Leak Detection - Midea Air Conditioner Installation Manual

i. When bending the pipe, cut out a notch of the desired size at the
bend of the adiabatic pipe, and then expose the pipe (wrap the pipe
with the wrapping tape after bending it).
ii. The radio of the elbow pipe should be as large as possible to
prevent flattening or crush.
iii. Use the pipe bender to make close elbow pipe.
c. Use purchased copper pipe
When the cooper pipe is purchased from the market, be sure to use
the heat insulation materials of the same type (with a thickness of
over 9mm).
2. Deploy the pipelines
1) Drill a porthole on the wall, and put the hole sheath and hole
cover through the wall.
2) Place the connective pipe together with the indoor & outdoor
connection wires. Use wrapping tape to tie them tight. Do not let
air penetrate into it lest condensation and drips of moist.
3) Pull the connective wrapped connective pipe from outdoor
through the sheath, which gets through the wall, and lead it into
the room.
3. Make a vacuum of connective pipeline.
4. After the above steps are completed, the spool of the valve of
the outdoor unit should be completely open, and the refrigerant
pipeline of the indoor unit and the outdoor unit should be smooth.
5. Use a leak detector or soap water detect leak carefully to
prevent leakage.
6. Put on an adiabatic envelope (accessory) at connective pipe
adapter of the indoor unit, and wrap it tight with the wrapping tape
lest condensate and leakage.
6.4 Pipeline connection
1. Flare
1) Use a pipe cutter to cut off the pipe (See Fig.6-4)
90
2) Pull the pipe into the rear flare of the connective nut. (Refer to
Table: 6-2)
Table: 6-2
Outer
A(mm)
diameter
Max.
(mm)
8.7
Φ6.4
12.4 12.0
Φ9.5
15.8 15.4
Φ12.7
19.0 18.6
Φ15.9
23.3 22.9
Φ19.1
Burr
Coarse
Slant
Fig.6-4
Min.
90 ° ± 4
8.3
A
R0.4~0.8
2. Tighten the nut
Align with the connective pipe, screw up the connection pipe nut
manually, and use a spanner to tighten it as shown in Fig.6-5.
According to the installation conditions, too large torque will
damage the flaring, and too small torque will lead to looseness
and leakage. Determine the tightening torque by reference to
Table: 6-3.
Table: 6-3
Pipe Size
Torgue N.m
14.2～17.2 N.m
Φ6.4
(144～176 kgf.cm)
32.7～39.9 N.m
Φ9.5
(333～407 kgf.cm)
49.5～60.3 N.m
Φ12.7
(504～616 kgf.cm)
61.8～75.4 N.m
Φ15.9
(630～770 kgf.cm)
97.2～118.6 N.m
Φ19.1
(990～1210 kgf.cm)
Please beware when install connective pipe, do not let any air,
dust or other foreign substance invading into system.
Pipes connection could be conducted after the indoor and
outdoor unit are be fixed.
Connective pipe must keep in dry when installation, do not let
water invade in it.
Connective copper pipe must be wrapped insulation layer (at
least 9 mm thickness)
6.5 Air expels
Apply vacuum pump expels air from refrigerant charging vent of
air side in outdoor unit.
It is forbidden to apply the refrigerant inside of indoor unit for
vacuum air.
6.6 Open valve
Employ a 5 mm hexagon spanner to open the valve spool of
indoor and outdoor unit.

6.7 Leak detection

Use soap water to check whether gas leakage exists at the
adapters
Fig.6-5
CAUTION
CAUTION
installation manual
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