Mitsubishi Electric Mr.Slim PKA-A KA7 Manuel D'installation page 5

3. Installing the indoor unit
C
D
Fig. 3-11
1 )
A
Fig. 3-12
1 )
2 )
Fig. 3-13
A
B
E
2 )
B
C
3 )
Leakage check of the L-shaped connection pipe connection portion
1. Attach the charge nut to the liquid pipe side joint portion.
Tightening force: 34~42 N•m, 25~30ft lbs
2. Pressurize by filling with nitrogen gas from the charge nut.
Do not pressurize to the current constant pressure all at once. Pressurize
gradually.
1) Pressurize to 0.5MPa, 73PSIG wait five minutes, and make sure the pressure
does not decrease.
2) Pressurize to 1.5MPa, 218PSIG wait five minutes, and make sure the
pressure does not decrease.
3) Pressurize to 4.15MPa, 601PSIG and measure the surrounding temperature
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 33.8°F, the pressure will change by
about 0.01MPa, 1.5PSIG. 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.
Extraction and processing of the piping and wiring (Fig. 3-11)
1. Connection of indoor/outdoor wiring
2. Wrap the felt tape in the range of the refrigerant piping and drain hose which
will be housed within the piping space of the indoor unit.
• Wrap the felt tape securely from the base for each of the refrigerant piping
and the drain hose.
• Overlap the felt tape at one-half of the tape width.
• Fasten the end portion of the wrapping with vinyl tape.
Liquid pipe
Gas pipe
Indoor/outdoor connection cable
Drain hose
Felt tape
3. Be careful that the drain hose is not raised, and that contact is not made with the
indoor unit box body.
Do not pull the drain hose forcefully because it might come out.
Rear and lower piping (Fig. 3-12)
1) Be careful that the drain hose is not raised, and that contact is not made with
the indoor unit box body.
Arrange the drain hose at the underside of the piping and wrap it with felt
tape .
2) Securely wrap the felt tape starting from the base. (Overlap the felt tape at
one-half of the tape width.)
Cut off for lower piping.
Left and left rear piping (Fig. 3-13)
4. Drain hose replacement See 5. Drainage piping work
Be sure to replace the drain hose and the drain cap for the left and rear left
piping. Dripping may occur if you forget to install or fail to replace these parts.
Drain cap
1) Be careful that the drain hose is not raised, and that contact is not made with
the indoor unit box body.
2) Securely wrap the felt tape starting from the base. (Overlap the felt tape at
one-half of the tape width.)
3) Fasten the end portion of the felt tape
Cut off for left piping.
See page. 9.
with vinyl tape.
5