Sanyo CMH1972A Technical & Service Manual page 105

Be sure to match refrigerant
CAUTION
tubing and electric wiring
between indoor and outdoor
units.
3-6. Insulation of Refrigerant Tubing
IMPORTANT
To prevent heat loss and wet floors due to dripping of con-
densation, both tubes must be well insulated with a
proper insulation material.
The thickness of the insulation should be a minimum 5/16"
(8 mm). (Fig. 16)
I For wall-mounted units
After connecting the refrigerant tubing to the outdoor unit
and performing a leak test on the connecting part, insulate it
with the tubing insulation. (Fig 17a)
I For ceiling-mounted cassette units
Wind the insulation tape around the flare nuts at the tube
connections. Secondly cover up the tubing connections
with the flare insulation (1/8" (T3, supplied)). Then wind the
other flare insulation (3/16" (T5, supplied)). Finally, fasten
the insulation at both ends with the supplied vinyl ties.
(Fig. 17b)
Insulation material
The material used for insulation must have good insulation
characteristics, be easy to use, be age resistant, and must
not easily absorb moisture.
Torque wrench
Indoor unit
Min.
5/16"
(8 mm)
Insulation tape (supplied)
Flare nut
Vinyl tie (supplied)
Drain hose insulation
and vinyl tie
(supplied)
Drain hose
and hose band
(supplied)
Never grasp the drain or refrigerant connecting out-
lets when moving the unit.
17
Spanner
Outdoor unit
Fig. 15
Insulation
Thickness:
min. 5/16"
(8 mm)
Fig. 16
Insulation
Fig. 17a
Flare insulation (3/16"(T5, supplied) )
Flare insulation (1/8"(T3, supplied) )
Tube insulation
(not supplied)
Fig. 17b
Drain pipe and insulation Refrigerant tubing
(not supplied) and insulation
(not supplied)
Insulation tape
Vinyl tie (supplied)
Flare
insulation
The procedure used for installing
the insulation for both wide and
narrow tubes are the same.
Fig. 17c