KOREL M2OC-18HFN8-Q User manual

SERVICE MANUAL
TEHNIČKI PRIRUČNIK
KOREL AIRCONDITIONER
EUROPE MARKET
SUPER DC INVERTER MULTI TYPE
M2OG-14HFN8-Q = X
M2OC-18HFN8-Q = K20C-18FN8 = K20C-18HFN8
M2OD-18HFN8-Q =x
M3OF-21HFN8-Q = K30-21FN8
M3OF-27HFN8-Q = K30-27FN8 = K30-37HFN8
M3OE-27HFN8-Q = x
M4OB-36HFN8-Q = K40-36HFN8
M5OD-42HFN8-Q = K50-42FN8
M4OE-28HFN8-Q = X
DC MULTI OUTDOOR UNITS

1
CONTENTS
1. General information of Outdoor Units..................................2
2. Features..................................................................................3
3. Dimensions.............................................................................4
4. Refrigeration Cycle Diagram.................................................5
5. Wiring diagram.......................................................................7
6. Indoor units combination....................................................14
7. Sound Levels........................................................................16
8. Installation Details ...............................................................17
8.1 Wrench torque sheet for installation........................................................................... 17
8.2 Connecting the cables................................................................................................ 17
8.3 Pipe length and the elevation..................................................................................... 17
8.4 Installation for the first time......................................................................................... 18
8.5 Adding the refrigerant after running the system for many years................................ 21
8.6 Re-installation while the indoor unit need to be repaired........................................... 22
8.7 Re-installation while the outdoor unit need to be repaired......................................... 24
9. Electronic control function..................................................26
10. Troubleshooting.................................................................31
Caution: Risk of fire/flammable materials

2
1. General information of Outdoor Units
Model name
Dimension (mm)
Compressor
M2OG-14HFN8-Q
800x333x554
KSN140D21UFZ
M2OC-18HFN8-Q
800x333x554
KSM135D23UFZ
M2OD-18HFN8-Q
800x333x554
KSN140D21UFZ
M3OF-21HFN8-Q
845x363x702
KSN140D21UFZ
M3OE-27HFN8-Q
845x363x702
KTF235D22UMT
M3OF-27HFN8-Q
845x363x702
KTM240D57UMT
M4OB-36HFN8-Q
946x410x810
KTF310D43UMT
M4OE-28HFN8-Q
946x410x810
KTM240D57UMT
M5OD-42HFN8-Q
946x410x810
KTF310D43UMT

3
2. Features
The hydrophilic fin can improve the heating efficiency at operation mode.
It protects the valves and prevents water from dripping.
4 way valve control
It is only operated in the heating operation mode except defrosting operation.
Outdoor unit
Power relay control
Hydrophilic aluminum fin
Anti-rust cabinet
Valve protection cover
Low noise air flow system
Discharge pipe temperature protection

4
3. Dimensions
Model
Unit：mm
W
D
H
W1
A
B
M2OG-14HFN8-Q
800
333
554
860
514
340
M2OC-18HFN8-Q
800
333
554
860
514
340
M2OD-18HFN8-Q
800
333
554
860
514
340
M3OF-21HFN8-Q
845
363
702
923
540
350
M3OE-27HFN8-Q
845
363
702
923
540
350
M3OF-27HFN8-Q
845
363
702
923
540
350
M4OE-28HFN8-Q
946
410
810
1034
673
403
M4OB-36HFN8-Q
946
410
810
1034
673
403
M5OD-42HFN8-Q
946
410
810
1034
673
403
A
B
D

5
4. Refrigeration Cycle Diagram
4.1 Refrigeration circuit drawing of inverter 1 drive 2 type
L IQ U ID V A L V E A
G A S V A L V E A
H E A T
E X C H A N G E
(E V A P O R A T O R )
H E A T
E X C H A N G E
(C O N D E N S ER )
C o m p r e s so r
4 -W A Y V A L V E
C O O L IN G
H E A T IN G
T 2 E v a p o ra to r
te m p . se n s o r
m id d le
T 1 R o o m
te m p . se n s o r
T3
C o n d e n s e r
te m p . se n s o r
T 5 D is c h a rg e
te m p . se n s o r
T 4 A m b ie n t
te m p . se n s o r
IN D O O R O U T D O O R
E X V A C A P IL L A R Y A
C H E C K V A L V E
C A P ILL A R Y T U B E
E X V B C A P IL L A R Y B
L IQ U ID V A L V E B
G A S V A L V E B
A c c u m u la to r
T 2 B - A E v apo ra to r
te m p. sens o r outle t
T 2 B - B
4.2 Refrigeration circuit drawing of inverter 1 drive 3 type
L IQ U ID V A L V E A
G A S V A L V E A
H E A T
E X C H A N G E
(E V A P O R A T O R )
H E A T
E X C H A N G E
(C O N D E N S E R )
C o m p re s s o r
4 -W A Y V A L V E
C O O LIN G
H E A T IN G
T 2 E v a p o ra to r
te m p . s e ns o r
m id d le
T 1 R o o m
te m p . s e ns o r
T3
C o n d e n s e r
te m p . s e ns o r
T 5 D is c h a rg e
te m p . s e ns o r
T 4 A m b ie n t
te m p . s e ns o r
IN D O O R O U T D O O R
E X V A C A P IL LA R Y A
C H E C K V A L V E
C A P ILL A R Y T U B E
E X V B C A P IL LA R Y B
L IQ U ID V A L V E B
G A S V A L V E B
E X V C C A P ILL A R Y C
L IQ U ID V A L V E C
G A S V A L V E C
A c c u m u la to r
T 2 B - A E v a p o ra to r
te m p . s en s o r o u tle t
T 2 B -B
T 2 B -C

6
4.3 Refrigeration circuit drawing of inverter 1 drive 4 type
L IQ U ID V A L V E A
G A S V A L V E A
H E A T
E X C H A N G E
(E V A P O R A T O R )
H E A T
E X C H A N G E
(C O N D E N S E R )
C o m p r e ssor
4 -W A Y V A L V E
C O O L IN G
H E A T IN G
T 2 E v a p o ra to r
te m p . s enso r
m id d le
T 1 R o om
te m p . s enso r
T3
C o n d e n s er
te m p . s enso r
T 5 D is c h a rg e
te m p . s enso r
T 4 A m b ie nt
te m p . s enso r
IN D O O R O U T D O O R
E X V A C A P IL LA R Y A
C H E C K V A L V E
C A P ILLA R Y T U B E
E X V B C A P IL LA R Y B
L IQ U ID V A L V E B
G A S V A L V E B
E X V C C A P IL LA R Y C
L IQ U ID V A L V E C
G A S V A L V E C
E X V D C A P IL LA R Y D
L IQ U ID V A L V E D
G A S V A L V E D
A c c u m u la to r
H ig h p re s s ure
sw itc h
L o w p re s s u re
sw itc h
T 2 B -A E v a p ora tor
te m p . s en sor o u tle t
T 2 B -B
T 2 B -C
T 2 B -D
4.4 Refrigeration circuit drawing of inverter 1 drive 5 type
L IQ U ID V A L V E A
G A S V A LV E A
H E A T
E X C H A N G E
(E V A P O R A T O R ) H E A T
E X C H A N G E
(C O N D E N S E R )
C O O L IN G
H E A T IN G
T 2 E v a p o ra tor
tem p . s e n so r
m id d le
T 1 R o o m
tem p . s e n so r
T3
Condenser
tem p . s e n so r
T 4 A m b ie n t
tem p . s e n so r
IN D O O R O U T D O O R
E X V A C A P ILL A R Y A
C H E C K V A L V E
C A P ILL A R Y T U B E
E X V B C A P ILL A R Y B
L IQ U ID V A L V E B
G A S V A L V E B
E X V C C A P IL LA R Y C
L IQ U ID V A L V E C
G A S V A L V E C
E X V D C A P IL LA R Y D
L IQ U ID V A L V E D
G A S V A L V E D
E X V E C A P ILL A R Y E
L IQ U ID V A L V E E
G A S V A L V E E
C om p re ss or
4 -W A Y V A L V E
T 5 D isc h a rg e
tem p . s e n so r
A ccum u la to r
H ig h p ressu re
sw itc h
L o w p re s sure
sw itc h
T 2 B -A E v a p o ra to r
te m p. s e nso r o utle t
T 2 B -B
T 2 B -C
T 2 B -D
T 2 B -E

7
5. Wiring diagram
M2OC-18HFN8-Q
M2OG-14HFN8-Q

8
M2OD-18HFN8-Q

9
Note: S(1)&S(2) are used in other type of models. They don't need to be connected in multi models.

10
M3OE-27HFN8-Q

11
M3OF-21HFN8-Q, M3OF-27HFN8-Q
M4OE-28HFN8-Q

12
M4OB-36HFN8-Q

13
M5OD-42HFN8-Q

14
6. Indoor units combination
6.1 Indoor unit combination for M2OG-14HFN8-Q
One unit
Two unit
7
7+7
9+9
9
7+9
9+12
12
7+12
18
6.2 Indoor unit combination for M2OC-18HFN8-Q&M2OD-18HFN8-Q
One unit
Two unit
7
7+7
9+9
9
7+9
9+12
12
7+12
12+12
18
6.3 Indoor unit combination for M3OE-21HFN1-Q
One unit
Two unit
Three unit
7
7+7
9+9
7+7+7
7+9+9
9
7+9
9+12
7+7+9
9+9+9
12
7+12
9+18
7+7+12
18
7+18
12+12
6.4 Indoor unit combination for M3OE-27HFN8-Q&M3OF-27HFN8-Q
One unit
Two unit
Three unit
7
7+7
7+18
9+18
7+7+7
7+9+12
9+12+12
9
7+9
9+9
12+12
7+7+9
7+12+12
12+12+12
12
7+12
9+12
12+18
7+7+12
9+9+9
18
7+9+9
9+9+12
6.5 Indoor unit combination for M4OE-28HFN8-Q
One unit
Two unit
Three unit
Four unit
7
7+7
9+9
12+18
7+7+7
7+9+12
9+9+18
7+7+7+7
7+7+9+12
9
7+9
9+12
12+24
7+7+9
7+9+18
9+12+12
7+7+7+9
7+9+9+9
12
7+12
9+18
18+18
7+7+12
7+12+12
12+12+12
7+7+7+12
9+9+9+9
18
7+18
9+24
7+7+18
9+9+9
7+7+9+9
24
7+24
12+12
7+9+9
9+9+12

15
6.6 Indoor unit combination for M4OB-36HFN8-Q
6.7 Indoor unit combination for M5OD-42HFN8-Q
One Unit
Two Unit
Three Unit
7
7+7
9+18
7+7+7
7+9+18
9+9+12
12+12+12
9
7+9
9+24
7+7+9
7+9+24
9+9+18
12+12+18
12
7+12
12+12
7+7+12
7+12+12
9+9+24
12+12+24
18
7+18
12+18
7+7+18
7+12+18
9+12+12
12+18+18
24
7+24
12+24
7+7+24
7+12+24
9+12+18
9+9
18+18
7+9+9
7+18+18
9+12+24
9+12
7+9+12
9+9+9
9+18+18
Four Unit
7+7+7+7
7+7+9+18
7+9+9+12
7+12+12+12
9+9+12+18
7+7+7+9
7+7+9+24
7+9+9+18
7+12+12+18
9+9+12+24
7+7+7+12
7+7+12+12
7+9+9+24
9+9+9+9
9+12+12+12
7+7+7+18
7+7+12+18
7+9+12+12
9+9+9+12
9+12+12+18
7+7+7+24
7+7+12+24
7+9+12+18
9+9+9+18
12+12+12+12
7+7+9+9
7+7+18+18
7+9+12+24
9+9+9+24
12+12+12+18
7+7+9+12
7+9+9+9
7+9+18+18
9+9+12+12
Five Unit
7+7+7+7+7
7+7+7+9+18
7+7+9+12+12
7+9+9+9+18
9+9+9+12+12
7+7+7+7+9
7+7+7+12+12
7+7+9+12+18
7+9+9+12+12
9+9+12+12+12
7+7+7+7+12
7+7+7+12+18
7+7+12+12+12
7+9+12+12+12
7+7+7+7+18
7+7+9+9+9
7+7+12+12+18
9+9+9+9+9
7+7+7+9+9
7+7+9+9+12
7+9+9+9+9
9+9+9+9+12
7+7+7+9+12
7+7+9+9+18
7+9+9+9+12
9+9+9+9+18
One unit
Two unit
Three unit
Four unit
7
7+7
9+18
7+7+7
7+9+12
7+18+18
9+12+18
7+7+7+7
7+7+9+12
7+9+9+12
9+9+9+12
9
7+9
9+24
7+7+9
7+9+18
9+9+9
9+12+24
7+7+7+9
7+7+9+18
7+9+9+18
9+9+9+18
12
7+12
12+12
7+7+12
7+9+24
9+9+12
9+18+18
7+7+7+12
7+7+12+12
7+9+12+12
9+9+12+12
18
7+18
12+18
7+7+18
7+12+12
9+9+18
12+12+12
7+7+7+18
7+7+12+18
7+12+12+12
9+12+12+12
24
7+24
12+24
7+7+24
7+12+18
9+9+24
12+12+18
7+7+9+9
7+9+9+9
9+9+9+9
12+12+12+12
9+9
18+18
7+9+9
7+12+24
9+12+12
9+12

16
7. Sound Levels
Note: H= 0.5 ×height of outdoor unit
Model
Noise Power dB(A)
Noise level dB(A)
M2OG-14HFN8-Q
64
57
M2OC-18HFN8-Q
56
53
M2OD-18HFN8-Q
65
55.5
M3OF-21HFN8-Q
66
57.5
M3OE-27HFN8-Q
65
59
M3OF-27HFN8-Q
67
59.5
M4OE-28HFN8-Q
69
61
M4OB-36HFN8-Q
68
63
M5OD-42HFN8-Q
71
62
H
1.0m
Outdoor Unit
Microphone

17
8. Installation Details
8.1 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)
8.2 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.
8.3 Pipe length and the elevation
Maximum piping length and height difference
1 drive 2
1 drive 3
1 drive 4
1 drive 5
Max. length for all rooms (m)
40
60
80
80
Max. length for one IU (m)
25
30
35
35
Max. height difference between IU and OU (m)
15
15
15
15
Max. height difference between IUs (m)
10
10
10
10
Additional refrigerant charge
1 drive 2
1 drive 3
1 drive 4
1 drive 5
Chargeless pipe
length (m)
15
22.5
30
37.5
Additional
refrigerant charge
(g)
12 x (length for all
rooms - 15)
12 x (length for all
rooms –22.5)
12 x (length for all
rooms - 30)
12 x (length for all
rooms –37.5)
Caution:
●Refrigerant pipe diameter is different according to indoor unit to be connected. When using the
extension pipe, refer to the tables below.

18
●When refrigerant pipe diameter is different from that of outdoor unit union (for 18K&24K indoor unit),
additional transfer connector needs to be used on outdoor unit union.
Indoor unit
Extension pipe diameter (mm/inch)
Model
Pipe diameter (mm/inch)
7K9K12K
Liquid
6.35(1/4)
Liquid
6.35(1/4)
Gas
9.52(3/8)
Gas
9.52(3/8)
18K
Liquid
6.35(1/4)
Liquid
6.35(1/4)
Gas
12.7(1/2)
Gas
12.7(1/2)
24K
Liquid
9.52(3/8)
Liquid
9.52(3/8)
Gas
15.9(5/8)
Gas
15.9(5/8)
Outdoor unit union diameter (mm/inch)
1 drive 2
Liquid
6.35(1/4) *2
Gas
9.52(3/8) *2
1 drive 3
Liquid
6.35(1/4) *3
Gas
9.52(3/8) *3
1 drive 4
Liquid
6.35(1/4) *4
Gas
9.52(3/8) *3
12.7(1/2) *1
1 drive 5
Liquid
6.35(1/4) *5
Gas
9.52(3/8) *4
12.7(1/2) *1
8.4 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

19
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.
(Indoor unit)
(Liquid side)
(Gas side)
Vacuum
pump
Vacuum
pump
Lo
Hi
Handle Hi
Two-way valve
Close
Manifold valve
Compound meter
Pressure
gauge
-0.1MPa
Handle Lo
Charge hose
Charge hose
(Outdoor unit)
Close
Three-way valve