Daikin VRV 5 RXYA8A7Y1B Installer And User Manual page 121

RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
Pre-charging refrigerant
1 Calculate the additional amount of refrigerant to be added using the formula
mentioned in "19.3 To determine the additional refrigerant
Note: The first 10 kg of additional refrigerant can be pre-charged without outdoor
unit operation.
Note: Pre-charging can be done without compressor operation
Prerequisite: Make sure that all outdoor unit stop valves and manifold valve A are
closed. Disconnect the manifold from the gas lines.
2 Connect the manifold valve B to the service port of the liquid stop valve.
3 Pre‑charge refrigerant until the determined additional refrigerant amount is
reached or pre‑charging is not possible anymore.
p < p >
B
b
R32
a c
a Weighing scales
b Refrigerant R32 tank (siphon system)
c Vacuum pump
d Liquid line stop valve
B Valve B
4 Do one of the following:
If
a The determined additional
refrigerant amount is not
reached yet
b The determined additional
refrigerant amount is
reached
c Too much refrigerant is
charged
Charging refrigerant
The remaining additional refrigerant charge can be charged by operating the
outdoor unit by means of the manual additional refrigerant charge mode.
5 Connect as shown. Make sure valve A is closed. Open all outdoor unit stop
valves.
p < p >
A
b
R32
a c
a Weighing scales
d
Close valve B and disconnect the manifold
from the liquid line.
Continue with the "Charging refrigerant"
procedure as described below.
Close valve B and disconnect the manifold
from the liquid line.
You do not have to perform the "Charging
refrigerant" instructions described below.
Recover refrigerant.
Disconnect the manifold from the liquid line.
You do not have to perform the "Charging
refrigerant" instructions described below.
d
19 Charging refrigerant
|
4
amount" [
Then
Installer and user reference guide
117].
121