Mitsubishi Electric MSH-C18TV User manual

SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················5
3. SPECIFICATION·················································7
4. NOISE CRITERIA CURVES·······························8
5. OUTLINES AND DIMENSIONS ························ 9
6. WIRING DIAGRAM···········································11
7. REFRIGERANT SYSTEM DIAGRAM··············13
8. PERFORMANCE CURVES······························15
9. MICROPROCESSOR CONTROL ····················23
10. SERVICE FUNCTIONS·····································33
11. TROUBLESHOOTING······································35
12. DISASSEMBLY INSTRUCTIONS·····················47
13. PARTS LIST······················································53
14. OPTIONAL PARTS···········································58
Wireless type
Model
MSH-C18TV - (WH) · MUH-C18TV -
MSH-C24TV - (WH) · MUH-C24TV - E1E1
E1E1
No. OB279
MSH-C18TV -
MSH-C24TV - E1
E1
HFC
utilized
R407C
OB279-1.qxp 2/15/01 10:44 AM Page 1

2
TECHNICAL CHANGES
1
MSH-C18SV - ➔MSH-C18TV -
1. Rated voltage has changed to 230V.
2. Remote controller has changed.
• SLEEP MODE function has been removed.
• ECONO COOL operation has added.
• SWING button has been removed, but SWING MODE function has available by VANE CONTROL button.
3. Indoor electronic control P.C. board has changed.
MSH-C24TV -
New model
MUH-C18SV - ➔MUH-C18TV -
1. Path of heat exchanger has changed.
2. Temperature of defrosting control has changed. (-3:➜-2.7:)
3. Capillary tube has changed.
[{3.0 o{1.6 o750 (2pcs) ➜{3.0 o{1.4 o600 (2pcs), {3.0 o{2.0 o500 ➜{3.0 o{2.0 o850, {3.0 o{2.0 o350 has
removed.]
4. Refrigerant filling capacity has changed. (1.70kg ➜1.60kg)
MUH-C24TV -
New model
E1
E1E1
E1
E1E1
OB279-1.qxp 2/15/01 10:44 AM Page 2

3
Lubricant
Refrigerant
New refrigerant
R407C
R32: R125: R134a (23%:25%:52%)
Non-azeotropic refrigerant
Not included
A1/A1
86.2
-43.6
0.9177
42.5
Non combustible
0
1530
From liquid phase in cylinder
Impossible
Incompatible oil
Non
Non
Previous refrigerant
R22
HCFC22 (100%)
Single refrigerant
Included
A1
86.5
-40.8
0.94
44.4
Non combustible
0.055
1700
Gas phase
Possible
Compatible oil
Light yellow
Non
Refrigerant
Composition (Ratio)
Refrigerant handling
Chlorine
Safety group (ASHRAE)
Molecular weight
Boiling point (:)
Steam pressure [25:](Mpa [Gauge])
Saturated steam density [25:](Kg/K)
Combustibility
ODP w1
GWP w2
Refrigerant charge method
Additional charge on leakage
Kind
Color
Smell
w1:Ozone Destruction Parameter : based on CFC11
w2 :Global Warmth Parameter : based on CO2
INFORMATION FOR THE AIR CONDITIONER WITH R-407C REFRIGERANT
This room air conditioner adopts HFC refrigerant (R407C) which will never destroy the ozone layer.
Pay attention to following points.
1Take sufficient care not to allow water and other contaminations to enter the R407C refrigerant during storage and
installation, since it is more susceptible to contaminations than HCFC (R22) refrigerant.
2Clean refrigerant pipings should be used.
3Composition change may occur in R407C since it is a mixed refrigerant. When charging, charge liquid refrigerant to
prevent composition change.
4Be especially careful when managing the tools.
If dust, dirt, or water mixes in the refrigerant cycle, it may cause decrease of performance.
New Specification Previous Specification
The incompatible lubricant easily separates from refrigerant
and makes the layer in the upper inside the suction muffler.
The higher position of the returning oil hole enables to return
the lubricant of the upper layer to the compressor.
Since refrigerant and lubricant are compatible each other,
lubricant returns to the compressor through the lower
position returning oil hole.
Compressor
Suction muffler
Returning oil hole
Lubricant
Refrigerant
Compressor
Suction muffler
Returning oil hole
Lubricant and Refrigerant
Compressor
-30 -20 -10 0 10 20 30 40 50 60
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
(MPa[Gauge])
R407C
R22
Conversion chart of refrigerant temperature and pressure
Saturated liquid pressure
(:)
NOTE : The unit of pressure has been changed to MPa on the
international system of units(SI unit system).
The conversion factor is: 1(MPa[Gauge]) =10.2(kgf/ff[Gauge])
OB279-1.qxp 2/15/01 10:44 AM Page 3

4
1.Tools dedicated for the air conditioner with R407C refrigerant
The following tools are required for R407C refrigerant. Some R22 tools can be substituted for R407C tools.
Do not use tools that are used with R22 refrigerant in order to avoid mixing oils.
R407C tools Can R22 tools be used?
Gas leak detector
A gauge manifold with a sight glass is recommended for charging the
liquid refregerant.
Hose material have been changed to improve the pressure
resistance.
Dedicated for HFC refrigerant.
Description
Provided to prevent the back flow of oil. This adapter enables you to use
existing vacuum pumps.
No
No
No
Yes
Yes
New
New
Gauge manifold
Charge hose
Torque wrench
Flare tool
Vacuum pump
adapter
Electronic scale for
refrigerant charging Use the electronic control scale for measuring the R407C.
2.Refrigerant piping
Do not use copper pipes which are broken, deformed or discoloured.
In addition, be sure that the inner surfaces of the pipes are clean, free of hazardous sulfur and oxides, or have no dust/ dirt,
shaving particles, oil, moisture or any other contamination.
•If there is a large amount of residual oil inside the piping and joints, deterioration of the refrigerant oil will result.
3.Refrigerant oil
Apply the specific refrigeration oil (accessories) to the flare and the union seat surfaces.
4.Air purge
Use the vacuum pump for air purge to protect environments, and to avoid changing the composition of refrigerant.
5.Additional charge
For additional charging, charge the refrigerant with liquid phase slowly using a gas cylinder. If the refrigerant is charged with
gas phase, the composition of refrigerant will change. In this case, ability of the refrigerating cycle decreases or normal
operation can be impossible.
If liquid refrigerant is rapidly charged at once, the compressor may be locked.
NOTE: 1. The R407C is mixed refrigerant which consist of three different kinds of evaporative temperature. As a result, the
R407C occurs the change of composition.
2. Additional refrigerant charge has been changed by change of refrigerant.(R22 ➔R407C)
R22 : <MUH-18 type> 50g/m ➔R407C : <MUH-C18TV> 35g/m
: <MUH-24 type> 65g/m ➔R407C : <MUH-C24TV> 45g/m
Electronic scale for
refrigerant charging
Refrigerant
gas cylinder
operating
valve
Refrigerant gas cylinder
for R407C with siphon
Refrigerant (liquid)
Gage manifold
Outdoor unit
Indoor unit
Union
Liquid pipe
Gas pipe
Service port
Stop valve
Charge hose
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5
PART NAMES AND FUNCTIONS
2
INDOOR UNIT


,

(When the grille is open)
Front panel
MSH-C18TV -
MSH-C24TV - E1
E1
Drainage hose
Piping
Air inlet
Air outlet
Drain outlet
(back and side)
OUTDOOR UNIT
MUH-C18TV - E1
Air inlet Air outlet
MUH-C24TV - E1
ACCESSORIES
Indoor unit
1
2
3
4
5
6
7
Installation plate
Installation plate fixing screw 4 o25 mm
Remote controller mouting hardware
Fixing screw for 3o3.5 o1.6 mm (Black)
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
1
6
1
2
2
1
1
MSH-C18TV-
MSH-C24TV- E1
E1
Outdoor unit
8
9
Drain socket
Drain cap {33
Drain cap {16
1
6
—
1
2
1
MUH-C18TV- E1 MUH-C24TV- E1
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6
REMOTE CONTROLLER
MSH-C18TV -
MSH-C24TV - E1
E1
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
ECONO COOL
STOP
START
HR.
MIN.
I FEEL COOL
HEAT
DRY
PM
CLOCK
AM
RESET CLOCK
Open the front lid.
Signal transmitting section
Operation display section
OPERATE /STOP
(ON /OFF)button
TEMPERATURE buttons
OPERATION SELECT button
FAN SPEED CONTROL button
OFF-TIMER button
HR. button
MIN. button
(TIME SET button)
ON-TIMER button
RESET button
ECONO COOL button
VANE CONTROL button
CLOCK SET button
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7
SPECIFICATION
3
Indoor model
Function
Power supply
Capacity
Dehumidification
Air flow(High)
Power outlet
Running current
Power input
Auxiliary heater
Power factor
Starting current
Fan motor current
Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Air direction
Sound level (High)
Fan speed (High)
Fan speed regulator
Thermistor RT11(at25:)
Thermistor RT12(at25:)
Outdoor model
Air flow
Compressor motor current
Fan motor current
Model
Output
Winding
resistance(at20:)
Model
Winding
resistance(at20:)
Dimensions WOHOD
Weight
Sound level
Fan speed (High)
Fan speed regulator
Refrigerant filling
capacity(R407C)
Refrigerating oil (Model)
Thermistor
RT61(at0:)
Thermistor
RT63(at0:)
kW
r/h
K/h
A
A
W
A(kW)
%
A
A
"
mm
kg
dB
rpm
k"
k"
K/h
A
A
W
"
"
mm
kg
dB
rpm
kg
cc
k"
k"
MSH-C18TV - E1
Single phase
230V, 50Hz
756
15
—
98
55
0.25
RA4V27-EF
WHT-BLK 183.8
BLK-RED 250.5
1,015O320O190
14
5
42
1,180
3
10
10
MUH-C18TV - E1
2,196
0.39
PE-36VPEHT
1,600
C-R 1.06
C-S 2.03
RA6V50-OG
WHT-BLK 116.4
BLK-RED 111.0
850o605o290
54
52
828
1
1.60
1,100 (NEO22)
33.18
—
Cooling
5.2
2.4
9.4
2,110
2.46
8.76
Heating
6.0
—
9.7
2,180
2.75
9.06
MSH-C24TV - E1
Single phase
230V, 50Hz
816
25
—
83
0.29
RA4V27-EE
WHT-BLK 183.3
BLK-RED 250.5
1,015O320O190
14
5
45
1,260
3
10
10
MUH-C24TV - E1
2,700
0.58
NE-47VMHHT
2,200
C-R 0.67
C-S 2.02
RA6V85-AA
WHT-BLK 62.7 BLK-YLW 30.2
YLW-RED 62.9
870o850o295
71
53
735
2
2.00
1,400 (NEO22)
33.18
33.18
Cooling
6.3
3.0
12.8
2,850
97
2.21
11.93
Heating
7.5
—
13.7
3,020
96
2.48
12.87
Electrical data
Fan motor
Special remarks
Compressor
Electrical data
Fan motor
Special remarks
Capacity
Coefficient of performance(C.O.P)
Capacity
NOTE:Test conditions are based on JIS C 9612.
Cooling : Indoor Dry-bulb temperature 27°C / Wet-bulb temperature 19°C
Outdoor Dry-bulb temperature 35°C / Wet-bulb temperature (24°C)
Heating : Indoor Dry-bulb temperature 20°C / Wet-bulb temperature
Outdoor Dry-bulb temperature 7°C / Wet-bulb temperature 6°C
OB279-1.qxp 2/15/01 10:44 AM Page 7

8
NOISE CRITERIA CURVES
4
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
42
SPL(dB(A)) LINE
High
NOTCH
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15.5:
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 27: Wet-bulb temperature 19:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
45
SPL(dB(A)) LINE
High
NOTCH
Heating : Dry-bulb temperature 20: Wet-bulb temperature 15.5:
MSH-C18TV- E1 MSH-C24TV- E1
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
52
SPL(dB(A)) LINE
High
NOTCH
Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 35: Wet-bulb temperature 24:
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
53
SPL(dB(A)) LINE
High
NOTCH
Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:
MUH-C18TV- E1 MUH-C24TV- E1
OB279-1.qxp 2/15/01 10:44 AM Page 8

9
OUTLINES AND DIMENSIONS
5
Unit: mm
OUTDOOR UNIT
MSH-C18TV -
MSH-C24TV - E1
E1
MUH-C18TV - E1
INDOOR UNIT
3 297
450
450
352438
254
20
60
40
150 648 217
5190
995
19077550
320
1015
4holes 11✕20 Indoor unit
Installation plate
Power supply cord
Lead to right 2m
Lead to left 1m
Wall hole [75
Installation plate
Liquid line [8-0.5m
Gas line [12-0.43m
Insulation [50 O.D
[28 I.D
Insulation [28
Drain hose [16
Air out
{
Air in
Wireless remote controller
162
19
58
100mm or more
100mm or more
100mm or more
350mm or more
500mm or more
Drainage
3holes [33 Air out
Air in
Air in
Service panel
Liquid refrigerant
pipe joint
Refregerant pipe
(flared) [6.35
Gas refregerant
pipe joint
Refregerant pipe
(flared) [15.88
35-
30-
30
100
161
157
74
850
500
183
20 292
605 248
35
350
50
290 310 345
20
355
90
Drainage
hole [16.2
OB279-1.qxp 2/15/01 10:44 AM Page 9

10
100 10
1000For 10 units or less
200
Outdoor Unit-Necessary surrounding clearance
(Concentrated installation) The upper side must be open.
Outdoor Unit-Necessary surrounding clearance
200
10
10
10Note:Allow adequate
upper clearance
150
500
500 Service space
Front opening
R20
R20
25 max.
Standard bolt length
65
Front right piping holes-
detail figures
80
17
12
R6
23 33
Side air intake
724295
Outlet guide
installation hole
302
Air intake
Air intake
Air outlet
870
185 185
500
330 362 1715 39.5 27.5
Terminal block for indoor and outdoor unit connection
Handle for moving
179 524
441
445
450
468
553850
40 60524
Service panel
Refrigerant-pipe flared
connection [15.88
Refrigerant-pipe flared
connection [9.52
Knock out hole
for front piping
(refrigerant,drainage
and wiring)
42 45
104 33
Bottom
piping hole
2-U-shaped
notched
holes
Drainage hole [33
Drainage hole [33
2-12o23 Oval holes
(standard bolt M10)
Handle for moving
A
Handle
for moving
138
95 Rear piping hole
Rear fresh
air intake
A
Knock out hole
for right piping
(refrigerant,drainage
and wiring)
60
120
4553
Knock out holes for
power line 2-[27
MUH-C24TV- E1
OUTDOOR UNIT
Unit: mm
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