Checking Refrigerant Piping: Setup; To Perform A Leak Test - Daikin VRV 5 RXYA8A7Y1B Installer And User Manual

18 | Piping installation

18.3.3 Checking refrigerant piping: Setup

18.3.4 To perform a leak test

Vacuum leak test
Installer and user reference guide
112
NOTICE
Do NOT purge the air with refrigerants. Use a vacuum pump to evacuate the
installation.
p < p >
A B
a
d
N R32
2
b c e
a Pressure reducing valve
b Nitrogen
c Weighing scales
d Refrigerant R32 tank (siphon system)
e Vacuum pump
f Liquid line stop valve
g Gas line stop valve
h Equalising line stop valve (for multi outdoor unit setup)
A Valve A
B Valve B
C Valve C
D Valve D
Valve A
Valve B
Valve C
Valve D
Liquid line stop valve
Gas line stop valve
Equalising line stop valve
NOTICE
The connections to the indoor units and all indoor units should also be leak and
vacuum tested. Keep any possible (field supplied) field piping valves open as well.
Refer to the indoor unit installation manual for more details. Leak test and vacuum
drying should be done before the power supply is set to the unit. If not, see also the
flow chart earlier described in this chapter (see
refrigerant piping" [
The leak test must satisfy the specifications of EN378‑2.
1 Evacuate the system from the liquid and gas piping to a gauge pressure of
–⁠ 1 00.7 kPa (–⁠ 1 .007 bar) for more than 2 hours.
2 Once reached, turn off the vacuum pump and check that the pressure does
not rise for at least 1 minute.
C D
h
g
f
Valve
4
110]).
Status
Open
Open
Open
Open
Close
Close
Close
"18.3.1 About checking the
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12