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1-13. Example of Tubing Size Selection and Refrigerant Charge Amount
● Charging procedure
Be sure to charge with R410A refrigerant in liquid form.
1. After performing a vacuum, charge with refrigerant from the liquid tubing side. At this time, all valves must be in the "fully closed"
position.
2. If it was not possible to charge the designated amount, operate the system in Cooling mode while charging with refrigerant from
the gas tubing side. (This is performed at the time of the test run. For this, all valves must be in the "fully open" position.)
Charge with R410A refrigerant in liquid form.
With R410A refrigerant, charge while adjusting the amount being fed a little at a time in order to prevent liquid refrigerant from
backing up.
● After charging is completed, turn all valves to the "fully open" position.
● Replace the tubing covers as they were before.
1. R410A additional charging absolutely must be done through liquid charging.
2. The R410A refrigerant cylinder has a gray base color, and the top part is pink.
3. The R410A refrigerant cylinder includes a siphon tube. Check that the siphon tube is present. (This is
CAUTION
indicated on the label at the top of the cylinder.)
4. Due to differences in the refrigerant, pressure, and refrigerant oil involved in installation, it is not possible
in some cases to use the same tools for R22 and for R410A.
Liquid tube
* Use a hexagonal wrench and turn to the left to open.
4 HP
Hexagonal wrench
5 HP
width
6 HP
Open : Open the valve and rotate it counterclockwise with the hexagonal wrench until it stops.
Close : Open the valve and rotate it clockwise with the hexagonal wrench until it stops.
Gas tube
Liquid tube
Size
Torque
5 – 7 N·m
4 mm
{50 – 70 kgf·cm}
5 – 7 N·m
4 mm
{50 – 70 kgf·cm}
5 – 7 N·m
4 mm
{50 – 70 kgf·cm}
Gas tube
Size
Torque
8 – 10 N·m
4 mm
{80 – 100 kgf·cm}
8 – 10 N·m
4 mm
{80 – 100 kgf·cm}
8 – 10 N·m
4 mm
{80 – 100 kgf·cm}
16
Direction of the opening
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