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Piping installation
Installer and user reference guide
90
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
p< p>
R410A
N2
b
c
e
a
f
g
h
d
A
C
(1)
D
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
High pressure/low pressure gas line stop valve
A
Valve A
B
Valve B
C
Valve C
(1)
D
Valve D
(1) Only for heat recovery system.
NOTICE
Do not connect the vacuum pump to the suction gas stop valve if the unit is intended
to run as a heat pump system. This will increase the risk of unit failure.
3
Recover gas and oil from the spun piping by using a recovery unit.
CAUTION
Do not vent gases into the atmosphere.
4
When all gas and oil is recovered from the spun piping, disconnect the charge
hose and close the service ports.
5
Cut off the upper part of the following pipes with an appropriate tool (e.g. a
pipe cutter):
a
c
b
a
c
b
Heat pump system
Heat recovery system
a
High pressure/low pressure gas stop valve
b
Suction gas stop valve (ONLY use in case of heat recovery system)
c
Liquid stop valve