Daikin VRV-WIII RWEYQ72PTJU Service Manual page 132

Field Setting from Condensing Unit
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.
 This condensing 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.
Additional refrigerant charge procedure (1) - normally
 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.
1. Before charging, check whether the tank has a siphon attached or not.
How to charge with a siphon attached tank.
How to charge with other tank.
2. 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:
 Check that gas and liquid stop valves are closed.
 Stop the compressor and charge the specified weight of refrigerant.
(If the condensing unit is not in operation and the total amount cannot be charged, follow the Additional refrigerant
charge procedure (2) shown next page.)
124
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.
SiUS30-1301
Field Setting