Panasonic CU-4KS31NBU service manual Insulation of Refrigerant Tubing,  For wall-mounted units

CAUTION

Be sure to match refrigerant tubing and electric wiring between indoor and outdoor units.

Torque wrench

Indoor unit	Spanner
	Outdoor unit

3-6. Insulation of Refrigerant Tubing

IMPORTANT

To prevent heat loss and wet floors due to dripping of con-

densation, both tubes must be well insulated with a proper insulation material.

The thickness of the insulation should be a minimum 5/16" (8 mm). (Fig. 16)

For wall-mounted units

After connecting the refrigerant tubing to the outdoor unit and performing a leak test on the connecting part, insulate it with the tubing insulation. (Fig 17a)

For ceiling-mounted cassette units

Wind the insulation tape around the flare nuts at the tube connections. Secondly cover up the tubing connections with the flare insulation (1/8" (T3, supplied)). Then wind the other flare insulation (3/16" (T5, supplied)). Finally, fasten the insulation at both ends with the supplied vinyl ties. (Fig. 17b)

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.

	Fig. 15
	Insulation
	Thickness:
Min.	min. 5/16"
5/16"	(8 mm)
(8 mm)

Fig. 16

Insulation

Fig. 17a

Insulation tape (supplied)	Flare insulation (3/16"(T5, supplied) )
	Flare insulation (1/8"(T3, supplied) )
	Tube insulation
	(not supplied)
Flare nut
Vinyl tie (supplied)

Fig. 17b

Drain hose insulation and vinyl tie (supplied)

Drain hose and hose band (supplied)

Drain pipe and insulation	Refrigerant tubing
(not supplied)	and insulation
	(not supplied)

Insulation tape (supplied)

Vinyl tie (supplied)

Flare

insulation (supplied)

The procedure used for installing the insulation for both wide and narrow tubes are the same.

Fig. 17c

Never grasp the drain or refrigerant connecting out- lets when moving the unit.

18