Mitsubishi Electric MUZ-FA25VA User manual

SERVICE MANUAL
CONTENTS
1. TECHNICAL CHANGES ····································2
2. PART NAMES AND FUNCTIONS······················5
3. SPECIFICATION·················································5
4. NOISE CRITERIA CURVES·······························7
5. OUTLINES AND DIMENSIONS ·························8
6. WIRING DIAGRAM ············································9
7. REFRIGERANT SYSTEM DIAGRAM··············11
8. PERFORMANCE CURVES······························13
9. ACTUATOR CONTROL····································21
10. SERVICE FUNCTIONS·····································22
11. TROUBLESHOOTING······································22
12. DISASSEMBLY INSTRUCTIONS·····················39
13. PARTS LIST······················································42
Wireless type
Models
No. OB372
SPLIT-TYPE, HEAT PUMPAIR CONDITIONERS
MUZ-FA25VA -
MUZ-FA35VA -
MUZ-FA25VAH -
MUZ-FA35VAH - E1
E1
E1
E1
MUZ-FA25VA -
MUZ-FA35VA -
MUZ-FA25VAH -
MUZ-FA35VAH - E1
E1
E1
E1
Indication of
model name
NOTE:
This service manual describes technical data of the outdoor units.
•As for indoor units MSZ-FA25VA- and MSZ-FA35VA- , refer to the service manual OB371.
E1E1
HFC
utilized
R410A
OB372--1qxp 05.1.17 15:28 Page 1

2
1TECHNICAL CHANGES
Refrigeration
oil
Refrigerant
New refrigerant
R410A
HFC-32: HFC-125 (50%:50%)
Pseudo-azeotropic refrigerant
Not included
A1/A1
72.6
-51.4
1.557
64
Non combustible
0
1730
From liquid phase in cylinder
Possible
Incompatible oil
Non
Non
Previous refrigerant
R22
R22 (100%)
Single refrigerant
Included
A1
86.5
-40.8
0.94
44.4
Non combustible
0.055
1700
Gas phase
Possible
Compatible oil
Light yellow
Non
Refrigerant
Composition (Ratio)
Refrigerant handling
Chlorine
Safety group (ASHRAE)
Molecular weight
Boiling point (:)
Steam pressure [25:](Mpa)
Saturated steam density [25:](Kg/K)
Combustibility
ODP w1
GWP w2
Refrigerant charge method
Additional charge on leakage
Kind
Color
Smell
w1:Ozone Destruction Parameter : based on CFC-11
w2 :Global Warmth Parameter : based on CO2
INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT
• This room air conditioner adopts HFC refrigerant (R410A) which never destroys the ozone layer.
• Pay particular attention to the following points, though the basic installation procedure is same as that for R22 air
conditioners.
1As R410A has working pressure approximate 1.6 times as high as that of R22, some special tools and piping parts/
materials are required. Refer to the table below.
2Take sufficient care not to allow water and other contaminations to enter the R410A refrigerant during storage and
installation, since it is more susceptible to contaminations than R22.
3For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant
piping.)
4Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent
composition change.
MUZ-A09YV - ➔MUZ- FA25VA -
MUZ-A09YVH - ➔MUZ-FA25VAH - E1E1
E1E1
MUZ-A12YV - ➔MUZ-FA35VA -
MUZ-A12YVH - ➔MUZ-FA35VAH - E1E1
E1E1
1.Indication of capacity has been changed.(BTU base➔kW base)
2.Control method between indoor and outdoor unit has been changed.
3.Power supply method has been changed (change to supply from outdoor unit).
4. Terminal block for power supply has been added.
5.Power P.C.board has been changed.
6.Inverter P.C. board has been changed.
7.Refrigerant circuit has been changed.
• Compressor has been changed.(KNB073FBVH➔KNB073FDVH)
• Specification and position of muffler have been changed.
• Path of outdoor heat exchanger has been changed.
• 4-way valve and R.V. coil have been changed.
• Stop valve has been changed.
8.Fan motor has been changed.(AC➔DC)
9.Shape of grille has been changed.
10.Shape of service panel has been changed.
11.Shape of propeller has been changed.
12.Quick Clean Kit has been added.
13.Symbol on terminal block has been changed (to S1/S2/S3).
1.Indication of capacity has been changed.(BTU base➔kW base)
2.Control method between indoor and outdoor unit has been changed.
3.Power supply method has been changed (change to supply from outdoor unit).
4.Power P.C.board has been changed.
5.Terminal block for power supply has been added.
6.Inverter P.C. board has been changed.
7.Refrigerant circuit has been changed.
• Compressor has been changed.(KNB092FAAH➔KNB092FCAH)
• Specification and position of muffler have been changed.
• Outdoor heat exchanger has been changed.
• 4-way valve and R.V. coil have been changed.
• Stop valve has been changed.
8.Fan motor has been changed.(AC➔DC)
9.Shape of grille has been changed.
10.Shape of service panel has been changed.
11.Shape of propeller has been changed.
12.Quick Clean Kit has been added.
13.Symbol on terminal block has been changed (to S1/S2/S3).
OB372--1qxp 05.1.17 15:28 Page 2

3
-30 -20 -10 0 10 20 30 40 50 60
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
(MPa [Gauge])
R410A
R22
Conversion chart of refrigerant temperature and pressure
Saturated liquid pressure
(:)
NOTE :The unit of pressure has been changed to MPa on the
international system of units(SI unit system).
The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/ff[Gauge])
R410A tools Can R22 tools be used?
Gas leak detector
R410A has high pressures beyond the measurement range of existing
gauges. Port diameters have been changed to prevent any other refrigerant
from being charged into the unit.
Hose material and cap size have been changed to improve the pressure
resistance.
Dedicated for HFC refrigerant.
6.35 mm and 9.52 mm
Description
Clamp bar hole has been enlarged to reinforce the spring strength in the tool.
Provided for flaring work (to be used with R22 flare tool).
Provided to prevent the back flow of oil. This adapter enables you to use
vacuum pumps.
It is difficult to measure R410Awith a charging cylinder because the
refrigerant bubbles due to high pressure and high-speed vaporization
No
No
No
Yes
Yes
New
New
New
Gauge manifold
Charge hose
Torque wrench
Flare tool
Flare gauge
Vacuum pump
adapter
Electronic scale for
refrigerant charging
No : Not Substitutable for R410A Yes : Substitutable for R410A
No 12.7 mm
1.Tools dedicated for the air conditioner with R410A refrigerant
The following tools are required for R410A refrigerant. Some R22 tools can be substituted for R410A tools.
The diameter of the service port on the stop valve in outdoor unit has been changed to prevent any other refrigerant being
charged into the unit. Cap size has been changed from 7/16 UNF with 20 threads to 1/2 UNF with 20 threads.
NOTE : The unit of pressure has been changed to MPa on the international system of units(SI unit system).
The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/ff[Gauge])
New Specification Current Specification
The incompatible refrigeration oil easily separates from
refrigerant and is in the upper layer inside the suction muffler.
Raising position of the oil back hole enables to back the
refrigeration oil of the upper layer to flow back to the
compressor.
Since refrigerant and refrigeration oil are compatible each,
refrigeration oil goes back to the compressor through the
lower position oil back hole.
Compressor
Suction muffler
Oil back hole
refrigeration oil
Refrigerant
Compressor
Suction muffler
Oil back hole
refrigeration oil /Refrigerant
Compressor
OB372--1qxp 05.1.17 15:28 Page 3

4
Electronic scale for refrigerant charging
Outdoor unit
Refrigerant gas
cylinder
operating valve
Refrigerant gas cylinder
for R410A with siphon
Refrigerant (liquid)
Service port
Gauge manifold
valve (for R410A)
Union
Liquid pipe
Gas pipe
Stop valve
Indoor unit
Charge hose (for R410A)
R410A
Pipe diameter
mm
6.35
9.52
12.7
17
22
26
Dimension of flare nut
R22
17
22
24
2Flaring work and flare nut
Flaring work for R410A pipe differs from that for R22 pipe.
For details of flaring work, refer to Installation manual “FLARING WORK”.
3.Refrigerant oil
Apply the special refrigeration oil (accessories: packed with indoor unit) to the flare and the union seat surfaces.
4.Air purge
• Do not discharge the refrigerant into the atmosphere.
Take care not to discharge refrigerant into the atmosphere during installation, reinstallation, or repairs to the refrigerant
circuit.
• Use the vacuum pump for air purging for the purpose of environmental protection.
5.Additional charge
For additional charging, charge the refrigerant from liquid phase of the gas cylinder.
If the refrigerant is charged from the gas phase, composition change may occur in the refrigerant inside the cylinder and the
outdoor unit. In this case, ability of the refrigeration cycle decreases or normal operation can be impossible. However,
charging the liquid refrigerant all at once may cause the compressor to be locked. Thus, charge the refrigerant slowly.
2.Refrigerant piping
1Specifications
Use the refrigerant pipes that meet the following specifications.
• Use a copper pipe or a copper-alloy seamless pipe with a thickness of 0.8 mm. Never use any pipe with a thickness less
than 0.8mm, as the pressure resistance is insufficient.
Wall
thickness
Outside diameter
Pipe mm
For liquid
For gas
6.35
9.52
12.7
0.8 mm
0.8 mm
0.8 mm
Heat resisting foam plastic
Specific gravity 0.045 Thickness 8 mm
Insulation material
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5
PART NAMES AND FUNCTIONS
2
OUTDOOR UNIT
Air inlet
Air outlet
Drain outlet
Piping
Drain hose
(back and side)
ACCESSORIES
1Drain socket 1
2Quick clean kit 1
MUZ-FA25VA - E1 MUZ-FA25VAH - E1
MUZ-FA35VA - E1 MUZ-FA35VAH - E1
1
Single phase
230V,50Hz
3.5
KNB073FDVH
550
U-V 1.53 U-W 1.53
V-W 1.53
RC0J50-AL
WHT-BLK 37.5
BLK-RED 37.5
RED-WHT 37.5
800o550o285
33
46
0.90
320 (NEO22)
32.6
13.4
17
10
Cooling
2.5(0.9-3.2)
1.4
2,058
2.44
0.31
4.20
810W/750W
2
Heating
3.2(0.9-5.0)
—
1,938
2.97
0.28
4.35
880W/810W/650W
3
MUZ-FA25VA - E1
E1
MUZ-FA25VAH -
Single phase
230V,50Hz
2,004
4.6
KNB092FCAH
650
U-V 0.49 U-W 0.49
V-W 0.49
RC0J50-AL
WHT-BLK 37.5
BLK-RED 37.5
RED-WHT 37.5
800o550o285
37
1.05
320 (NEO22)
32.6
13.4
17
10
Cooling
3.5(1.0-4.1)
2.0
3.72
0.33
3.74
47
840W/760W
2
Heating
4.0(0.9-6.0)
—
4.02
0.33
4.02
48
880W/800W/630W
3
Outdoor model
Function
Power supply
Capacity Rated frequency(Min.-Max.)
Dehumidification
Air flow ✽1
Starting current (Total) ✽1
Compressor motor current ✽1
Fan motor current ✽1
Model
Output
Winding
resistance(at 20:)
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Sound level ✽1
Fan speed(HighW/LowW, High/Med.W/LowW)
Fan speed regulator
Refrigerant filling
capacity(R410A)
Refrigeration oil (Model)
Thermistor RT61
(at 0:)
Thermistor RT62(at 100:)
Thermistor RT64(at 50:)
Thermistor RT65(at 25:)
kW
r/h
K/h
A
A
A
✽1
W
"
"
mm
kg
dB(A)
rpm
kg
cc
k"
k"
k"
k"
Compressor
Fan motor
Special remarks
Coefficient of performance(C.O.P)
Capacity
Electrical data
MUZ-FA35VA - E1
E1
MUZ-FA35VAH -
NOTE : Test conditions are based on ISO 5151
Cooling : Indoor Dry-bulb temperature 27:Wet-bulb temperature 19:
Outdoor Dry-bulb temperature 35:Wet-bulb temperature(24:)
Heating : Indoor Dry-bulb temperature 20:Wet-bulb temperature 15:
Outdoor Dry-bulb temperature 7:Wet-bulb temperature 6:
Refrigerant piping length (one way): 5m
✽1 Measured under rated operating frequency
wReference value
3SPECIFICATION
MUZ-FA25VA - MUZ-FA35VA -
MUZ-FA25VAH - MUZ-FA35VAH - E1E1
E1E1
OB372--1qxp 05.1.17 15:29 Page 5

6
OUTDOOR UNIT
Model
Item
Current transformer
Current transformer
Smoothing capacitor
Diode module
Fuse
Fuse
Defrost heater
Intelligent power module
Expansion valve coil
Reactor
Current-detecting resistor
Current-detecting resistor
Current-limiting resistor
Terminal block
Relay
Relay
Relay
R.V. coil
Heater protector
MUZ-FA25VA - E1
(CT)
(CT761, CT781)
(
C63A, C63B, C63C )
(DB61, DB65)
(F61)
(F71, F801)
(H)
(IPM)
(LEV)
(L61)
(R61)
(R831)
(
R64A, R64B )
(TB1,TB2)
(X63)
(X64)
(X66)
(21S4)
(26H)
MUZ-FA25VAH - E1 MUZ-FA35VA - E1 MUZ-FA35VAH - E1
ETA19Z59BZ
ETQ19Z71AY
620+ 420V
D25XB60
250V 20A
250V 3.15A
PS21244-A-203
CAD-MD12ME 12VDC
10A 23.0mH
25m"5W
5.1"5W
3P
G5NB-1a
G4A-1A-PS
STF-01AJ503
—
—
—
230V 130W
G5NB-1a
Open 45:
—
—
—
230V 130W
G5NB-1a
Open 45:
45m"5W (1 element) 50m"5W (2 elements)
Specifications and rating conditions of main electric parts
OB372--1qxp 05.1.17 15:29 Page 6

7
NOISE CRITERIA CURVES
4
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
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
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING
FUNCTION SPL(dB(A)) LINE
High
Med.
FAN SPEED
HEATING
46
46
Test conditions,
Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:)
Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:
MUZ-FA25VA -
MUZ-FA25VAH - E1
E1
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
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
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
COOLING
FUNCTION SPL(dB(A)) LINE
FAN SPEED
HEATING
47
48
Test conditions,
Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:)
Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:
OUTDOORUNIT
MICROPHONE
1m
High
Med.
MUZ-FA35VA -
MUZ-FA35VAH - E1
E1
OB372--1qxp 05.1.17 15:29 Page 7

8
5OUTLINES AND DIMENSIONS
10
69
800
302.5
500 Bolt pitch for installation
150
22.3
Handle
550
280
164.5
99.5
170.5
23 Service panel
Service port
285
344.5
44
400
Air in
Air out
Air in
17.5
Bolt pitch for
installation
304~325
40
Liquid refrigerant pipe joint
Refrigerant pipe (flared) [6.35
Gas refrigerant pipe joint
Refrigerant pipe (flared) [9.52
43-
35-
2 holes 10X21
Drain hole [33 (MUZ-FA25/FA35VAH)
REQUIRED SPACE Basically open 100mm or more
without any obstruction in front
and on both sides of the unit.
350mm or more
200mm or more
100mm or more
100mm or more
Open two sides of left,
right, or rear side.
Drain hole [42 (MUZ-FA25/FA35VA)
Unit: mm
OUTDOOR UNIT
MUZ-FA25VA - MUZ-FA35VA -
MUZ-FA25VAH - MUZ-FA35VAH - E1E1
E1E1
OB372--1qxp 05.1.17 15:29 Page 8

9
WIRING DIAGRAM
6
OUTDOOR UNIT
SYMBOL CT,CT761,CT781 C63A,C63B,C63C DB61,DB65 DSA61 F61 F71,F801 IC801 IPM LEV
SYMBOL L61 L62,L63 MC MF
NR63,NR64 RT61 RT62 RT64 RT65
SYMBOL
R61,R831 R64A,R64B TB1,TB2 TR821 T801 X63,X64 21S4
NAME
CURRENT TRANSFORMER SMOOTHING CAPACITOR DIODE MODULE SURGE ABSORBER FUSE (T20AL250V) FUSE (T3.15AL250V) INTELLIGENT POWER DEVICE INTELLIGENT POWER MODULE EXPANSION VALVE COIL
NAME
REACTOR CMC COIL COMPRESSOR OUTDOOR FAN MOTOR VARISTOR DEFROST THERMISTOR
DISCHARGE TEMPERATURE THERMISTOR FIN TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR
NAME
CURRENT-DETECTING RESISTOR CURRENT-LIMITING RESISTOR TERMINAL BLOCK SWITCHING POWER TRANSISTOR TRANSFORMER RELAY R.V. COIL
NOTE:1. About the indoor side electric wiring refer to
the indoor unit electric wiring diagram for servicing.
2.Use copper conductors only. (For field wiring) 3. Symbols below indicate.
/: Terminal block, : Connector
MODELS WIRING DIAGRAM
MUZ-FA25VA -
MUZ-FA35VA - E1
E1
~/N
230V~
12-24V
230V 50Hz
CIRCUIT BREAKER
PE
RED
BLU
WHITE
GRN/YLW
TB1
POWER SUPPLY
L N
R64A
TB2
S3
S1
TO INDDOR UNIT
CONNECTING
S2
RED BLU
WHT R64B
WHT + + +
NR63
LDE
GRN
4
6
21
2 31CN601
4 5
31 2 4 5
32
12 4 5 1 3
CN931 CN932 43 1 21 2
TB800
RT65 RT64RT62RT61
POWER P.C. BOARD CN643 CN641
INVERTER P.C. BOARD
CN642
21S4
MF
X63
CN721
1 2IC801
F801
C63C
LD-V
LD-W
LD-U
3
1
WHT BLK RED RED
V
BLK
WHT
WU
MC
CN61
IPM
CT781 CT761
2
CN724 LEV
6
R61
N
U V W
P
L61
BLK
R831
TAB63
3
LD69
DB65
DB61
LD70
TR821
C63B
C63A
BLK
T801
L63
NR64
DSA61
F61
CT
LDY
TAB61 L62
X64
4
F71
TAB62
GRN
BLK
BLU
C N 7 2 7 C N 7 2 6
C N 7 2 5
OB372--1qxp 05.1.17 15:29 Page 9

10
OUTDOOR UNIT
MUZ-FA25VAH -
MUZ-FA35VAH - E1
E1
SYMBOL CT,CT761,CT781 C63A,C63B,C63C DB61,DB65 DSA61 F61 F71,F801 H IC801 IPM LEV
SYMBOL L61 L62,L63 MC MF
NR63,NR64 RT61 RT62 RT64 RT65 R61,R831
SYMBOL R64A,R64B TB1,TB2 TR821 T801 X63,X64,X66 21S4 26H
NAME
CURRENT TRANSFORMER SMOOTHING CAPACITOR DIODE MODULE SURGE ABSORBER FUSE (T20AL250V) FUSE (T3.15AL250V) DEFROST HEATER INTELLIGENT POWER DEVICE INTELLIGENT POWER MODULE EXPANSION VALVE COIL
NAME
REACTOR CMC COIL COMPRESSOR OUTDOOR FAN MOTOR VARISTOR DEFROST THERMISTOR
DISCHARGE TEMPERATURE THERMISTOR FIN TEMPERATURE THERMISTOR AMBIENT TEMPERATURE THERMISTOR CURRENT-DETECTING RESISTOR
NAME
CURRENT-LIMITING RESISTOR TERMINAL BLOCK SWITCHING POWER TRANSISTOR TRANSFORMER RELAY R.V. COIL HEATER PROTECTOR
NOTE:1. About the indoor side electric wiring refer to
the indoor unit electric wiring diagram for servicing.
2.Use copper conductors only. (For field wiring) 3. Symbols below indicate. /: Terminal block, : Connector
MODELS WIRING DIAGRAM
PE
CIRCUIT BREAKER
~/N 230V 50Hz
POWER SUPPLY
230V~
TO INDDOR UNIT
CONNECTING
REDBLU WHITE
GRN/YLW
TB1
L N
R64A
TB2
S1 S2
RED BLU WHT
R64B
WHT
H
26H
+ + +
CT 43
NR64 NR63
GRN DSA61
LDE
2 31 4 5
CN601 LDY
GRN
MF
RT65 RT64RT62RT61
31 2 4 5
21
32
12 4 513
CN931 CN932 43 1 21 2
CN643 CN641 CN642
3 1 2X66
CN722
1 2YLW
BLK BLK
BLKBLK
BLK BLK 1
2BLK
RED
6
4
C N 7 2 7 C N 7 2 6
C N 7 2 5
TB800
POWER P.C. BOARD INVERTER P.C. BOARD
21S4
X63
CN721
1 2IC801
F801
C63C
LD-V
LD-W
LD-U
3
1
WHT BLK RED RED
V
BLK
WHT
WU
MC
CN61
IPM
CT781
CT761
2
CN724 LEV
6
R61
N
U V W
P
L61
BLK
R831
TAB63
LD69
DB65
DB61
LD70
TR821
C63B
C63A
BLK
T801
L63
F61 TAB61 L62
X64
F71
TAB62
BLK
BLU
12-24V
S3
OB372--1qxp 05.1.17 15:29 Page 10