Daikin VRV II Series Design, Installation & Testing Instructions page 42

Installation
3.2.7 Additional Charge of Refrigerant at installation time
!
Important points
1. The results of all calculations must be recorded. (Make a list.)
2. The refrigerant will need to be additionally charged whenever the distance between the outdoor unit and
3. The additional charging operation should be carried out by input of liquid from Service port at liquid stop
4. When the additional charging operation cannot be satisfactorily completed use the action of the
Refrigerant
HFC401A are Quasi-azeotropic* refrigerants. Therefore, these refrigerants must be charged in the liquid
state. When charging the refrigerant into equipment from the refrigerant cylinder, turn the refrigerant
Charging
cylinder upside down.
Instructions
Important: Make sure that the refrigerant (liquid) is taken out from the bottom part of the refrigerant cylinder.
Do not take out the refrigerant (gas) at the upper part of the refrigerant cylinder for charging.
Caution
Since some refrigerant cylinders differ in the internal mechanism, it is necessary to examine the cylinder
carefully. (Some cylinders have a siphon tube to eliminate the need for turning it upside down.)
Siphon tube
36
Operational steps
Use the length of the piping to
calculate the amount of
refrigerant required
the most distant indoor unit is more than 10m.
valve following completion of the vacuum drying operation.
compressor to complete the additional charging during the test run.
Additional charge of
refrigerant
(V0995)
Si39-303
General Information