Panasonic CU-KE18NKU, CU-KE12NK1, CS-KE18NB4UW, CS-KE12NB41, CZ-18BT1U service manual

Models: CZ-18BT1U CS-KE12NB41 CS-KE18NB4UW CU-KE18NKU CU-KE12NK1

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Manual background

(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.

Configuration and characteristics of cylinders

Valve

CAUTION

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

Liquid

Single valve

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 Manual background 0.20 = 6.08 lb. (0.76 + 10 Manual background 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%.

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

Manual backgroundManual background NO!

Charging

cylinder

 

Liquid

Open

Refrigerant

 

cylinder

Fig. 3

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Panasonic CU-KE18NKU, CU-KE12NK1, CS-KE18NB4UW, CS-KE12NB41, CZ-18BT1U service manual