Panasonic R410A Specifications, Precautions for Packed Valve Operation, Fig, Taping the flare nuts

Do not use a spanner to tighten the valve stem caps. Doing so may damage the valves.

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.

Valve stem cap tightening torque:

Charging port	70 – 85 in.lbs (80 – 100 kgf • cm)
ø3/8" (Liquid side)	160 – 180 in.lbs (190 – 210 kgf • cm)
ø5/8" (Gas side)	240 – 270 in.lbs (280 – 320 kgf • cm)

3.Insulating the Refrigerant Tubing Tubing Insulation

1 Thermal insulation must be applied to all unit tubing, including the distribution joint (purchased separately).

*For gas tubing, the insulation material must be heat resistant to 248°F or above. For other tubing, it must be heat resistant to 176°F or above.

Insulation material thickness must be 13/32 in. or greater.

1. Specifications

Packed valve

Charging port

Valve stem

	Main valve
Valve stem cap
	Fig. 1-117
2 tubes arranged together
Inter-unit	Gas tube
control wiring	Liquid tube

Armoring tape

Insulation

Fig. 1-118

Sealer (supplied)

Insulation tape (white)

CAUTION

Taping the flare nuts

If the exterior of the outdoor unit valves has been finished with a square duct covering, make sure you allow sufficient space to access the valves and to allow the panels to be attached and removed.

(supplied)

	Flare insulator (supplied)
Unit side	Tube insulator
	(not supplied)
insulator	Heat resistant
	248°F or above

Flare nut

Vinyl clamps (supplied)

Fig. 1-119

Never grasp the drain or refrigerant connecting

Wind the white insulation tape around the fl are nuts at the gas tube connections. Then cover up the tubing connections with the fl are insulator, and fi ll the gap at the union with the supplied black insulation tape. Finally, fasten the insulator at both ends with the supplied vinyl clamps. (Fig. 1-119)

Insulation material

The material used for insulation must have good insulation characteristics, be easy to use, be age resistant, and must not easily absorb moisture.

After a tube has been insulated, CAUTION never try to bend it into a narrow

curve because it can cause the tube to break or crack.

outlets when moving the unit.

1-120