Sanyo CM1972 Service Manual - Page 21

Indoor unit, Outdoor unit

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Outdoor Unit CM3172 Indoor unit Wide tube O.D.3/8" O.D.3/8" O.D.1/2" O.D.1/2" Service valve on wide tube DW CW BW AW Header Outdoor unit Sub Main accumulator accumulator High pressure switch H.P. Narrow tube O.D.1/4" O.D.1/4" O.D.1/4" O.D.1/4" Service valve on narrow tube DN Electric expansion valve M CN M BN M AN M Strainer Header Heat exchanger Compressor Cooling cycle Insulation of Refrigerant Tubing IMPORTANT Because capillary tubing is used in the outdoor unit, both the wide and narrow tubes of this air conditioner become cold. To prevent heat loss and wet floors due to dripping of condensation, both tubes must be well insulated with a proper insulation material. The thickness of the insulation Thickness: Min.5/16"(8 mm) should be a min.5/16"(8 mm). CAUTION After a tube has been insulated, never try to bend it into a narrow curve because it can cause the tube to break or crack. Wide tube Insulation Thickness: Min.5/16"(8 mm) Narrow tube 21

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Service valve on
narrow tube
Electric
expansion
valve
Service valve on
wide tube
DN
CN
BN
AN
DW
CW
BW
AW
O.D.1/4"
O.D.1/4"
O.D.1/4"
O.D.1/4"
O.D.3/8"
O.D.3/8"
O.D.1/2"
O.D.1/2"
Cooling cycle
Strainer
Header
Header
M
M
M
M
Indoor unit
Outdoor unit
Wide tube
Narrow tube
Outdoor Unit
CM3172
Insulation of Refrigerant Tubing
Because capillary tubing is used in the outdoor unit, both the
wide and narrow tubes of this air conditioner become cold. To
prevent heat loss and wet floors due to dripping of
condensation,
both tubes must be well insulated
with a
proper insulation material. The thickness of the insulation
should be a min.5/16"(8 mm).
After a tube has been insulated,
never try to bend it into a narrow
curve because it can cause the tube
to break or crack.
Wide tube
Thickness:
Min.5/16"(8 mm)
Insulation
Narrow tube
Thickness:
Min.5/16"(8 mm)
IMPORTANT
CAUTION
Compressor
High pressure
switch
H.P.
Main
accumulator
Sub
accumulator
Heat exchanger
21