Daikin VRV IV W+ Series Installer And User Reference Manual page 99

RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
4b The total amount of refrigerant
could not be charged by pre-
charging
INFORMATION
If the total additional refrigerant amount was reached in step 4 (by pre-charging
only), record the amount of refrigerant that was added on the additional refrigerant
charge label provided with the unit and attach it on the back side of the front panel.
Perform the test procedure as described in "21 Commissioning" [
Charging refrigerant
5 After pre-charging, connect valve A to the refrigerant charge port and charge
the remaining additional refrigerant through this port. Open all outdoor unit
stop valves. At this point, valve A must remain closed!
p < p >
A
b
R410A
a c
a Weighing scales
b Refrigerant R410A tank (siphon system)
c Vacuum pump
d Refrigerant charge port
A Valve A
INFORMATION
For a multi outdoor unit system, it is not required to connect all charge ports to a
refrigerant tank.
The refrigerant will be charged with ±22 kg in 1 hour time at an outdoor temperature
of 30°C DB or with ±6 kg at an outdoor temperature of 0°C DB.
If you need to speed up in case of a multiple outdoor system, connect the refrigerant
tanks to each outdoor unit.
NOTICE
▪
The refrigerant charging port is connected to the piping inside the unit. The unit's
internal piping is already factory charged with refrigerant, so be careful when
connecting the charge hose.
▪
After adding the refrigerant, do not forget to close the lid of the refrigerant
charging port. The tightening torque for the lid is 11.5 to 13.9 N•m.
▪
In order to ensure uniform refrigerant distribution, it may take the compressor
±10 minutes to start up after the unit has started operation. This is not a
malfunction.
The remaining additional refrigerant charge can be charged by operating the
outdoor unit by means of the manual refrigerant charge operation mode:
6 Take all the precautions mentioned in
"21 Commissioning" [
7 Turn on the power of the indoor units and outdoor unit.
If
Close valve B, disconnect the
manifold from the liquid line, and
perform steps 5~6.
d
4
128] into account.
18 Piping installation
|
Then
4
128].
4
"20 Configuration" [
Installer and user reference guide
116] and
99