Checking Refrigerant Piping: Setup; To Perform A Leak Test - Daikin VRV 5-S User Reference 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
104
NOTICE
Make sure the pump oil does not flow oppositely into the system while the pump is
not working.
NOTICE
Do NOT purge the air with refrigerants. Use a vacuum pump to evacuate the
installation.
p < p >
A
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
A Valve A
B Valve B
C Valve C
Valve A
Valve B
Valve C
Liquid line stop valve
Gas line stop valve
NOTICE
Indoor units should also be leak and vacuum tested. Keep any possible (field
supplied) field piping valves open as well.
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.
3 Should the pressure rise, the system may either contain moisture (see vacuum
drying below) or have leaks.
B
g
f
C
Valve Status
Open
Open
Open
Close
Close
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A – 2024.02