Lennox LM012CI-100V433 Service Manual page 21

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Shape the connection pipe
2.5.4 Connecting the pipes.
 Do not remove the cap from the pipe until
connecting it, to avoid dampness or dirt
from entering.
 If the pipe is bent or pulled too often, it will
become stiff. Do not bend the pipe more
than three times at one point.
 When extending the rolled pipe, straighten
the pipe by unwinding it gently as shown in
the picture.
YES
Extending the rolled pipe
2.5.5 Connections to the indoor unit
1).Remove the indoor unit pipe cap (check that
there is no debris inside).
2).Insert the fare nut and create a flange at the
extreme end of the connection pipe.
3).Tighten the connections by using two wrenches
working in opposite directions.
Capacity
(Btu/h)
Gas
7/9/12K 3/8" (4.2kg.m)
18K 1/2" (5.5kg.m)
24K 5/8" (6.6kg.m)
Air Conditioner Service Manual
NO
Pipe Size (Torque)
Liquid
1/4" (1.8kg.m)
1/4" (1.8kg.m)
3/8" (4.2kg.m)
Wrap the insulation material around the
connecting portion.
 Overlap the connection pipe insulation material
and the indoor unit pipe insulation material.
Bind them together with vinyl tape so that there
is no gap.
Wrap the area which accommodates the rear
piping housing section with vinyl tape.
 Bundle the piping and drain hose together by
wrapping them with vinyl tape over the range
within which they fit into the rear piping
housing section.
2.5.6 Indoor unit condensed water drainage
The indoor unit condensed water drainage is
fundamental for the success of the installation.
1).Place the drain hose below the piping, taking
care not to create siphons.
2).The drain hose must slant downwards to aid
drainage.
3).Do not bend the drain hose or leave it protruding
or twisted and do not put the end of it in water.
If an extension is connected to the drain hose,
ensure that it is lagged when it passes into the
indoor unit.
4).If the piping is installed to the right, the pipes,
power cable and drain hose must be lagged and
secured onto the rear of the unit with a pipe
connection.
When extending the drain hose at the indoor unit,
install the drain pipe.
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