Checking Refrigerant Piping: Setup; To Perform A Leak Test - Daikin VRV IV+ RXYTQ8U5YF Installer And User Manual

17 | Piping installation

17.3.3 Checking refrigerant piping: Setup

17.3.4 To perform a leak test

To check for leaks: Vacuum leak test
Installer and user reference guide
80
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 B
a
d
N2 R410A
b c e
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
Valve
Valve A
Valve B
Valve C
Liquid line stop valve
Gas 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 –⁠ 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.
g
f
C
Open
Open
Open
Close
Close
4
78]).
State of valve
"17.3.1 About checking the
VRV IV+ heat pump for high ambient temperatures
4P561157-1B – 2021.11
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