Install The Connecting Pipe - Lennox PISO-TECHO Installation Manual

INSTALL THE CONNECTING 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
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.
1) Connect the indoor unit at first, then the outdoor unit.
Bend the tubing in proper way. Don t 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 12)
Be sure to use two wrenches simultaneously when you connect or disconnect the pipes.
2) 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, 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 before connection.
3) 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.
Notices For Benable pipe.
The bending angle should not exceed 90 C
Bending position is preferably in the bendable pipe. The larger the better it is .
Do not bend the pipe more than three times.
Bend the connecting pipe of small wall thickness.
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 of deforming, please bend the pipe at its biggest radius.
Use bender to get a small radius pipes.
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