![background image](http://html1.mh-extra.com/html/daikin/vrv-5-s-series/vrv-5-s-series_installer-and-user-reference-manual_2459170089.webp)
18
|
Piping installation
Installer and user reference guide
89
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1 – 2020.01
▪
Performing vacuum drying to remove all moisture, air or nitrogen in the
refrigerant piping.
If there is a possibility of moisture being present in the refrigerant piping (for
example, water may have entered the piping), first carry out the vacuum drying
procedure below until all moisture has been removed.
All piping inside the unit has been factory tested for leaks.
Only field installed refrigerant piping needs to be checked. Therefore, make sure
that all the outdoor unit stop valves are firmly closed before performing leak test
or vacuum drying.
NOTICE
Make sure that all (field supplied) field piping valves are OPEN (not outdoor unit stop
valves!) before you start leak test and vacuuming.
For more information on the state of the valves, refer to
18.3.2 Checking refrigerant piping: General guidelines
Connect the vacuum pump through a manifold to the service port of all stop valves
to increase efficiency (refer to
"18.3.3 Checking refrigerant piping: Setup"
NOTICE
Use a 2-stage vacuum pump with a non-return valve or a solenoid valve that can
evacuate to a gauge pressure of –100.7 kPa (−1.007 bar)(5 Torr absolute).
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.
18.3.3 Checking refrigerant piping: Setup
p< p>
N2
C
b
c
e
a
g
f
d
A
B
R32
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
Summary of Contents for VRV 5-S Series
Page 161: ......
Page 162: ......
Page 163: ......
Page 164: ...4P600330 1 2020 01 Copyright 2020 Daikin Verantwortung f r Energie und Umwelt...