Midea MFA-12HRN1 General Information Manual page 48

Installation of the Connecting Pipe
Insert a flare nut into a pipe and flare the pipe.
Refer to the following table for the dimension of flare nut spaces.
Pipe gauge
Φ6.4
Φ9.5
Φ12.7
Φ15.9
Φ19.1
2. Connect the indoor unit at first, then the outdoor unit.
Bend the tubing in proper way. Do not harm to them.
The bending angle should not exceed 90°.
Bending position is preferably in the middle of the bendable pipe. The larger the bending radius the
better it is.
Do not bend the pipe more than three times.
When connecting the flare nut, coat the flare both inside and outside with either oil or ester oil and
initially tighten by hand 3 or 4 turns before tighting firmly.
Be sure to use both spanner and torque wrench together when connecting or disconnecting pipes to the unit.
Caution:
Too large torque will harm the bell mouthing and too small will cause leakage.
After the connecting work is finished, be sure to check that there is no gas leak.
46
Tightening torque
15 ～ 16N.m
(153 ～ 163kgf.cm)
25 ～ 26N.m
(255 ～ 265 kgf.cm)
35 ～ 36 N.m
(357 ～ 367 kgf.cm)
45 ～ 47 N.m
(459 ～ 480 kgf.cm)
65 ～ 67 N.m
(663 ～ 684 kgf.cm)
Flare dimension (A)
Min Max
8.3 8.7
12.0 12.4
15.4 15.8
18.6 19.0
22.9 23.3
MCAC-UTSM-2009-03
Flare shape
Installation