Panasonic CU-4KS31NBU service manual General

1. General

This booklet briefly outlines where and how to install the air conditioning system. Please read over the entire set of instruc- tions for the indoor and outdoor units and make sure all accessory parts listed are with the system before beginning.

If the electric wiring diagram does not appear in this manual, please check for the diagram on the indoor unit.

1-1. Tools Required for Installation (not supplied)

1.	Standard screwdriver	7.	Hacksaw	13.	Torque wrench
2.	Phillips head screwdriver	8.	Core bits	14.	Adjustable wrench
3.	Knife or wire stripper	9.	Hammer	15.	Reamer (for deburring)
4.	Tape measure	10.	Drill	16.	Vacuum pump (For R410A)
5.	Carpenter’s level	11.	Tube cutter	17.	Manifold valve
6.	Sabre saw or key hole saw	12.	Tube flaring tool

1-2. Accessories Supplied with Unit Table 1

	Parts	Figure	Q’ty	Parts	Figure	Q’ty	Parts	Figure	Q’ty
Labels for inter-unit		A B C D	4 each	Cushion rubber		4	Reducer	CU-4KS24NBU	1
cable and tube							(1/2" 3/8")	CU-4KS31NBU	2
Reducer		CU-3KS19NBU	1					Packed in the outdoor unit.
(3/8"	1/2")

1-3. Optional Copper Tubing Kit

Copper tubing for connecting the outdoor unit to the indoor unit is available in kits which contain the narrow and wide tubing, fittings and insulation. Consult your nearest sales outlet or air conditioning workshop.

1-4. Type of Copper Tube and Insulation Material

If you wish to purchase these materials separately from a local source, you will need:

1.Deoxidized annealed copper tube for refrigerant tub- ing as detailed in Table 2.

Cut each tube to the appropriate lengths 1' to 1'4" (30 cm to 40 cm) to dampen vibration between units.

Table 2

2.Foamed polyethylene insulation for the specified copper tubes as required to precise length of tubing. Wall thickness of the insulation should be not less than 5/16" (8 mm).

3.Use insulated copper wire for field wiring. Wire size varies with the total length of wiring.

Refer to 5. Wiring Instructions for details.

CAUTION	Check local electrical codes
	and regulations before
	obtaining wire. Also, check
	any specified instructions or
	limitations.

Model	Narrow Tube		Wide Tube
	Outer Dia.	Thickness	Outer Dia.	Thickness
CS-MKS7NKU, CS-MKS9NKU, CS-MKS12NKU	1/4" (6.35 mm)	0.0314" (0.8 mm)	3/8" (9.52 mm)	0.0314" (0.8 mm)
CS-MKS18NKU	1/4" (6.35 mm)	0.0314" (0.8 mm)	1/2" (12.70 mm)	0.0314" (0.8 mm)
CS-MKS24NKU	1/4" (6.35 mm)	0.0314" (0.8 mm)	5/8" (15.88 mm)	0.0393" (1.0 mm)
CS-MKS9NB4U, CS-MKS12NB4U	1/4" (6.35 mm)	0.0314" (0.8 mm)	3/8" (9.52 mm)	0.0314" (0.8 mm)
CS-KS18NB4UW	1/4" (6.35 mm)	0.0314" (0.8 mm)	1/2" (12.70 mm)	0.0314" (0.8 mm)

1-5. Additional Materials Required for Installation
1.	Refrigeration (armored) tape	3.	Putty
2.	Insulated staples or clamps for connecting wire	4.	Refrigeration lubricant
	(See local codes.)	5.	Clamps or saddles to secure refrigerant tubing

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