Mitsubishi Electric MS09NW*2 Operating manual

TECHNICAL & SERVICE MANUAL
DUCTLESS SPLIT-TYPE AIR CONDITIONERS
CONTENTS
1. FEATURES·························································2
2. TECHNICAL CHANGES ····································3
3. PART NAMES AND FUNCTIONS······················3
4. SPECIFICATIONS ··············································4
5. DATA···································································5
6. OUTLINES AND DIMENSIONS ·························9
7. WIRING DIAGRAM ··········································10
8. REFRIGERANT SYSTEM DIAGRAM··············11
9. TROUBLESHOOTING······································12
10. DISASSEMBLY INSTRUCTIONS·····················14
11. PARTS LIST······················································17
12. OPTIONAL PARTS···········································18
Wireless type
Models
MS09NW✕2 •MUM18NW
No.OB202
The Slim Line.
From Mitsubishi Electric.
L
I
S
T
E
D
R
NOTE:For parts list, please refer to the following manuals.
MS09NW ➝ OB192
MUM18NW
LCD Wireless
remote controller LCD Wireless
remote controller
MS09NW MS09NW
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2
1 FEATURES
This “2 to 1” Multi system consists of a single outdoor unit with two compressors that permit up to two indoor units to
be installed separate rooms, each with its own controller.
1.SPACE-SAVING LAYOUT
Two indoor units are served by a single outdoor unit whose installation requires only minimum space. This allows equipment
installed outside the house to be arranged in a neat, space-saving layout.
2.FLEXIBLE INSTALLATION OF INDOOR UNITS
Each indoor unit can be connected to piping up to 49 feet in length, providing plenty of freedom in determining the best loca-
tions for installation.
Cooling Capacity (BTU/h)
MUM18NW
LCD Wireless
remote controller LCD Wireless
remote controller
MS09NW MS09NW
1 Indoor Unit Operation
2 Indoor Unit Operatin
8,400
—
8,400
MS09NW
—
8,400
8,400
MS09NW
Operation Indoor unit
3.AUTO-RESTART FUNCTION
The auto restart function restarts the equipment when power is
restored following an outage automatically. Operation resumes
in the mode in which the equipment was running immediately
before the outage.
HIGH PERFORMANCE ROTARY COMPRESSOR
The advanced design of Mitsubishi Electric’s powerful and ener-
gyefficient rotary compressor results in lower operating costs
and longer service life.
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3
2 TECHNICAL CHANGES
3 PART NAMES AND FUNCTIONS
OUTDOOR UNIT
MUM18NW
MSM18EW ➔ MSM18NW
1. Indoor unit has been changed.
2. Outdoor unit has been changed.
3. Remove controller has been changed.
(The timer function was changed to the clock timer function.)
4. Indoor auto vave has been adopted.
5. Outdoor fan motor has been changed.
(SGW-60F-AC➔RA6W60-AA)
6. The varistor and the fuse have been added to electric circuit of the outdoor unit.
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4
4 SPECIFICATIONS
Model MSM18NW
SINGLE DOUBLE
Cooling capacity w1 BTU/h 8,400 8,400✕2
850 1,700
9.9
10.0
MS09NW✕2
White
115,60,1
15
0.5
0.37
208-265-328
177-226-279
–
5/8
32-1/16
7-3/16
10-13/16
18
Max. 49
Max. 25
Flared
Flared
3/8
1/4
Not supplied (optional parts)
12V DC
Wireless type
122
23-7/8
11-7/16 (12-5/8)
33-1/2
Capillary tube
37✕2
10✕2
C-R 0.98 C-S 2.21
KH122WES✕2
1.0 14+1314 15✕2
208/230,60,1
Munsell 5Y6.5/1
MUM18NW
w1 WPower consumption
EER (Double unit operation)
SEER (Double unit operation)
INDOOR UNIT MODEL
Extenal finish
Power Supply V, Hz, Phase
A
F.L.A
CFM
CFM
(Pints/h)
in.
in.
in.
in.
lbs.
V, Hz, Phase
A
F.L.A
Winding resistance (at 68˚F) "
Model
W
D
H
W
D
H
Dry
Wet
Liquid
Gas
Indoors
Outdoors
Height difference
Piping length
R.L.A
L.R.A
in.
in.
in.
in.
in.
ft
ft
lbs.
Max. fuse size (time delay)
Min. ampacity
Fan motor
Airflow
Lo-Me-Hi
Moisture removal
Cond. drain connection OD
Dimensions
Weight
OUTDOOR UNIT MODEL
External fnish
Power supply
Max. fuse sizu (time delay)
Min. ampacity
Fan motor
Compressor
Refrigerant control
Dimensions
Weight
REMOTE CONTROLLER
Control voltage (be built-in transformer)
REFRIGERANT PIPING
Pipe size
Connection
method
Between the
indoor &
outdoor units
Items
Notes w1. Rating conditions (cooling) — Inddor : 80˚FDB, 67˚FWB, Outdoor : 95˚FDB, 75˚FWB
Operating Range
Cooling Maximum
Maximum
Indoor air intake temperature
90˚FDB,71˚FWB
67˚FDB,57˚FWB
Outdoor air intake temperature
115˚FDB
67˚FDB
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Models
Indoor air Outdoor intake air DB temperature(˚F)
MS09NW
71
67
63
TC
10.3
9.74
9.16
SHC
5.93
6.91
7.72
TPC
0.76
0.71
0.68
TC
9.61
9.07
8.48
SHC
5.55
6.44
7.16
TPC
0.83
0.79
0.75
TC
9.03
8.4
7.9
SHC
5.21
5.95
6.66
TPC
0.89
0.85
0.81
TC
8.4
7.81
7.18
SHC
4.84
5.55
6.06
TPC
0.94
0.90
0.87
TC
7.73
7.18
6.55
SHC
4.46
5.10
5.53
TPC
0.98
0.94
0.90
IWB
(˚F)75 85 95 105 115
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.
MODEL Refrigerant piping length (one way)
MS-09NW 1.0
25ft (std)
0.954
40ft
0.927
49ft
2) COOLING CAPACITY CORRECTIONS
5
5 DATA
1.PERFORMANCE DATE (ONE INDOOR UNIT WITH ONE OUTDOOR UNIT)
MS09NW✕2
MUM18NW
65
0.6
0.8
1.0
1.2
6
8
10
12
75 85 95 105 115
Outdoor intake air DB temperature (-F)
Total power consumption (kW) Total capacity (o 103Btu/h)
Cooling capacity
SHF at rating condition = 0.71
Airflow = 279CFM
Bypass Factor = 0.24
Indoor intake air WB temperature (-F)
Indoor intake air WB temperature (-F)
63
67
71
63
67
71
1.PERFORMANCE CURVE (ONE INDOOR UNIT WITH ONE OUTDOOR UNIT)
NOTE : Apoint on the curve shows the reference point.
MS09NW
MUM18NW
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6
3.CONDENSING PRESSURE AND SUCTION PRESURE
(ONE INDOOR UNIT WITH ONE OUTDOOR UNIT)
Data is based on the condition of indoor humidity 50%. Air flow should be set at HI. A point on the corve shows the reference
point.
MS09NW
MUM18NW
68
40
50
60
70
80
90
100
(PSIG)
70
Outdoor ambient temperature
75 80 85 90 95 100 104-F
Suction pressure
70
86-F
80
75
Indoor DB temperature
68
170
180
200
220
240
260
280
300
(PSIG)
70 Outdoor ambient temperature 75 80 85 90 95 100 104-F
70
75
80
86-F
Condensing pressure
Indoor DB temperature
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7
Model
Unit Single Double
MSM18NW
8,400 8,400✕2
0.71 0.71
0.85 1.70
0.815 1.63
6.64 7.16✕2
260 270
75 75
194 191
116 118
64 54
60 60
57 57
Cooling
MS09NW
115.60.1
0.035✕2
0.34✕2
MUM18NW
208/230.60.1(3-wire)
1.0
172
25✕2
1lds 14oz✕2
80
67
1,230
279
95
—
900
1,150
Btu/h
—
kW
kW
A
kW
A
A
psi.G
psi.G
˚F
˚F
˚F
˚F
ft
—
˚FDB
WB
DB
WB
DB
WB
˚F
˚F
˚F
rpm
CFM
˚F
˚F
rpm
CFM
Item
Capacity
SHF
Input
Indoor unit model
Power supply (V,Hz,{)
Input
Fan current
Outdoor unit model
Power supply (V,Hz,{)
Input
Comp. current
Fan current
Condensing pressure
Suction pressure
Discharge temperature
Condensing temperature
Suction temperature
Comp. shell bottom temp.
Ref. pipe length
Refrigerant charge
Intake air
temperature
Discharge
air temperature
Fan speed
Airflow (Hi)
Intake air
temperature
Fan speed
Airflow
Total
Electrical
circuit
Refrigerant
circuit
Indoor side
Outdoor side
INDOOR UNIT
115V, 60Hz, 1[
POWER SUPPLY
INDOOR UNIT
OUTDOOR UNIT
115V, 60Hz, 1[
115V
commom Field installed
SIGNAL WIRE 2 wire DC12V
208/230V, 60Hz, 1[ 3wire
230V
115V
3.POWER SUPPLY
MSM18NW
2.STANDARD OPERATION DATA
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8
4.OPERATING RANGE
(1)POWER SUPPLY
(2)OPERATION
5.ADDITIONAL REFRIGERANT CHARGE (R-22(oz))
Indoor unit 115V 60Hz 1[
208/230V 60Hz 1[
(3wires) Min. 198V 208V 230V Max. 253V
Min. 103v—Max. 127V
Outdoor unit
MS09NW
MUM18NW
Models Rating Guaranteed Voltage
Function
Cooling
Indoor Outdoor
78% –
DB (˚F)
80
95
67
Standard temperature
Maximum temperature
Minimum temperature
Maximum humidity
WB (˚F)
67
71
57
DB (˚F)
95
115
67
WB (˚F)
–
–
–
Intake air
temperature
Condition
Model Outdoor unit precharged
(up to 25ft)
Refrigerant piping length (one way)
MS09NW✕2
MUM18NW 1 Ibs 14 oz ✕2
25ft 30ft 33ft 40ft 45ft 49ft
011223
6.MAX. REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE
MSM18NW
Indoor unit A
MS09NW
Max. Length
49ft ❋Max. Height
difference 25ft
Indoor unit B
MS09NW
Outdoor unit
MUM18NW
Max. Length
49ft
7.PIPING PREPARATION
1Table below shows the specifications of pipes commercially available.
2Ensure that the 2 refrigerant pipes are well insulated to prevent condensation.
3Refrigerant bending radius must be 10cm or more.
Outside diameter Insulation
UNIT No. Pipe inch thickness(in) Insulation material
and UNIT For liquid 1/4 1/4 Heat resisting foam plastic
For gas 3/8 1/4 0.045 specific gravity
BA
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9
6 OUTLINES AND DIMENSIONS
MODEL : MUM18NW
OUTDOOR UNIT
REAR VIEW
Unit center
Refrigerant
pipe(Flared)
{3/8
Refrigerant
pipe(Flared)
{1/4 7/8
Wiring hole
{3-7/8
NOTE : The symbol { indicates diameter.
12-1/4
13-1/2
11-7/16
1-3/16 1-3/16 2-3/8
5-1/433-1/2
1/4
1-3/16
12-7/8
5-1/8
10-1/8
8
5-13/16
2 2
19-11/16
Unit
center
12-5/16
23-7/8 6-5/8
3-5/8
4 Drain holes [5/8
Air in
Air in
Air out
2-1/4 1-3/8 4 Installation anchor holes
3/8✕13/16
8-3/4 8-3/4
1-1/8
7/8
1-1/4
REQUIRED SPACE
Space for
servicing
4 in. or more
4 in. or more
36 in. or more
4 in. or more
38 in. or more
16 in. or more
[17
Unit : inch
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10
7WIRING DIAGRAM
OUTDOOR
MODEL MUM18NW WIRING DIAGRAM
FNR
115V
34
BLK
BRN 2
1BLU
GRY
N
❈
❈
❈BLK
ORN
YLW
X2 X1 2
2
6
644
YLW
BLU
L2 BLU
RED
TB3
TO INDOOR
UNIT No.B
CONNECTING
WIRES
DC12V 2
52
C2
GRY
VLT
2
1
TO INDOOR
UNIT No.A
CONNECTING
WIRES
DC12V 2
1
52
C1
ORN
BRN
2
1
TB2
X2
X15
5
3
3WHT
RED
RED
GROUND
C3
7
7
8
8
X1
X2
52C1
52C2
4 3
BLK
TB1
L1
115V
POWER
SUPPLY
208/230V
1phase
3wires
60Hz
YLW
GRY NR F
GRY
WHT WHT
BLK
BRN
2
1
2
1
BLK
RED
WHT
2
1
S
MC1
MC2
MF
51C1
C1
BLK
WHT
BLK
BLK
RED
WHT
BLK
RED
BLK
GRY
1
5
4
3
YLW
ORN
RED
YLW
BLK
WHT
ORN
R
R
S
C
C
1
1
2
2
C2
51C2
❈
❈
❈
❈
1.Slide the sleeve.
2.Pull the wire while
pushing the locking
lever.
NOTE:1. Use copper conductors only (For field wiring).
2. Symbols below indicate.
: Terminal block, : Connector
3. “❈”shows the terminals with a lock mechanism, so they cannot be removed when you pull
the lead wire.
Be sure to pull the wire by pushing the locking lever (projected part) of the terminal with a finger.
SYMBOL NAME SYMBOL NAME SYMBOL NAME
C1,2
COMPRESSOR CAPACITOR MF FAN MOTOR(INNER THERMOSTAT) 51C1,2 OVERCURRENT RELAY
C3 FAN MOTOR CAPACITOR NR VARISTOR 52C1,2 COMPRESSOR CONTACTOR
F FUSE(3.0A) TB1~3 TERMINAL BLOCK
MC1,2 COMPRESSOR X1,2 FAN MOTOR RELAY
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11
8REFRIGERANT SYSTEM DIAGRAM
MS09NW✕2/MUM18NW Unit : inch
Indoor unit Outdoor unit
Indoor heat
exchanger Indoor coil
thermistor
RT12
Room
temperature
thermistor
RT11
Flared
connection
Flared
connection
Refrigerant pipe [1/4
(Option)
(with heat insulator)
Ball valve
with service port
Refrigerant pipe [3/8
(Option)
(with heat insulator)
Ball valve Service
port
Service
port
Accumulator Muffler
Fusible
plug Compressor
OD0.12oID0.055o23-5/8
Capillary tube Strainer
Indoor heat
exchanger Indoor coil
thermistor
RT12
Room
temperature
thermistor
RT11
Flared
connection
Flared
connection
Refrigerant pipe [1/4
(Option)
(with heat insulator)
Ball valve
with service port
Refrigerant pipe [3/8(Option)
(with heat insulator)
Ball valve Service
port
Service
port
Accumulator Muffler
Fusible
plug Compressor
OD0.12oID0.055o23-5/8
Capillary tube Strainer
Flow of refrigerant
Outdoor
heat
exchanger
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12
9 TROUBLESHOOTING
MUM18NW
9-1 Cautions on troubleshooting
9-1-1 Before troubleshooting, check the followings:
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for mis-wiring.
9-1-2 Take care the followings during servicing.
1) Befor servicing the air conditioner, be sure to first turn off the remote controller to stop the main unit, and then after
confirming the horizontal vane is closed, disconnect the breaker.
2) When removing the P.C. board, hold the edge of the board with care NOT to apply stress on the components.
3) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Measure the resistance between the terminals with a tester.
(Coil wiring temperature-10¡C ~ 40¡C)
Measure the resistance between the terminals with a tester.
(Coil wiring temperature-10¡C ~ 40¡C)
Part name
Compressor
Outdoor fan
motor
Check method and criterion Figure
Normal
0.86~1.06'Opened or
short-circuited
C-R
C-S 1.94~2.39'
Abnormal
Normal
17.6~21.6'Opened or
short-circuited
WHT-BLK
BLK-YLW
YLW-RED 9.1~11.3' 9.1~11.3'
Abnormal

BLK REDYLW ORN WHT
P
9-2 Trouble criterion of main parts
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13
Compressor and outdoor fan do not operate.(Only indoor fan operates.)
Check of outdoor unit
Press EMERGENCY ON/OFF button.
3-minute time delay works.
Test mode operates for 30 minutes.
Check the outdoor fan motor , compressor , relay ,
contactor , and wiring.
Turn on outdoor power supply.
No
No
Check the indoor, outdoor connection.
Check voltage to terminal block of outdoor unit. Is
there 115V AC to terminal block between - ,
- ?
Check voltage to terminal block of outdoor unit. Is
there DC12V to terminal block between 22- 11?
Yes
Yes
Start
Check voltage to terminal block of indoor unit. Is
there DC12V to terminal block between 22- 11?No
Yes
Check the indooor electronic control
P.C.board and wiring.
L1
N
L2
N
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14
10 DISASSEMBLY INSTRUCTIONS
OUTDOOR UNIT MUM18NW
1. Removing of the cabinet
(1)Remove the set screws of the valve cover to remove
the valve cover as shown in Photo 2.
(2)Remove the set screws of the side panel to remove
the side panel and cabinet.
2. Removing the propeller
(1)Remove the propeller nut.
(2)Loosen the propeller in the rotating direction.
(3)Pull the propeller forward.
Note:
●To set the propeller, fit the cut on the shaft to the
mark on the propeller.
OPERATING PROCEDURE PHOTOS
Photo 1
Photo 2
Photo 4
Photo 3
Screws
Screws
Screws
Screw
Propeller
Nut
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15
OPERATING PROCEDURE PHOTOS
Photo 5
Photo 6
3. Removing the outdoor fan motor.
(1) Remove the cabinet. (Refer to 1)
(2) Remove the propeller. (Refer to 2)
(3) Disconnect the connector remove the clamp of out-
door fan
motor lead wire.
(4) Remove the screws fixing the outdoor fan motor.
Set screws of the relay panel
Clamp Connector
Screws
Clamp
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16
OPERATING PROCEDURE PHOTOS
Photo 7
Photo 8
4. Removing the compressor
(1)Disconnect the cord connector. (See Phot 5)
(2)Remove the set screws of the relay panel.
(3)Remove the set nuts of the terminal cover.
(4)Pull up the compressor.
(5)Pull out the lead wires from the compressor terminal
to remove overcurrent relay.
(6)Remove set nuts of the compressor base.
(7)Remove the low pressure side welded part and high
pressure side welded part using a burner.
Note:
●Before using a welder, release gas inside the unit and
make sure that the gauge pressure shows 0 kg/f.
●During welding, open the charge plug because
pressure rises due to expansion by heat
Set nuts of the terminal cover
Nuts Nuts
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17
11 PARTS LIST
OUTDOOR UNIT PARTS
MUM18NW
Refer to MS09EW for indoor unit.
No. Parts No. RemarksParts Name Symbol
in
Wiring
Diagram
Q,ty/unit
MUM18NW
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
T2W 382 342
T2W 462 232
T2W 667 249
T2W 739 245
T2W 466 509
T2W A75 301
R01 093 115
T2W 903 353
T2W 466 342
T2W E47 378
T2W 464 340
T2W 466 350
T2W 466 630
M21 B90 641
T2W 416 642
T2W 460 662
T2W 460 661
T92 513 200
T2W 739 246
M21 B93 936
T2W E42 375
M21 020 378
T2W 739 290
T2W A96 641
CONTACTOR G4F11123T-M
252C1,52C2
MF
C1,C2
X1,X2
TB1
51C1,51C2
C3
MC1,MC2
TB2,3
1
1
1
1
1
1
2
2
1
2
1
1
2
2
1
1
1
1
2
1
1
1
2
55+ 220V
8+ 220V
8+ 220V
"0.12✕"0.055✕43-5/16
CABINET
SIDE PANEL
SERVICE PANEL
OUTDOOR NOZZLE
OUTDOOR FAN MOTOR
PROPELLER
COMPRESSOR CAPACITOR
OUTDOOR FAN RELAY
OUTDOOR TERMINAL BLOCK
OVERCURRENT RELAY
OUTDOOR FAN CAPACITOR
OUTDOOR HEAT EXCHANGER
CHARGE PLUG
FUSIBLE PLUG
VALVE (LIQUID) 1/4
VALVE (GAS) 3/8
COMPRESSOR
VALVE COVER
CAPILLARY TUBE
TERMINAL BLOCK
TERMINAL BLOCK
BASE ASSEMBLY
CHARGE PLUG
RA6W60-
When servicing, cut the tube to the proper length as shown in the REFRIGERANT SYSTEM DIAGRAM see page 11.
Part number that are circled is not shown in the illustration.
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18
12 OPTIONAL PARTS
10ft
16ft
23ft
33ft
3/8 1/4 C 13/16
D 1-1/16
MAC - 440PI
MAC - 441PI
MAC - 442PI
MAC - 443PI
MS09NW 0
1
Pipe length Cross-section Part No.Model A-Gas B-Liquid
Pipe size O.D Insulation Additional
refrigerant
charge
R-22(Oz)
1. REFRIGERANT PIPES
The air conditioner has flared connections its indoor and outdoor sides.
Please use the optional extension pipe as follows.
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OB202-1.qxp 26/9/97 11:08 AM Page 19

New publication, effective Sep. 1997.
Specifications subject to change without notice.
The Slim Line.
From Mitsubishi Electric.
L
I
S
T
E
D
R
CCopyright 1997 MITSUBISHI ELECTRIC ENGINEERING CO.,LTD.
Issued in Sep. 1997 NO.OB202 5011
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