Connecting Tubing Between Indoor And Outdoor Units - Panasonic S-15MF3E5AN Installation Instructions Manual

5-2. Connecting Tubing Between Indoor and Outdoor Units

NOT E
When connecting to the mini VRF 8HP, 10HP (outdoor units type LE1 only), select the main tube
by using the following values. For details, refer to the installation instructions of the outdoor unit.
Indoor unit
Type F3
(1) Tightly connect the indoor-side refrigerant tubing extended from the wall with the outdoor-side
tubing.
Indoor Unit Tubing Connection
Indoor unit type
Gas tube
Liquid tube
(2) To fasten the flare nuts, apply specified torque.
● When removing the flare nuts from the tubing connections, or when tightening them after
connecting the tubing, be sure to use two spanners.
When tightening the flare nuts, use a torque wrench.
If the flare nuts are over-tightened, the flare may be damaged, which could result in refrigerant
leakage and cause injury or asphyxiation to room occupants.
● For the flare nuts at tubing connections, be sure to use the flare nuts that were supplied with
the unit, or else flare nuts for R410A (type 2). The refrigerant tubing that is used must be of
the correct wall thickness as shown in the following table.
Because the pressure is approximately 1.6 times higher than conventional refrigerant R22
pressure, the use of ordinary flare nuts (type 1) or thin-walled tubes may result in tube
rupture, injury, or asphyxiation caused by refrigerant leakage.
● In order to prevent damage to the flare caused by over-tightening of the flare nuts, use the
following table as a guide when tightening.
Tightening torque
Tube diameter
ø6.35 (1/4")
{140 – 180 kgf · cm}
ø9.52 (3/8")
{340 – 420 kgf · cm}
ø12.7 (1/2")
{490 – 610 kgf · cm}
ø15.88 (5/8")
{680 – 820 kgf · cm}
100 – 120 N · m
ø19.05 (6/8")
{1,000 – 1,200 kgf · cm}
● When tightening the flare nut on the liquid tube, use an adjustable wrench with a nominal
handle length of 200 mm.
15 22 28 36 45
0.103
15 22 28 36 45
ø12.7
ø6.35
Tube thickness
(approximate)
14 – 18 N · m
34 – 42 N · m
49 – 61 N · m
68 – 82 N · m
56 60 73 90 106 112 140 160
0.137
56 60 73 90 106 112 140 160
ø15.88
ø9.52
0.8 mm
0.8 mm
0.8 mm
1.0 mm
1.0 mm
36
0.205
Unit : mm