Mitsubishi Electric MXZ-2HJ40VA User manual

Models
MXZ-2HJ40VA -E1 ,ER1 ,ET1
MXZ-3HJ50VA -E1 ,ER1 ,ET1
HFC
utilized
R410A
INDOOR UNIT
SERVICE MANUAL No. OBH709
REVISED EDITION-A
OUTDOOR UNIT
CONTENTS
1. TECHNICAL CHANGES ··································· 2
2. PART NAMES AND FUNCTIONS····················· 3
3. SPECIFICATION················································ 4
4. NOISE CRITERIA CURVES······························ 6
5. OUTLINES AND DIMENSIONS ························ 7
6. WIRING DIAGRAM············································ 9
7. REFRIGERANT SYSTEM DIAGRAM············· 10
8. PERFORMANCE CURVES····························· 13
9. ACTUATOR CONTROL··································· 19
10. SERVICE FUNCTIONS···································· 20
11. TROUBLESHOOTING····································· 24
12. DISASSEMBLY INSTRUCTIONS···················· 50
INDOOR UNITS COMBINATION SHEETS
NOTE:
RoHS compliant products have <G> mark
on the spec name plate.
PARTS CATALOG (OBB709)
MXZ-2HJ40VA
Indoor unit service manual
MSZ-HJ•VA Series (OBH647C)
Please void OBH709.
Revision A:
• Additional refrigerant charge for MXZ-
3HJ50- E1 ,ER1 ,ET1 has been corrected.

2
<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 remove 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.
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.
TECHNICAL CHANGES
1
MXZ-2HJ40VA - E1 , ER1 , ET1
MXZ-3HJ50VA - E1 , ER1 , ET1
1. New model
Revision A:
• Additional refrigerant charge for MXZ-3HJ50- E1 ,ER1 ,ET1 has been corrected.
(Refer to 7. REFRIGERANT SYSTEM DIAGRAM.)
OBH709A

3
PART NAMES AND FUNCTIONS
2
ACCESSORIES
MXZ-2HJ40VA
Air inlet
Air outlet
Drain outlet
Piping
Drain hose
(Back and side)
Model MXZ-2HJ40VA MXZ-3HJ50VA
Drain socket 1 1
Drain cap 2
Air outlet
Drain outlet
Air inlet
(Back and side)
MXZ-3HJ50VA
OBH709A

4
SPECIFICATION
3
Outdoor model MXZ-2HJ40VA
Outdoor unit power supply Single phase
230 V, 50 Hz
System
Indoor units number 2
Piping total length m Max. 30
Connecting pipe length m Max. 20
Height difference (Indoor ~ Outdoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.
Height difference (Indoor ~ Indoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.
Function Cooling Heating
Capacity Rated frequency (Min.-Max.) 2 kW 4.0 (1.1 - 4.3) 4.3 (1.0 - 4.7)
Breaker capacity A 15
Electrical
data
Power input (Total) 1, 2 W 1,050 1,160
Running current (Total) 1, 2 A 5.1 5.6
Power factor (Total) 1, 2% 90
Starting current (Total) 1, 2 A 5.6
Coefficient of performance (C.O.P) (Total) 1, 2 3.81 3.71
Compressor
Model KNB092FFDHC
Output W 1,100
Current 1, 2 A 4.7 5.2
Refrigeration oil (Model) L 0.32 (NEO22)
Fan motor
Model RC0J50-FA
Current 1, 2 A 0.19 0.23
Dimensions W x H x D mm 800 x 550 x 285
Weight kg 32
Special
remarks
Air flow (Rated) m3/h 1,752 1,914
Sound level (Rated) dB(A) 48 52
Fan speed (Rated) rpm 840 910
Refrigerant filling capacity (R410A) kg 0.95
1 Measured under rated operating frequency.
2 When connected with below indoor units.
MSZ-HJ25VA + MSZ-HJ25VA
NOTE: Test conditions are based on ISO 5151. (Refrigerant piping length (one way): 5 m)
COOLING INDOOR Dry-bulb temperature 27.0 °C Wet-bulb temperature 19.0 °C
OUTDOOR Dry-bulb temperature 35.0 °C Wet-bulb temperature 24.0 °C
HEATING INDOOR Dry-bulb temperature 20.0 °C
OUTDOOR Dry-bulb temperature 7.0 °C Wet-bulb temperature 6.0 °C
OBH709A

5
Outdoor model MXZ-3HJ50VA
Outdoor unit power supply Single phase
230 V, 50 Hz
System
Indoor units number 2 to 3
Piping total length m Max. 50
Connecting pipe length m Max. 25
Height difference (Indoor ~ Outdoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.
Height difference (Indoor ~ Indoor) m Refer to 7 REFRIGERANT SYSTEM DIAGRAM.
Function Cooling Heating
Capacity Rated frequency (Min.-Max.) 2 kW 5.0 (2.7 - 6.5) 6.0 (2.4 - 7.5)
Breaker capacity A 25
Electrical
data
Power input (Total) 1, 2 W 1,130 1,310
Running current (Total) 1, 2 A 5.0 5.8
Power factor (Total) 1, 2% 99
Starting current (Total) 1, 2 A 5.8
Coefficient of performance (C.O.P) (Total) 1, 2 4.42 4.58
Compressor
Model SNB130FGBH1T
Output W 1,300
Current 1, 2 A 4.5 5.3
Refrigeration oil (Model) L 0.7 (NEO22)
Fan motor
Model SIC-71FW-F764-1
Current 1, 2 A 0.20 0.23
Dimensions W x H x D mm 840 x 710 x 330
Weight kg 57
Special
remarks
Air flow (Rated) m3/h 2,252 2,379
Sound level (Rated) dB(A) 50 53
Fan speed (Rated) rpm 630 660
Refrigerant filling capacity (R410A) kg 2.7
1 Measured under rated operating frequency.
2 When connected with below indoor units.
MSZ-HJ25VA + MSZ-HJ25VA + MSZ-HJ25VA
NOTE: Test conditions are based on ISO 5151. (Refrigerant piping length (one way): 5 m)
COOLING INDOOR Dry-bulb temperature 27.0 °C Wet-bulb temperature 19.0 °C
OUTDOOR Dry-bulb temperature 35.0 °C Wet-bulb temperature 24.0 °C
HEATING INDOOR Dry-bulb temperature 20.0 °C
OUTDOOR Dry-bulb temperature 7.0 °C Wet-bulb temperature 6.0 °C
OBH709A

6
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
CoolingHigh
FUNCTION
FAN SPEED
HeatingHigh
48
SPL(dB(A))
52
LINE
NOISE CRITERIA CURVES
4
MXZ-2HJ40VA
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
CoolingHigh
FUNCTION FAN SPEED
HeatingHigh
50
SPL(dB(A))
53
LINE
MXZ-3HJ50VA
OUTDOOR UNIT
MICROPHONE
1m
Test conditions
Cooling :Dry-bulb temperature 35°C Wet-bulb temperature 24°C
Heating :Dry-bulb temperature 7°C Wet-bulb temperature 6°C
OBH709A

7
OUTLINES AND DIMENSIONS
5
MXZ-2HJ40VA Unit: mm
OBH709A

8
1.Installation space
Note : Leave front and both sides
free of obstruction.
Note : Leave rear, overhead and
both sides free of obstruction.
500 or more
100 or more
Note : Leave front and overhead
free of obstruction.
100 or more 350 or more
200 or more
500 or more
2.Service space
100 or more
500 or more
350 or more
350 or more
100 or more Service space
Liquid pipe : Ø6.35(flared)1/4 C unit connection
B unit connection
A unit connection
Gas pipe : Ø9.52(flared)3/8
Liquid pipe : Ø6.35(flared)1/4
Gas pipe : Ø9.52(flared)3/8
Liquid pipe : Ø6.35(flared)1/4
Gas pipe : Ø9.52(flared)3/8
MXZ-3HJ50VA Unit: mm
OBH709A

9
WIRING DIAGRAM
6
MXZ-2HJ40VA - E1 , ER1 , ET1
MXZ-3HJ50VA - E1 , ER1 , ET1
OBH709A

10
UNIT: mm (inch)
Piping length each indoor unit (a, b) 20 m
Total piping length (a+b) 30 m
Bending point for each unit 20
Total bending point 30
MXZ-2HJ40VA
MAX REFRIGERANT PIPING LENGTH
a
b
Outdoor
unit
Indoor
units
15 m
10 m
15 m
Refrigerant piping length (one way, 2 unit total)
Calculation : Xg = 20 g/m x (Refrigerant piping length (m) - 20)
Outdoor unit
precharged
(g) 30 m
200
20 m
0
950
Max.
Height
difference
Outdoor unit union diameter
For
Indoor unit A Liquid 6.35(1/4)
Gas 9.52(3/8)
Indoor unit B Liquid 6.35(1/4)
Gas 9.52(3/8)
Stop valve
(with strainer #100) LEV A
LEV B
Compressor
Muffler
4-way valve
Indoor unit
B
Indoor unit
A
Indoor unit
A
Indoor unit
B
Capillary tube
Capillary tube
Stop valve
(with strainer #100)
Refrigerant flow in cooling
Refrigerant flow in heating
Discharge
temperature
thermistor RT62
Stop valve
(with service port)
Stop valve
(with service port)
Strainer
#100
Sub muffler
Defrost
thermistor
RT61
Ambient
temperature
thermistor
RT65
Outdoor heat
exchanger
temperature
thermistor
RT68 FAN-OUT
HEX-OUT
It is irrelevant which unit is higher.
ADDITIONAL REFRIGERANT CHARGE
UNIT: mm
REFRIGERANT SYSTEM DIAGRAM
7
Refrigerant pipe diameter is different according to indoor unit to be
connected. When using extension pipes, refer to the right table.
When diameter of refrigerant pipe is different from that of outdoor
unit union, use optional Different-diameter pipe.
For further information on Different-diameter pipe, refer to "PARTS
CATALOG".
OBH709A