Panasonic CS-KS24NKU, CU-KS24NKUA service manual

(5) Recharging

Be sure to charge the specified amount of refrigerant in liquid state using the service port of the wide tube service valve. The proper amount is listed on the unit's nameplate.

When the entire amount cannot be charged all at once, charge gradually while operating the unit in Cooling Operation.

CAUTION	Never charge a large amount
	of liquid refrigerant at once to
	the unit. This may cause
	damage to the compressor.

When charging with a refrigerant cylinder, use an electronic scale for charging refrigerant. In this case, if the volume of refrigerant in the cylinder becomes less than 20% of the fully-charged amount, the composition of the refrigerant starts to change. Thus, do not use the refrigerant if

the amount in the charging cylinder is less than 20%.

Also, charge the minimum necessary amount to the charging cylinder before using it to charge the air conditioning unit.

Example:

In case of charging refrigerant to a unit requiring

1.68lb. (0.76 Kg) using a capacity of a 22 lb. (10 Kg) cylinder, the minimum necessary amount for the cylinder is:

1.68+ 22 0.20 = 6.08 lb. (0.76 + 10 0.20 = 2.76 Kg)

For the remaining refrigerant, refer to the

instructions of the refrigerant manufacturer.

If using a charging cylinder, transfer the specified amount of liquid refrigerant from the refrigerant cylinder to the charging cylinder.

Prepare an evacuated charging cylinder beforehand.

CAUTION	To prevent the composition
	of R410A from changing,
	never bleed the refrigerant
	gas into the atmosphere
	while transferring the
	refrigerant. (Fig. 3)

Do not use the refrigerant if the amount in the charging cylinder is less than 20%.

Configuration and characteristics of cylinders

Valve

Liquid

Single valve

Charge liquid refrigerant with cylinder in up-side-down position.

Fig. 1

Valve

Liquid

Single valve (with siphon tube)

Charge with cylinder in normal position.

Fig. 2

NO!

Charging

cylinder

	Liquid
Open	Refrigerant
	cylinder

Fig. 3

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