Mitsubishi Electric PUMY-P112VKM [10/39] Installing the refrigerant piping

* The ﬁgure to the left is an example

only. The stop valve shape, service port

position, etc., may vary according to the

model.

* Turn section A only.

(Do not further tighten sections A and

B together. )

C Charge hose

D Service port

Precautions when using the charge valve (Fig. 4-11)

Do not tighten the service port too much when installing it, otherwise, the valve core

could be deformed and become loose, causing a gas leak.

After positioning section B in the desired direction, turn section A only and tighten

it.

Do not further tighten sections A and B together after tightening section A.

Fig. 4-11

4. Installing the refrigerant piping

4.6. Refrigerant pipe airtight testing method

(1) Connect the testing tools.

• Make sure the stop valves A B are closed and do not open them.

• Add pressure to the refrigerant lines through the service port C of the liquid

stop valve A and the gas stop valve B.

(2) Do not add pressure to the speciﬁed pressure all at once; add pressure little by lit-

tle.

1 Pressurize to 0.5 MPa (5 kgf/cm

G), wait ﬁve minutes, and make sure the

pressure does not decrease.

2 Pressurize to 1.5 MPa (15 kgf/cm

G), wait ﬁve minutes, and make sure the

pressure does not decrease.

3 Pressurize to 4.15 MPa (41.5 kgf/cm

G) and measure the surrounding tem-

perature and refrigerant pressure.

(3) If the speciﬁed pressure holds for about one day and does not decrease, the pipes

have passed the test and there are no leaks.

• If the surrounding temperature changes by 1°C, the pressure will change by

about 0.01 MPa (0.1 kgf/cm

G). Make the necessary corrections.

(4) If the pressure decreases in steps (2) or (3), there is a gas leak. Look for the source

of the gas leak.

4.7. Stop valve opening method

(1) Gas side (Fig. 4-9)

1 Remove the cap, pull the handle toward you and rotate 1/4 turn in a counterclock-

wise direction to open.

2 Make sure that the stop valve is open completely, push in the handle and rotate

the cap back to its original position.

(2) Liquid side (Fig. 4-10)

1 Remove the cap and turn the valve rod counterclockwise as far as it will go with

the use of a 4 mm hexagonal wrench. Stop turning when it hits the stopper.

(ø6.35: Approximately 4.5 revolutions) (ø9.52: Approximately 10 revolutions)

2 Make sure that the stop valve is open completely, push in the handle and rotate

the cap back to its original position.

A Valve

B Unit side

C Handle

D Cap

E Local pipe side

A Stop valve <Liquid side>

B Stop valve <Gas side>

C Service port

D Open/Close section

E Local pipe

F Open position side

G Service port

H Wrench hole

I Refrigerant ﬂow direction

Refrigerant pipes are protectively wrapped

• The pipes can be protectively wrapped up to a diameter of ø90 before or after con-

necting the pipes. Cut out the knockout in the pipe cover following the groove and

wrap the pipes.

Pipe inlet gap

• Use putty or sealant to seal the pipe inlet around the pipes so that no gaps re-

main.

(If the gaps are not closed, noise may be emitted or water and dust will enter the

unit and breakdown may result.)

Fig. 4-8

(1) 1

Fig. 4-10

Fig. 4-9

(2) 1

F Sealed, same way for gas side

G Pipe cover

H Do not use a wrench here.

Refrigerant leakage may result.

I Use two wrenches here.

Mitsubishi Electric PUMY-P112VKM [10/39] Installing the refrigerant piping

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