Daikin VRV IV W+ Series Installer And User Reference Manual page 90

18 | Piping installation
Installer and user reference guide
90
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
h High pressure/low pressure gas line stop valve
A Valve A
B Valve B
(1)
C Valve C
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
Heat pump 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
C D
(1)
g
f
h
c
b
a b
Heat recovery system
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
c