Mitsubishi Electric PAC-AK52BC Manuel D'installation page 6

7. Installing refrigerant piping
10~20
30~50
Fig. 7-5
Caution:
Tighten the flare nut with a torque wrench in the specified method.
Overtightening will cause the flare nut to crack and it will cause refrigerant
leakage over a period of time.
Apply refrigeration oil to the entire (Fig. 7-3) surface of the flared seat.
Basically use flared nuts fitted to the body (commercially available flared nuts
may crack).
8. Installing drain piping
Type A
11 10
11
Type B
11
10
11
Fig. 8-1
1.5 to 2 m 25 cm
Fig. 8-2
6
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Note:
(mm)
A special flare nut (optional or attached to the indoor unit) is needed to
some indoor units.
Please refer to the installation manual of outdoor unit and indoor unit for
details.
► Use the following procedures for indoor connection part which indoor
(1) In order to prevent refrigerant leaks, make sure that the flare nuts are tightened
(2) In order to prevent condensation, install the pipe covers
Table 3
► Refrigerant charge:
Refer to the installation manual of the outdoor unit.
Use only R410A refrigerant (use of other refrigerants may cause troubles).
(mm)
• To ensure that the drain piping has a down-gradient (greater than 1/100),
• Install thermal insulation to prevent condensation dripping.
• Ensure that the horizontal length (not diagonal length) of drain piping does not
• Do not fit odor traps at drain piping outlets.
• Install drain outlets in locations where odors will not present problems.
• Do not place drain piping directly in drains which may contain sulfurous gases.
• Drain piping may be installed in any direction provided the above requirements
• Keep bends of attached drain hose to a maximum of 45°.
(1) Apply PVC adhesive (procure locally) to the drain connection on the branch
(2) Insert a hard PVC pipe (VP-16, procure locally) into the attached drain hose
(3) Fit a band
(4) Ensure that the drain piping down-gradient is greater than 1/100. (Fig. 8-2)
Note:
The drain hose is available in either Type A or Type B.
The installation methods are different between Type A and Type B.
Section of connection (Fig. 7-4)
Band
Pipe covers
Tighten
Refrigerant piping
Thermal insulation for refrigerant piping
unit is not connected. (Fig. 7-5)
according to the specified torques* in Table 3.
* Refrigerant may also leak if the flare nuts are tightened more than the speci-
fied torques.
with the supplied bands .
Diameters of branch box openings for
connecting indoor units (mm)
ø6.35
ø9.52
ø12.7
do not make traps or humps in piping.
exceed 20 m. If the drain piping extends over a significant distance, install sup-
ports to ensure that the piping does not sag. Do not fit air bleed pipes under
any circumstances (water may exit from air bleed pipes).
are followed.
box and push the attached drain hose
go. (Fig. 8-1)
and glue it together and fix it. (Fig. 8-1)
VP-16 procured locally
Thermal insulation
to the attached drain hose
Supports
Down-gradient greater than 1/100.
Thermal insulation
and fasten them
Tightening torque
(N·m)
13 ± 2
30 ± 2
50 ± 2
onto the connection as far as it will
(Fig.8-1)