Panasonic S-36PU1E5A Technical Data & Service Manual page 271

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 table below.
Tube diameter
ø6.35 (1/4")
ø9.52 (3/8")
ø12.7 (1/2")
ø15.88 (5/8")
Because the pressure is approximately 1.6 times higher than conventional refrigerant 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 overtightening of the flare nuts, use the table above as a
guide when tightening.
When tightening the flare nut on the liquid tube, use a adjustable wrench with a nominal handle length of
200 mm.
When tightening the flare nut with the adjustable wrench, do not apply to the valve stem cap with the other
one. If doing so, the valve will be damaged.
Valve stem cap
Depending on the installation conditions, applying excessive torque may cause the nuts to crack.
Precautions for Packed Valve Operation
If the packed valve is left for a long time with the valve stem
cap removed, refrigerant will leak from the valve.
Therefore, do not leave the valve stem cap removed.
Use a torque wrench to securely tighten the valve stem cap.
Tightening torque:
Charging port
ø6.35 (Liquid side)
ø9.52 (Liquid side)
ø12.7, ø15.88 (Gas side)
Tightening torque
Tube thickness
(approx.)
14 – 18 N · m
{140 – 180 kgf · cm}
34 – 42 N · m
{340 – 420 kgf · cm}
49 – 55 N · m
{490 – 550 kgf · cm}
68 – 82 N · m
{680 – 820 kgf · cm}
Flare nut
Tightening torque (approx.)
10.7 – 14.7 N • m {107 – 147 kgf • cm}
14.0 – 20.0 N • m {140 – 200 kgf • cm}
20.6 – 28.4 N • m {206 – 284 kgf • cm}
48.0 – 59.8 N • m {480 – 598 kgf • cm}
1-261
0.8 mm
0.8 mm
0.8 mm
1.0 mm
Packed valve
Valve stem
Valve stem cap
1
Charging port
Main valve