Mitsubishi Electric Mr.SLIM PUZ-ZMDA Serie Manuel D'installation page 12

4. Installing the refrigerant piping
(C)
(D)
(E)
(F)
(G)
(A) Valve <Liquid side>
(B) Valve <Gas side>
(C) Service port
(D) Open/Close section
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(B)
(A)
en
(C)
(I)
(J)
(F)
(E)
Fig. 4-5
(A) Valve body
(B) Unit side
(C) Handle
(D) Cap
(E) Local pipe side
(F) Pipe cover
(G) Service port
(H) Valve stem
(B)
(C)
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(B)
(A)
(H)
(I)
(E) Local pipe
(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.
Fig. 4-4
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(B)
(G)
(A)
(D)
(I)
(F)
(E)
Fig. 4-6
(I) Double spanner section
(Do not apply a spanner other than to this
section. Doing so would cause coolant leaks.)
(J) Seal section
(Seal the end of the heat insulation material
at the pipe connection section with whatever
seal material you have on hand so that water
does not infiltrate the heat insulation material.)
(A)
* The figure to the left is an example only.
The valve shape, service port position, etc.,
may vary according to the model.
* Turn section (A) only.
(D)
(Do not further tighten sections (A) and (B)
together.)
(C) Charge hose
(D) Service port
Fig. 4-7
4.4. Refrigerant pipe airtight testing method (Fig. 4-4)
1. Connect the testing tools.
• Make sure the valves (A) (B) are closed and do not open them.
• Add pressure to the refrigerant lines through the service port (C) of the liquid
valve (A).
2. Do not add pressure to the specified pressure all at once; add pressure little by
little.
(1) Pressurize to 0.5 MPa (5 kgf/cm
sure does not decrease.
(2) Pressurize to 1.5 MPa (15 kgf/cm
sure does not decrease.
(3) Pressurize to 4.15 MPa (41.5 kgf/cm
ture 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
4. If the pressure decreases in steps 2 or 3, there is a gas leak. Look for the source
of the gas leak.
4.5. Valve opening method
The valve opening method varies according to the outdoor unit model. Use the ap-
propriate method to open the valves.
1. Gas side (Fig. 4-5)
(D)
(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 valve is open completely, push in the handle and rotate the
cap back to its original position.
(H)
2. Liquid side (Fig. 4-6)
(J)
(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.
(ø9.52: Approximately 10 revolutions)
(2) Make sure that the valve is open completely, push in the handle and rotate the
cap back to its original position.
Refrigerant pipes are protectively wrapped
• The pipes can be protectively wrapped up to a diameter of ø90 before or after
connecting 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 remain.
(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. 4-7)
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).
Warning:
• W hen installing the unit, securely connect the refrigerant pipes before start-
ing the compressor.
• W hen opening or closing the valve below freezing temperatures, refrigerant
may spurt out from the gap between the valve stem and the valve body,
resulting in injuries.
G), wait five minutes, and make sure the pres-
2
G), wait five minutes, and make sure the pres-
2
G) and measure the surrounding tempera-
2
G). Make the necessary corrections.
2