Checking Refrigerant Piping: Setup; To Perform A Leak Test - Daikin RXYSA4A7V1B Installer And User Manual

18 | Piping installation

18.3.3 Checking refrigerant piping: Setup

18.3.4 To perform a leak test

To check for leaks: Vacuum leak test
To check for leaks: Pressure leak test
Installer and user reference guide
90
p < p >
A
a
d
N2 R32
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
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.
1 Evacuate the system from the liquid and gas piping to –⁠ 1 00.7 kPa (–⁠ 1 .007 bar)
(5 Torr absolute) 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.
1 Test for leaks by applying a bubble test solution to all piping connections.
2 Discharge all nitrogen gas.
3 Break the vacuum by pressurising with nitrogen gas to a minimum gauge
pressure of 0.2 MPa (2 bar). Never set the gauge pressure higher than the
maximum working pressure of the unit, i.e. 3.52 MPa (35,2 bar).
B
g
f
C
Open
Open
Open
Close
Close
State of valve
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1A – 2020.07