Mitsubishi Electric PAC-MK53BC Manuale operativo

March 2018

SPLIT-TYPE, HEAT PUMP AIR CONDITIONERS

TECHNICAL & SERVICE MANUAL

CONTENTS

1. SAFETY PRECAUTION ······································· 2

2. OVERVIEW OF UNIT ··········································· 5

3. SPECIFICATIONS ················································ 9

4. OUTLINES AND DIMENSIONS ···························10

5. WIRING DIAGRAM ············································· 12

. NECESSARY CONDITIONS FOR SYSTEM CONSTRUCTION·············

7. TROUBLESHOOTING ········································ 17

8. DISASSEMBLY PROCEDURE ··························· 26

BRANCH BOX

HFC

utilized

R410A

Note:

•Thisservicemanual

describestechnicaldataof

branchbox.Asforindoor

unitsandoutdoorunit,

refertoitsservicemanual.

PARTS CATALOG (OCB664)

[Service Ref.]

PAC-MK53BC

PAC-MK53BCB

PAC-MK33BC

PAC-MK33BCB

[Model Name]

PAC-MK53BC

PAC-MK53BCB

PAC-MK33BC

PAC-MK33BCB

PAC-MK53BC

No. OCH664

OCH664

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 keep 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 small 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.

OCH664

Electronic weighing scale

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

(1)CheckthatcylinderforR410Aonthemarketisasyphontype.

(2)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) If moisture or foreign matter might have entered the refrigerant piping during service, ensure to remove them.

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weighing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

OCH664

(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itsworkingpressurehigherthanthatofotherrefriger-

ants.Therefore,toenhanceairtightnessandstrength,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strengthasshownbelow.Setcopperpipecorrectlyreferringtocopperpipeflaring

dimensionsforR410Abelow.For1/2”and5/8”inchpipes,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

1.0

—

0.8

1.0

Nominal

dimensions (in)

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 (in)

Flare cutting dimensions

Outside

diameter (mm)

Dimension A ( )

-0.4 (mm)

R410A R22 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 (in)

Flare nut dimensions

Outside

diameter (mm

)Dimension B (mm)

R410A R22

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 for HFC refrigerant

Tool exclusive for R410A

Ester oil and alkylbenzene

oil (minimum amount)

Tool exclusive for R410A

Tools for other refrigerants can

be used if equipped with adop-

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

Tool exclusive for R410A

Tools and materials Use R410A tools Can R22 tools be used?

(Usable if equipped

with adopter for rever-

se flow)

(Usable by adjusting

flaring dimension)

Can R407C tools be used?

Ester oil:

Alkylbenzene oil: minimum amount

(Usable if equipped

with adopter 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

OCH664

2OVERVIEW OF UNIT

Indoor unit (Ceiling concealed type)

Indoor unit

(Wall mounted type)

Outdoor unit Branch box

2-1. SYSTEM OUTLINE

Theadditionalconnectionofthebranchboxtogetherwithemploymentofthecompacttrunk-lookingoutdoorunitcan

successfullyrealizealongdistancepipingforbighouses.Equippedwithamicroprocessor,thebranchboxcantranslate

thetransmissionsignalofindoorunitstoachievetheoptimumcontrol.

2-1-1. System example

2-1-2. Method for identifying

Branch box (Controller)

Number of branches

5: 5 branches

3: 3 branches

Model type

Piping connection

B: Brazing

None: Flare

P A C – MK 5 3 BC

(Indispensable)

Optional parts

Development No. : A, B, ···,etc.

Power supply

Single phase 220/230/240 V, 50 Hz

Multi type heat pump

inverter outdoor unit

Indicates equivalent to rated cooling capacity.

(kBTU/h)

Number of connectable indoor units (MAX.)

Control and refrigerant

A : New A control and R410A

M X Y-

100

4 C V A

■ Branch box

OCH664

2-2. INSTALLATION

2-2-1. Space required for Installation and servicing for branch box for PAC-MK53/33BC

(1) Front View (Fig. 2-1)

A Branchbox

B Onthesideofpiping

(2) Side View (Fig. 2-2, Fig. 2-3, Fig. 2-4)

C Forindoorinstallations

D Ceilingboard

E Maintenancehole

F Reactorbox(Optionalparts)

*1: Aminimum350mmisrequiredfor90°bendsinrefrigerantpiping.

*2: Ais“Min200mm”.

Inthecaseoflessthan200mm(forexampleAis100mm),theexchangeworkofbranchboxfromamaintenancehole

 becomesdifficult(OnlyexchangeworkofaPCB,linearexpansionvalvecoilsandsensorsispossible).

 Toinstalltheoptionalreactorbox,setAtoMin270mm<recommendation>.(Fig.2-4)

*3: Bis“600mm”.

 Inthecaseof“450mm”,prepareamaintenanceholeataPCBside(asitisshowninFig.2-3,Fig.2-4),and“Min300mm”

isneededasdistanceA.

 Inthecaseoflessthan300mm(forexampleAis100mm),theexchangeworkofBranchbox,linearexpansion

 valvecoilsandsensorsfromamaintenanceholebecomesdifficult.OnlyexchangeworkofaPCBispossible.

(3) Top View (Fig. 2-5)

NOTE1:Thebranchboxisonlyforindooruse.

NOTE2:Pleaseattachthespecialoptionalcover(PAC-AK350CVR-E)toinstallbranchboxoutdoors.

Fig. 2-5

Fig. 2-3

Fig. 2-2Fig. 2-1

Unit: mm

(3)

Min 250

(1) (2)

50 450

�

450

250 250 250

170 30

278

180-200

D E

E D

450

E D

Fig. 2-4

OCH664

2-2-2. Space required for Installation and servicing for branch box for PAC-MK53/33BCB

(1) Front View (Fig. 2-6)

A Branchbox

B Onthesideofpiping

(2) Side View (Fig. 2-7, Fig. 2-8, Fig. 2-9)

C Forindoorinstallations

D Ceilingboard

E Maintenancehole

*1: Aminimum350mmisrequiredfor90°bendsinrefrigerantpiping.

*2: Ais“Min.200mm”<recommendation>.

Inthecaseoflessthan200mm(forexampleAis100mm),theexchangeworkofbranchboxfromamaintenancehole

 becomesdifficult(OnlyexchangeworkofaPCB,linearexpansionvalvecoilsandsensorsispossible).

 Toinstalltheoptionalreactorbox,setAtoMin.270mm<recommendation>(Fig.2-9)

*3: Bis“600mm”.

 Inthecaseof“450mm”,prepareamaintenanceholeataPCBside(asitisshowninFig.2-8,Fig.2-9),and“Min.300

mm”isneededasdistanceA.

 Inthecaseoflessthan300mm(forexampleAis100mm),theexchangeworkofBranchbox,linearexpansion

 valvecoilsandsensorsfromamaintenanceholebecomesdifficult.OnlyexchangeworkofaPCBispossible.

(3) Top View (Fig. 2-10)

NOTE1:Thebranchboxisonlyforindooruse.

NOTE2:Pleaseattachthespecialoptionalcover(PAC-AK350CVR-E)toinstallbranchboxoutdoors.

Fig. 2-10

Fig. 2-8

Fig. 2-7Fig. 2-6

(3)

Min. 250

(1) (2)

50 450

�450

250

E D

250

250.3

170 30

278

180-200

Unit: mm

450

Fig. 2-9

OCH664

B B B B B

Branch box

■Incaseofusing1-branchbox

Flareconnectionemployed

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.

2-3. 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

OCH664

3 SPECIFICATIONS

Model Name

Connectable number of indoor units

Power supply (from outdoor unit)

Input

Running current

External finish

Dimensions

Weight

Piping

connection

(Flare)

Width

Depth

Height

Branch (indoor side)*

Main (outdoor side)

Liquid

Gas

Liquid

Gas

Maximum 3

6.7

[6.35 O 3 {A,B,C}

[9.52 O 3 {A,B,C}

Maximum 5

7.4

[6.35 O 5 {A,B,C,D,E}

[9.52 O 4 {A,B,C,D}, [12.7 o1{E}

PAC-MK53BC PAC-MK33BC

~/N, 220/230/240 V, 50 Hz, ~/N, 220/230 V, 60 Hz

0.003

0.05 (Max. 6)

Galvanized sheets

450

280

170

[9.52

[15.88

PAC-MK53BC PAC-MK33BC

Thepipingconnectionsizediffersaccordingtothetypeandcapacityofindoorunits.Matchthepipingconnectionsizeforindoor

andbranchbox.Ifthepipingconnectionsizeofbranchboxdoesnotmatchthepipingconnectionsizeofindoorunits,use

optionaldifferent-diameter(deformed)jointstothebranchboxside.(Connectdeformedjointdirectlytothebranchboxside.)

Model Name

Connectable number of indoor units

Power supply (from outdoor unit)

Input

Running current

External finish

Dimensions

Weight

Piping

connection

(Brazing)

Width

Depth

Height

Branch (indoor side)*

Main (outdoor side)

Liquid

Gas

Liquid

Gas

Maximum 3

[6.35 O 3 {A,B,C}

[9.52 O 3 {A,B,C}

Maximum 5

[6.35 O 5 {A,B,C,D,E}

[9.52 O 4 {A,B,C,D}, [12.7 o1{E}

PAC-MK53BCB PAC-MK33BCB

~/N, 220/230/240 V, 50 Hz, ~/N, 220/230 V, 60 Hz

0.003

0.05 (Max. 6)

Galvanized sheets

450

280

170

[9.52

[15.88

7.0 6.5

Thepipingconnectionsizediffersaccordingtothetypeandcapacityofindoorunits.Matchthepipingconnectionsizeforindoor

andbranchbox.Ifthepipingconnectionsizeofbranchboxdoesnotmatchthepipingconnectionsizeofindoorunits,use

optionaldifferent-diameter(deformed)jointstothebranchboxside.(Connectdeformedjointdirectlytothebranchboxside.)

PAC-MK53BCB PAC-MK33BCB

OCH664

4OUTLINES AND DIMENSIONS

Unit: mm

PAC-MK53BC

PAC-MK33BC

{6.35

{9.52

SUSPENSION BOLT : W3/8(M10)

GAS PIPE

REFRIGERANT PIPE BRAZED CONNECTION

{6.35 {9.52

{9.52 {15.88

TO OUTDOOR UNIT

LIQUID PIPE A B C

{9.52

{6.35 DE

{6.35 {6.35

{9.52 {12.7

SUSPENSION BOLT PITCH

320

402

E D C B A

TO INDOOR UNIT

70 70

90450

67 72

7070

2525

252525

65 47

170

5-ELECTRIC WIRE INLET

BUSH

CONTROL COVER

SERVICE PANEL

(for LEV,THERMISTOR)

TO OUTDOOR UNIT

40280

112

7087

TERMINAL BLOCK

TO M-NET UNIT

TERMINAL BLOCK

TO INDOOR UNIT

TERMINAL BLOCK

TO OUTDOOR UNIT

TB2B

TB5

TB3ETB3CTB3A

TB3DTB3B

CAP

C B

CBA

TO INDOOR UNIT

450

65 47

170

209

2525

72 5-ELECTRIC WIRE INLET

BUSH

CONTROL COVER

TO OUTDOOR UNIT

SERVICE PANEL

(for LEV.THERMISTOR)

96 40

280

87 70

112

TB3A TB3C

TB3B

TB5 TB2B

TERMINAL BLOCK

TO OUTDOOR UNIT

TERMINAL BLOCK

TO INDOOR UNIT

TERMINAL BLOCK

TO M-NET UNIT

SUSPENSION BOLT PITCH

402

320

{6.35

{9.52

SUSPENSION BOLT : W3/8(M10)

GAS PIPE

REFRIGERANT PIPE BRAZED CONNECTION

{ 6.35 { 9.52

{9.52 {15.88

TO OUTDOOR UNIT

LIQUID PIPE A B C

{9.52

{6.35

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