Mitsubishi Electric Mr.SLIM MS24WN User manual

SERVICE MANUAL
CONTENTS
1. FEATURES·························································3
2. PART NAMES AND FUNCTIONS······················4
3. SPECIFICATION·················································6
4. DATA···································································8
5. OUTLINES AND DIMENSIONS ·······················12
6. WIRING DIAGRAM ··········································14
7. REFRIGERANT SYSTEM DIAGRAM··············15
8. MICROPROCESSOR CONTROL ····················16
9. SERVICE FUNCTIONS ····································25
10. TROUBLESHOOTING······································27
11. DISASSEMBLY INSTRUCTIONS·····················40
12. PARTS LIST······················································44
13. OPTIONAL PARTS ······················BACK COVER
Wireless type
Models
MS24WN (W) · MU24WN
The Slim Line.
From Mitsubishi Electric.
L
I
S
T
E
D
CUS
Remote
controller
TM
SPLIT-TYPE, AIR CONDITIONERS
INDOOR UNIT
Indication of model name
MS24WN
OUTDOOR UNIT
Indication of model name
MU24WN
Revision:
●PARTS LIST have been partially modified.
●Please void OB311.
No. OB311
REVISED EDITION-A
OB311--1.qxp 04.1.13 9:53 AM Page 1

Revision:
• Parts No. has been changed due to the color change of outdoor unit parts. WHITE➔NEW WHITE (Brighter)
• Capillary tube has been added to parts list.
CAPILLARY TUBE (TAPER PIPE)
[0.14X[0.09X1-31/32 E02 784 936
Part number
Part name
Model
MU24WN
Page
47
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3
FEATURES
1
“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.
LCD wireless
remote controller
MS24WN
Model 22,800 Btu/h
Cooling capacity
10.5
SEER
SWING
MS24WN
MU24WN
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4
PART NAMES AND FUNCTIONS
2
INDOOR UNIT
MS24WN
Installation plate
Installation plate fixing screw 4 x 25 mm(0.16 x 0.98 in.)
Remote controller holder
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
7
1
2
2
1
1
1
2
3
4
5
6
7
MS24WN
ACCESSORIES
Grille
Air inlet
Remote control
receiving section
Horizontal vane
Remote controller
Deodorizing filter (option)
(Gray sponge type)
Air cleaning filter (option)
(White bellows type)
Air filter
Vertical vane
Operation section
(When the grille is opened)
Display section
Operation indicator lamp
Receiving section
Emergency operation switch
Front panel
Operation Indicator
OUTDOOR UNIT
MU24WN
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5
REMOTE CONTROLLER
MS24WN
ON/OFF
TOO
COOL
PM
AM
TOO
WARM
ON/OFF
FAN
TOO
WARM TOO COOL
VANE
MODE
STOP
START
HR.
MIN.
WIDE VANE
LONG
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 button
(Horizontal vane button)
CLOCK SET button
LONG button
WIDE VANE button
(Vertical vane button)
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6
3
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) Ω
W
D
H
Liquid
Gas
Indoor
Outdoor
Height difference
Piping length
Btu/h
W
A
A
F.L.A
CFM
CFM
pt./h
dB(A)
in.
in.
in.
in.
lb.
A
A
F.L.A
R.L.A
L.R.A
dB(A)
in.
in.
in.
lb.
in.
in.
ft.
ft.
oz.
22,800
2,170
10.5 (10.5)
MS24WN
White
115V 60Hz 1[
15
1.1
0.82
431-491-565
402(346)-484(417)-565(487)
7.6
39-43-47
5/8
43-5/16
8-15/16
12-13/16
40
MU24WN
Munsell 5Y7/1
208/230V 60Hz 1[3 wires
25
22
0.87
PH33NPBT
C-R 0.84 C-S 2.09
16
58
Linear expansion valve
55
34-1/4
11-5/8
33-1/2
152
Wireless type
12V DC
Not supplied (optional parts)
3/8 (0.0285)
5/8 (0.0315)
Flared
Flared
Max. 25
Max. 50
4 Ib. 5 oz.
27.9 (MS32N1)
MS24WN
❈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
SPECIFICATION
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7
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
MS24WN MU24WN
Additional piping
Max. length : ft.
A
50
GasPiping size : in. Length of connecting pipe : in. Liquid Indoor unit Outdoor unit
Model
Gas :
Liquid : 0 0
Gas :
Liquid :16-15/16
19-11/16
[ 5/8 [ 3/8
0.0315 0.0285
MAX. REFRIGERANT PIPING LENGTH & MAX. HEIGHT DIFFERENCE
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8
DATA
4
4-1. PERFORMANCE DATA
1) COOLING CAPACITY
MS24WN MU24WN
Model Refrigerant piping length (one way)
1.0
25ft. (std.)
0.954
40ft.
0.923
50ft.
MS24WN
2) COOLING CAPACITY CORRECTIONS
Model
Indoor air Outdoor intake air DB temperature(˚F)
71
67
63
TC
27.9
26.4
24.9
SHC
13.9
16.7
19.0
TPC
1.93
1.82
1.74
TC
26.1
24.6
23.0
SHC
13.0
15.5
17.6
TPC
2.12
2.01
1.92
TC
24.5
22.8
21.4
SHC
12.2
14.4
16.4
TPC
2.28
2.17
2.07
TC
22.8
21.2
19.5
SHC
11.3
13.4
14.9
TPC
2.40
2.30
2.21
TC
21.0
19.5
17.8
SHC
10.4
12.3
13.6
TPC
2.50
2.41
2.30
IWB
(˚F)75 85 95 105 115
MS24WN
(208V/ 230V)
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.
4-2. PERFORMANCE CURVE
MS24WN
MU24WN
16
18
20
22
24
26
28
30
65 70 75 80 85 90 95 100 105 110 115
1.4
1.6
1.8
2.0
2.2
2.4
2.6
71
67
63
71
67
63
Total power consumption (kW) Total capacity ( ✕10 Btu/h)
Outdoor intake air DB temperature (°F)
Indoor intake air WB temperature (°F)
Indoor intake air WB temperature (°F)
Cooling
SHF at rating condition = 0.63
= 487CFM
= 0.16
Airflow
Bypass Factor
208V/230V
208V/230V
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9
4-3. Condensing pressure
Data is based on the condition of indoor humidity 50%.
Air flow should be set at High.
MU24WN
70 75 80 85 90 95 100 104(°F)
40
50
60
70
80
90
100
70 75 80 85 90 95 100 104(°F)
160
180
200
220
240
260
280
300
86
80
75
70
Condensing pressure
Outdoor ambient temperature
(PSIG)
86
80
75
70
Indoor DB temperature
Indoor DB temperature
(PSIG)
68
Suction pressure
Outdoor ambient temperature
68
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10
✻ Control voltage
Power supply voltage to
serial signal circuit is 12V DC.
Voltage between 11+ and 33--
on in-out terminal block will be
12V DC peak.
•Both wirings can be applied.
MS24WN INDOOR UNIT INDOOR UNIT
115V 60Hz 1[,
2wires
OUTDOOR UNIT
208/230V
60Hz 1[, 3 wires
SIGNAL WIRE
2 wires 12V DC OUTDOOR UNIT
208/230V
60Hz 1[, 3 wires
115V 60Hz 1[,
2 wires
Disconnect switch
SIGNAL WIRE
2 wires 12V DC
115V
4-4. STANDARD OPERATION DATA
MS24WN
Cooling
22,800
0.63
2.17
MS24WN
115V 60Hz 1[
0.071
0.62
MU24WN
208/230V 60Hz 1[
2.099
9.36/ 8.30
0.67/0.71
250
71
174
115
48
158
25
4 Ib. 5 oz.
80
67
51
50
1,280
487(Wet)
95
—
750/820
1,589/1,765
Capacity
SHF
Input
INDOOR UNIT MODEL
Power supply
Input
Fan motor current
OUTDOOR UNIT MODEL
Power supply
Input
Comp. current
Fan motor current
Condensing pressure
Suction pressure
Discharge temperature
Condensing temperature
Suction temperature
Comp. shell bottom temp
Ref. pipe length
Refrigerant charge (R22)
Intake air temperature
Discharge air temperature
Fan speed (High)
Airflow (High)
Intake air temperature
Fan speed
Airflow
Unit
Btu / h
—
kW
kW
A
kW
A
A
PSIG
PSIG
˚F
˚F
˚F
˚F
ft.
—
˚F
˚F
˚F
˚F
rpm
CFM
˚F
˚F
rpm
CFM
DB
WB
DB
WB
DB
WB
Item
Model
Total
Electrical
circuit
Refrigerant
circuit
Indoor
unit
Outdoor
unit
POWER SUPPLY
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