Install The Panel MCAC-KTSM-2007-2
156 The Installation of MKB
3. Install the drainage pipe
Check whether the height drop between the indoor unit and outdoor unit, the length of refrigerant 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
The standard length of connecting pipe is no more than 8m; choose appropriate position for both indoor and
outdoor unit to make the connecting pipe as short as possible.
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 pipe
1. Locate the Pipe
a) Measure the necessary length of the connecting pipe.
b) Drill a hole in the wall (suitable just for the size of the wall conduit, 90mm in general), then set on the
fittings such as the wall conduit and its cover.
c) Bind the connecting pipe and the cables together tightly with binding tapes. Do not let air in, which will
cause water leakage by condensation.
d) Pass the bound connecting pipe through the wall conduit from outside. Be careful of the pipe allocation to
do no damage to the tubing.
2. Connect the pipes.
a) Connect the indoor unit at first, then the outdoor unit.
Bend the tubing in proper way. Do not harm them.
Cautions:
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 15).Be sure to use two wrenches simultaneously when you
connect or disconnect the pipes.
Use frozen oil
Bend the pipe with thumb
Make t he end straight
min-radius 100 mm
Chart 15
Chart 16
Chart 17
b) The stop valve 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 valve, and 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.
Expel the air (refer to the "Expel the Air") after connecting the refrigerant pipe with the indoor unit and the
outdoor unit. Then fasten the nuts at the repair-points.
