(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.
Never charge a large amount
CAUTION
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
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
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
83
