Mitsubishi Electric MXZ-5B100VA Installation Manual download pdf (Page 6)

Fig. 1 Fig. 2

Fig. 3 Fig. 4

Fig. 5 Fig. 6

3. FLARING WORK AND PIPE CONNECTION

3-1. FLARING WORK

Pipe diameter

(mm)

Nut

(mm)

A (mm) Tightening torque

Clutch

typetool

for R410A

Clutch

typetool

for R22

Wing nut

typetool

for R22

N•m kgf•cm

ø6.35 (1/4”)

0 to 0.5 1.0 to 1.5

1.5 to 2.0

13.7to17.7 140 to 180

ø9.52(3/8”)

22 34.3 to 41.2 350 to 420

ø12.7(1/2”)

26 2.0 to 2.5 49.0to56.4 500to575

ø15.88 (5/8”)

29 - 73.5to78.4 750to800

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

3-2. PIPE CONNECTION

• Fastenarenutwithatorquewrenchasspeciedinthetable.

• When fastenedtootight, arenutmay brakeaftera longperiodand

cause refrigerant leakage.

Outdoor unit connection

Connect pipes to stop valve pipe joint of the outdoor unit in the same

manner applied for indoor unit.

• For tightening, use a torque wrench or spanner and use the same

tightening torque applied for indoor unit.

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 at

tached).

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

wherethetemperatureandhumidityarehigh,windadditionalcom

merciallysoldinsulationtopreventcondensation.

Service port cap

(Torque13.7to

17.7N•m,140 to

180 kgf

•cm)

4-1. PURGING PROCEDURES AND LEAK TEST

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)

Charge hose

(for R410A)

*Close

*Open

Hexagonal wrench

*4to5turns

Stop valve

for LIQUID

4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN

Pressure gauge

(for R410A)

Precautions when using

the control valve

When attaching the control valve to

theserviceport,valvecoremayde-

form or loosen if excess pressure 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.

Copper

pipe

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)

• Puttheendofthecopperpipetodownwarddirectionasyou

remove burrs in order to avoid to let burrs drop in the piping.

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 mm from the table according to the tool

youuse.

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.

1) Remove service port cap of stop valve on the side of the outdoor unit

gas pipe. (The stop valve will not work in its initial state fresh out of the

factory,totallyclosedwithcapon.)

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

stop valve on the gas pipe side of the outdoor unit.

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

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

fold valve, and stop the vacuum pump.

5) Leave as it is for one or two minutes. Make sure pointer gauge mani

foldvalveremainsinthesameposition.Conrmthatpressuregauge

shows–0.101MPa[Gauge](–760mmHg).

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

7)After refrigerant pipes are connected and evacuated, fully open all

stop valves on both sides of gas pipe and liquid pipe. Operating with

outfullyopeninglowerstheperformanceandthiscausestrouble.

8) Refer to 1-3., 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af

fect performance of the air conditioner.

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

10) Leak test

WARNING

When installing the unit, securely

connect the refrigerant pipes before

starting the compressor.

MXZ-4B_5BVA-A1 JG79A313H01.indd 6 2009/10/13 10:17:27

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Mitsubishi Electric MXZ-5B100VA Installation Manual Page 6

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