Daikin VRV II Series, Design, Installation & Testing Instructions, Page: 184 / 242

Si39-303
178 Installation Manual
6.6 Additional refrigerant charge
Caution Refrigerant cannot be charged until field wiring has been completed.
Refrigerant may only be charged after performing the leak test and the vacuum drying (see
above).
When charging a system, care shall be taken that its maximum permissible charge is never
exceeded, in view of the danger of liquid hammer.
Charging with an unsuitable substance may cause explosions and accidents, so always ensure
that the appropriate refrigerant (R410A) is charged.
Refrigerant containers shall be opened slowly.
Always use protective gloves and protect your eyes when charging refrigerant.
To avoid compressor breakdown. Do not charge the refrigerant more than the specified amount
to raise the condensing pressure.
!
This outdoor unit is factory charged with refrigerant and depending on pipe sizes and pipe
lengths some systems require additional charging of refrigerant.
!
Charge the refrigerant to the liquid pipe in its liquid state. Since R410A is a mixed refrigerant,
its composition changes if charged in a state of gas and normal system operation would no
longer be assured.
!
Before filling, check whether the tank has a siphon attached or not.
How to fill a tank with a siphon attached.
Other ways of filling the tank
!
Determine the amount of refrigerant to be added by referring to the table, write it down on
the included “Added Refrigerant” plate and attach it to the rear side of the front cover.
Note: refer to the example of connection for the amount to be added.
!
After the vacuum drying is finished, charge the additional refrigerant in its liquid state
through the liquid stop valve service port. Taking into account following instructions:
1.Check that gas and liquid stop valves are closed.
2.Stop the compressor and charge the specified weight of refrigerant.
!
If the outdoor unit is not in operation and the total amount cannot be charged, follow the
procedures for additional refrigerant charge shown below.
!
Make sure to use installation tools you exclusively use on R410A installations to withstand
the pressure and to prevent foreign materials from mixing into the system.
Notes:
!
Procedures for charging additional refrigerant.
There is a siphon tube
inside, so there is no need
to turn the tank upside-down.
Fill with the tank upright.
Fill with the tank upside-down.