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14.2.7
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.
p <
p >
A
B
f
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
A
Valve A
B
Valve B
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 gas, liquid and equalising stop
valve pipes along the black line. Use an appropriate tool (e.g. a
pipe cutter).
RXYTQ
VRV IV+ heat pump for high ambient temperatures
4P546223-1C – 2021.11
g
WARNING
NEVER remove the spun piping by brazing.
Any gas or oil remaining inside the stop valve may blow off
the spun piping.
6 Wait until all oil has dripped out before continuing with the
connection of the field piping in case the recovery was not
complete.
14.3
Checking the refrigerant piping
14.3.1
About checking the refrigerant piping
Refrigerant piping works are
finished?
No
Yes
The indoor units and/or
outdoor unit were already
No
powered ON?
Yes
Use procedure:
"Method 2: After power ON".
It is very important that all refrigerant piping work is done before the
units (outdoor or indoor) are powered on. When the units are
powered on, the expansion valves will initialise. This means that the
valves will close.
NOTICE
Leak test and vacuum drying of field piping and indoor
units is impossible when field expansion valves are closed.
Method 1: Before power ON
If the system has not yet been powered on, no special action is
required to perform the leak test and the vacuum drying.
Method 2: After power ON
If the system has already been powered on, activate setting [2‑21]
(refer to
"16.1.4 To access mode 1 or
open field expansion valves to guarantee a refrigerant piping
pathway and make it possible to perform the leak test and the
vacuum drying.
DANGER: RISK OF ELECTROCUTION
NOTICE
Make sure that all indoor units connected to the outdoor
unit are powered on.
NOTICE
Wait to apply setting [2‑21] until the outdoor unit has
finished the initialisation.
Leak test and vacuum drying
Checking the refrigerant piping involves:
▪ Checking for any leakages in the refrigerant piping.
14 Piping installation
Finish piping work.
Use procedure:
"Method 1: Before power ON
(regular method)".
2" [ 4 29]). This setting will
Installation and operation manual
19
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Troubleshooting
