Mitsubishi MXZ-8B140VA Operating manual

TECHNICAL & SERVICE MANUAL
SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS
CONTENTS
1. SAFETY PRECAUTION ······································ 2
2. OVERVIEW OF UNITS········································ 5
3. SPECIFICATIONS ············································· 12
4. DATA·································································· 13
5. OUTLINES AND DIMENSIONS ························ 17
6. WIRING DIAGRAM············································ 18
7. NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION ··· 20
8. TROUBLESHOOTING······································· 22
9. ELECTRICAL WIRING ······································ 56
10. WIRING SPECIFICATIONS.······························ 58
11. SYSTEM CONTROL ·········································· 59
12. REFRIGERANT PIPING TASK·························· 61
13. DISASSEMBLY PROCEDURE·························· 64
INDOOR UNITS COMBINATION SHEETS
No. OCH480
REVISED EDITION-D
[Service Ref.]
MXZ-8B140VA
MXZ-8B160VA
MXZ-8B140YA
MXZ-8B160YA
HFC
utilized
R410A
March 2014
NOTE:
• Thisservicemanual
describestechnicaldata
ofoutdoorunit.Asfor
indoorunitsandbranch
box(OCH508),refertoits
servicemanual.
•RoHScompliantproducts
have<G>markonthespec
nameplate.
OUTDOOR UNIT
Modelname
indication
PARTS CATALOG (OCB480)
Revision:
• Addedconnectableindoorunit
 MFZ-KJ25VE,
 MFZ-KJ35VE,and
 MFZ-KJ50VEinREVISED
EDITION-D.
•Somedescriptionshave
beenmodified.
•PleasevoidOCH480
REVISEDEDITION-C.
<Outdoor unit>
[Model Name]
MXZ-8B140VA
MXZ-8B160VA
MXZ-8B140YA
MXZ-8B160YA

2
1SAFETY PRECAUTION
Cautions for units utilizing refrigerant R410A
1-1. ALWAYS OBSERVE FOR SAFETY
Use new refrigerant pipes.
Charge refrigerant from liquid phase of gas
cylinder.
If the refrigerant is charged from gas phase, composition
change may occur in refrigerant and the efficiency will be
lowered.
Do not use refrigerant other than R410A.
If other refrigerant (R22 etc.) is used, chlorine in refrige-
rant can cause deterioration of refrigerant oil etc.
Use a vacuum pump with a reverse flow check
valve.
Vacuum pump oil may flow back into refrigerant cycle and
that can cause deterioration of refrigerant oil etc.
Use the following tools specifically designed for
use with R410A refrigerant.
The following tools are necessary to use R410A refrigerant.
Handle tools with care.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
Do not use a charging cylinder.
If a charging cylinder is used, the composition of refrigera-
nt will change and the efficiency will be lowered.
Flare tool
Electronic refrigerant
charging scale
Vacuum pump adaptor
Size adjustment gauge
Gauge manifold
Torque wrench
Gas leak detector
Charge hose
Tools for R410A
Contamination inside refrigerant piping can cause deterio-
ration of refrigerant oil etc.
If dirt, dust or moisture enters into refrigerant cycle, that can
cause deterioration of refrigerant oil or malfunction of com-
pressor.
If large amount of mineral oil enters, that can cause deterio-
ration of refrigerant oil etc.
Store the piping indoors, and both ends of the
piping sealed until just before brazing.
(Leave elbow joints, etc. in their packaging.)
Make sure that the inside and outside of refrige-
rant piping is clean and it has no contaminants
such as sulfur, oxides, dirt, shaving particles, etc,
which are hazard to refrigerant cycle.
In addition, use pipes with specified thickness.
The refrigerant oil applied to flare and flange
connections must be ester oil, ether oil or
alkylbenzene oil in a smalll amount.
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.
Use the specified refrigerant only.
Ventilate the room if refrigerant leaks during
operation. If refrigerant comes into contact with
a flame, poisonous gases will be released.
1-2. CAUTIONS RELATED TO NEW REFRIGERANT
Before obtaining access to terminal, all supply
circuit must be disconnected.
OCH480D

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Gravimeter
Unit
[3] Service tools
(1) Use the below service tools as exclusive tools for R410A refrigerant.
[2] Additional refrigerant charge
When charging directly from cylinder
·CheckthatcylinderforR410Aonthemarketissyphontype.
·Chargingshouldbeperformedwiththecylinderofsyphonstoodvertically.(Refrigerantischargedfromliquidphase.)
[1] Cautions for service
(1) Perform service after recovering the refrigerant left in unit completely.
(2) Do not release refrigerant in the air.
(3) After completing service, charge the cycle with specified amount of refrigerant.
(4) When performing service, install a filter drier simultaneously.
Be sure to use a filter drier for new refrigerant.
No. Toolname Specifications
1Gaugemanifold
·OnlyforR410A
·Usetheexistingfittingspecifications.(UNF1/2)
·Usehigh-tensionsidepressureof5.3MPa·Gorover.
2Chargehose ·OnlyforR410A
·Usepressureperformanceof5.09MPa·Gorover.
3Electronicscale
4Gasleakdetector ·UsethedetectorforR134a,R407CorR410A.
5Adaptorforreverseflowcheck ·Attachonvacuumpump.
6Refrigerantchargebase
7Refrigerantcylinder ·OnlyforR410A·Topofcylinder(Pink)
·Cylinderwithsyphon
8Refrigerantrecoveryequipment
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(2) Cautions for refrigerant piping work
NewrefrigerantR410Aisadoptedforreplacementinverterseries.AlthoughtherefrigerantpipingworkforR410Aissame
asforR22,exclusivetoolsarenecessarysoasnottomixwithdifferentkindofrefrigerant.Furthermoreastheworking
pressureofR410Ais1.6timeshigherthanthatofR22,theirsizesofflaredsectionsandflarenutsaredifferent.
1Thicknessofpipes
BecausetheworkingpressureofR410AishighercomparedtoR22,besuretouserefrigerantpipingwiththickness
shownbelow.(Neverusepipesof0.7mmorbelow.)
2Dimensionsofflarecuttingandflarenut
ThecomponentmoleculesinHFCrefrigerantaresmallercomparedtoconventionalrefrigerants.Inadditiontothat,
R410Aisarefrigerant,whichhashigherriskofleakagebecauseofitsworkingpressurehigherthanthatofotherrefriger-
ants.Therefore,toenhanceairtightnessandintensity,flarecuttingdimensionofcopperpipeforR410Ahasbeenspeci-
fiedseparatelyfromthedimensionsforotherrefrigerantsasshownbelow.ThedimensionBofflarenutforR410Aalso
haspartlybeenchangedtoincreaseintensityasshownbelow.Setcopperpipecorrectlyreferringtocopperpipeflaring
dimensionsforR410Abelow.For1/2”and5/8”,thedimensionBchanges.
Usetorquewrenchcorrespondingtoeachdimension.
3ToolsforR410A(Thefollowingtableshowswhetherconventionaltoolscanbeusedornot.)
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
0.8
0.8
0.8
1.0
—
0.8
0.8
0.8
1.0
1.0
Nominal
dimensions(inch)
Diagram below: Piping diameter and thickness
Outside
diameter (mm)
Thickness (mm)
R410A R22
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
9.1
13.2
16.6
19.7
—
9.0
13.0
16.2
19.4
23.3
Nominal
dimensions (inch)
Flare cutting dimensions
Outside
diameter
Dimension A ( )
+0
-0.4
(mm)
R410A R22
(mm)
1/4
3/8
1/2
5/8
3/4
6.35
9.52
12.70
15.88
19.05
17.0
22.0
26.0
29.0
—
17.0
22.0
24.0
27.0
36.0
Nominal
dimensions (inch)
Flare nut dimensions
Outside
diameter
Dimension B (mm)
R410A R22
(mm)
Gauge manifold
Charge hose
Gas leak detector
Refrigerant recovery equipment
Refrigerant cylinder
Applied oil
Safety charger
Charge valve
Vacuum pump
Flare tool
Bender
Pipe cutter
Welder and nitrogen gas cylinder
Refrigerant charging scale
Vacuum gauge or thermis-
tor vacuum gauge and
vacuum valve
Charging cylinder
Air purge, refrigerant charge
and operation check
Gas leak check
Refrigerant recovery
Refrigerant charge
Apply to flared section
Prevent compressor malfunction
when charging refrigerant by
spraying liquid refrigerant
Prevent gas from blowing out
when detaching charge hose
Vacuum drying and air
purge
Flaring work of piping
Bend the pipes
Cut the pipes
Weld the pipes
Refrigerant charge
Check the degree of vacuum. (Vacuum
valve prevents back flow of oil and refri-
gerant to thermistor vacuum gauge)
Refrigerant charge
Tool exclusive for R410A
Tool exclusive for R410A
Tool for HFC refrigerant
Tool exclusive for R410A
Tool exclusive for R410A
Ester oil and alkylbenzene
oil (minimum amount)
Tool exclusive for R410A
Tool exclusive for R410A
Tools for other refrigerants can
be used if equipped with adap-
ter for reverse flow check
Tools for other refrigerants
can be used by adjusting
flaring dimension
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants can be used
Tools for other refrigerants
can be used
Tool exclusive for R410A
Tools and materials Use R410A tools Can R22 tools be used?
(Usable if equipped
with adapter for rever-
se flow)
(Usable by adjusting
flaring dimension)
Can R407C tools be used?
Ester oil:
Alkylbenzene oil: minimum amount
(Usable if equipped
with adapter for rever-
se flow)
(Usable by adjusting
flaring dimension)
: Prepare a new tool. (Use the new tool as the tool exclusive for R410A.)
: Tools for other refrigerants can be used under certain conditions.
: Tools for other refrigerants can be used.
DimensionA
DimensionB
OCH480D

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2OVERVIEW OF UNITS
2-1. CONSTRUCTION OF SYSTEM
MXZ-8B140YA/160YA
6HP
MXZ-8B140VA/160VA
5HP
14.0
16.0
15.5
18.0
R410A
Indoor unit
that can be
connected
Branch box
that can be
connected
Capacity
Refrigerant
Rated
capacity (kW)
Cooling
Heating
Number of units
Total system wide capacity
Type 15 ~ Type 100
2 ~ 8 units
1 ~ 2 units
21 ~ 132 % of outdoor unit capacity (3.0 kW ~ 18.5 kW) 19 ~ 130 % of outdoor unit capacity (3.0 kW ~ 20.2 kW)
Number of units
Outdoor unit
Ceiling
concealed
4-way
ceiling cassette
Wall
mounted
Model type Model name
Deluxe
Standard
Compact
Low static pressure
Middle static pressure
High static pressure
2 by 2 type
Standard
MSZ-FA25/35VA
MSZ-FB25/35/50VA(H)
MSZ-FD25/35/50VA
MSZ-FH25/35/50VE
MSZ-GA22/25/35/50/60/71/80VA
MSZ-GB50VA
MSZ-GC22/25/35VA
MSZ-GC22/25/35/50/60/71NA
MSZ-GE22/25/35/42/50/60/71/80VA
MSZ-SF25/35/42/50VE
MSZ-GE22/25/35/42/50/60/71NA
MSZ-GF60/71VE
MSZ-EF18/22/25/35/42/50VE
MSZ-SF15/20VA
SEZ-KA/KC25/35/50/60/71VA
SEZ-KD25/35/50/60/71VA(L)
PEAD-RP50/60/71/100JA(L)Q.UK
PEA-RP71EA/RP100EA2
MCFZ-GA35/50/60VA
SLZ-KA25/35/50VA(L)
PLA-RP35/50/60/71AA(.UK)/BA(.UK)
PLA-RP71BA2.UK
PLA-RP100BA/BA3
MFZ-KA25/35/50VA
MFZ-KJ25/35/50VE
MLZ-KA25/35/50VA
Floor standing
Capacity class (kW)
2.2 2.5 3.5 5.0 6.0 7.1 8.0 10.0*
Connectable indoor unit lineup (Heat pump inverter type)
<NOTE> The lineup of a connectable indoor unit depends on a district/areas/country.
* When connectiing the indoor unit with the number 100, use the PAC-AK52YP-E Y-shape connection pipe (Optional part).
Branch box PAC-AK53BC
5 branches
(MAX. 5 units)
PAC-AK32BC
3 branches
(MAX. 3 units)
Number of branches
Indoor unit that
can be connected
( )
Max. 2 branch boxes can be connected to 1 outdoor unit.
According to the connection method, you can choose the favorite one.
2- branch pipe (joint) : Optional parts
In case of using 1- branch box
In case of using 2- branch boxes
No need
Model name Connection method
flare
brazing
MSDD-50AR-E
MSDD-50BR-E
Option Optional accessories of indoor units and outdoor units are available.
CAUTION : The indoor unit which rated capability exceeds
10.0kW (100 type) can NOT be connected.
2.01.5 1.8 4.2
1-way ceiling cassette
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Indoor unit (Ceiling concealed type)
Indoor unit
(Wall mounted type)
Outdoor unit Branch Box
2-2. SYSTEM OUTLINE
TheadditionalconnectionoftheBranchBoxtogetherwithemploymentofthecompacttrunk-lookingoutdoorunitcan
successfullyrealizesalongdistancepipingforbighouses.Equippedwithamicroprocessor,theBranchBoxcantrans-
latethetransmissionsignalofindoorunitstoachievetheoptimumcontrol.
2-2-1. System example
2-2-2. Method for identifying
■ Outdoor unit
Model type
Power supply
V: Single phase 220/230/240V 50Hz
Y: 3-Phase 380/400/415V 50Hz
Multi type heat pump
inverter outdoor unit
Indicates equivalent to rated cooling capacity.
(O0.1kW)
Number of connectable indoor units (MAX.)
Control and refrigerant
A : New A control and R410A
Branch box (Controller)
Number of branches
5 : 5 branches
3 : 3 branches
Model type
Symbol of factory
Applicable refrigerant
A : R410A
(Indispensable)
Optional parts
M X Z – 8B140 V A
P A C – AK 5 3 BC
■ Branch box
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2-3. TYPICAL COMBINATION EXAMPLE
Branch box is located INSIDE of condominium
Branch box
(Inside)
Installing branch box indoors
Only1pipingisrequiredbetweentheoutdoorand
indoorofferingafineexternalview.
Branch box (5 branch type)
Outdoor unit
SEZ-60 MSZ-35 MSZ-35 MSZ-25 MSZ-25
Living Dining Bedroom (1) Bedroom (2)
Master
bedroom
■ System example of 5 indoor units
■ Verification
Theratedcapacityshouldbedeterminedbyobservingthetablebelow.Theunit’squantitiesarelimitedin2to8units.
Forthenextstep,makesurethattheselectedtotalratedcapacityisinarangeasshownbelow.
Thetotalindoorunitcapacityshouldbewithintheoutdoorunits.
Combinationofexcessiveindoorunitsandanoutdoorunitmayreducethecapacityofeachindoorunit.
Theratedindoorcapacityisasthetablebelow.
• MXZ-8B140 3.0 ~ 18.5 kW
• MXZ-8B160 3.0 ~ 20.2 kW
Example: MXZ-8B140
Total rated capacity
18.0 18.5kW
MSZ-25 =2.5
+
+
+
+
SEZ-60 =6.0
MSZ-35 =3.5
MSZ-35 =3.5
MSZ-25 =2.5
Indoorunittype(capacityclass) 15 18 20 22 25 35 42 50 60 71 80 100
Ratedcapacity(cooling)(kW) 1.5 1.8 2.0 2.2 2.5 3.5 4.2 5.0 6.0 7.1 8.0 10.0
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2-4. INSTALLATION
2-4-1. Outdoor unit installation location
 Forbestperformance,selectproperposition.
 ●Avoidplaceswherecombustiblegasmaybegeneratedorleak.
 ●Avoiddirectsunlightorothersourcesofheat.
 ●Installsunshadetoprotecttheoutdoorunitifdirectsunlighthitstheunit.
 ●Installtheoutdoorunitwithenoughdistancebetweenneighboursasoperationnoisemaydisturbtheneighbours.
 ●Avoidthepositionthattheunitiscoveredbysnoworsnowblowsdirectlyagainsttheairoutlet.Thesnowblockorblowwill
reducetheairflowoftheoutdoorunit.
Intheareasofheavysnow,specialcountermeasuresmustbetakenatinstallationtoprotecttheoutdoorunitfrommalfunc-
tioncausedbysnow.
 ●Selectalocationpermittingeasywiringandpipeaccesstothepowersourceandindoorunit.
 ●Drainwatermustbedrainedfreelyduringoperation.Checkfordraining.
2-4-2. Ventilation and service space
(1) Windy location installation
Wheninstallingtheoutdoorunitonarooftoporotherlocationunprotectedfromthewind,situatetheairoutletoftheunitso
thatitisnotdirectlyexposedtostrongwinds.Strongwindenteringtheairoutletmayimpedethenormalairflowandamal-
functionmayresult.
Thefollowingshows3examplesofprecautionsagainststrongwinds.
 ●Facetheairoutlettowardsthenearestavailablewallabout50cmawayfromthewall.(Fig.2-1)
 ●Installanoptionalairguideiftheunitisinstalledinalocationwherestrongwindsfromatyphoon,etc.maydirectlyenter
theairoutlet.(Fig.2-2)
AAirguide
 ●Positiontheunitsothattheairoutletblowsperpendicularlytotheseasonalwinddirection,ifpossible.(Fig.2-3)
BWinddirection
Fig. 2-1
Fig. 2-2 Fig. 2-3
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(2) When installing a single outdoor unit
 Minimumdimensionsareasfollows,exceptforMax.,meaningMaximumdimensions,indicated.
 Refertothefiguresforeachcase.
 ●Obstaclesatrearonly(Fig.2-4)
 ●Obstaclesatrearandaboveonly(Fig.2-5)
  ·Donotinstalltheoptionalairoutletguidesforupwardairflow.
 ●Obstaclesatrearandsidesonly(Fig.2-6)
 ●Obstaclesatfrontonly(Fig.2-7)
  *Whenusinganoptionalairoutletguide,theclearanceis500mmormore.
 ●Obstaclesatfrontandrearonly(Fig.2-8)
  *Whenusinganoptionalairoutletguide,theclearanceis500mmormore.
 ●Obstaclesatrear,sides,andaboveonly(Fig.2-9)
  ·Donotinstalltheoptionalairoutletguidesforupwardairflow.
150
250
250
1500
500
Max. 500
1000
200
300
200
Fig. 2-4
Fig. 2-8Fig. 2-7
Fig. 2-5 Fig. 2-6
Fig. 2-9
unit : mm
300
1000
Max. 500
150
1000
OCH480D

10
(3) When installing multiple outdoor units
 Leave10mmspaceormorebetweentheunits.
 ●Obstaclesatrearonly(Fig.2-10)
 ●Obstaclesatrearandaboveonly(Fig.2-11)
  •Nomorethan3unitsmustbeinstalledsidebyside.Inaddition,leavespaceasshown.
  •Donotinstalltheoptionalairoutletguidesforupwardairflow.
 ●Obstaclesatfrontonly(Fig.2-12)
  *Whenusinganoptionalairoutletguide,theclearanceis1000mmormore.
 ●Obstaclesatfrontandrearonly(Fig.2-13)
  *Whenusinganoptionalairoutletguide,theclearanceis500mmormore.
 ●Singleparallelunitarrangement(Fig.2-14)
  *Whenusinganoptionalairoutletguideinstalledforupwardairflow,theclearanceis1000mmormore.
 ●Multipleparallelunitarrangement(Fig.2-15)
  *Whenusinganoptionalairoutletguideinstalledforupwardairflow,theclearanceis1500mmormore.
 ●Stackedunitarrangement(Fig.2-16)
  •Theunitscanbestackedupto2unitshigh.
  •Nomorethan2stackedunitsmustbeinstalledsidebyside.Inaddition,leavespaceasshown.
300
1500
500
1500
Max. 300
1000
600
2000
150
1500
500
1500
1500
800
150
1500
600
3000
500
Fig. 2-14Fig. 2-13
Fig. 2-12Fig. 2-11Fig. 2-10
Fig. 2-15
Fig. 2-16
unit : mm
OCH480D

11
2-5. SIMPLIFIED PIPING SYSTEM
Piping connection size
Liquid (mm)
Gas (mm)
{9.52
{15.88
The piping connection size differs according to the type and capacity of indoor units.
Match the piping connection size of branch box with indoor unit.
If the piping connection size of branch box does not match the piping connection size of
indoor unit, use optional different-diameter (deformed) joints to the branch box side.
(Connect deformed joint directly to the branch box side.)
A B
Flareconnectionemployed.(Nobrazing!)
A
B B B B B
Branch box
■Incaseofusing1-branchbox
Flareconnectionemployed(Nobrazing)
AA
A
B B B B B
2 branches pipe (joint)
: optional parts
Branch box #1
Branch box #2
■Incaseofusing2-branchboxes
■Installationprocedure(2branchpipe(joint))
RefertotheinstallationmanualsofMSDD-50AR-EandMSDD-50BR-E.
ForP100indoorunits,theindividualY-shapeconnectionpipesuse2portsonthebranchboxasshownbelow.
Port A
Port B
Port C
Port D
Port E
Indoor unit
(P100)
a
a
b
Y-shape connection pipe
Branch box
ToconnecttwoP100indoorunits,useportAandportB,and
portCandportDonthebranchbox.
Port A
Port B
Port C
Port D
Port E
Indoor unit
(P100)
a
a
a
a
b
Indoor unit
(P100)
b
Y-shape connection pipe
Y-shape connection pipe
Branch box
ToconnectasingleP100indoorunit,useportAandport
Bonthebranchbox.
OCH480D

12
3 SPECIFICATIONS
kW
W
kW
K
/min (CFM )
dB
dB
mm (in.)
mm (in.)
mm (in.)
kg (lbs)
kg (lbs)
L
mm
mm
External finish
Refrigerant control
Compressor
Model
Motor output
Starter type
Protection devices
Crankcase heater
Heat exchanger
Fan Fan (drive) oNo.
Fan motor output
Airflow
Defrost method
Noise level
Dimensions
Weight
Refrigerant
Charge
Oil (Model)
Pipe size O.D.
Connection method
Cooling
Heating
W
D
H
Liquid
Gas
Indoor side
Outdoor side
Notes1. Rating Conditions (ISO T1)
Cooling : Indoor : D.B. 27°C (80°F), W.B. 19°C (66°F) Outdoor : D.B. 35°C (95°F), W.B. 24°C (75°F)
Heating : Indoor : D.B. 20°C (68°F) Outdoor : D.B. 7°C (45°F), W.B. 6°C (43°F)
Refrigerant piping length (one way) : Main Piping (From outdoor unit to branch box) : 5m
Branch Piping (From branch box to each indoor units) : each 3m
2. Guaranteed operating range
Upper limit
Lower limit
Upper limit
Lower limit
M-series, S-series
D.B. 32°C, W.B. 23°C
D.B. 21°C, W.B. 15°C
D.B. 27°C
D.B. 20°C
P-series
D.B. 35°C, W.B. 22.5°C
D.B. 19°C, W.B. 15°C
D.B. 28°C
D.B. 17°C
Outdoor
D.B. 46°C
D.B. –5°C
D.B. 21°C, W.B. 15°C
D.B. –15°C, W.B. –15°C
Cooling
Heating
Service Ref.
OUTDOOR UNIT
REFRIGERANT PIPING
MXZ-8B140VA MXZ-8B160VA MXZ-8B140YA MXZ-8B160YA
Power supply (phase, cycle, voltage)
Breaker
Max. current (Outdoor unit only)
Conversion formula:
Conversion formula
kcal/h = kW o860
Btu/h = kW o3412
CFM = m3/min o35.31
[6.35mm
1/4 inch
[9.52mm
3/8 inch
[12.7mm
1/2 inch
[15.88mm
5/8 inch
[19.05mm
3/4 inch
Indoor
3. Guaranteed voltage
MXZ-8B140/160VA: 198~264V, 50Hz
MXZ-8B140/160YA: 342~456V, 50Hz
4. Above data are based on the indicated voltage.
MXZ-8B140/160VA: Single, 50Hz, 220/230/240V
MXZ-8B140/160YA: 3-phase, 50Hz, 380/400/415V
5. Refer to the service manual of indoor unit for the indoor unit's specifications.
14.0 15.5 14.0 15.5
17.62/16.85/16.15 21.63/20.69/19.82 5.93/5.63/5.43 7.24/6.87/6.63
3.86 4.71 3.86 4.71
99.6 99.0 98.9 98.9
16.0 18.0 16.0 18.0
3.87 4.77 3.87 4.77
17.68/16.91/16.21 21.90/20.95/20.08 5.95/5.65/5.44 7.32/6.95/6.70
99.5 99.0 98.9 99.0
2.9 3.3 2.9 3.3
100(3,530) 106(3,742) 100(3,530) 106(3,742)
50 51 50 51
52 54 52 54
7
14
7
14
Please refer to "9.ELECTRICAL WIRING"
29.5 13
Single, 50Hz, 220/230/240V 3-phase, 50Hz, 380/400/415V
Munsall 3Y 7.8/1.1
Linear Expansion Valve (In branch box)
Hermetic
ANB33FNBMT
ANB33FDSMT
Line start
HP switch, LP switch, Discharge thermo
-
Plate fin coil
Propeller fan × 2
0.060+0.060
Reverse cycle
950(37-3/8)
330+30(13+1-3/16)
1,350(53-1/8)
139(306)
129(284)
Flared
Flared
R410A
8.5(18.7),40m
2.3(FV50S)
[ 9.52
[ 15.88
Standard performance
Rated Cooling capacity
Rated power consumption *1
Operating current *1
Operating power factor *1
Starting current (Outdoor unit)
Rated Heating capacity
Rated power consumption *1
Operating current *1
Operating power factor *1
Starting current (Outdoor unit)
kW
kW
A
%
A
kW
kW
A
%
A
A
Heating Cooling
*1 Electrical data is only for outdoor unit.
MXZ-8B140VA MXZ-8B140YA
MXZ-8B160VA MXZ-8B160YA
OCH480D

13
4-1. COOLING AND HEATING CAPACITY AND CHARACTERISTICS
4-1-1. Method for obtaining system cooling and heating capacity:
Toobtainthesystemcoolingandheatingcapacityandtheelectricalcharacteristicsoftheoutdoorunit,firstadduptheratings
ofalltheindoorunitsconnectedtotheoutdoorunit(seetablebelow),andthenusethistotaltofindthestandardcapacitywith
thehelpofthetablesatthebackofthemanual"INDOORUNITSCOMBINATIONSHEETS".
(1) Capacity of indoor unit
4-1-2. Method for obtaining the heating and cooling capacity of an indoor unit:
(1) The capacity of each indoor unit (kW)=thecapacityA (orB)o
(2) Sample calculation (using the system described above in 4-1-1. (2) ):
modelcapacity
totalmodelcapacityofallindoorunits
During cooling: During heating:
•Thetotalmodelcapacityoftheindoorunitis:
2.5o2+5.0o2=15.0kW
Therefore,thecapacityofMSZ-EF25VEand
PEAD-RP50JAQwillbecalculatedasfollowsby
usingtheformulain4-1-2.(1):
Model25=14.0o=2.33kW
Model50=14.0o=4.67kW
•Thetotalmodelcapacityofindoorunitis:
2.5o2+5.0o2=15.0
Therefore,thecapacityofMSZ-EF25VEandPEAD-
RP50JAQwillbecalculatedasfollowsbyusingthe
formulain4-1-2.(1):
Model25=16.0o=2.67kW
Model50=16.0o=5.33kW
2.5
15.0
5.0
15.0
5.0
15.0
2.5
15.0
(2) Sample calculation
1 Systemassembledfromindoorandoutdoorunit(inthisexamplethetotalcapacityoftheindoorunitsisgreaterthanthatof
theoutdoorunit)
 •Outdoorunit MXZ-8B140VA
 •IndoorunitMSZ-EF25VEo2,PEAD-RP50JAQo2
2 Accordingtotheconditionsin1,thetotalcapacityoftheindoorunitwillbe:2.5o2+5.0o2=15.0
3 Thefollowingfiguresareobtainedfromthe150totalcapacityrowofthestandardcapacitydiagram(INDOORUNITS
COMBINATIONSHEETS:atthebackofthemanual).
Capacity(kW) Outdoorunitpowerconsumption(kW) Outdoorunitcurrent(A)/230V
Cooling Heating Cooling Heating Cooling Heating
A 14.0 B 16.0 5.22 5.01 22.9 22.0
4DATA
Modelnumber
forindoorunit
Model
15
Model
18
Model
20
Model
22
Model
25
Model
35
Model
42
Model
50
Model
60
Model
71
Model
80
Model
100
Modelcapacity 1.5 1.8 2.0 2.2 2.5 3.5 4.2 5.0 6.0 7.1 8.0 10.0
OCH480D

14
4-2. CORRECTING COOLING AND HEATING CAPACITY
4-2-1. Correcting Changes in Air Conditions
(1)Theperformancecurvecharts(Figure4-1,4-2,4-3,4-4)showthechangeratioofcapacityandinput(powerconsumption)
accordingtotheindoorandoutdoortemperatureconditionwhendefinetheratedcapacity(totalcapacity)andratedinput
underthestandardconditioninstandardpipinglength(5m)as“1.0”.
 •Standardconditions:
 •Usetheratedcapacityandratedpowervaluesgiveninthecharacteristicstableforeachindoorunit.
 •Thecapacityisthesinglevalueonthesideoftheoutdoorunit;
  Thecapacityonthesidesofeachindoorunitmustbeaddedtoobtainthetotalcapacity.
(2) Thecapacityofeachindoorunitmaybeobtainedbymultiplyingthetotalcapacityobtainedin(1)bytheratiobetweenthe
individualcapacityattheratedtimeandthetotalcapacityattheratedtime.
Individualcapacityattheratedtime
Individualcapacityunderstatedconditions=Totalcapacityunderthestatedconditionso
Totalcapacityattheratedtime
Rated cooling capacity
Rated heating capacity
Indoor D.B. 27 °C / W.B. 19 °C
Outdoor D.B. 35 °C
Indoor D.B. 20 °C
Outdoor D.B. 7 °C / W.B. 6 °C
-5 0 5 10 15 20 25 30 35 40 46
16
18
20
22
0.6
0.8
1
1.2
1.4
Cooling capacity ratio
Outdoor intake air dry-bulb temperature <:D.B. >
-5 0 5 10 15 20 25 30 35 40 46
16
18
20
22
0.4
0.6
0.8
1.0
1.2
Cooling input ratio
Outdoor intake air dry-bulb temperature <:D.B. >
Fig.4-1
Coolingcapacity
Fig.4-3
Heatingcapacity
Fig.4-4
Heatinginput
Fig.4-2
Coolinginput
Outdoorintakeairwet-bulbtemperature<:W.B.> Outdoorintakeairwet-bulbtemperature<:W.B.>
Indoorintakeairwet-bulbtemperature<:W.B.> Indoorintakeairwet-bulbtemperature<:W.B.>
Indoorintakeairdry-bulbtemperature<:D.B.>
Indoorintakeairdry-bulbtemperature<:D.B.>
Note :Thesediagramsshowthecasewheretheoperationfrequencyofacompressorisfixed.
(3)Capacitycorrectionfactorcurve
OCH480D

15
4-2-2. Correcting Capacity for Changes in the Length of Refrigerant Piping
Toobtaintheratio(andthecorrectedpipinglength)oftheoutdoorunitsratedcapacityandthetotalin-useindoorcapacity,first
findthecapacityratiocorrespondingtothestandardpipinglengthfromFig.4-5,Fig.4-6andthenmultiplybythecapacityfrom
Fig.4-1,4-2,Fig.4-3,4-4toobtaintheactualcapacity.
(2) Method for Obtaining the Corrected Piping Length
Correctedpipinglength=(Actualpipinglengthbetweenoutdoorunitandthefarthestindoorunit)+(0.30onumberofbendsinthepiping)(m)
2.2 (15.7%)
7.0 (50%)
10.5 (75%)
14.0 (100%)
18.5 (132%)
0.65 20 40 60 80
20 40 60 80
0.70
0.75
0.80
0.85
0.90
0.95
1.00
CoolingCapacity(ratio)[%]
Correctedpipinglength(m)
0.9
20 40 60 80
0.95
1
Heating
Capacity
(ratio)[%]
Correctedpipinglength(m)
Fig. 4-6 Heating capacity correction curve
MXZ-8B140VA, MXZ-8B140YA, MXZ-8B160VA, MXZ-8B160YA
2.5(16%)
7.8 (50%)
0.65 20 40 60 80
20 40 60 80
0.70
0.75
0.80
0.85
0.90
0.95
1.00
15.5 (100%)
20.2 (130%)
11.6 (75%)
(1) Capacity correction factor
Fig. 4-5 Cooling capacity correction curve
MXZ-8B140VA, MXZ-8B140YA MXZ-8B160VA, MXZ-8B160YA
Correctedpipinglength(m)
Totalratedcapacity
ofindoorunits(kW)
CoolingCapacity(ratio)[%]
Totalratedcapacity
ofindoorunits(kW)
OCH480D

16
1.5m
1m
MICROPHONE
UNIT
GROUND
4-3. NOISE CRITERION CURVES
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTER FREQUENCIES, Hz
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
MXZ-8B140VA
MXZ-8B140YA
COOLING
MODE
HEATING
50
SPL(dB)
52
LINE
90
80
70
60
50
40
30
20
10 63 125 250 500 1000 2000 4000 8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
OCTAVE BAND SOUND PRESSURE LEVEL, dB (0 dB = 0.0002 µbar)
BAND CENTER FREQUENCIES, Hz
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
MXZ-8B160VA
MXZ-8B160YA
COOLING
MODE
HEATING
51
SPL(dB)
54
LINE
OCH480D

17
5OUTLINES AND DIMENSIONS
MXZ-8B140VA MXZ-8B140YA MXZ-8B160VA MXZ-8B160YA unit : mm
Over
Over
Over
Over
Less than
Piping and wiring connections
can be made from 4 directions:
front, right, rear and below.
4 PIPING-WIRING DIRECTIONS
3 FOUNDATION BOLTS 2 SERVICE SPACE
1 FREE SPACE (Around the unit)
Please secure the unit firmly
with 4 foundation (M10) bolts.
(Bolts and washers must be
purchased locally.)
<Foundation bolt height>
Dimensions of space needed
for service access are
shown in the below diagram.
The diagram below shows a basic
example.
Explanation of particular details are
given in the installation manuals etc.
30
FOUNDATION
10
500
500 150
Service space
Over 150Over 1000
FREE
Over 10
Over 10
Example of Notes
1···Refrigerant GAS pipe connection (FLARE)[15.88(5/8 inch)
2···Refrigerant LIQUID pipe connection (FLARE)[9.52(3/8 inch)
Indication of STOP VALVE connection location
Terminal connection
Left ····Power supply wiring
Right ··Indoor/Outdoor wiring
Earth terminal
Handle for moving
Service panel
Handle for moving
2
1
A
1507
1423
23
950
322
1350
635371
Installation Feet
2-12×36 Oval holes
(Foundation Bolt M10)
2-U Shaped notched holes
(Foundation Bolt M10)
30 330
175 600 175
56
4270
37
5653
19370
417
28
Air Discharge
Side Air Intake
Rear Air Intake
Rear piping cover
Front piping cover
Bottom piping hole
(Knock-Out)
71
71
21981
14514514522030
Side Air Intake
Handle for moving
Handle for moving
Rear Air Intake
Handle for moving
Air Intake
( )
Drain hole( 5-[33)
Piping Knockout Hole Details
637323
5527
92
65
4045 Power supply wiring hole
(2-[27Knockout)
Rear trunking hole
(Knockout)
Rear piping hole
(Knockout)
[
92
9227
23
6373
4075
92
5519
Power supply wiring hole
(2-[27Knockout)
Right trunking hole
(Knockout)
Right piping hole
(Knockout)
[
92
63
73
23
5527
40 45
65
92
Power supply wiring hole
(2-[27Knockout)
Front trunking hole
(Knockout)
Front piping hole
(Knockout)
[
92
MODEL A
MXZ-8B140VA/160VA 1079
MXZ-8B140YA/160YA 930
OCH480D

18
6WIRING DIAGRAM
MXZ-8B140VA MXZ-8B160VA
Power turned on
LED on the controller board display the operation and inspection status as follows.
If LED does not light, it indicates that no power is supplied to the board:
Operation / Inspection Display
Normal status
Faulty status
(blinking)
Details
●WARNING:When the main supply is turned off, the voltage[340 V]in the main capacitor will drop to 20 V in approx. 2 minutes (input voltage : 240 V). when servicing, make sure that LED on the outdoor circuit board goes out,
and then wait for at least 1 minute.
●Components other than the outdoor board may be faulty : Check and take corrective action, referring to the service manual. Do not replace the outdoor board without checking.
Cautions when Servicing
Code
(blinks)
Operation status display,
such as C5. H7
F3
F5
F9
E8
E9
EA
Eb
Ec
E0 - E7
EE, EF
Ed
63L connector (red) is open.
63H connector (yellow) is open.
2 connectors (63H/63L) are open.
Branch box/outdoor communication error (Signal receiving error)(Outdoor unit)
Indoor/branch box communication error (Signal receiving error)(Branch box)
Branch box/outdoor communication error (Transmitting error)(Outdoor unit)
Indoor/branch box communication error (Transmitting error)(Branch box)
•Mis-Wiring of indoor-branch box / branch box-outdoor unit connecting wire.
•Too many indoor units / branch box are in the system.
Mis-wiring of indoor-branch box/branch box-outdoor unit connecting wire (converse wiring or disconnection)
Startup time over
Communication error except for outdoor unit
Combination errer, undefined error
Serial communication error
SYMBOL NAME
TB1
MC
MF1, MF2
21S4
SV1,SV2
63L
TH3
TH4
TH6
TH7
DCL
52C
CB
P. B.
63H
Terminal Block <Power Supply, Branch Box>
Motor for Compressor
Fan Motors
Solenoid Valve <Four-Way Valve>
Solenoid Valve <Bypass Valve>
High Pressure Switch
High Pressure Sensor
Low Pressure Switch
63HS
Thermistor <Outdoor Pipe>
Thermistor <Compressor>
Thermistor <Outdoor 2 - Phase Pipe>
Thermistor <Outdoor>
Reactor
52C Relay
Main Smoothing Capacitor
CY1,CY2 Capacitor
Power Circuit Board
LI / NI
EI,E2,E3,E4
F1 ~ F4
X51,X52,X54,X55
SW1
SW2
SW4
Connection Terminal <L / N - Phase>
P2,N2 Connection Terminal <CB>
DCL1,DCL2 Connection Terminal <DCL>
IGBT Power Module
Connection Terminal <Ground>
Controller Circuit Board
Fuse <T6.3AL250V>
Relay
Switch <Forced Defrost, Defect History
Record Reset>
Switch <Self Diagnosis Switch>
Switch <Test Operation>
Connection Terminal <U / V / W - Phase>
U / V / W
SW5 Switch <Function Switch>
SW6
SW7
SW8
SW9
SS
CN3S
CNIT
Switch <Model Select>
Switch <Function Setup>
Switch <Function Setup>
Switch <Function Setup>
CN31 Connector
LED3 Light Emitting Diode
<Operation Inspection Indicators>
Connector <Connection for Option>
Connector <Connection for Option>
CNDM Connector <Connected for Option
(Contact Input)>
CN51 Connector <Connection for Option>
Connector <Connection for Option>
C. B.
Details Code
U2
U7
U1
UL
U6
UF
UH
UP
U3
U4
U5
U8
U9
PA
Compressor temperature fault
Low-discharge superheating fault, Erroneous connection of refrigerant pipes or
the connecting wires
High pressure fault (63H operates)
Low pressure fault (63L operates)
Abnormality of power moduls
Compressor over current shutoff (Start up locked)
Current sensor fault (P. B.)
Compressor overcurrent shutoff fault
Compressor thermistor (TH4) open or short-circuit
Outdoor unit thermistors (TH3, TH6, TH7, and TH8), 63HS, and branch dox
thermistors open or short-circuit
Radiator panel temperature fault
Abnormality in outdoor fan motor
Voltage fault, current sensor fault
Forced compressor stop
(Overlap malfunction of drain pump in indoor unit
and linear expansion valve in branch box)
MODEL
140V
SW6
ON
OFF
12345678
160V
ON
OFF
12345678
MS
3~
MF1
1
3
1
7
CNF1
(WHT)
TRANS
MS
3~
MF2
17
CNF2
(WHT)
CNDC
(PNK)
2
4
1 1 2 12
TH7/6
(RED)
TH3
(WHT)
TH4
(WHT)
TH7
t° t° t° t°
TH6 TH3 TH4
3
1
63HS
63HS
(WHT)
63L
(RED)
31
63L
63H
(YLW)
31
63H
1 7
3 1
CNS
(WHT)
2
7
CN2
(WHT)
F3
1 2
1313
CNAC
(WHT)
CN4
(WHT)
12
34
F4
F2
F1 21S4
(GRN)
SV2
(BLU)
X52 X55
21S4 SV2
13 SV1
(GRY)
X54
SV1
13 SS
(WHT)
X51
1 14
CNM
(WHT)
1 3
3
CN52C
(RED)
15
CNIT
(RED)
P. B.
7
1
1 2
2
2
CN2
(WHT)
CN4
(WHT)
C. B.
DCL
LI
NI
N2
P2
U
U DCL2 DCL1
IGBT
CB
V
V
W
W
MC
RED
RED
WHT
WHT
BLK
MS
3~
1
3
CNDC
(PNK)
1
3
52C
52C
CNAC2
(RED)
CNAC1
(WHT)
E3
E2
BLK
BLK
BLK
BLK
EI
1 3
3
CN52C
(RED)
1
3
E4
BLU
S1NL S2 S3
YLW
ORN
GRN / YLW
BRN
RED
TB1
CY1
CY2
BRANCH BOX
POWER SUPPLY
~/N
220/230/240V 50H
Z
220V 60H Z
LED3
1
5
CN51
(WHT)
1
3
CNDM
(WHT)
1
3
CN3S
(WHT)
SW8 SW5
SW1
CN31
SW6
SW9SW2 SW7
SW4
w1
The black square ( ) indicates a switch position.
*1 MODEL SELECT
The black square ( ) indicates
a switch position.
OCH480D

19
MXZ-8B140YA MXZ-8B160YA
Power turned on
LED on the controller board display the operation and inspection status as follows.
If LED does not light, it indicates that no power is supplied to the board:
Operation / Inspection Display
Normal status
Faulty status
(blinking)
Details
● WARNING:When the main supply is turned off, the voltage[540 V]in the main capacitor will drop to 20 V in approx.5 minutes (input voltage : 380 V). when servicing, make sure that LED on the outdoor circuit board goes out,
and then wait for at least 5 minute.
● Components other than the outdoor board may be faulty : Check and take corrective action, referring to the service manual.
Do not replace the outdoor board without checking.
Cautions when Servicing
Code
(blinks)
Operation status display,
such as C5. H7
F3
F5
F9
E8
E9
EA
Eb
Ec
E0 - E7
EE, EF
Ed
63L connector (red) is open.
63H connector (yellow) is open.
2 connectors (63H/63L) are open.
Branch box/outdoor communication error (Signal receiving error)(Outdoor unit)
Indoor/branch box communication error (Signal receiving error)(Branch box)
Branch box/outdoor communication error (Transmitting error)(Outdoor unit)
Indoor/branch box communication error (Transmitting error)(Branch box)
•Mis-Wiring of indoor-branch box / branch box-outdoor unit connecting wire.
•Too many indoor units / branch box are in the system.
Mis-wiring of indoor-branch box/branch box-outdoor unit connecting wire (converse wiring or disconnection)
Startup time over
Communication error except for outdoor unit
Combination errer, undefined error
Serial communication error
SYMBOL NAME
TB1
MC
MF1, MF2
21S4
SV1,SV2
63L
TH3
TH4
TH6
TH7
CONV.B.
63H
Terminal Block <Power Supply>
TB2 Terminal Block <Branch Box>
Motor for Compressor
Fan Motors
Solenoid Valve <Four-Way Valve>
Solenoid Valve <Bypass Valve>
High Pressure Switch
Low Pressure Switch
Thermistor <Outdoor Pipe>
Thermistor <Compressor>
Thermistor <Outdoor 2 - Phase Pipe>
Thermistor <Outdoor>
ACL1~ACL4
CB1, CB2
CK
RS
Reactor
Capacitor
Rush Current Protect Resistor
Main Smoothing Capacitor
Controller Circuit Board
F1 ~ F4
X51,X52,X54,X55
SW1
SW2
SW4
Connection Terminal <Ground>
Controller Circuit Board
Fuse <T6.3AL250V>
Relay
Switch <Forced Defrost, Defect History
Record Reset>
Switch <Self Diagnosis Switch>
Switch <Test Operation>
52C Relay
TB-C1
X52A
Connection Terminal
TB-N1 Connection Terminal
IGBT Power Module
Connection Terminal
TB-P2
P. B. Power Circuit Board
TB-L1/L2/L3 Connection Terminal <L1/L2/L3-Power Supply>
Connection Terminal <U / V / W - Phase>
TB-U/V/W
GD1, GD3
N. F. Noise Filter Circuit Board
LO1/LO2/LO3/NO
Connection Terminal <L1/L2/L3/N-Power Supply>
Connection Terminal <L1/L2/L3/N-Power Supply>
Connection Terminal <L1-Power Supply>
LI1/LI2/LI3/NI
SW5 Switch <Function Switch>
SW6
SW7
SW8
SW9
SS
CN3S
CNIT
Switch <Model Select>
Switch <Function Setup>
Switch <Function Setup>
Switch <Function Setup>
CN31 Connector
LED3 Light Emitting Diode
<Operation Inspection Indicators>
Connector <Connection for Option>
Connector <Connection for Option>
CNDM Connector <Connected for Option
(Contact Input)>
CN51 Connector <Connection for Option>
Connector <Connection for Option>
C. B.
L1-A1 / IN
Connection Terminal <L1-Power Supply>
L1-A2 / OU
Connection Terminal <L2-Power Supply>
L2-A2 / OU
Connection Terminal <L3-Power Supply>
L3-A2 / OU
Connection Terminal <N-Power Supply>N-IN
Connection Terminal <CK>
CK-OU
Details Code
U2
U7
U1
UL
U6
UF
UH
UP
U3
U4
U5
U8
U9
PA
Compressor temperature fault
Low-discharge superheating fault, Erroneous connection of refrigerant pipes or
the connecting wires
High pressure fault (63H operates)
Low pressure fault (63L operates)
Abnormality of power moduls
Compressor over current shutoff (Start up locked)
Current sensor fault (P. B.)
Compressor overcurrent shutoff fault
Compressor thermistor (TH4) open or short-circuit
Outdoor unit thermistors (TH3, TH6, TH7), 63HS, and branch dox
thermistors open or short-circuit
Radiator panel temperature fault
Abnormality in outdoor fan motor
Voltage fault, current sensor fault
Forced compressor stop
(Overlap malfunction of drain pump in indoor unit
and linear expansion valve in branch box)
MODEL
140Y
SW6
ON
OFF
12345678
160Y
ON
OFF
12345678
CY1,CY2 Capacitor
High Pressure Sensor
63HS
MS
3~
MF1
1
3
1
7
CNF1
(WHT)
TRANS
MS
3~
MF2
17
CNF2
(WHT)
CNDC
(PNK)
2
4
1 1 2 12
TH7/6
(RED)
TH3
(WHT)
TH4
(WHT)
TH7
t° t° t° t°
TH6 TH3 TH4
3
1
63HS
63HS
(WHT)
63L
(RED)
31
63L
63H
(YLW)
31
63H
1 7
3 1
CNS
(WHT)
2
7
CN2
(WHT)
F3
1 2
1313
CNAC
(WHT)
CN4
(WHT)
12
34
F4
F2
F1 21S4
(GRN)
SV2
(BLU)
X52 X55
21S4 SV2
13 SV1
(GRY)
X54
SV1
IGBT
TB-W
TB-V
TB-U
TB-L3
13 SS
(WHT)
X51
1 14
CNM
(WHT)
LED3
15
CNIT
(RED)
1
5
CN51
(WHT)
1
3
CNDM
(WHT)
1
3
CN3S
(WHT)
SW8 SW5
SW1
CN31
SW6
SW9SW2 SW7
SW4
P. B.
7
1
7
CN2
(WHT)
CN7
(WHT)
1
2
2
CN4
(WHT)
1
2
2
2
CN5
(RED)
2
CNCT
(RED)
N. F.
CONV. B.
C. B.
RED
WHT
CNDC
(PNK)
CNL
(BLU)
131
3
11 3
13
CNAC2
(RED)
CNAC1
(WHT)
BLK
BLK
ACL4
ACL1
ACL2
ACL3
BLK
GD1
1
3
3
CN7
(WHT)
U
V
W
MC
RED
WHT
RED
RED
RED
RS
X52A
WHT
BLK
BLK
RED
RED RED
WHT
WHT
WHT WHT
BLK
BLK
MS
3~
TB-L2
TB-L1
TB-P2
CB1 CB2 CK
BLK
BRN
GD3
S1
N
L1
L2
L3
S2
S3
BLU
GRN/YLW
YLW
ORN
WHT
BRN
RED
BRANCH
BOX
TB1
TB2
POWER
SUPPLY
3N
~
380/400/415V
50H
Z
RED RED
BLK
BLU
BLU
1 3
3
TB-C1 TB-N1
L3-OU
BLK
L3-A2
L2-OU
L2-A2
L1-A1
LO1LI1
LO2LI2
LO3LI3
NONI
L1-IN
N-IN L1-OU
CK-OU L1-A2
2
CY1
CY2
w1
The black square ( ) indicates
a switch position.
*1 MODEL SELECT
The black square ( ) indicates a switch position.
OCH480D

20
7NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION
REFRIGERANT SYSTEM DIAGRAM
MXZ-8B140VA MXZ-8B140YA MXZ-8B160VA MXZ-8B160YA
Piping connection size
■Incaseofusing2-branchboxes
A
B B B B B
Branch box
AA
A
B B B B B
2 branches pipe (joint)
: optional parts
Branch box #1
Branch box #2
Thermistor TH6
(Pipe temperature : condenser)
Thermistor TH7
(Outdoor temperature)
Thermistor TH3
(Pipe temperature : liquid)
Strainer
#100
Strainer
#100
Oil separator
Low
pressure
switch
63L
High
pressure
switch
63H
Compressor
Thermistor TH4
(Compressor temperature)
Thermistor TH8
(Fin temperature)
Strainer
#100
Strainer
#50
Check valve
(High Pressure)
Check valve
(Low Pressure)
Capillary
tube3
Capillary
tube4
Capillary
tube2
Capillary
tube1
E
D
C
B
A
Strainer
#100
Condenser / evaporator
temperature thermistor
(TH5 or RT12)
Pipe temperature
thermistor / liquid
(TH2 or RT13)
Strainer
#100
Indoor units Branch box Outdoor unit
Thermistor (TH-A~E)
(Gas pipe temperature)
LEV A~E
(Linear expansion valve)
Room temperature
thermistor (TH1 or RT11)
Service port
Service port
Ball valve
Stop valve
Bypass valve(SV2)
Bypass valve (SV1)
High pressure sensor
discharge pressure sensor
63HS
Accumulator
4-way valve
Distributor
with Strainer
Refrigerant flow in cooling
Refrigerant flow in heating
Outdoor unit
MXZ-8B140VA
MXZ-8B160VA
MXZ-8B140YA
MXZ-8B160YA
PAC-AK53BC
PAC-AK32BC
Branch box
Capillary tube 1
(For return of oil
from oil separator)
Capillary tube 2
(For SV2)
Capillary tube 3
ahead of LEV
(in cooling mode)
Capillary tube 4
behind LEV
(in cooling mode)
[2.5 o[0.8 oL1000 [4 o[2.4 oL250
([4 o[2.4 oL140) o5 ([4 o[2.2 oL130) o5
([4 o[2.4 oL140) o3 ([4 o[2.2 oL130) o3
unit : mm
■Incaseofusing1-branchbox
Flareconnectionemployed(Nobrazing)
AB
Liquid(mm) {9.52
Gas(mm) {15.88
Thepipeconnectionsizediffersaccordingtothetypeandcapacityofindoorunits.
Matchthepipingconnectionsizeofbranchboxwithindoorunit.
Ifthepipingconnectionsizeofbranchboxdoesnotmatchthepipingconnectionsize
ofindoorunit,useoptionaldifferent-diameter(deformed)jointstothebranchboxside.
(Connectdeformedjointdirectlytothebranchboxside.)
■installationprocedure(2branchpipe(joint))
Refertotheinstallationmanualsof
MSDD-50AR-EandMSDD-50BR-E.
OCH480D