Samsung MH18ZC1(C2)-09 User manual

SERVICE Manual
ROOM AIR CONDITIONER
INDOOR UNIT
MH18ZC1(C2)-09
MH19ZC1(C2)-07
MH19ZC1(C2)-12
MH24ZC1(C2)-12
MH26ZC1(C2)-07
MH26ZC1(C2)-12
OUTDOOR UNIT
MH18ZC1(C2)X
MH19ZC1(C2)X
MH24ZC1(C2)X
MH26ZC1(C2)X
CONTENTSAIR CONDITIONER
1. Precautions
2. Product Specifications
3. Operating Instructions and
Installation
4. Disassembly and Reassembly
5. Troubleshooting
6. Exploded Views and Parts List
7. PCB Diagrams
8. Wiring Diagrams
9. Schematic Diagrams
DB98_08726A(1)<SM_co 12/19/11 5:25 PM Page 3

1-1Samsung Electronics
1. Warning: Prior to repair, disconnect the power
cord from the circuit breaker.
2. Use proper parts: Use only exact replacement
parts. (Also, we recommend replacing parts
rather than repairing them.)
3. Use the proper tools: Use the proper tools and
test equipment, and know how to use them.
Using defective tools or test equipment may
cause problems later-intermittent contact, for
example.
4. Power Cord: Prior to repair, check the power
cord and replace it if necessary.
5. Avoid using an extension cord, and avoid
tapping into a power cord. This practice may
result in malfunction or fire.
6. After completing repairs and reassembly,
check the insulation resistance.
Procedure: Prior to applying power, measure
the resistance between the power cord and the
ground terminal. The resistance must be
greater than 30 megohms.
7. Make sure that the grounds are adequate.
8. Make sure that the installation conditions are
satisfactory.
Relocate the unit if necessary.
9. Keep children away from the unit while it is
being repaired.
10. Be sure to clean the unit and its surrounding
area.
1. Precautions
Fig. 1-1 Avoid Dangerous Contact
Fig. 1-2 No Tapping and No Extension Cords
Fig. 1-3 No Kids Nearby!
Fig. 1-4 Clean the Unit
DB98_08726A(1)<SM_1 12/19/11 4:33 PM Page 1-1

MEMO
Samsung Electronics1-2
DB98_08726A(1)<SM_1 12/19/11 4:33 PM Page 1-2

2-1Samsung Electronics
2. Product Specifications
2-1 Table
Model
Item
Type Kw
Cooling/Heating BTU/h
Kcal/h
Dehumiditying L/h
Air volume(Cooling/Heating) m3/min
Noise dB
Power ø-V-Hz
Power Consumption Air volume(Cooling/Heating) W
Operating Current Air volume(Cooling/Heating) A
Starting current(A/B-Unit) A
Power cord(Option)
Connection cable(Option)
Fuse capacity A
Outer WxHxD mm
Dimension inch
Weight kg
Refrigerant pipe Liquid OD(mm)xL(m)
Gas OD(mm)xL(m)
Drain hose OD(mm)xL(m)
Type
Model name
Capacitor
Motor Type
Rated output W
Type
Motor Type
Rated output W
Heat exchange
Refrigerant control unit
Freezer oil capacity cc
Refrigerant to caarge(R22)
Protection device
Cooling test condition
Maxium operation condition
MH18ZC1(C2)
INDOOR UNIT
MH18ZC1(C2)-09
OUTDOOR UNIT
MH18ZC1(C2)X
Compressor
Blower
Power
Size
Perfor-
mance
Wall-Mounting Multi Split
2.63/2.78 5.26/5.56
9000/9500 18000/19000
2268/2394 4536/4788
1.2 -
7.0/7.5 -
36 55
1-220-240V~, 50Hz
890/890 1780/1780
4.0/4.0 8.0/8.0
22.0/22.0
2.5 x 3core
1.0 x 4core
3.15 -
790 x 245 x 165 787 x 620 x 320
31.1 x 9.64 x 6.50 30.98 x 24.41 x 12.6
7.7 56.0
ø6.35 x 5 -
ø9.52 x 5 -
ø18.0 x 2 -
- Rotary
-A:44B092JW1EL
B:44B092JW1EL
-A:30µF 420VAC
B:30µF 420VAC
--
--
Resin Steel
Cross-flow Propeller
22 30
2Row 12Step 2Row 24Step
A/B-Unit:Capillary tube
-A:360
B:360
A-Unit:750g, B-Unit:850g
-A:MRA12037-12007
B:MRA12037-12007
Indoor unit:DB27˚C WB19˚C Outdoor unit:DB35˚C WB24˚C
Indoor unit:DB32˚C WB23˚C Outdoor unit:DB43˚C WB26˚C
DB98_08726A(1)<SM_1 12/19/11 4:33 PM Page 2-1

Samsung Electronics2-2
Table (cont.)
Model
Item
Type Kw
Cooling/Heating BTU/h
Kcal/h
Dehumiditying L/h
Air volume(Cooling/Heating) m3/min
Noise dB
Power ø-V-Hz
Power Consumption Air volume(Cooling/Heating) W
Operating Current Air volume(Cooling/Heating) A
Starting current(A/B-Unit) A
Power cord(Option)
Connection cable(Option)
Fuse capacity A
Outer WxHxD mm
Dimension inch
Weight kg
Refrigerant pipe Liquid OD(mm)xL(m)
Gas OD(mm)xL(m)
Drain hose OD(mm)xL(m)
Type
Model name
Capacitor
Motor Type
Rated output W
Type
Motor Type
Rated output W
Heat exchange
Refrigerant control unit
Freezer oil capacity cc
Refrigerant to caarge(R22)
Protection device
Cooling test condition
Maxium operation condition
MH24ZC1(C2)
INDOOR UNIT
MH24ZC1(C2)-12
OUTDOOR UNIT
MH24ZC1(C2)X
Compressor
Blower
Power
Size
Perfor-
mance
Wall-Mounting Multi Split
3.51/3.80 7.02/7.60
12000/13000 24000/26000
3024/3276 6048/6552
1.8 -
8.5/9.0 -
40 59
1-220-240V~, 50Hz
1280/1350 2560/2700
5.6/5.8 11.2/11.6
26.5/26.5
2.5 x 3core
1.0 x 4core
3.15 -
790 x 245 x 165 1000 x 790 x 310
31.1 x 9.64 x 6.50 39.37 x 31.1 x 12.2
7.7 69.0
ø6.35 x 5 -
ø12.7 x 5 -
ø18.0 x 2 -
- Rotary
-A:48A124JV1EG
B:48A124JV1EG
-A:30µF 420VAC
B:30µF 420VAC
--
--
Resin Steel
Cross-flow Propeller
22 80
2Row 12Step 2Row 30Step
A/B-Unit:Capillary tube
-A:410
B:410
A-Unit:1000g, B-Unit:1000g
-A:MRA12030-12008
B:MRA12030-12008
Indoor unit:DB27˚C WB19˚C Outdoor unit:DB35˚C WB24˚C
Indoor unit:DB32˚C WB23˚C Outdoor unit:DB43˚C WB26˚C
DB98_08726A(1)<SM_1 12/19/11 4:33 PM Page 2-2

2-3Samsung Electronics
MH19ZC1(C2) MH26ZC1(C2)
INDOOR UNIT
MH19ZC1(C2)-07
INDOOR UNIT
MH19ZC1(C2)-12
OUTDOOR UNIT
MH19ZC1(C2)X
INDOOR UNIT
MH26ZC1(C2)-12
INDOOR UNIT
MH26ZC1(C2)-07
OUTDOOR UNIT
MH26ZC1(C2)X
Wall-Mounting Multi Split
2.05/2.05 3.51/3.80 5.56/5.85 3.51/3.80 2.49/2.34 7.61/7.61
7000/7000 12000/13000 19000/20000 12000/13000 8500/8000 26000/26000
1764/1764 3024/3276 4788/5040 3024/3276 2142/2016 6552/6552
0.9 1.8 - 1.8 0.9x2 -
5.5/6.0 8.5/9.0 - 8.5/9.0 5.5/6.0 -
33 40 55 41 35 61
1-220-240V~, 50Hz
700/640 1230/1200 1930/1840 1320/1330 1240/1150 2560/2480
3.1/2.9 5.3/5.3 8.4/8.2 5.8/5.8 5.4/5.1 11.2/10.9
17.0/26.5
2.5 x 3core
1.0 x 4core
3.15 3.15 - 3.15 3.15 -
790 x 245 x 165 790 x 245 x 165 787 x 620 x 320 790 x 245 x 165 790 x 245 x 165 1000 x 790 x 310
31.1 x 9.64 x 6.50 31.1 x 9.64 x 6.50 30.98 x 24.41 x 12.6 31.1 x 9.64 x 6.50 31.1 x 9.64 x 6.50 39.37 x 31.1 x 12.2
7.7 7.7 57.0 7.7 7.7 70.0
ø6.35 x 5 ø6.35 x 5 - ø6.35 x 5 ø6.35 x 5 -
ø9.52 x 5 ø12.7 x 5 - ø12.7 x 5 ø9.52 x 5 -
ø18.0 x 2 ø18.0 x 2 - ø18.0 x 2 ø18.0 x 2 -
- - Rotary - - Rotary
--
A:44A070JW1EC -- A:48A124JV1EG
B:48A124JV1EG B:48A124JV1EG
--
A:25µF 450VAC -- A:30µF 420VAC
B:30µF 420VAC B:30µF 420VAC
------
------
Resin Resin Steel Resin Resin Steel
Cross-flow Cross-flow Propeller Cross-flow Cross-flow Propeller
22 22 30 22 22 80
2Row 12Step 2Row 12Step 2Row 24Step 2Row 12Step 2Row 12Step 2Row 30Step
A/B-Unit:Capillary tube A-Unit:Capillary tube, B/C-Unit:Auto Expansion valve
--
A:260 -- A:260
B:410 B:410
A-Unit:740g, B-Unit:950g A-Unit:860g, B/C-Unit:1250g
--
A:MST24AMN-12008 -- A:MRA12030-12008
B:MRA12030-12008 B:MRA12030-12008
Indoor unit:DB27˚C WB19˚C Outdoor unit:DB35˚C WB24˚C
Indoor unit:DB32˚C WB23˚C Outdoor unit:DB43˚C WB26˚C
DB98_08726A(1)<SM_1 12/19/11 4:33 PM Page 2-3

Samsung Electronics2-4
2-2 Dimensions
2-2-1 Indoor Unit
245
165
790
Air
in
(Front view)
(Remote control)
Air out
Installation plate
2245
115
DB98_08726A(1)<SM_1 12/19/11 4:33 PM Page 2-4

Product Specifications
2-5Samsung Electronics
2-2-2 Outdoor Unit
2-2-2(a) MH24ZC1(C2)X
2-2-2(b) MH18ZC1(C2)X/MH19ZC1(C2)X
(Front view) (Rear view)
1000 340
790
310
660
(Front view) (Rear view)
582
787 340
620
320
DB98_08726A(1)<SM_1 12/19/11 4:33 PM Page 2-5

Product Specifications
Samsung Electronics2-6
2-2-2 Outdoor Unit
2-2-2(c) MH26ZC1(C2)X
(Front view) (Rear view)
1000 340
790
310
660
DB98_08726A(1)<SM_1 12/19/11 4:33 PM Page 2-6

2-7Samsung Electronics
2-3 Refrigerating Cycle Block Diagram
2-3-1 MH18ZC1(C2)X / MH19ZC1(C2)X / MH24ZC1(C2)X
STD Pressure Piping Temp.(˚C) Temp. Condition (˚C)
Operating Condition (kg/cm2G) T1 T2 Indoor Outdoor
3-way valve DB WB DB WB
Standard 5.0~5.2 11 10 27 19 35 24
A or B Max over load 5.4~5.6 17 16 32 23 43 26
Cooling Low temp. 3.5~3.7 4 3 21 15 21 15
Standard 5.0~5.2 12 10 27 19 35 24
A + B Max over load 5.4~5.6 17 16 32 23 43 26
Low temp. 3.5~3.7 4 3 21 15 21 15
Standard 17~19 38 59 20 15 7 6
A or B Max over load 19~25 56 49 27 19 24 18
Heating Deice - - - 20 12 2 1
Standard 17~19 33 55 20 15 7 6
A + B Max over load 19~25 56 48 27 19 24 18
Deice - - - 20 12 2 1
INDOOR UNIT OUTDOOR UNIT
Capillary tube Capillary tube
Heat
exchanger
(Condenser)
4Way valve
3Way valve
2Way valve
Compressor-B
Compressor-A
Gas side
Liquid side
Cross fan
Cross fan
Propeller fan
T2
T1
(A) (B)
Check valve
Cooling
Heating
Gas leak
check point
Heat
exchanger
(Evaporator)
Refrigerating cycle temperature and pressure
DB98_08726A(1)<SM_1 12/19/11 4:33 PM Page 2-7

Product Specifications
Samsung Electronics2-8
2-3-2 MH26ZC1(C2)X
DB98_08726A(1)<SM_1 12/19/11 4:33 PM Page 2-8

3-1Samsung Electronics
3. Operating Instructions and Installation
3-1 Operating Instructions
3-1-1 The Feature of key in remote controller
(DOWN)
Press until the appearance. the air condition cools or heats
the room as quickly as possible. after 30minutes, the air,
the airconditioner is reset automatically to the previous mode
FEATURE OF KEY
(UP)
NO
1
2
3
4
5
6
7
8
9
Adjust air flow vertically.
Power On/Off button to start and stop airconditioner or timer set up
Temp. up button. To increase the temperatute by the pressing
the temperature button
Temp. down button. To decrease the temperature by the pressing
the temperature button
FUNCTION OF KEY
Each time you press this button
Mode is changed in the following order : Auto Mode : Dry Mode
: Cool Mode : Fan Only
Press until the appearance. the sleep timer can be used when
you are cooling or heating your room to switch the air conditioner off
automatically after a perriod of six hours.
Each time you press this button,
FAN SPEED is changed in the following order.
The ON Timer enables you to switch on the air conditioner automatically
after a given period of time that is from 30 minutes to 24 hours.
To cancel the On Time, press the (Set/Cancel) button.
The Off Timer enables you to switch off the air conditioner automatically
after a given period of time that is from 30 minutes to 24 hours.
To cancel the On Time, press the (Set/Cancel) button.
To select the 5 way function with the remote control, press the 5 way
button one or more times until the desired mode is selected..
Each time you press the 5 way button
Each 5 way indicator on the indoor unit comes on in or der.
DB98_08726A(1)<SM_1 12/19/11 4:34 PM Page 3-1

Operating Instructions and Installation
Samsung Electronics3-2
3-1-2 Name & Function of Key in remote controller
1. AUTO MODE : In this mode, operation
mode(COOL, HEAT) is selected automati-
cally by the room temperature of initial
operation.
∆T= -1˚C, -2˚C, 0˚C+1˚C+2˚C
∆T is controlled by setting temperature
up/down key of remote controller
2. COOL MODE : The unit operates accord-
ing to the difference between the setting
and room temperature. (18˚C~30˚C)
3. HEAT MODE : The unit operates accord-
ing to the difference between the setting
and room temperature.(16˚C~30˚C)
*Prevention against cold wind : For about
3~5 minutes after initial operation, thermo
control or “de-ice”, the indoor fan will
either not operate or operate very slowly,
then switch to the selected fan speed. This
period is to allow the indoor unit's heat-
exchanger to prewarm before emitting
warm air.
*High temperature release function : The
outdoor unit for and compressor ON/OFF
control for safety operation, when the
overheat is heat exchanger of indoor unit.
*De-ice : Deicing operation is controlled
by indoor unit's heat exchanger tempera-
ture and accumulating time of compres-
sor's operation.
De-ice end by sensing of the processing
time by de-ice Condition.
4. DRY MODE : Has 3 states, each deter-
mined by room temperature.
The unit operates in DRY mode.
*Compressor ON/OFF Time is controlled
compulsorily(can not set up the fan speed,
always breeze).
*Protective function : Low temperature
release. (Prevention against freeze)
5. TURBO MODE : This mode is available in
AUTO, COOL, HEAT, DRY, FAN MODE.
When this button is pressed at first, the
air conditioner is operated “powerful”
state for 30 minutes regardless of the set
temperature, room temperature.
When this button is pressed again, or
when the operating time is 30 minutes,
turbo operation mode is canceled and
returned to the previous mode.
*But, if you press the TURBO button in
DRY or FAN mode that is changed with
AUTO mode automatically.
6. SLEEP MODE : Sleep mode is available
only in COOL or HEAT mode.
The operation will stop after 6 hours.
*In COOL mode : The setting temperature
is automatically raised by 1˚C each 1hour
When the temperature has been raised by
total of 2˚C, that temperature is main-
tained.
*In HEAT mode : The setting temperature
is automatically droped by 1˚C each
1hour.
When the temperature has been droped by
total of 2˚C, that temperature is main-
tained.
7. FAN SPEED : Manual (3 step), Auto (4
step)
Fan speed automatically varies depending
on both the difference between setting and
the room temperature.
Room Temp
Tr≥21˚C+∆T
21˚C +∆T>Tr
Operation Type
Cool Operation (Set Temp:AUTO SETTING)
Heat Operation (Set Temp : 22˚C+∆T)
DB98_08726A(1)<SM_1 12/19/11 4:34 PM Page 3-2

Operating Instructions and Installation
3-3Samsung Electronics
8. COMPULSORY OPERATION :
For operating the air conditioner without
the remote controller.
*AUTO : The operating is the same func-
tion that AUTO MODE in the remote con-
troller. And each time you press the button
the 5WAY func-tion is changed as follow.
STD ➝ NATURE ➝ POWER ➝ SAVING
➝ SILENCE ➝ POWER OFF
Each time you press This button, 5WAY
function is changed in the following order
STD(standard) ➝ NATURE ➝
Quenching(High-speed) ➝ Saving(Power-
Saving) ➝ Quite
❊ STD(standard)( ) : General operation
Mode
❊ NATURE( ) : The unit is operated
according to health
pattern control
❊ POWER( ) : The unit is operated in
powerful state
❊ SAVING( ) : The unit is operated in
power saving state
❊ SILENCE( ) : The unit is operated
quitely
Each mode has Auto, Cool and SLEEP
operation designed in advance.
9. SWING : BLADE-H is rotated vertically
by the stepping motor.
*Memory louver : When ON/OFF button
is pressed at stop state, the BLADE-H
returns to its original location which is
operating state before stop
*Swing Set : Press the button under the
remote control is displayed on LCD the
and the blades move up and down. If the
one more time press the button, blatles
location is stop.
10. 24-Hour ON/OFF Real Setting Timer. :
The air conditioner is turned ON at a spec-
ified time using .
OFF TIMER : The air Conditioner is
turned OFF at a specified time using .
*ON TIMER : Only timer LED lights on.
*OFF TIMER : Both timer and operation
LED lights on.
11. SELF Diagnosis
12. BUZZER SOUND : Whenever the
ON/OFF button is pressed or whenever
change occurs to the condition which is set
up or select, the compulsory operation
mode, buzzer is sounded "beep".
Indoor unit room temperature sensor
error(open or short)
Check Point
LED DISPLAY
TIMER
NATURE STD
POWER SAVING SILENCE
: LED blinking : LED off
Indoor unit heat exchanger temperature
sensor error(open or short)
Indoor fan mal function
EEPROM error
Option error(option wasn’t set up or
option data error)
DB98_08726A(1)<SM_1 12/19/11 4:34 PM Page 3-3

Samsung Electronics3-4
3-2 Technical Document
3-2-1(a) MH24ZC1(C2)-12 / MH19ZC1(C2)-12 / MH26ZC1(C2)
•Cooling Characteristics - Outdoor Temperature
Test Condition Indoor Unit (DB/WB) : 27/19
Voltage/Frequency : 240V/50Hz
•In case of 2Unit, Capacity & Current multiplied by 2
Cooling Capacity(Btu/h)
Air Outlet Temperature(DB)
13000 15
14
13
12000
11000
Cooling Capacity Air Outlet Temp
Outdoor Temperature(DB/WB)
21/15 21/19 35/24 43/26
Current (A)
Low Pressure (Kg/cm2)
77
6
5
4
6
5
4
Current Low Pressure
Outdoor Temperature(DB/WB)
21/15 21/19 35/24 43/26
Cooling Capacity & Air Outlet Temperature
Current & Low Pressure
DB98_08726A(1)<SM_1 12/19/11 4:34 PM Page 3-4

Operating Instructions and Installation
3-5Samsung Electronics
•Heating Characteristics - Outdoor Temperature
Test Condition Indoor Unit (DB/WB) : 20/15
Voltage/Frequency : 240V/50Hz
•In case of 2Unit, Capacity & Current multiplied by 2
Cooling Capacity(Btu/h)
Air Outlet Temperature(DB)
14000
12000
13000
44
42
40
38
36
34
32
30
11000
10000
9000
8000
7000
Heating Capacity Air Outlet Temp
Outdoor Temperature(DB/WB)
7/6 2/1 -5/-6
Current (A)
Low Pressure (Kg/cm2)
722
17
12
7
6
5
4
Current Low Pressure
Outdoor Temperature(DB/WB)
Heating Capacity & Air Outlet Temperature
Current & Low Pressure
7/6 2/1 -5/-6
DB98_08726A(1)<SM_1 12/19/11 4:34 PM Page 3-5

Operating Instructions and Installation
Samsung Electronics3-6
3-2-1(b) MH18ZC1(C2)-09 / MH19ZC1(C2)-07 / MH26ZC1(C2)-07
• Cooling Characteristics - Outdoor Temperature
Test Condition Indoor Unit(DB/WB) : 27/19
Voltage/Frequency : 240V/50Hz
Cooling Capacity(Btu/h)
Air Outlet
Temperature(DB)
10000
Cooling Capacity
Outdoor Temperature(DB/WB)
21/15 35/24 43/26
Air Outlet Temp.
7000
8000
9000
15
14
13
12
11
10
Low Pressure(kg/cm2)
Cooling Capacity Low Pressure
Cooling Capacity(Btu/h)
10000
Outdoor Temperature(DB/WB)
21/15 35/24 43/26
7000
8000
9000
7
8
4
3
5
6
Cooling Capacity & Air Outlet Temperature
Cooling Capacity & Low Pressure
DB98_08726A(1)<SM_1 12/19/11 4:34 PM Page 3-6

Operating Instructions and Installation
3-7Samsung Electronics
• Heating Characteristics - Outdoor Temperature (B or C Indoor Unit Only)
Test Condition Indoor Unit(DB/WB) : 20/15
Voltage/Frequency : 240V/50Hz
Heating Capacity(Btu/h)
Air Outlet
Temperature(DB)
10500
Heating Capacity
Outdoor Temperature(DB/WB)
7/6 2/1
Air Outlet Temp.
7500
8500
9500
44
43
42
41
40
39
38
37
36
35
34
High Pressure(kg/cm2)
Heating Capacity High Pressure
Heating Capacity(Btu/h)
10500
Outdoor Temperature(DB/WB)
7/6 2/1
7500
8500
9500
24
23
22
21
20
19
18
17
16
15
14
Heating Capacity & Air Outlet Temperature
Heating Capacity & High Pressure
DB98_08726A(1)<SM_1 12/19/11 4:34 PM Page 3-7

MEMO
Samsung Electronics3-8
DB98_08726A(1)<SM_1 12/19/11 4:34 PM Page 3-8

4-1Samsung Electronics
4. Disassembly and Reassembly
4-1 Indoor Unit
Stop operation of the airconditioner and remove the power plug from the wall outlet before
repairing the unit
No Parts Procedure Remark
1 Front Grille 1) Stop the air conditioner operation and block
the main power.
2) Seperate tape of front panel upper.
3) Contract the second finger to the left, and
right handle and pull to open the inlet grille.
4) Take the left and right filter out.
5) Loosen one of the right fixing screw and
seperate the terminal cover.
6) Loosen three fixing screws of front grille.
7) Pull the upper left and right of discharge
softly for the outside cover to be pulled out.
8) Pull softly the lower part of discharge and
push it up.
Caution;
Assemble the front panel and fix the
hooks of left and right.
*Taking off the deodorizing filter.
DB98_08726A(1)<SM_1 12/19/11 4:34 PM Page 4-1