18 | Piping installation
Installer and user reference guide
91
REYQ8~20+REMQ5U7Y1B
VRV IV+ heat recovery
4P561154-1A – 2020.10
18.2.11 To remove the spun pipes
WARNING
Any gas or oil remaining inside the stop valve may blow off the spun piping.
If these instructions are NOT followed correctly it may result in property damage or
personal injury, which may be serious depending on the circumstances.
Use the following procedure to remove the spun piping:
1 Make sure that the stop valves are fully closed.
2 Connect the vacuuming/recovery unit through a manifold to the service port
of all stop valves.
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
D Valve D
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 lower part of the liquid-, gas-, and high pressure/low pressure gas
stop valve pipes along the black line. Use an appropriate tool (e.g. a pipe
cutter).
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