1887873 User Manual

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Fig.5-8

A Refrigerant pipe and insulating material

(Procurelocally)

B Pipecover(large)(Accessory)

C Pipecover(small)(Accessory)

D Refrigerantpipe(gas)

E Refrigerantpipe(liquid)

F Band(Accessory)

G Cross-sectionalviewofconnection

H Refrigerant pipe

I Insulating material

J Squeeze

B,C

5. Refrigerantpipingwork

5.4. Refrigerantanddrainagepipinglocations(Fig.5-7)

A Drain pipe

B Ceiling

C Grille

D Refrigerantpipe(liquid)

E Refrigerantpipe(gas)

F Mainunit

Model

Dimension(mm,inch)

A(liquid) B(gas)

SLZ-KF09

SLZ-KF12

63,2-15/32 72,2-27/32

SLZ-KF15

SLZ-KF18

63,2-15/32 78,3-1/16

5.5. Pipeconnection(Fig.5-8)

Indoorunit

1) Whenusingcommerciallyavailablecopperpipes:

• Applythinlayerofrefrigerantoiltopipeandjointseatingsurfacebeforetightening

arenut.

• Usetwowrenchestotightenpipingconnections.

• Air-purgetherefrigerantpipingusingyourownrefrigerantgas(don’tair-purgethe

refrigerantchargedintheoutdoorunit).

• Use leak detectoror soapy water to check for gas leaks after connections are

completed.

• Usearednutinstalledtothisindoorunit.

• Incaseofreconnectingtherefrigerantpipesafterdetaching,makethearedpart

ofpipere-fabricated.

• Userefrigerantpipinginsulationprovidedtoinsulateindoorunitconnections.Insulate

carefully following shown below.

2) Heatinsulationforrefrigerantpipes:

1 Wraptheenclosedlarge-sizedpipecoveraroundthegaspipe,makingsurethat

theendofthepipecovertouchesthesideoftheunit.

2 Wraptheenclosedsmall-sizedpipecoveraroundtheliquidpipe,makingsurethat

theendofthepipecovertouchesthesideoftheunit.

3 Securebothendsofeachpipecoverwiththeenclosedbands.(Attachthebands

20mm(25/32inch)fromtheendsofthepipecover.)

Makesurethattheslitinthepipecoverisfacingupwardwhenitisinstalled.

Seethatstopvalveonoutdoorunitisfullyshut(unitisshippedwithvalveshut).After

allpipingconnectionsbetweenindoorandoutdoorunithavebeencompleted,vacuum-

purgeairfromsystemthroughtheserviceportforthestopvalveontheoutdoorunit.

Aftercompletingproceduresabove,openoutdoorunitstopvalvesstemfully.This

completes connection of refrigerant circuit between indoor and outdoor units. Stop

valveinstructionsaremarkedonoutdoorunit.

Flarenuttightening

• Applyathincoatofrefrigerationoilontheseatsurfaceofpipe.(Fig.5-9)

• Forconnectionrstalignthecenter,thentightentherst3to4turnsofarenut.

• Usetightening torque tablebelowas aguidelinefor indoor unitsideunion joint

section,andtightenusingtwowrenches.Excessivetighteningdamagestheare

section.

AApplyrefrigeratingmachineoilovertheentireareseatsurface.

BUsecorrectarenutsmeetingthepipesizeoftheoutdoorunit.

CFlarenuttighteningtorque

Copper pipe O.D.

(mm,inch)

Flare nut O.D.

(mm,inch)

Tighteningtorque

(N·m,ft·lbs)

ø6.35,1/4 17,21/32 14to18,10to13

ø9.52,3/8 22,7/8 34to42,25to31

ø12.7,1/2 26,1-1/32 49to61,36to45

Fig.5-7

3-1/16(gas)

2-15/32(liquid)

(inch)

1/4 7-23/32 7-23/32

7-13/32

5-1/4 2-23/32

2-17/32

Fig.5-9

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User Manual - Page 6