Daikin VRV - WII Service Manual page 143

Field Setting
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.
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 (R-410A) is charged.
Refrigerant containers shall be opened slowly.
Always use protective gloves and protect your eyes when charging refrigerant.
Additional refrigerant charge procedure (1)-normally
1. Before charging, check whether the tank has a siphon attached or not.
2. After the vacuum drying is finished, charge the additional refrigerant in its liquid state through
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This outside unit is factory charged with refrigerant and depending on pipe sizes and pipe
lengths some systems require additional charging of refrigerant.
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.
Charge the refrigerant to the liquid pipe in its liquid state. Since R-410A is a mixed refrigerant,
its composition changes if charged in a state of gas and normal system operation would no
longer be assured.
Make sure to use installation tools you exclusively use on R-410A installations to withstand the
pressure and to prevent foreign materials from mixing into the system.
How to charge with a siphon attached tank.
How to charge with other tank.
the liquid shutoff valve service port.
Taking into account following instructions:
Check that gas and liquid shutoff valves are closed.
Stop the compressor and charge the specified weight of refrigerant.
(If the outside unit is not in operation and the total amount cannot be charged, follow the
Additional refrigerant charge procedure (2) shown next page.)
Charge with the tank upright.
There is a siphon tube
inside, so there is no need
to turn the tank upside-down.
Charge with the tank upside-down.
SiUS30-604
Test Operation