
Outdoor unit air temp.℃DB
Indoor air temp. ℃DB
Note: The chart is the result from the continuous operation under constant air temperature conditions.
However, excludes the initial pull-down stage.
6.2 Heating operation
Indoor air temp. ℃DB
Outdoor unit air temp.℃DB
Note: The chart is the result from the continuous operation under constant air temperature conditions.
However, excludes the initial pull-down stage.

Service manual
10
7. Schematic diagram and Wiring diagram
7.1. Schematic diagram
7.1.1 Display board
123456
A
B
C
D
6
54321
D
C
B
A
Scale Sheet
Size FCSM No. DWG No. Rev
0 of 0
B
LED2
FROM INDOOR PCB
1
2
3
4
5
6
7
CN1
+5
LED3LED1
+5
Q1
9012
TIME Y
DEF R
AUTO G
R1 102
R11 39 1 R12 39 1 R13 39 1 R14 39 1
R15 22 1
104
C1
C3
104
Q2
9013
R5
102
R6
221
R4 221
R2 102
R3 221
R9 221
R8
102
Q4
9012
Q3
9012
R16 39 1
R17 22 1
C5
104 10u/16V
E4
REC1
R10
151
47u/16V
E2
R7
221
CLK
DATA
REMOTE
+5V
GND
DIGI
8LED
Dsa
1
Dsb
2
Q0
3
Q1
4
Q2
5
Q3
6
GND
7CP 8
MR 9
Q4 10
Q5 11
Q6 12
Q7 13
Vcc 14
IC 1
74HC164
+5
+5
+5
+5 ddpe
f
g
dig.2
dig.1
c
b
a
C6
102
DISP1
DISP2
7.1..2 Indoor main PCB
12345678
A
B
C
D
8
7654321
D
C
B
A
IC6 PC817
3
4
DZ1
24V
C13
473
IC1 0 PC851
NL
1
2
CN 10
1
2
CN 9
X1
2.5 M
R10
1M
RST
C26
104
+5V
R13
10K
1
2
3
IC9 704 2
RST
LED_C DA TA
TXD
CL K
DIG I_C
BU ZZ
ZE RO
RX D
RE MOT E
SD A
SCL
A0 1
A1 2
A2 3
GND 4 SD A
5SCL
6WC
7VCC
8IC11 24C04
+5V
C19 104
R29
10K
R28
10K
SD A
SCL
E11
47uF/16V
R41
8.06K
C24
223
R42
2K
+5V
1
2
CN 14
T1_ room
T1_room
E12
47uF/16V
R36
8.0 6K
C17
223
R27 2K
+5V
1
2
CN 11
T2_ pipe
T2_pipe
E10 100uF/16V
T2_ pipe
T1_ room
SW _K EY
STE P 1
STE P 2
STE P 3
STE P 4
FA N_ BA CK
IND OOR FAN
+5V
E7
100 uF/16V
C10
104
Q3
901 3
R37
12K
C22
223
D14 1N4007
D13 1N4007
R38
12K R39
12K
R40 5. 1 K
+5V
ZERO
B
A
C23
223
E8
47u F/16V
C25
1.2 (1.5) uF/450V
T1 T2
G
TR1
BT131
L1
C2 333 /250V AC
R1
2K
+5V
R3
560
E2
470uF/25V
R4
11K/2W
DZ2
12V
D5
IN4007
R5
11K /2W
L
N
R2 51/1W
IND OORFAN'
1
2
CN 9
N
ZR1
14D681K
C5
333/250VAC
1
2
CN 2
TRANS_ IN
t
PTC1
82RM
1
2
3
4
5
CN 1
FA N_ IN
IC1 PC817
FU SE1
3.1 5A/25 0V
14. 5VAC 350m A
C3
104
E1
220 0uF/25V
D4
D3
D2
D1 Vin
1
GND
2
Vout 3
IC2 7812 +12V
E3
1000uF/25V
C4
104
IN4 007*4
Vin
1
GND
2
Vout 3
IC3 780 5 +5V
E4
470uF/16V
C11
104
CHUCHEN
SEL E CT2
TXD
RX D
R26
2K
R25
5.1 K
R24
680
R19
100K
R20
11K/2W
R21
11K/2W
R22
12K
R23
5.1 K
R18
5.1 K
R17
2K/2W
C15
102
C16
471 /250V
C14
102
D10
D11
E9
100 uF/35V
POWER CIRCUIT
COMMUNICATE CIRCUIT
CORTROL CIRCUIT
R32
10K
+5V
+5V
SEL E CT3
+5V
Q2 901 3
SEL E CT3
R34
5.1 K
D15
IN4 148
C20
103
+5V
1
2
3
CN 13
FA N_ BA CK
+12V
FA N_ BA CK
A
B
1
2
CN 10
L
IN4 007
1
CN 8
S
IN4007
J3
SEL E CT1P50 1
P51 2
P52 3
P53 4
ANI0 5
ANI1 6
ANI2 7
ANI3 8
VSS 9
P10 10
P11 11
P30 12
P31 13
P32 14
P33 15
P20 16 P21
17
P22
18
P23
19
P24
20
VP P
21
RE SET
22
X2
23
X1
24
VD D
25
P25
26
P26
27
P00
28
P01
29
P02
30
P03
31
P04
32
IC8
uPD 7891 89(32 P)
R43
1K
IN4 749
1
23
4
2
1
1
2
4
3
C8
104
E5
100 0uF/25V ISO GND
D9
D8
D7
D6
Vin
1
GND
2
Vout 3
IC7 7812 ISO +12V
E6
470uF/25V
C9
104
IN4 007*4
1
2
3
4
CN 5
TRANS_ OUT
R31
10K
+5V
SEL E CT2
J2
R33
10K
+5V
SEL E CT1
J1
DISPLAY
C18
102
+5V
RE MOT E
R30 100
R14
10K
R15
10K
R16
10K
+5V
1
2
3
4
5
6
7
CN 7
DIG I _C
DATA
CL K
LED_C
1
2
3
CN 4
IN1
1
IN2
2
IN3
3
IN4
4
IN5
5
IN6
6
IN7
7
VSS
8VDD 9
OU T7 10
OU T6 11
OU T5 12
OU T4 13
OU T3 14
OU T2 15
OU T1 16
IC4
IC/ ULN2 003
C7
104
+12V
1
2
3
4
5
CN 8
STE P 1
STE P 2
STE P 3
STE P 4
BU ZZ
INDOORFAN
B1
R8
1K
+12V
IC5 PC817
R7
1K
R6
2K
Q1
9013
R9
5.1 K
ISO +12V ISO GND
CHUCHEN
IND OORFAN'
1
2CN 12
ISO+12V
1
2CN 6
SW 1 C21
104
R35
10K
+5V
SW _K EY
1
2
4
1
14. 5VAC 200m A
C1
472
1
P-1
GND
R11
100K
C12
104

Service manual
11
7.1.3 Outdoor main PCB
123456
A
B
C
D
6
54321
D
C
B
A
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
27 28 29 30 3231
33
35
34
36
37
38
39
40
41
42
44
45
46
47
48
49
50
51
52535455565758596064 63 62 61
43
TMS320F242
(64QFP)
IOPC7
IOPC6
IOPC0
CAP3/IOA5
CAP2/QEP1/IOPA4
CAP1/QEP0/IOPA3
VDD
VSS
VDD
VSS
VSSA
VDDA
ADCIN07
VREFHI
VREFLO
ADCIN06
ADCIN05
ADCIN04
ADCIN03 ADCIN02 ADCIN01 ADCIN00
/RESET TCK TDI TDO TMS /TRST
Vss
VDD
IOPC5
IOPC4
IOPC3
IOPC2
SCIRX/IOPA1
SCITX/IOPA0
XTAL2
XTAL1
VDD
VSS
VSS
VDD0
PWM1/PA6
PWM2/PA7 PWM3/PB0 PWM4/PB1 PWM5/PB2
PTM
PD0
Vccp
TP2 TP1
Vdd
Vss
C16C15
XTAL1
1
2
CN1 R7
R8 C7
+5V
R18 L4
C17
+5V
J3(Comm Select)
FAN
TXD
RXD
POWER
4-WAY
1 2
3 4
5 6
7 8
910
11 12
13 14
15 16
IC2
+12V
D5
R11
R16
18
19
20 21 22 23 24 25 26
Compress Top
R1
R2
R3
R4
R6
R5
+5V
+5V
+5V
D2
+5V
C8R12
R14
R15
R13
C9
EVP
OUT-TEMP
1
2
CN2
1
2
Outdoor Entironment Sensor
Outdoor Pipe Sensor
+5V
+5V
C6
R10
R9
+5V
IPM
C1
R31
R12
D3 R21
R22 C10 C11
CT1
4148
R24
EMU1
EMU0
VSS
VDD
NC
IOPC1
1
2
3
4
5
6
7
8
9
10
CZ2
+5
+12
Pro
Pro
+5V
C22 C20
R23
1
2
3
IC1
C12
+5
C13
12 34 56 78 910
1112 1314
CN10
R36
R25
R35
+5
+5
+5
C14
+5V
R32
R30
LED
LED
R29
C23
C25
C4
LED
Current Detect
+5
1
2
CN4 C19
C21
R34 R33
W-
W+
V-
V+
U-
U+
1
2
3
4
5
6
7
8
9
10
11
CN1
CON11
AC-IN
AC-IN
FAN'
4-WAY'
GND
TXD
RXD
+5V
+12V
POWER1
AC-IN
FAN'
4-WAY'
link to power circuit
7.1.4 Outdoor power PCB
1234
A
B
C
D
4
321
D
C
B
A
FS1
20A/250VAC C1
474/250V
ZMR2
14D681
ZMR1
14D681
C5
472
C4
472
C2
474/250V
t
PTC1
RL3
RL2
RL1
C84C7
103
C81 C85C83 C8
103
AS1
T1
H38-20A-6MH
+12V
C15
2.5U
+12V
560uF/400V *6
POWER1
AC V+
AC V-
DB1
L2 R1812
Filter
C6
50uF/450V
C82 C86
1
2
3
4
5
6
7
8
9
10
11
CN1
CON11
POWER1
+12V
+5V
RXD
TXD
GND
4-WAY
L.FAN
H.FAN
AC-IN
T3
R26
5.1K
D1
IN4007
R28
12K
C21
104
IC6 PC817
IC5 PC851
+5V
TXD
R30
3.5K/7W
C23
471/250V
RXD
1
23
4
1
2
3
4
+12V
POWER1
FS2
3.15A/250VAC
L1
R8025
L3
R18J04D
4-WAY FAN
L
N
P-2
P-5
P-6
IPM BOARD
P-4
P-3
RL3-4
P-1
+5
AC V+
AC V-
DB2
CN4
FAN.H
CN7
CAP
CN5
COM
CN6
4-WAY
S
Power Circuit

Service manual
12
7.2. Wiring diagram
7.2.1 MSH-09HRDN1, MSH-12HRDN1

Service manual
13
7.2.2 MSC-09HRDN1, MSC-12HRDN1

Service manual
14
8. Installation details
8.1 Wrench torque sheet for installation
Outside diameter Torque
mm inch Kg.m
φ6.35 1/4 1.8
φ9.52 3/8 4.2
φ12.7 1/2 5.5
φ15.88 5/8 6.6
φ19.05 3/4 6.6
8.2 Connecting the cables
The power cord of connect should be selected according to the following specifications sheet.
Grade
Unit 7K 9K 12K
mm21.0 1.0 1.5
8.3 Pipe length and the elevation
Pipe size
Capacity
Btu/h GAS LIQUID
Standard
length
(m)
Max.
Elevation
B (m)
Max.
Elevation
B (m)
Additional
refrigerant
(g/m)
3/8’’ (φ9.52) 1/4’’ (φ6.35) 5 5 10 30
7k~12K 1/2’’ (φ12.7) 1/4’’ (φ6.35) 5 5 10 30
1/2’’ (φ12.7) 1/4’’ (φ6.35) 5 8 15 30
5/8’’ (φ15.88) 1/4’’ (φ6.35) 5 10 20 30
18K~28K
5/8’’ (φ15.88) 3/8’’ (φ9.52) 5 10 20 65
Caution:
Capacity is base on standard length and maximum allowance length is base of reliability.
Oil trap should be install per 5-7 meters.
In case that
more than 5m.

Service manual
15
8.4 Air purging of the piping and indoor unit
Required tools:
Hexagonal wrench; adjustable wrench; torque wrenches, wrench to hold the joints and gas leak detector.
Note:
The air in the indoor unit and in the piping must be purged. If air remains in the refrigeration piping, it will
affect the compressor, reduce the cooling capacity, and could lead to a malfunction of unit.
Be sure, using a torque wrench to tighten the service port cap (after using the service port), so that it
prevents the gas leakage from the refrigeration cycle.
Procedure
1. Recheck the piping connections.
2. Open the valve stem of the 2-way valve
counterclockwise approximately 90’, wait
10 seconds, and then set it to closed
position.
Be sure to use a hexagonal wrench to operate
the valve stem
3. Check for gas leakage.
Check the flare connection for gas leakage
4. Purge the air from the system.
Set the 2-way valve to the open position and
remove the cap from the 3-way valve’s
service port.
Using the hexagonal wrench to press the
valve core pin, discharge for three seconds
and then wait for one minute.
5. Use torque wrench to tighten the service
port cap to a torque of 1.8 kg.m. (18n.m)
6. Set the 3-way valve to the opened
position.
7. Mounted the valve stem nuts to the 2-way
and 3-way valves.
8. Check for gas leakage.
At this time, especially check for gas leakage
from the 2-way and 3-way stem nuts, and
from the service port.
Caution:
If gas leakage is discovered in step (3) above,
take the following measures.
If the leaks stop when the piping connections are
tightened further, continue working from step (4).
If the gas leaks do not stop when the connections
are retightened, repair the location of the leak,
discharge all of the gas through the service port,
and then recharge with the specified amount of
gas from a gas cylinder.

Service manual
16
8.5 Pumping down (Re-installation)
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. Operate the unit for 10 to 15 minutes.
3. Stop operation and wait for 3 minutes, then connect the charge set to the service port of the
3-way valve.
Connect the charge hose with the push pin to the gas service port.
4. Air purging of the charge hose.
Open the low-pressure valve on the charge set slightly to purge air from the charge hose.
5. Set the 2-way valve to the close position.
6. Operate the air conditioner at the cooling cycle and stop it when the gauge indicates 0.1MPa.
7. Immediately set the 3-way valve to the closed position.
Do this quickly so that the gauge ends up indicating 0.3 to 0.5Mpa.
8. Disconnect the charge set, and amount the 2-way and 3-way valve’s stem nuts and service
port caps.
Use a torque wrench to tighten the service port cap to a torque of 1.8 kg.m.
Be sure to check for gas leakage.