Mitsubishi Electric MSZ-D30NA 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-D
INDOOR UNIT
Outdoor unit service manual
MUZ-D•NA Series (OBH502)
MUY-D•NA Series (OBH502)
PARTS CATALOG (OBB501)
OBH501 REVISED EDITION-C is void.
Revision D:
• 9-7. TEST POINT DIAGRAM AND
VOLTAGE has been modied.

2
Revision C:
• MSZ-D30/D36NA- 8and MSY-D30/D36NA- 8have been added.
Revision A:
• 3. SPECIFICATION has been corrected.
Revision B:
• 3. SPECIFICATION has been corrected.
Powerful has been added.
Revision D:
• 9-7. TEST POINT DIAGRAM AND VOLTAGE has been modied.
Use the specied 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.
<Preparation before the repair service>
Prepare the proper tools.
Prepare the proper protectors.
Provide adequate ventilation.
After stopping the operation of the air conditioner, turn off the power-supply breaker and pull the power plug.
Discharge the capacitor before the work involving the electric parts.
<Precautions during the repair service>
Do not perform the work involving the electric parts with wet hands.
Do not pour water into the electric parts.
Do not touch the refrigerant.
Do not touch the hot or cold areas in the refrigeration cycle.
When the repair or the inspection of the circuit needs to be done without turning off the power, exercise great caution not to
touch the live parts.
WARNING
• When the refrigeration circuit has a leak, do not execute pump down with the compressor.
• When pumping down the refrigerant, stop the compressor before disconnecting the refrigerant pipes.
The compressor may burst if air etc. get into it.
• When opening or closing the valve below freezing temperatures, refrigerant may spurt out from the gap
between the valve stem and the valve body, resulting in injuries.
OBH501D

3
TECHNICAL CHANGES1
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.
OBH501D

4
2 PART NAMES AND FUNCTIONS
ACCESSORIES
MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA
Model
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 lter 2
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)
OBH501D

5
SPECIFICATION3
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 A 15
Min. circuit ampacity A 1.0
Fan motor F.L.A 0.76
Airow
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 nish Munsell 1.0Y 9.2/0.2
Remote controller Wireless type
Control voltage (by built-in transformer) 12-24 V DC
NOTE : Test conditions are based on AHRI 210/240.
OBH501D

6
3-1. OPERATING RANGE
(1) POWER SUPPLY
Rated voltage Guaranteed voltage (V)
Indoor unit
208/230 V
1 phase
60 Hz
Min. 187 208 230 Max. 253
(2) OPERATION
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
3-2. OUTLET AIR SPEED AND COVERAGE RANGE
Model Mode Function Airow
(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
● 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.
OBH501D

7
OUTLINES AND DIMENSIONS4
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)
Insulation ø1-1/8 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
OBH501D

8
5 WIRING DIAGRAM
MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA
MSZ-D30NA- 8MSZ-D36NA- 8MSY-D30NA- 8MSY-D36NA- 8
OBH501D

9
REFRIGERANT SYSTEM DIAGRAM6
MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA Unit : inch
Refrigerant flow in cooling
Refrigerant flow in heating (MSZ-D30NA MSZ-D36NA only)
Indoor
heat
exchanger
Strainer
Room temperature
thermistor
R
T11
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)
Joint
Flared connection
Joint connection
OBH501D

10
7 SERVICE FUNCTIONS
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.)
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.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below :
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
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.
Table 1
1 unit operation 2 units operation 3 units operation 4 units operation
No. 1 unit No modication 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
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.
MSZ-D30NA MSZ-D36NA MSY-D30NA MSY-D36NA
OBH501D