Mitsubishi Electric CITY MULTI PUMY-P140VKM1 Installationshandbuch Seite 10

4. Installing the refrigerant piping
A Stop valve <Liquid side>
B Stop valve <Gas side>
C Service port
D Open/Close section
E Local pipe
Fig. 4-8
(1) 1
Fig. 4-9
(2) 1
Fig. 4-10
Fig. 4-11
10
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.
2
2
* 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
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
pressure does not decrease.
2 Pressurize to 1.5 MPa (15 kgf/cm
pressure does not decrease.
3 Pressurize to 4.15 MPa (41.5 kgf/cm
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 2 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
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.)
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.
2 G), wait five minutes, and make sure the
2 G), wait five minutes, and make sure the
2 G) and measure the surrounding tem-
F Open position side
G Service port
H Wrench hole
I Refrigerant flow direction