18 | Piping installation
Installer and user reference guide
99
RXMLQ8 + RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543427-1A – 2020.10
NOTICE
During pre-charging, the refrigerant is charged through the liquid line. Close valve A
and disconnect the manifold from the gas line.
a Pressure reducing valve
b Nitrogen
c Weighing scales
d Refrigerant R410A tank (siphon system)
e Vacuum pump
f Liquid line stop valve
g Gas line stop valve
A Valve A
B Valve B
C Valve C
4 Do one of the following:
If Then
4a The calculated additional
refrigerant amount is reached by
above pre-charging procedure
Close valves C and B and disconnect
the manifold connection to the
liquid line.
4b The total amount of refrigerant
could not be charged by pre-
charging
Close valves C and B, disconnect the
manifold connection to the liquid
line, and perform steps 4~8.
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 "21Commissioning"[4133].
Charging refrigerant
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°CDB or with ±6kg at an outdoor temperature of 0°CDB.
If you need to speed up in case of a multiple outdoor system, connect the refrigerant
tanks to each outdoor unit.
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