Mitsubishi Electric Mr. Slim MS09TW User manual

SERVICE MANUAL
SPLIT-TYPE AIR CONDITIONERS
CONTENTS
1. FEATURES ············································OB274-2
2.TECHNICAL CHANGES························OB274-3
3. PART NAMES AND FUNCTIONS ········OB274-4
4. SPECIFICATIONS··································OB274-7
5. DATA ····················································OB274-10
6. OUTLINES AND DIMENSIONS ··········OB274-16
7.WIRING DIAGRAM ······························OB274-18
8. REFRIGERANT SYSTEM DIAGRAM··OB274-21
9. MICROPROCESSOR CONTROL········OB274-23
10. SERVICE FUNCTIONS ························OB274-31
11.TROUBLESHOOTING··························OB274-33
12. DISASSEMBLY INSTRUCTIONS ········OB274-42
13. PARTS LIST ········································OB274-51
14. OPTIONAL PARTS ······························OB274-57
Wireless type
Models
MS09TW(W) · MU09TW
MS12TN (W) · MU12TN
MS15TN (W) · MU15TN
MS17TN (W) · MU17TN
No. OB274
The Slim Line.
From Mitsubishi Electric.
L
I
S
T
E
D
R
L
I
S
T
E
D
R
C
MS12TN
MS15TN
MS17TN
INDOOR UNIT
MU15TN
MU17TN
OUTDOOR UNIT
Remote
controller
TM

FEATURES
OB274-2
1
MS12TN 
MS15TN 
MS17TN
MS09TW MU09TW

MU12TN
MU15TN 
MU17TN
LCD wireless 
remote controller
Models Cooling capacity SEER
MS09TW 8,500Btu/h 10.2
MS12TN 12,300/12,600Btu/h 11.3/11.3
MS15TN 14,300/14,600Btu/h 10.5/10.5
MS17TN 15,900/16,100Btu/h 10.2/10.2
“I FEEL CONTROL” IN OUR LCD WIRELESS REMOTE CONTROLLER WITH ON/OFF PROGRAM TIMER
Mitsubishi Electric’s new wireless remote controller incorporates a number of advanced features that provide even greater con-
trol and ease-to-use. It has a liquid crystal display which indicates such information as mode, fan speed and temperature
selected as well as the programmed ON/OFF timer. It is also equipped with “I Feel Control”, a unique Mitsubishi Electric fea-
ture that allows the user to adjust the temperature to exactly the level he or she wants simply by tapping the button that
describes present conditions : “Too Cool” or “Too Warm”. The optimum temperature set this way is then memorized for immedi-
ate recall whenever the air conditioner is used again.
Select desired air flow direction.
REMOTE-CONTROL OPERATION MODE
Using the remote controller, you can select from five airflow set-
tings to match room layout and the location of people. Also, you
can set the vane to swing automatically.
SWING
AUTO-RESTART FUNCTION
The auto restart function restarts the equipment automatically
when power is restored following an outage. Operation resumes in
the mode in which the equipment was running just before the out-
age.
HIGH PERFORMANCE ROTARY COMPRESSOR
The advanced design of Mitsubishi Electric’s powerful and energy
efficient rotary compressor results in lower operating costs and
longer service life.

OB274-3
TECHNICAL CHANGES
2
MS09NW2 ➔ MS09TW
1. Indoor unit has changed
2. Remote controller has changed.
MS12NN2 ➔ MS12TN
1. Remote controller has changed.
2. Union size of connect pipe for gas has changed.
MS15NN2 ➔ MS15TN
MS17NN2 ➔ MS17TN
1. Remote controller has changed.
MU09NW2 ➔ MU09TW
1. Outdoor unit has changed.
MU12NN2 ➔ MU12TN
1. Outdoor unit has changed.
MU15NN2 ➔ MU15TN
MU17NN2 ➔ MU17TN
1. Only model name has changed.

PART NAMES AND FUNCTIONS
OB274-4
3
INDOOR UNIT
MS09TW
Operation section

Emergency operation switch
Horizontal vane
Air filter
Deodorizing filter(option) 
(gray sponge type)
Vertical vanes
Air inlet
Grille
Remote control 
receiving section
Remote controller
Air cleaning filter(option) 
(white bellows type)
Front panel
Emergency operation switch Operation indicator lamp
Receiving section
(When the front panel is opened)
MS09TW MS09TW
MS12TN
MS15TN
MS17TN
MS12TN
MS15TN
MS17TN
MS12TN
MS15TN
MS17TN
Installation plate 
Installation plate fixing screw 4 x 25 mm(0.16 x 0.98 in.) 
Remote controller mounting hardware 
Fixing screw for 33.5 x 16 mm(0.14 x 0.63 in.) (Black) 
Battery (AAA) for remote controller 
Wireless remote controller 
Felt tape (Used for left or left-rear piping) 

1 
5 
1 
2 
2 
1 
1
1
2
3
4
5
6
7
MS12TN 
MS15TN 
MS17TN
MS09TW
1 
6 
1 
2 
2 
1 
1
ACCESSORIES

OB274-5
Air inlet 
(back and side)
Air outlet
Air inlet
Piping
Drain hose
Air outlet
Drain outlet
(back and side)
OUTDOOR UNIT
MU15TN
MU17TN
MU09TW
MU12TN

OB274-6
MS09TW
MS12TN
MS15TN
MS17TN
REMOTE CONTROLLER
ON/OFF
TOO 
COOL
PM
AM
TOO 
WARM
ON/OFF
FAN
TOO 
WARM TOO

COOL
VANE
MODE
STOP
START
HR.
MIN.
I FEEL COOL
DRY
PM
CLOCK
AM
RESET CLOCK
FAN
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 VANE CONTROL button
CLOCK SET button

OB274-7
4
Notes :Test conditions are based on ARI 210/240
❈1 : Rating conditions (cooling) — Indoor : 80-FDB, 67-FWB, Outdoor : 95-FDB, (75-FWB)
❈2 : Rating conditions (cooling) — Indoor : 80-FDB, 67-FWB, Outdoor : 82-FDB, 65-FWB
Operating Range
Item Model
Cooling capacity 
Power consumption 
EER [SEER] 
INDOOR UNIT MODEL 
External finish 
Power supply 
Max. fuse size (time delay)/ Disconnect switch 
Min. ampacity 
Fan motor 
Airflow Low—Med.—High


Moisture removal 
Sound level Low-Med.-High 
Cond. drain connection O.D. 

Dimensions 

Weight 
OUTDOOR UNIT MODEL 
External finish 
Power supply 
Max. fuse size (time delay) 
Min. ampacity 
Fan motor 


Compressor


Refrigerant control 
Sound level 

Dimensions 

Weight 
REMOTE CONTROLLER 
Control voltage (by built-in transformer) 
REFRIGERANT PIPING 
Pipe size 
(Min. wall thickness) 
Connection method


Between the indoor 
& outdoor units 
Refrigerant charge (R22) 
Refrigerant oil (Model)









FAN Dry 
COOL Dry(Wet) 



W 
D 
H 







Model 
Winding resistance (at 68˚F)"




W 
D 
H 




Liquid 
Gas 
Indoor 
Outdoor 
Height difference 
Piping length
Btu/h 
W 



V, phase, Hz 
A 
A 
F.L.A 
CFM 
CFM 
pt./h 
dB(A) 
in. 
in. 
in. 
in. 
lb. 


V, phase, Hz 
A 
A 
F.L.A 


R.L.A 
L.R.A 

dB(A) 
in. 
in. 
in. 
lb. 



in. 
in. 


ft. 
ft. 

oz.
8,500 
840 
10.1 [10.2] 
MS09TW 



0.5 
0.37 
191-237-289 
166(138)-219(184)-272(226) 
2.3 
26-31-36 

33-1/2 
7-1/2 
10-15/16 
20 
MU09TW 

115, 1, 60 

11 
0.60 
RH130WGJT 
C-R 0.85 C-S 1.21 
7.8 
41.0 

46 
30-23/32 
10-1/32 
21-1/4 
71 




3/8 (0.0285) 




1 Ib. 11 oz. 
9.3 (MS56)




White 
115, 1, 60 
15 






5/8 





Munsell 5Y7/1 

15 






Capillary tube 





Wireless type 
12V DC 
Not supplied (optional parts) 
1/4 (0.0265) 

Flared 
Flared 
Max. 25 
Max. 49
12,300/12,600 
1,100/1,130 
11.2/11.2 [11.3/11.3] 
MS12TN 



0.6 
0.43 
360-395-452 
360(314)-395(342)-452(392) 
3.2 
36-39-42 

39-15/16 
7-1/2 
12-5/8 
31 
MU12TN 

208/230, 1, 60 

12 
0.42 
RH167NHDT 
C-R 2.16 C-S 3.11 
9.0 
29.0 

49 
30-3/4 
10-1/16 
21-1/4 
84 




1/2 (0.0285) 




2 Ib. 9 oz. 
16.1 (MS56)
MS09TW MS12TN
❈1
❈1
❈1❈2

Cooling

Maximum 
Minimum
Indoor intake air temperature 
95-FDB, 71-FWB 
67-FDB, 57-FWB
Outdoor intake air temperature 
115-FDB 
67-FDB
SPECIFICATIONS

OB274-8
Item Model
Cooling capacity
Power consumption
EER [SEER] 
INDOOR UNIT MODEL 
External finish 
Power supply 
Max. fuse size (time delay)/Disconnect switch 
Min. ampacity 
Fan motor 
Airflow Low—Med.—High


Moisture removal 
Sound level Low-Med.-High 
Cond. drain connection O.D. 

Dimensions 

Weight 
OUTDOOR UNIT 
External finish 
Power supply 
Max. fuse size (time delay) 
Min. ampacity 
Fan motor 


Compressor


Refrigerant control 
Sound level 

Dimensions 

Weight 
REMOTE CONTROLLER 
Control voltage (by built-in transformer) 
REFRIGERANT PIPING 
Pipe size 
(Min. wall thickness) 
Connection method


Between the indoor 
& outdoor units 
Refrigerant charge (R22) 
Refrigerant oil (Model)









Dry 
Wet 



W 
D 
H 







Model 
Winding resistance (at 68˚F)"




W 
D 
H 




Liquid 
Gas 
Indoor 
Outdoor 
Height difference 
Piping length
Btu/h 
W 



V, phase, Hz 
A 
A 
F.L.A 
CFM 
CFM 
pt./h 
dB(A) 
in. 
in. 
in. 
in. 
lb. 


V, phase, Hz 
A 
A 
F.L.A 


R.L.A 
L.R.A 

dB(A) 
in. 
in. 
in. 
lb. 



in. 
in. 


ft. 
ft. 

oz.
14,300/14,600 
1,370/1,400 
10.4/10.4 (10.5/10.5) 
MS15TN 



0.6 
0.43 
360-395-452 
293-321-367 
4.7 
36-39-42 





MU15TN 



14 

RH207NHDT 
C-R 1.68 C-S 2.78 
10.0 
35.0 

52 



92 









2 Ib. 14 oz. 







White 
115, 1, 60 
15 






5/8 
39-15/16 
7-1/2 
12-5/8 
31 

Munsell 5Y7/1 
208/230, 1, 60 
20 

0.52 




Capillary tube 

33-7/16 
11-7/16 
23-13/16 

Wireless type 
12V DC 
Not supplied (optional parts) 
1/4 (0.0265) 
5/8 (0.0315) 
Flared 
Flared 
Max. 25 
Max. 49 

16.1 (MS56) 

15,900/16,100 
1,570/1,600 
10.1/10.1 (10.2/10.2) 
MS17TN 



0.7 
0.51 
406-441-491 
346-374-417 
5.1 
40-43-45 





MU17TN 



15 

RH231NHDT 
C-R 1.65 C-S 2.67 
11.0 
38.0 

52 



97 









3 Ib. 



MS15TN MS17TN
❈1
❈1
❈1❈2

Cooling

Maximum 
Minimum
Indoor intake air temperature 
95-FDB, 71-FWB 
67-FDB, 57-FWB
Outdoor intake air temperature 
115-FDB 
67-FDB
Notes :Test conditions are based on ARI 210/240
❈1 : Rating conditions (cooling) — Indoor : 80-FDB, 67-FWB, Outdoor : 95-FDB, (75-FWB)
❈2 : Rating conditions (cooling) — Indoor : 80-FDB, 67-FWB, Outdoor : 82-FDB, 65-FWB
Operating Range

OB274-9
wHeight difference 
 should be within 
 25ft regardless of 
 which unit, indoor 
 or outdoor 
 position is high.
wMax. Height 
 difference 25ft Additional Piping

Max. length 
 A
Indoor 
unit
Outdoor unit
MAX. HEIGHT DIFFERENCE
Outside 
diameter Minimum

Wall 
thickness Outside

diameter Minimum

Wall 
thickness
Model Additional piping

Max. length : ft. 
A 




49

GasPiping size : in. Length of connecting pipe : in.

Liquid Indoor unit Outdoor unit
Gas : 

Liquid :
0 

0
Gas : 

Liquid :
16-15/16 

19-11/16
[ 3/8 
[ 1/2
[ 5/8
[ 1/4
0.0285



0.0315
0.0265

MS09TW 
MU09TW 
MS12TN 
MU12TN 
MS15TN 
MU15TN 
MS17TN 
MU17TN
MAX. REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE

OB274-10
DATA
5
Model
Indoor air Outdoor intake air DB temperature (˚F)
71 
67 
63 
71 
67 
63 
71 
67 
63 


TC 
15.1 
14.3 
13.4 
17.5 
16.6 
15.6 
19.5 
18.4 
17.3
SHC 
8.7 
10.1 
11.3 
9.1 
10.8 
12.2 
10.1 
12.0 
13.6
TPC 
0.98 
0.92 
0.88 
1.22 
1.15 
1.10 
1.40 
1.32 
1.26
TC 
14.1 
13.3 
12.4 
16.4 
15.4 
14.4 
18.2 
17.2 
16.1
SHC 
8.1 
9.4 
10.5 
8.5 
10.0 
11.3 
9.4 
11.2 
12.6
TPC 
1.07 
1.02 
0.97 
1.34 
1.27 
1.21 
1.53 
1.45 
1.39 

TC 
13.2 
12.3 
11.6 
15.4 
14.3 
13.4 
17.1 
15.9 
14.9 


SHC 
7.6 
8.7 
9.8 
7.9 
9.3 
10.5 
8.8 
10.3 
11.7 

TPC 
1.16 
1.10 
1.05 
1.44 
1.37 
1.31 
1.65 
1.57 
1.50
TC 
12.3 
11.4 
10.5 
14.3 
13.3 
12.2 
15.9 
14.8 
13.6 

SHC 
7.1 
8.1 
8.9 
7.4 
8.6 
9.6 
8.2 
9.6 
10.6
TPC 
1.22 
1.17 
1.12 
1.51 
1.45 
1.40 
1.73 
1.66 
1.60
TC 
11.3 
10.5 
9.6 
13.2 
12.2 
11.2 
14.6 
13.6 
12.4
SHC 
6.5 
7.5 
8.1 
6.8 
7.9 
8.7 
7.6 
8.8 
9.7
TPC 
1.27 
1.22 
1.17 
1.58 
1.52 
1.45 
1.81 
1.74 
1.66
IWB 
(˚F) 

75 85 95 105 115
MS12TN
MS15TN
MS17TN
Model Refrigerant piping length (one way)
MS09TW 
MS12TN 
MS15TN 
MS17TN

1.0 

25ft (std)

0.954 

40ft

0.927 

49ft
MS09TW MS12TN MS15TN MS17TN MU09TW MU12TN MU15TN MU17TN
Model
Indoor air Outdoor intake air DB temperature (˚F)
MS09TW
71 
67 
63 

TC 
10.4 
9.9 
9.3
SHC 
5.9 
6.9 
7.7
TPC 
0.75 
0.71 
0.67
TC 
9.7 
9.2 
8.6 

SHC 
5.5 
6.4 
7.2
TPC 
0.82 
0.78 
0.74
TC 
9.1 
8.5 
8.0
SHC 
5.2 
6.0 
6.7
TPC 
0.88 
0.84 
0.80
TC 
8.5 
7.9 
7.3
SHC 
4.8 
5.5 
6.1
TPC 
0.93 
0.89 
0.86 

TC 
7.8 
7.3 
6.6 

SHC 
4.4 
5.1 
5.5
TPC 
0.97 
0.93 
0.89
IWB 
(˚F) 

75 85 95 105 115
(208V)
(115V)
Model
Indoor air Outdoor intake air DB temperature (˚F)
71 
67 
63 
71 
67 
63 
71 
67 
63 


TC 
15.4 
14.6 
13.7 
17.9 
16.9 
15.9 
19.7 
18.7 
17.5
SHC 
8.9 
10.4 
11.6 
9.2 
11.0 
12.5 
10.2 
12.1 
13.7 

TPC 
1.01 
0.95 
0.90 
1.25 
1.18 
1.12 
1.42 
1.34 
1.28
TC 
14.4 
13.6 
12.7 
16.7 
15.8 
14.7 
18.4 
17.4 
16.3
SHC 
8.3 
9.7 
10.7 
8.6 
10.2 
11.6 
9.5 
11.3 
12.7
TPC 
1.10 
1.05 
1.00 
1.37 
1.30 
1.24 
1.56 
1.48 
1.42
TC 
13.5 
12.6 
11.8 
15.7 
14.6 
13.7 
17.3 
16.1 
15.1
SHC 
7.8 
8.9 
10.0 
8.1 
9.5 
10.8 
8.9 
10.5 
11.9
TPC 
1.19 
1.13 
1.08 
1.47 
1.40 
1.34 
1.68 
1.60 
1.53
TC 
12.6 
11.7 
10.8 
14.6 
13.6 
12.5 
16.1 
15.0 
13.8
SHC 
7.3 
8.3 
9.1 
7.5 
8.8 
9.8 
8.3 
9.7 
10.8
TPC 
1.25 
1.20 
1.15 
1.55 
1.48 
1.43 
1.77 
1.70 
1.63
TC 
11.6 
10.8 
9.8 
13.4 
12.5 
11.4 
14.8 
13.8 
12.6
SHC 
6.7 
7.6 
8.3 
6.9 
8.1 
8.9 
7.7 
8.9 
9.8
TPC 
1.30 
1.25 
1.20 
1.61 
1.55 
1.48 
1.84 
1.78 
1.70
IWB 
(˚F) 

75 85 95 105 115
MS12TN
MS15TN
MS17TN
Notes 1.IWB : Intake air wet-bulb temperature. 
TC :Total Capacity (x103 Btu/h), SHC : Sensible Heat Capacity (x103 Btu/h)

TPC :Total Power Consumption (kW) 
2.SHC is based on 80˚F  of indoor intake air DB temperature.
(230V)
5-1. PERFORMANCE DATA
1) COOLING CAPACITY
2) COOLING CAPACITY CORRECTIONS