6
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Installation
Installer and user reference guide
60
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ heat pump
4P546228-1A – 2019.10
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
60].
6.5.2 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
"6.5.3 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.
6.5.3 Checking refrigerant piping: Setup
p< p>
R410A
N2
C
D
b
c
e
a
g
h
f
d
A
B
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
h
Equalising line stop valve (only for RYMQ)
A
Valve A
B
Valve B
C
Valve C
D
Valve D
Valve
State of valve
Valve A
Open
Valve B
Open
Valve C
Open
Valve D
Open
Содержание VRV IV+
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