Mitsubishi Electric MUZ-A24YV, MUZ-A26YV Service Manual
SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
HFC
utilized
R410A
Wireless type
Models
Revision E:
• ”Check of outdoor thermistors” has been corrected.
Please void OB346 REVISED EDITION-D.
No. OB346
REVISED EDITION-E
MUZ-A18YV MUZ-A24YV MUZ-A26YV -
Indication of
model name
MUZ-A18YV MUZ-A24YV MUZ-A26YV -
E1
E1
E1
CONTENTS
1. TECHNICAL CHANGES ····································3
2. PART NAMES AND FUNCTIONS······················6
3. SPECIFICATION·················································7
4. NOISE CRITERIA CURVES·····························10
E1
E1
E1
5. OUTLINES AND DIMENSIONS························11
6. WIRING DIAGRAM ··········································12
7. REFRIGERANT SYSTEM DIAGRAM··············14
8. PERFORMANCE CURVES······························16
9. ACTUA TOR CONTROL····································31
10. TROUBLESHOOTING······································32
11. DISASSEMBLY INSTRUCTIONS·····················46
12. PARTS LIST······················································50
NOTE:
This service manual describes technical data of the outdoor units.
•As for indoor units MSZ-A18YV - , MSZ-A24YV - and MSZ-A26YV - , refer to the
service manual OB345.
•As for indoor units MCFZ-A18WV - and MCFZ-A24WV - , refer to the service manual
OB344.
E1E1E1
E1E1
Revision A:
• MUZ-A18YV - can be connected to MCFZ-A18WV - .
• MUZ-A24YV - can be connected to MCFZ-A24WV - .
E1E1
E1E1
Revision B:
• Part number of 4-WAY VALVE has been corrected.
Model Revise point
MUZ-A18YV - E1
MUZ-A24YV - E1
MUZ-A26YV - E1
12-1. No.18
12-1. No.18
12-1. No.18
Part Name
4-WAY VALVE
4-WAY VALVE
4-WAY VALVE
Revision C:
• “Check of HPS ” has been corrected.
Revision D:
• Compressor has been changed. (MUZ-A18/24YV)
PARTS LIST number
E02 851 900
E02 939 900
Previous
New
Model
SNB130FLDH
SNB130FLDH1
E02 679 961
E02 679 961
E02 679 961
Part Number
Correct Incorrect
E02 891 961
E02 891 961
E02 891 961
Revision E:
•”Check of outdoor thermistors” of “10. TROUBLESHOOTING” has been corrected.
2
1
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 CO
2
New Specification Current Specification
The incompatible refrigerating 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
refrigerating oil of the upper layer to flow back to the
compressor.
Since refrigerant and refrigerating oil are compatible each,
refrigerating oil backs to the compressor through the lower
position oil back hole.
Compressor
Suction muffler
Oil back hole
Refrigerating oil
Refrigerant
Compressor
Suction muffler
Oil back hole
Refrigerating oil /Refrigerant
Compressor
TECHNICAL CHANGES
INFORMATION FOR THE AIR CONDITIONER WITH R410A REFRIGERANT
• This room air conditioner adopts an 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.
1 As 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.
2 Take sufficient care not to allow water and other contaminations to enter the R410Arefrigerant during storage and
installation, since it is more susceptible to contaminations than R22.
3 For refrigerant piping, use clean, pressure-proof parts/materials specifically designed for R410A. (Refer to 2. Refrigerant
piping.)
4 Composition change may occur in R410A since it is a mixed refrigerant. When charging, charge liquid refrigerant to prevent
composition change.
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])
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
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 R410A with 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 and 15.88mm
Wall
thickness
Outside diameter
Pipe
mm
For liquid
For gas
6.35
9.52
12.7
15.88
0.8 mm
0.8 mm
0.8 mm
1.0 mm
Heat resisting foam plastic
Specific gravity 0.045 Thickness 8 mm
Insulation material
international system of units(SI unit system).
The conversion factor is: 1(MPa [Gauge]) =10.2(kgf/ff[Gauge])
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 R410Atools.
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.
2.Refrigerant piping
1 Specifications
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 (6.35, 9.52, 12.7), 1.0 mm (15.88).
Never use any pipe with a thickness less than 0.8 mm (6.35, 9.52, 12.7), 1.0 mm (15.88), as the pressure resistance is
insufficient.
4
2 Flaring 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”.
Pipe diameter
mm
6.35
9.52
12.7
15.88
Dimension of flare nut
R410A
17
22
26
29
R22
17
22
24
27
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, capacity of the refrigerating 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.
Union
Stop valve
Indoor unit
Refrigerant gas
cylinder
operating valve
Liquid pipe
Gas pipe
Service port
Outdoor unit
Gauge manifold
valve (for R410A)
Charge hose (for R410A)
Refrigerant gas cylinder
for R410A with siphon
Refrigerant (liquid)
Electronic scale for refrigerant charging
5
2
PART NAMES AND FUNCTIONS
MUZ-A18YV MUZ-A24YV MUZ-A26YV -
OUTDOOR UNIT
ACCESSORIES
Drain socket
1
Drain cap [33
2
E1
E1
E1
Air inlet
(back and side)
Piping
Drain hose
Air outlet
Drain outlet
MUZ-A18YV MUZ-A24YV MUZ-A26YV -
E1
E1
E1
1
2
6
3
Single phase
230V,50Hz
20
7.38
0.30
SNB130FLDH or SNB130FLDH1
850
U-V 0.45 W-U 0.45
V-W 0.45
PM8H60-UB
BLK-WHT 15.2
WHT-RED 15.2 RED-BLK15.2
840o850o330
53
2
1.8
NEO22
13.4
10.0
17.0
10.0
Cooling
5.0(0.9~5.9)
2.5
2,940/1,650
W
6.62
1,500
98.5
6.32
3.21
53/51
W
800/480
W
Heating
5.9(0.9~7.8)
—
2,940/2,210
W
7.38
1,670
98.4
7.08
3.41
55/53
W
800/620
W
Single phase
230V,50Hz
20
98
8.87
0.30
SNB130FLDH or SNB130FLDH1
850
U-V 0.45 W-U 0.45
V-W 0.45
PM8H60-UB
BLK-WHT 15.2
WHT-RED 15.2 RED-BLK15.2
840o850o330
53
2
1.8
NEO22
13.4
10.0
17.0
10.0
Cooling
4.8(10.9~5.5)
2.4
2,940/1,650
W
7.76
1,750
7.46
2.62
53/51
W
800/480
W
Heating
6.0(0.9~7.5)
—
2,940/2,210
W
8.87
2,000
8.57
2.88
55/53
W
800/620
W
Outdoor model
Function
Power supply
Capacity Rated frequency(Min.~Max.)
Dehumidification
Air flow(High/LowW)
Power outlet
Running current
Power input
Power factor
Starting current ✽1
Compressor motor current ✽1
Fan motor current
Model
Output
Winding
resistance(at 20:)
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Sound level(High/LowW)
Fan speed(High/LowW)
Fan speed regulator
Refrigerant filling
capacity(R410A)
Refrigeration oil(Model)
Thermistor RT61(at 100:)
Thermistor RT62(at 25:)
Thermistor RT65(at 50:)
Thermistor RT68(at 25:)
kW
r/h
K /h
A
A
W
%
A
A
A
W
"
"
mm
kg
dB
rpm
kg
k"
k"
k"
k"
Compressor
Fan
motor
Special
remarks
Coefficient of performance(C.O.P) ✽1
Capacity
Electrical
data
MUZ-A18YV -
E1
E1
MSZ-A18YV -
Indoor model
MUZ-A18YV -
E1
E1
MCFZ-A18WV -
Indoor model
SPECIFICATION
NOTE : Test conditions are based on ISO 5151.
Cooling : Indoor DB 27: WB 19:
Heating : Indoor DB 20: WB 15:
Refrigerant piping length (one way): 5m
✽1 Measured under rated operating frequency.
w Reference value
Outdoor DB 35: WB (24:)
Outdoor DB 7: WB 6:
7
Single phase
230V,50Hz
20
98.4
8.75
0.30
SNB130FLDH or SNB130FLDH1
850
U-V 0.45 W-U 0.45
V-W 0.45
PM8H60-UB
BLK-WHT 15.2
WHT-RED 15.2 RED-BLK15.2
840o850o330
53
2
1.8
NEO22
13.4
10.0
17.0
10.0
Cooling
6.0(0.9~6.7)
3.0
2,940/1,650
W
8.49
1,921
8.19
3.02
53/51
W
800/480
W
Heating
6.8(0.9~8.1)
—
2,940/2,210
W
8.75
1,981
8.45
3.32
55/53
W
800/620
W
Single phase
230V,50Hz
20
98
10.47
0.30
SNB130FLDH or SNB130FLDH1
850
U-V 0.45 W-U 0.45
V-W 0.45
PM8H60-UB
BLK-WHT 15.2
WHT-RED 15.2 RED-BLK15.2
840o850o330
53
2
1.8
NEO22
13.4
10.0
17.0
10.0
Cooling
5.5(0.9~6.1)
3.1
2,940/1,650
W
10.38
2,340
10.08
2.27
53/51
W
800/480
W
Heating
6.4(0.9~7.9)
—
2,940/2,210
W
10.47
2,360
10.17
2.62
55/53
W
800/620
W
Single phase
230V,50Hz
20
98.3
11.42
0.30
TNB220FMCH
1,300
U-V 1.41 W-U 1.41
V-W 1.41
PM8H60-UB
BLK-WHT 15.2
WHT-RED 15.2 RED-BLK15.2
840o850o330
58
2
2.0
NEO22
13.4
10.0
17.0
10.0
Cooling
7.1(0.9~8.3)
3.8
2,940/1,650
W
10.75
2,431
10.45
2.84
53/51
W
800/480
W
Heating
8.1(0.9~9.6)
—
2,940/2,210
W
11.42
2,581
11.12
3.06
55/53
W
800/620
W
Outdoor model
Function
Power supply
Capacity Rated frequency(Min.~Max.)
Dehumidification
Air flow(High/LowW)
Power outlet
Running current
Power input
Power factor
Starting current ✽1
Compressor motor current ✽1
Fan motor current
Model
Output
Winding
resistance(at 20:)
Model
Winding
resistance(at 20:)
Dimensions WOHOD
Weight
Sound level(High/LowW)
Fan speed(High/LowW)
Fan speed regulator
Refrigerant filling
capacity(R410A)
Refrigeration oil(Model)
Thermistor RT61(at 100:)
Thermistor RT62(at 25:)
Thermistor RT65(at 50:)
Thermistor RT68(at 25:)
kW
r/h
K /h
A
A
W
%
A
A
A
W
"
"
mm
kg
dB
rpm
kg
k"
k"
k"
k"
Compressor
Fan
motor
Special
remarks
Coefficient of performance(C.O.P) ✽1
Capacity
Electrical
data
MUZ-A24YV -
E1
E1
MSZ-A24YV -
Indoor model
MUZ-A26YV -
E1
E1
MSZ-A26YV -
Indoor model
MUZ-A24YV -
E1
E1
MCFZ-A24WV -
Indoor model
NOTE : Test conditions are based on ISO 5151.
Cooling : Indoor DB 27: WB 19:
Outdoor DB 35: WB (24:)
Heating : Indoor DB 20: WB 15:
Outdoor DB 7: WB 6:
Refrigerant piping length (one way): 5m
✽1 Measured under rated operating frequency.
w Reference value
8
OUTDOOR UNIT
Model
Item
Smoothing capacitor
Current transformer
Current transformer
Fuse
Fuse
Fet array
High pressure switch
Power transistor module
Reactor
Expansion valve
Power factor controller
Resistor
Resistor
Resistor
Solenoid coil relay
Terminal block
Terminal block
Relay
R.V. coil
MUZ-A18YV
-
E1
(CB1,2,3)
(CT1,2)
(CT61)
(F801, F912)
(F911)
(HC932)
(HPS)
(IPM)
(L)
(LEV)
(PFC)
(R64)
(R934A,B)
(RS1~4)
(SSR61)
(TB1)
(TB2)
(X64)
(21S4)
MUZ-A24YV
-
E1
MUZ-A26YV
-
E1
560+ 450V
ETQ19Z68AY
ETQ19Z53AY
250V 3.15A
250V 1A
SLA5075
PS21244-A
340µH 20A
PS51259-A
10" 20W
1.1" 2W 2%
0.04" 7W
TLP3506
3P
2P
G4A
LD30013
ACB-DB156
CAM-40YGME 12VDC
–
CAM-30YGME 12VDC
Specifications and rating conditions of main electric parts
9
4
COOLING
FUNCTION
SPL(dB(A)) LINE
High
SPEED
HEATING
53
55
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
BAND CENTER FREQUENCIES, Hz
Test conditions,
Cooling : Dry-bulb temperature 35: Wet-bulb temperature (24:)
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
Heating : Dry-bulb temperature 7: Wet-bulb temperature 6:
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
NOISE CRITERIA CURVES
MUZ-A18YV MUZ-A24YV MUZ-A26YV -
E1
E1
E1
OUTDOOR UNIT
1m
MICROPHONE
10
5
OUTLINES AND DIMENSIONS
MUZ-A18YV MUZ-A24YV MUZ-A26YV -
OUTDOOR UNIT
515
299
66
51
34
330
850
430
E1
E1
E1
Unit: mm
REQUIRED SPACE
Open as a rule
500mm or more if
the front and both
198
sides are open
100mm or more
200mm or more if
there are obstacles
to both sides
350mm or more
Service panel
Liquid refrigerant
pipe joint
Refrigerant pipe
(flared) [6.35 (MUZ-A18/A24YV)
-
30
35-
Gas refrigerant
pipe joint
Refrigerant pipe
(flared) [12.7 (MUZ-A18YV)
[15.88 (MUZ-A24/A26YV)
[9.52 (MUZ-A26YV)
121
500
840
40
100mm or more
360
Open as a rule
80
500mm or more if the back,
both sides and top are open
155
90
11
6
WIRING DIAGRAM
MUZ-A18YV MUZ-A24YV -
OUTDOOR UNIT
W
RED
W
CT2
CB3
CB2
CB1
PFC
S
R
E1
E1
V
V
MC
IPM
U
WHT
CN5
21
MODELS WIRING DIAGRAM
BLK
U
CT1
RS3
RS1
21
CN3
RS4
RS2
CN4
CN2
27
RT65
POWER
BOARD
LD9
LD1LD2
12
6543 1
GRN
WHT
RED
BLK
BLK
PNK
GRY
3
1
12
BLU
ORN
CN931
CN801
CN701
MF
YLW
F801
RED
R934A
T801
BLK
WHT
23134512
CN932
HC932
R934B
diagram for servicing.
refer to the indoor unit electric wiring
1.About the indoor side electric wiringNOTES:
NAME
:Terminal block :Connector
3.Symbols below indicate.
2.Use copper conductors only (for field wiring).
L
TAB1
1
2
RED
4X64
RED
TAB4
R64
F912
YLW
4
3
NF
BRN
TB1
BLK
YLW
NR63
BLU
L
BLK
21
CT61
TAB2
PE
N
BLK
CN903
21
CN902
SSR61
F911
GRN/YLW
5123
CN901
CN912
13
LDE2
LDE1
BLU
BLU
GRN
GRN
BLK
BLK
BLK
BLK
BLK
BLK
BLK
BLK
21S4
ELECTRONIC
CN702
1567
5321
CN661
CN781
1
P.C. BOARD
CONTROL
RED
3
TB2
CN795
4123 78
CN601
3
BLU
N
6
LEV
FIN TEMPERATURE THERMISTOR
OUTDOOR HEAT EXCHANGER
RT65
SYMBOL
NAME
TERMINAL BLOCK
TERMINAL BLOCK
TRANSFORMER
SOLENOID COIL RELAY
TEMPERATURE THERMISTOR
T801
RT68
SSR61
TB1
TB2
R.V. COIL
RELAY
X64
21S4
RT62 RT61 RT68
OUTDOOR FAN MOTOR (INNER FUSE)
COMPRESSOR
MF
MC
SYMBOL
NAME
VARISTOR
NOISE FILTER
RESISTOR
POWER FACTOR CONTROLLER
NF
R64
PFC
NR63
DEFROST THERMISTOR
DISCHARGE TEMPERATURE THERMISTOR
RESISTOR
RESISTOR
RT62
RT61
RS1~4
R934A, B
CIRCUIT
BREAKER
POWER SUPPLY
~/N 230V 50Hz
NOISE FILTER
P.C. BOARD
12
TO INDOOR
UNIT
CONNECTING
12V
SMOOTHING CAPACITOR
CURRENT TRANSFORMER
CURRENT TRANSFORMER
FUSE (250V 1A)
FUSE (250V 3.15A)
FUSE (250V 3.15A)
POWER TRANSISTOR MODULE
FET ARRAY
IPM
F911
F801
F912
CT61
CT1, 2
CB1~3
SYMBOL
HC932
EXPANSION VALVE COIL
REACTOR
L
LEV
MUZ-A26YV -
OUTDOOR UNIT
E1
MODEL WIRING DIAGRAM
L
RED
W
CT2
PFC
R
1
2
S
RED
W
CB3
CB2
CB1
YLW
4
3
V
V
IPM
BLK
MC
CN5
21
BLK
U
BLK
WHT
U
CT1
RS3
RS1
27
BLK
21
RS4
RS2
CN2
RT65
CN3
CN4
6543 1
POWER
BOARD
LD9
LD1LD2
12
GRN
WHT
RED
BLK
BLK
BLK
BLK
BLK
PNK
GRY
3
1
12
BLU
ORN
CN931
CN801
CN701
CN702
MF
YLW
F801
T801
CN795
WHT
RED
R934A
6
BLK
23134512
CN932
HC932
R934B
LEV
diagram for servicing.
refer to the indoor unit electric wiring
1.About the indoor side electric wiringNOTES:
NAME
OUTDOOR HEAT EXCHANGER
RT68
SYMBOL
:Terminal block :Connector
3.Symbols below indicate.
2.Use copper conductors only (for field wiring).
TERMINAL BLOCK
TERMINAL BLOCK
TRANSFORMER
SOLENOID COIL RELAY
TEMPERATURE THERMISTOR
T801
SSR61
TB1
TB2
R.V. COIL
RELAY
X64
21S4
RED
4X64
TAB4
R64
F912
NF
TAB1
BRN
CIRCUIT
BREAKER
POWER SUPPLY
~/N 230V 50Hz
TB1
YLW
NR63
BLU
L
21
CN903
CT61
TAB2
PE
N
21
CN902
SSR61
F911
GRN/YLW
5123
CN901
CN912
13
LDE2
LDE1
1567
BLK
BLK
5321
BLK
BLK
BLK
BLU
BLU
21S4
GRN
GRN
NOISE FILTER
P.C. BOARD
ELECTRONIC
13
CN661CN681
CN781
1
P.C. BOARD
CONTROL
RED
3
TB2
TO INDOOR
UNIT
CONNECTING
41212
378
CN601
RED
3
BLU
N
12V
RED
HPS
RT62 RT61 RT68
NAME
OUTDOOR FAN MOTOR (INNER FUSE)
COMPRESSOR
MC
SYMBOL
NAME
SMOOTHING CAPACITORCB1~3
SYMBOL
POWER FACTOR CONTROLLER
NOISE FILTER
VARISTOR
NF
MF
PFC
NR63
CURRENT TRANSFORMER
CURRENT TRANSFORMER
FUSE (250V 1A)
FUSE (250V 3.15A)
F911
F801
CT61
CT1, 2
DISCHARGE TEMPERATURE THERMISTOR
RESISTOR
R64 RESISTOR
R934A, B
FUSE (250V 3.15A)
FET ARRAY
F912
HC932
FIN TEMPERATURE THERMISTOR
RESISTOR
DEFROST THERMISTOR
RT62
RT61
RT65
RS1~4
EXPANSION VALVE COIL
HIGH PRESSURE SWITCH
REACTOR
POWER TRANSISTOR MODULE
L
IPM
LEV
HPS
7
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT62
Discharge
temperature
thermistor
RT61
Flared connection
Stop valve
Stop valve
(with service port)
Capillary tube
[3.6✕[2.4✕50
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe [12.7 (MUZ-A18YV)
(with heat insulator) [15.88 (MUZ-A24YV)
Refrigerant pipe [6.35
(with heat insulator)
LEV
R.V. coil
heating ON
cooling OFF
Muffler
#100
Strainer
#100
Receiver
Outdoor heat
exchanger
temperature
thermistor
RT68
Strainer
#100
Outdoor
heat
exchanger
Flared connection
Defrost
thermistor
RT62
Discharge
temperature
thermistor
RT61
Flared connection
Stop valve
Stop valve
(with service port)
Capillary tube
[3.6✕[2.4✕50
Capillary tube
[1.8✕[0.6✕1000
Refrigerant flow in cooling
Compressor
4-way valve
Refrigerant flow in heating
Refrigerant pipe [15.88
(with heat insulator)
Refrigerant pipe [9.52
(with heat insulator)
LEV
R.V. coil
heating ON
cooling OFF
Oil separator
High-pressure
switch
Strainer
#100
Receiver
Outdoor
heat
exchanger
temperature
thermistor
RT68
Strainer
#100
Strainer
#100
REFRIGERANT SYSTEM DIAGRAM
MUZ-A18YV MUZ-A24YV -
OUTDOOR UNIT
E1
E1
Unit:mm
MUZ-A26YV -
E1
OUTDOOR UNIT
14
Unit:mm
MAX. REFRIGERANT PIPING LENGTH
Model
Piping size O.D : mm Length of connecting pipe : m
Refrigerant piping
Max. length : m
A
30
Indoor unit
Gas 0.43
Liquid 0.5
Gas
12.7
15.88
Liquid
6.35
9.52
MUZ-A18YV - E1
MUZ-A24YV - E1
MUZ-A26YV - E1
Outdoor unit
Gas 0
Liquid 0
Model
MUZ-A18YV -
E1
Refrigerant piping length (one way)
Outdoor unit
precharged
1,800
15m
160
20m
260
25m
360
30m
460
7m
0
10m
60
Model
MUZ-A24YV -
E1
Refrigerant piping length (one way)
15m
160
20m
260
25m
360
7m
0
10m
60
Outdoor unit
precharged
1,800
30m
460
Outdoor unit
precharged
2,000
0 165 440 715 990 1,265
Refrigerant piping length (one way)
15m10m7m
Model
MUZ-A26YV -
E1
20m
25m 30m
MAX. HEIGHT DIFFERENCE
Indoor
unit
w Max. Height
difference 15m
Refrigerant Piping
Max. length
A
Outdoor unit
w Height difference should be within 15m regardless of which unit, indoor or outdoor position is high.
ADDITIONAL REFRIGERANT CHARGE(R410A : g)
Calculation : Xg=20g/m ✕ (Refrigerant piping length (m)–7)
Calculation : Xg=20g/m ✕ (Refrigerant piping length (m)–7)
Calculation : Xg=55g/mo(Refrigerant piping length(m)-7)
15
PERFORMANCE CURVES8
MUZ-A18YV MUZ-A24YV MUZ-A26YV -
E1
E1
E1
The standard data contained in these specifications apply only to the operation of the air conditioner under normal conditions.
Since operating conditions vary according to the areas where these units are installed. The following information has been
provided to clarify the operating characteristics of the air conditioner under the conditions indicated by the performance curve.
(1) GUARANTEED VOLTAGE
207 ~ 253V, 50Hz
(2) AIR FLOW
Air flow should be set at MAX.
(3) MAIN READINGS
(1) Indoor intake air wet-bulb temperature : °C WB
(2) Indoor outlet air wet-bulb temperature : °C WB
(3) Outdoor intake air dry-bulb temperature : °C DB
(4) Total input : W
}
Cooling
(5) Indoor intake air dry-bulb temperature : °C DB
(6) Outdoor intake air wet-bulb temperature : °C WB
(7) Total input : W
}
Heating
Indoor air wet/dry-bulb temperature difference on the left side of the chart on this page and next page shows the difference between the indoor intake air wet/dry-bulb temperature and the indoor outlet air wet/dry-bulb temperature for your
reference at service.
How to measure the indoor air wet-bulb / dry-bulb temperature difference
1. Attach at least 2 sets of wet and dry-bulb thermometers to the indoor air intake as shown in the figure, and at least 2 sets of
wet and dry-bulb thermometers to the indoor air outlet. The thermometers must be attached to the position where air speed
is high.
2. Attach at least 2 sets of wet and dry-bulb thermometers to the outdoor air intake.
Cover the thermometers to prevent direct rays of the sun.
3. Check that the air filter is cleaned.
4. Open windows and doors of room.
5. Press the EMERGENCY OPERATION switch once (twice) to start the EMERGENCY COOL (HEAT) MODE.
6. When system stabilizes after more than 15 minutes, measure temperature and take an average temperature.
7. 10 minutes later, measure temperature again and check that the temperature does not change.
11.4
10.5
9.5
8.6
7.7
difference (degree)
6.8
Indoor air Wet-bulb temperature
INDOOR UNIT
Wet and dry-bulb
thermometers
11.3
10.3
9.3
8.4
7.5
6.7
12.9
11.7
10.6
11.1
10.2
9.2
8.3
7.5
6.6
9.6
8.6
7.6
13.9
12.7
11.4
10.3
9.2
8.1
Indoor intake air W
et-bulb tem
perature (
:
)
Outdoor intake air Dry-bulb temperature (:)
OUTDOOR UNIT
Wet and dry-bulb
thermometers
:)
Indoor intake air Wet-bulb temperature (
Outdoor intake air Dry-bulb temperature (:)
MCFZ-A18WV - E1
MUZ-A18YV - E1
Rated frequency 84Hz
MSZ-A24YV - E1
MUZ-A24YV - E1
MSZ-A18YV - E1
MUZ-A18YV - E1
Rated frequency 73Hz
Rated frequency 88Hz
MCFZ-A24WV - E1
MUZ-A24YV - E1
Rated frequency 102Hz
MSZ-A26YV - E1
MUZ-A26YV - E1
Rated frequency 63Hz
16
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