Mitsubishi Electric MUZ-D-NA Series User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES······································· 3
2. PART NAMES AND FUNCTIONS····················· 4
3. SPECIFICATION················································ 5
4. OUTLINES AND DIMENSIONS ························ 7
5. WIRING DIAGRAM············································ 8
6. REFRIGERANT SYSTEM DIAGRAM ··············· 9
7. SERVICE FUNCTIONS ··································· 10
8. MICROPROCESSOR CONTROL ··················· 12
9. TROUBLESHOOTING····································· 19
10. DISASSEMBLY INSTRUCTIONS···················· 32
Models
MSZ-D30NA MSZ-D30NA- 8
MSZ-D36NA MSZ-D36NA- 8
MSY-D30NA MSY-D30NA- 8
MSY-D36NA MSY-D36NA- 8
No. OBH501
REVISED EDITION-C
INDOOR UNIT
Outdoor unit service manual
MUZ-D•NA Series (OBH502)
MUY-D•NA Series (OBH502)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
PARTS CATALOG (OBB501)
Please void OBH501 REVISED EDITION-B.
Revision C:
• MSZ-D30/D36NA- 8and
MSY-D30/D36NA-
8have been added.

2
Revision A:
• 3. SPECIFICATION has been corrected.
Revision B:
• 3. SPECIFICATION has been corrected.
Powerful has been added.
Use the specified refrigerant only
Never use any refrigerant other than that specified.
Doing so may cause a burst, an explosion, or fire when the unit is being used, serviced, or disposed of.
Correct refrigerant is specified in the manuals and on the spec labels provided with our products.
We will not be held responsible for mechanical failure, system malfunction, unit breakdown or accidents caused by
failure to follow the instructions.
Revision C:
• MSZ-D30/D36NA- 8and MSY-D30/D36NA- 8have been added.

3
MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA
1. New model
MSZ-D30NA MSZ-D36NA - 8
1. Electronic control P.C. board has been changed.
MSZ-D36NA MSZ-D36NA - 8
1. Electronic control P.C. board has been changed.
MSY-D30NA MSY-D30NA - 8
1. Electronic control P.C. board has been changed.
MSY-D36NA MSY-D36NA - 8
1. Electronic control P.C. board has been changed.
TECHNICAL CHANGES
1

4
Remote controller
Operation indicator
lamp
Remote control
receiving section
Emergency operation
switch
Horizontal vane
Air outlet
Air filter
(Catechin air filter)
Air inlet
Front panel
Air cleaning filter
(Anti-Allergy Enzyme Filter)
ACCESSORIES
MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA
MSZ-D30NA
MSZ-D36NA
MSY-D30NA
MSY-D36NA
Installation plate 1
Installation plate screw 4 × 25 mm 7
Remote controller holder 1
Screw for 3.5 × 1.6 mm (Black) 2
Battery (AAA) for remote controller 2
Wireless remote controller 1
Felt tape (Used for left or left-rear piping) 2
L-Joint pipe 1
Conduit plate 1
Air cleaning filter 2
PART NAMES AND FUNCTIONS
2

5
Model MSZ-D30NA MSY-D30NA MSZ-D36NA MSY-D36NA
Power supply V, phase, Hz 208/230 , 1 , 60
Max. fuse size (time delay)/ Disconnect switch A15
Min. circuit ampacity A 1.0
Fan motor F.L.A 0.76
Airflow
Low - Med. - High
- Powerful
COOL Dry
(Wet)
CFM
389 - 639 - 848 - 887
(350 - 576 -763 - 798)
HEAT Dry 445 - 639 - 848 - 887 — 445 - 639 - 848 - 887 —
Moisture removal pt./h 9.9 11.3 11.9
Sound level
Low - Med. - High
- Powerful
Cooling
dB(A)
32 - 42 - 49 -51
Heating 34 - 42 - 49 - 50 — 34 - 42 - 49 - 50 —
Cond. drain connection O.D. in. 5/8
Dimensions
W
in.
46-1/16
D 11-5/8
H 14-3/8
Weight Ib. 40
External finish Munsell 1.0Y 9.2/0.2
Remote controller Wireless type
Control voltage (by built-in transformer) 12-24 VDC
NOTE : Test conditions are based on AHRI 210/240.
SPECIFICATION
3

6
3-1. OPERATING RANGE
(1) POWER SUPPLY
3-2. OUTLET AIR SPEED AND COVERAGE RANGE
(2) OPERATION
●The air coverage range is the figure up
to the position where the air speed is 1
ft./sec., when air is blown out horizon-
tally from the unit properly at the High
speed position.
The coverage range should be used
only as a general guideline since it var-
ies according to the size of the room
and furniture arranged inside the room.
Mode Condition
Intake air temperature (°F)
Indoor Outdoor
DB WB DB WB
Cooling
Standard temperature 80 67 95 —
Maximum temperature 90 73 115 —
Minimum temperature 67 57 14 —
Maximum humidity 78% —
Heating
Standard temperature 70 60 47 43
Maximum temperature 80 67 75 65
Minimum temperature 70 60 14 13
Model Mode Function Airlow
(CFM)
Air speed
(ft./sec.)
Coverage
range
(ft.)
MSZ-D30NA
MSZ-D36NA HEAT Dry 848 23.6 45.0
MSZ-D30NA
MSZ-D36NA
MSY-D30NA
MSY-D36NA
COOL
Dry 848 23.6 45.0
Wet 763 21.3 40.7
Rated voltage Guaranteed voltage (V)
Indoor unit
208/230 V
1 phase
60 Hz
Min. 187 208 230 Max. 253

7
Unit : inch
MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA
Wireless remote controller
Piping Insulation
Liquid line
Drain hose
Gas line
Indoor unit
Air out
Air in
45-1/2
46-1/16
14-3/8
2-15/16 33-11/16 9-1/2
2-11/16
2-3/16 20-7/8 17-11/16
Installation plate
Piping
Drain hose
Wall hole ø3
2-5/16 3/4
14-3/8
1-7/8
4-11/16
7/811-5/81-7/8
1/8
5-3/8
5-7/8
2-5/8
2-1/2
2-15/16
ø1-1/4 O.D
ø9/16 I.D
ø1-15/16 O.D
ø1-1/4 I.D
ø3/8 19-11/16
(Flared connection ø3/8)
ø5/8 16-7/8
(Joint connection ø5/8)
Joint
ø1-15/16 O.D
ø1-1/4 I.D
ø5/8
(Flared connection ø5/8)
Inslation ø 1-1/8 Connected part ø9/16 O.D
4-11/16 or more 8-11/16 or more
9-3/8 or more
4-3/16 or more
3/8 or more 2-3/16 or more
In case of left,left back,
or left under piping (using spacer) 5-1/8 or more
2-13/16 or more
14-1/2 or more
Required Space (Indoor Unit)
11-5/8 1/4
OUTLINES AND DIMENSIONS
4

8
MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA
WIRING DIAGRAM
5
MSZ-D30NA- 8MSZ-D36NA- 8MSY-D30NA- 8MSY-D36NA- 8

9
MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA
Refrigerant flow in cooling
Refrigerant flow in heating
Unit : inch
Indoor
heat
exchanger
Room temperature
thermistor
RT11
Refrigerant pipe ø5/8
(with heat insulator)
Flared connection
Indoor coil
thermistor
RT12 (Main)
Refrigerant pipe ø3/8
(with heat insulator)
Distributor
Indoor coil
thermistor
RT13 (Sub)
Strainer
Joint
Flared connection
Joint connection
REFRIGERANT SYSTEM DIAGRAM
6

10
7-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be
modified according to the number of the indoor unit.
7-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS the indoor electronic control P.C. board.
The time will be shortened as follows. (Refer to 9-7.)
Set time : 1-minute 1-second
Set time : 3-minute 3-second (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by short circuit-of JPG and JPS.)
How to set the remote controller exclusively for particular indoor unit
After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote
controller for the indoor unit.
The indoor unit will only accept the signal from the remote controller that has been assigned to the indoor unit once they are
set.
The setting will be cancelled if the breaker has turned off, or the power supply has shut down.
Please conduct the above setting once again after the power has restored.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below :
The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1.
After modification, press the RESET button.
NOTE : For modification, take out
the batteries and press
the OPERATE/STOP (ON/
OFF) button twice or 3
times at first.
After finish modification,
put back the batteries then
press the RESET button.
J2
J1
MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA
Table 1
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modification Same as at left Same as at left Same as at left
No. 2 unit — Solder J1 Same as at left Same as at left
No. 3 unit — — Solder J2 Same as at left
No. 4 unit — — — Solder both J1 and J2
SERVICE FUNCTIONS
7