Mitsubishi Electronics SPLIT-TYPE MSZ-D30/36NA User Manual download pdf (Page 7)

3-2. FLARE CONNECTION

1) Cut the copper pipe as straight as possible with a pipe cutter. (Fig. 1, 2)

2) Remove all burrs from the cut section of the pipe, ensuring that precautions are taken to

avoid getting metal shavings into the piping. (Fig. 3)

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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

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3-3. PIPE CONNECTION

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Indoor unit connection

Connect both liquid and gas piping to indoor unit.

• Apply a thin coat of refrigerant oil (J) on the seat surface of pipe.

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• Use tightening torque table above as a guideline for indoor unit side joints, and tighten

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Outdoor unit connection

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

detailed in Indoor unit connection.

• For tightening, use a torque wrench or spanner.

3-4. INSULATION AND TAPING

1) Cover piping joints with pipe cover.

2) For outdoor unit side, insulate the piping, including valves.

3) Apply piping tape (G) starting from the connection on the outdoor unit.

• When piping has to be installed through a ceiling, closet or where the temperature

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tion.

Copper

pipe

Good

Tilted

No good

Fig. 1 Fig. 2

Burr

Copper pipe

Spare reamer

Pipe cutter

Fig. 4

Fig. 3

Smooth all around

Even length

all around

Inside is shin-

ing without any

scratches.

Fig. 5

Fig. 6

Flare nut

Die

Copper pipe

Clutch type

Flaring tool

Wing nut type

Pipe diameter

inch (mm)

Nut

inch

(mm)

A inch (mm) Tightening torque

Clutch

type tool

for R410A

Clutch

type tool

for R22

Wing nut

type tool

for R22

N•m

ft•lb

(kgf•cm)

ø 1/4 (6.35)

1/4

(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)

13.7 to

17.7

10 to 13

(140 to

180)

ø 3/8 (9.52)

3/8

(22)

34.3 to

41.2

25 to 30

(350 to

420)

ø 1/2 (12.7)

1/2

(26)

0.08 to

0.10

(2.0 to

2.5)

49.0 to

56.4

36 to 42

(500 to

575)

ø 5/8 (15.88)

5/8

(29)

73.5 to

78.4

54 to 58

(750 to

800)

4-1. PURGING PROCEDURES AND LEAK TEST

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

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 15 minutes or more.

4) Check the vacuum with the gauge manifold valve, then close it and shut off the vacuum

pump.

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

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LQ+J>±PP+J@

6) Quickly remove gauge manifold valve 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 the unit without fully opening the valves

lowers the performance and causes problems.

8) Refer to 1-3. SPECIFICATIONS, 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.

10) Conduct a leak test

Stop valve for

GAS

Stop valve cap

(Torque 19.6 to

29.4 N•m, 200

WRNJIƒFP

Vacuum pump (or the vacuum

pump with the function to

SUHYHQWWKHEDFNÀRZ

Gauge manifold valve

(for R410A)

Compound pressure gauge

(for R410A)

±03D

±LQ+J

>±PP+J@

Handle

Low

Handle High

Adapter for pre-

venting the back

ÀRZ

Charge hose

(for R410A)

*Close

*Open

Hexagonal wrench

Precautions when using the control valve

When attaching the control valve

to the service port, valve core may

deform or loosen if excess pressure

is applied. This may cause gas leak.

Service port

Charge hose

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)

*4 to 5 turns

Stop valve

for LIQUID

4. PURGING PROCEDURES, LEAK TEST, AND TEST RUN

Pressure gauge

(for R410A)

Uneven Burred

1 2 3 4 5 6 7 8

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Mitsubishi Electronics SPLIT-TYPE MSZ-D30/36NA User Manual Page 7

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