Panasonic S-12MU1U6 Installation Instructions Manual page 55

3. Cutting and Flaring of Liquid Tube
After determining the position for installation, cut the liquid tube and fl are the connecting portion.
(Pay attention to the notes below when fl aring the tubes.)
NOTE
●
After cutting the tube, deburr and fi nish the end face smoothly and correctly.
●
Do not damage tubes while fl aring.
●
Take care not to allow dirt and deburred chips into the tube.
●
Use the fl are nut which came with External Electronic Expansion Valve Kit.
●
The fl aring dimensions for R410A are different from the conventional dimensions for R407C and R22. For R410A,
the specially created fl aring tool is recommended. However a conventional tool can be used by adjusting the amount
of copper tube projection as shown in the table below.
R410A
If special R410A If conventional
tool is used tool is used
B = 0 - 1/64
4. Connection of External Electronic Expansion Valve with Tubing
In connection with tubing, take care to fi t the external electronic expansion valve in the right direction.
Be sure to install with the
on the label to check the directions of the indoor unit side and outdoor unit side.
(The wiring outlet side faces the indoor unit.) (Refer to Fig. 3-172.)
●
Tightening fl are nuts
CAUTION
Be sure to use 2 spanners together when removing or tightening
the fl are nuts. After connection with the tubing, tighten the fl are
nuts by the correct torque. Failure to tighten the nuts correctly
can cause loosening and damage on the fl ared portion, resulting
in accidents by oxygen defi ciency due to refrigerant leaks.
VRF_Indoor_US.indb 55 VRF_Indoor_US.indb 55
Rigid (clutch type)
R407C, R22
If conventional
tool is used
3/64 - 1/16 0 - 1/64
mark on the label pointing upwards. Also when connecting the fl are, use the arrow marks
Unit : in.
Copper tube projection for flaring: B (in.)
Attached label on the unit
EXTERNAL ELECTRONIC EXPANSION VALVE KIT
SOURCE
SERIAL NO.
INDOOR OUTDOOR
SIDE
UP
MUST BE INSTALLED AS ARROWS.
Fig. 3-172
Tubing size
1/4" (Ø6.35)
3/8" (Ø9.52)
55
Fig. 3-171
SIDE
Tightening torque
120 - 160 lbs • inch
(140 - 180 kgf • cm)
300 - 360 lbs • inch
(340 - 420 kgf • cm)
2011/09/30 12:23:11 2011/09/30 12:23:11