23
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Maintenance and service
Installer and user reference guide
121
RXYSQ4~6T8V/YB
VRV IV-S system air conditioner
4P482277-1B – 2020.10
23.3.1 To use vacuum mode
1
When the unit is at standstill, activate setting [2‑21] to start vacuuming mode.
Result:
When confirmed, the indoor and outdoor unit expansion valves will
fully open. At that moment H1P lights and the user interface of all indoor units
indicate TEST (test operation) and
(external control) and the operation
will be prohibited.
2
Evacuate the system with a vacuum pump.
3
Press BS1 to stop vacuuming mode.
23.3.2 To recover refrigerant
This should be done with a refrigerant recovery unit. Follow the same procedure as
for vacuuming method.
DANGER: RISK OF EXPLOSION
Pump down – Refrigerant leakage.
If you want to pump down the system, and there
is a leak in the refrigerant circuit:
▪
Do NOT use the unit's automatic pump down function, with which you can collect
all refrigerant from the system into the outdoor unit.
Possible consequence:
Self-
combustion and explosion of the compressor because of air going into the
operating compressor.
▪
Use a separate recovery system so that the unit's compressor does NOT have to
operate.
NOTICE
Make sure to NOT recover any oil while recovering refrigerant.
Example:
By using an
oil separator.