Midea MCA-24CRN2, Installation Manual

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INSTALL THE CONNECTING PIPE
10
Daub the surfaces of the flare pipe and the joint nuts with frozen oil, and wrench it for 3~4 rounds
with hands before fasten the flare nuts.(Refer to chart 19)
Be sure to use two wrenches simultaneously when you connect or disconnect the pipes.
CAUTIONS
CAUTIONS
CAUTION
Check whether the height drop between the indoor unit and outdoor unit, the length of refrige-
rant pipe, and the number of the bends meet the following requirements:
The max height drop......................................................................................................................20m
(If the height drop is more than 10m, you had better put the outdoor unit over above the indoor unit.)
The length of refrigerant pipe..........................................................................................less than 30m
The number of bends.........................................................................................................less than 15
Do not let air, dust, or other impurities fall in the pipe system during the time of installation.
The connecting pipe should not be installed until the indoor and outdoor units have been fixed already.
Keep the connecting pipe dry, and do not let moisture in during installation.
The Procedure of Connecting Pipes
1. Measure the necessary length of the connecting pipe, and make it by the following way.
(Refer to "Connect The Pipes" for details)
1) Connect the indoor unit at first, then the outdoor unit.
Bend the tubing in proper way. Do not harm to them.
Chart 19 Chart 20 Chart 21
Use frozen oil
Bend the pipe with thumb
min-radius 100mm
Make the end straight
Cut out a desired concave at the bending part of the insulating pipe.
Then expose the pipe (cover it with tapes after bending).
To prevent collapsing or deforming, please bend the pipe at its biggest radius.
Use bender to get a small radius pipes.
2) The stop value of the outdoor unit should be closed absolutely (as original state). Every time you
connect it, first loosen the nuts at the part of stop value , then connect the flare pipe immediately (in
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 later. So please expel the air out of the pipe with refrigerant
(R407C) before connection.
3) Expel the air (refer to the "Expel The Air") after connecting the refrigerant pipe with the indoor unit.
Then fasten the nuts at the repair-points.
Notices For Bendable Pipe
0
The bending angle should not exceed 90 .
Bending position is preferably in the middle of the bendable pipe. The larger the bending radius the
better it is.
Do not bend the pipe more than three times.
Bend the connecting pipe of small wall thickness
( 9.53mm)