Mitsubishi Electric MXZ-8C48NA Installation Manual download pdf (Page 6)

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.

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)

*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.

4-2. GAS CHARGE

Perform gas charge to unit.

1)Connectgascylindertotheserviceportofstopvalve.

2) Perform air purge of the pipe (or hose) coming from refrigerant gas

cylinder.

3)Replenishspecied amountof therefrigerant,while operatingthe air

conditioner for cooling.

Note:

Incaseofaddingrefrigerant,complywiththequantityspeciedforthe

refrigeratingcycle.

CAUTION:

Whenchargingtherefrigerantsystemwithadditionalrefrigerant,besure

touseliquidrefrigerant.Addinggasrefrigerantmaychangethecomposi

tionoftherefrigerantinthesystemandaffectnormaloperationoftheair

conditioner.Also,chargethesystemslowly,otherwisethecompressor

will be locked.

Tomaintainthehighpressureofthegascylinder,warmthegascylinder

with warm water (under 40°C) during cold season. But never use naked

reorsteam.

Union

Stop valve

Liquid pipe

Union

Indoor

unit

Stop valve with

service port

Gas pipe

Refrigerant gas

cylinder

operating valve

(for R410A)

Gauge manifold

valve (for R410A)

Charge hose (for R410A)

Refrigerantgascylinder

for R410A with siphon

Electronic scale for

refrigerant charging

Refrigerant (liquid)

Outdoor

unit

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

manifold 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

Service port cap

(Torque 13.7 to

17.7 N•m, 140 to

180kgf

•cm)

Charge hose

(for R410A)

*Dunitisfor4B71VAonly.

WARNING

When installing the unit, securely

connect the refrigerant pipes before

starting the compressor.

MXZ-3B_4BVA-A1 JG79A319H01.indd 6 2009/10/13 10:27:03

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Mitsubishi Electric MXZ-8C48NA Installation Manual Page 6

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