Mitsubishi 1886268 User Manual

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3-2. PIPE CONNECTION

1)Applyathincoatofrefrigerationoil(G)tothearedendsofthepipesandthe

pipe connections of the outdoor unit.

2) Align the center of the pipe with that of the pipe connections of the outdoor unit,

thenhandtightenthearenut3to4turns.

3)Tightenthearenutwithatorquewrenchasspeciedinthetable.

• Over-tightening maycause damage to the arenut, resultingin refrigerant

leakage.

• Besuretowrapinsulationaroundthepiping.Directcontactwiththebarepiping

may result in burns or frostbite.

3-3. INSULATION AND TAPING

1)Coverpipingjointswithpipecover.

2)Foroutdoorunitside,surelyinsulateeverypipingincludingvalves.

3) Using piping tape (E), apply taping starting from the entry of outdoor unit.

• Stoptheendofpipingtape(E)withtape(withadhesiveagentattached).

• Whenpipinghavetobearrangedthroughaboveceiling,closetorwherethe

temperature and humidity are high, wind additional commercially sold insulation

topreventcondensation.

WARNING

When installing the unit, securely

connect the refrigerant pipes before

starting the compressor.

CAUTION

When there are the ports which are

not used, make sure their nuts are

tightened securely.

Fig. 1 Fig. 2 Fig. 3

Fig. 4 Fig. 5 Fig. 6

TiltedUnevenBurred

Good

No good

Burr

Copper pipe

Spare reamer

Pipe cutter

Smooth all

around

Evenlength

all around

Inside is shin-

ing without any

scratches.

Flare nut

Die

Copper pipe

Clutch type

Flaring tool

Wing nut type

Copper

pipe

Pipe diameter

[inch (mm)]

B

[inch (mm)]

A [inch (mm)] Tightening torque

Clutch type tool for R410A Clutch type tool for R22 Wing nut type tool for R22 ft-Ib N•m kgf•cm

1/4 (ø6.35) 21/32 (17)

0 to 0.02

(0 to 0.5)

0.04 to 0.06

(1.0 to 1.5)

0.06 to 0.08

(1.5 to 2.0)

10 to 13 13.7 to 17.7 140 to 180

3/8 (ø9.52) 7/8 (22) 25 to 30 34.3 to 41.2 350 to 420

1/2 (ø12.7) 1-1/32 (26)

0.08 to 1.0

(2.0 to 2.5)

36 to 42 49.0 to 56.4 500 to 575

5/8 (ø15.88) 1-5/32 (29) 54 to 58 73.5 to 78.4 750 to 800

3-1. FLARING WORK

1) Cut the copper pipe correctly with pipe cutter. (Fig. 1, 2)

2)Completelyremoveallburrsfromthecutcrosssectionof

pipe. (Fig. 3)

• Aimthecopperpipedownwardwhileremovingburrsto

preventburrsfromdroppinginthepipe.

3)Removearenutsattachedtoindoorandoutdoorunits,

thenputthemonpipehaving completedburrremoval.

(Notpossibletoputthemonafteraringwork.)

4)Flaringwork (Fig.4,5).Firmly holdcopperpipe in the

dimension shown in the table. Select A inch (mm) from

the table according to the tool selected.

5)Check

• ComparethearedworkwithFig.6.

• Ifareisnotedtobedefective,cutoffthearedsection

anddoaringworkagain.

4-1.PURGINGPROCEDURESANDLEAKTEST

1)Removeserviceportcapofstopvalveonthesideoftheoutdoorunitgaspipe.

(Thestopvalvesarefullyclosedandcoveredincapsintheirinitialstate.)

2)Connectgaugemanifoldvalveandvacuumpumptoserviceportofstopvalve

on the side of the outdoor unit gas pipe.

3)Runthevacuumpump.(Vacuumizeformorethan15minutes.)

4)Check thevacuum withgauge manifold valve,then closegauge manifold

valve,andstopthevacuumpump.

5)Leaveasitisforoneortwominutes.Makesurethepointerofgaugemanifold

valveremainsinthesameposition.Conrmthatpressuregaugeshows-14.7

psi[Gauge](-0.101MPa).

6)Removegaugemanifoldvalvequicklyfromserviceportofstopvalve.

7)Fullyopenallstopvalvesonthegaspipeandtheliquidpipe.Operatingwithout

fully opening lowers the performance and this causes trouble.

8)Referto1-2.,andchargetheprescribedamountofrefrigerantifneeded.Be

sure to charge slowly with liquid refrigerant. Otherwise, composition of the

refrigerant in the system may be changed and affect performance of the air

conditioner.

9)Tightencapofserviceporttoobtaintheinitialstatus.

)Leaktest

3. FLARING WORK AND PIPE CONNECTION

4. PURGINGPROCEDURES,LEAKTEST,ANDTESTRUN

Stopvalve

forGAS

Stopvalvecap

(Torque 19.6 to

29.4N•m,200

to300kgf•cm)

Gaugemanifold

valve(forR410A)

Compound pressure

gauge (for R410A)

–0.101MPa

(–760mmHg)

Handle

Low

HandleHigh

Vacuumpump

(for R410A)

*Close

*Open

Hexagonalwrench

*4 to 5 turns

Stopvalve

forLIQUID

Pressure gauge

(for R410A)

Precautions when us-

ingthecontrolvalve

Whenattachingthecontrolvalve

totheserviceport,valvecoremay

deform or loosen if excess pres-

sure is applied. This may cause

gasleak.

Serviceport

Charge hose

(for R410A)

Body

Open

Control

valve

Whenattachingthecontrolvalveto

theserviceport,makesurethatthe

valvecoreisinclosedposition,and

then tighten part A. Do not tighten

partAorturnthebodywhenvalve

core is in open position.

Serviceportcap

(Torque 13.7 to

17.7N•m,140 to

180kgf•cm)

Charge hose

(for R410A)

BH79A325H03_en.indd 5 2018/08/06 13:12:25

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Mitsubishi 1886268 20000 BTU Dual-Zone Mini Split System 9+9 with Wall Mount Indoor Unit, 20 SEER, 12.7 EER, Wireless Remote Controller, AHRI Certified, cETLus Certification, DC Inverter Technology

User Manual - Page 6