Daikin FBQ20EAVAK Installation Manual page 79

01_EN_3P281953-1B.fm Page 18 Tu esday, January 25, 2011 3:35 PM
Perform treatment such as caulking
Wind heat insulation material around
the piping section so it is not exposed
and then cover the insulation material
with vinyl tape.
〈 Precautions when tightening flare nuts 〉
• Be sure to remove the flare nuts using two spanners. Then after the piping connection, tighten them using
a spanner and torque wrench.
• Please refer to the Table 1 for the dimensions for processing flares.
• When connecting the flare nut, coat the flare inner surface with refrigerating machine oil and initially tighten
by hand 3 or 4 turns before tightening firmly.
Flare nut
Connecting piping
connecting section
• Please refer to the Table 1 for the tightening torque. (Too much tightening will end up in splitting of the flare.)
• After all the piping has been connected, use nitrogen to perform a refrigerant leak check.
Table 1
Pipe size
φ 9.5
φ 15.9
English
Compressor
Insulation
(field supply)
Torque
wrench
Tightening torque
32.7 – 39.9 N·m
61.8 – 75.4 N·m
Inter unit piping for the
Indoor and outdoor units
Insulation
(field supply)
Fig. 15
Spanner
Union tube joint
Flare nut
A dimensions for
processing flares (mm)
12.8 – 13.2
19.3 – 19.7
Coat the flare inner
surface only with
ether oil or ester oil.
Flare shape
R0.4-0.8
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