Midea MCCU-03CN1A, Installation Manual

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4
installation manual
NOTE
The service valves of the outdoor unit should be completely
closed(as original status).Every time to connect,first to loosen
nuts, then connect the flare pipes within 5 minutes. If the nuts
have been loosened for a long time, dusts and other impurities
may enter the pipe system and may cause malfunction.So
please expel the air out of the pipe with refrigerant before
connection.
Expel the air after connecting the refrigerant pipe with the
indoor unit and the outdoor unit.
Then fasten the nuts at the service valves.
Bend the connecting pipe of small wall thickness.
Cut out a proper concave at the bending part of the
insulating pipe.
Then expose the pipe(cover it with tapes after bending).
To prevent twist of deforming, please bend the pipe at a
proper radius.
Fig 3.3
Make the ends straight
The bending angle should not exceed 90 .
Bending position is preferably in the middle of the bendable pipe.
Do not bend the pipe more than three times.
Be sure to use the same insulating materials when you buy the
brass pipe. (More than 9mm/0.35in thick)
Be sure to use two wrenches simultaneously when you
connect or disconnect the pipes.
2) Place The Pipe
Drill a hole in the wall (suitable just for the size of the wall
sleeve), then set on the fittings such as the wall sleeve and its
cover.
Bind the connecting pipe and the cables together tightly with
binding tapes.
Pass the bound connecting pipe through the wall sleeve from
outside. Make sure of the pipe allocation not to damage the
copper tubes.
3)
5)
6)
7)
4)
Connect the pipes.
Expel the air with a vacuum pump or refrigerant.
Open the service valves of the outdoor unit .
Check the refrigerant leakage. Check all the joints
with the leak detector or soap water.
Cover the joints of the connecting pipe with the
insulation foam, and bind them well with the tapes to
prevent potential leakage.
4 REFRIGERANT PIPE
4.1 Size of joint pipes for outdoor unit
Model
Gas side Liquid side
Φ12.7/0.501in
Φ12.7/0.501in
Φ19/0.748in
Φ6.35/0.25in
Φ9.52/0.375in
Φ9.52/0.375in
the size of main pipe(mm)
03/05
07
10
Size of joint pipes for 410A outdoor unit Table 4-1
Base on the following tables, select the diameters of
the outdoor unit connective pipes. In case of the
main accessory pipe large than the main pipe, take
the large one for the selection.
Fig 4.1
Outdoor unit
Max.pipe length L≤30m(10/14/16)
Drop height between indoor unit and outdoor unit H≤10m/32.9ft (03/05/07) H≤20m/65.8ft(10/14/16)
Indoor unit
Flaring
1)
Cut a pipe with a pipe cutter. (Refer to Fig.5-1)
Insert a flare nut into a pipe and flare the pipe.
Fig 5.1
5.1 Expel The Air
Fasten the nut 2)
Put the connecting pipes at the proper position,
wrench the nuts with hands then fasten it with
two wrenches simultaneously. (Refer to Fig 5.2)
Fig 5.2
5 REFRIGERANT PIPE CONNECTION
90
Lean crude burr
Φ19/0.748in Φ9.52/0.375in 14/16
Max.pipe length L≤20m(03/05/07)