17
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Piping installation
Installer and user reference guide
78
RXYTQ
VRV IV+ heat pump for high ambient temperatures
4P561157-1B – 2021.11
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).
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.
17.3 Checking the refrigerant piping
17.3.1 About checking the refrigerant piping
Refrigerant piping works are
finished?
The indoor units and/or
outdoor unit were already
powered ON?
Use procedure:
"Method 2: After power ON".
Finish piping work.
Use procedure:
"Method 1: Before power ON
(regular method)".
Yes
No
No
Yes
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.
