Mitsubishi Electric M Serie Manuel D'installation page 22

Apply proper torque to flare nuts.
11.1. Insulation
To avoid dew drops, provide sufficient anti-sweating insulation to the refrigerant and drain pipes. When
using commercially available refrigerant pipes, be sure to cover with available insulating material with
heat-resistant temperature of more than 100 °C [212 °F] and thickness given below, on both liquid and gas
pipes. Insulate all indoor pipes with polyethylene insulation with a minimum density of 0.03 and a thickness
as specified in the table below.
Pipe size
6.4 mm to 25.4 mm [1/4 to 1 in.]
28.6 mm to 38.1 mm [1-1/8 to 1-1/2 in.]
• If the unit is used on the highest story of a building and under high temperature and high humidity, it is necessary to use thicker
insulation than specified in the table above.
• If there are customer's specifications, please follow them.
11.2. Piping size
Model code
Liquid pipe
Refrigerant pipe
Gas pipe
Drain Pipe
Specifications are subject to change without notice.
SVZ-KP12, 18, 24, 30, 36NA
• Never use existing refrig-
erant piping.
• The large amount of
chlorine in conventional
refrigerant and refriger-
ant oil in the existing
piping will cause the
new refrigerator to dete-
riorate.
• Store the piping to be
used during the installa-
tion indoors and keep
both ends of the piping
sealed until just before
brazing.
Insulation thickness
>10 mm [7/16 in.]
>15 mm [5/8 in.]
12 18
6.35 mm [1/4]
9.52 mm [3/8] 12.7 mm [1/2]
O.D. 32 mm [1-1/4]
22
• If dust, dirt or water gets in-
to the refrigerant cycle, the
oil will deteriorate and the
compressor may fail.
• Use ester oil, ether oil or al-
kylbenzene (small amount)
as the refrigerant oil to coat
flares and flange connec-
tions before connecting.
• The refrigerant used in the
unit is highly hydroscopic
and mixes with water which
will degrade the refrigerant
oil.
24, 30, 36
9.52 mm [3/8]
15.88 mm [5/8]
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