Daikin VRV 5 - To Use Vacuum Mode; To Recover Refrigerant; Before the Maintenance and Service of a System with SV Unit; Unit Maintenance and Service Label

24 | Maintenance and service
Installer and user reference guide
157
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A – 2024.02
24.3.1 To use vacuum mode
1 When the unit is at standstill, set the unit in [2‑21]=1.
Result: When confirmed, the indoor and outdoor unit expansion valves will
fully open. At that moment the 7‑segment display indication= 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 BS3 to stop vacuuming mode.
24.3.2 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.
24.3.3 Before the maintenance and service of a system with SV unit
Before starting the maintenance and service, field setting "[2‑45]"[4139] must be
applied on the outdoor unit. For more information, see "21.1.7 Mode 2: field
settings"[4135].
If field setting "[2‑45]" [4 139] is applied, the shut-off valves of the SV unit will
close. The compressor, outdoor fan and indoor unit will stop operating and the 7-
segment display will show code " ".
To confirm the full closure of the shut-off valves, " " will be shown on the 7-
segment display of the outdoor unit .
The system power supply must be turned off for maintenance.
24.4 SV unit maintenance and service label
WARNING
Never power off the unit for maintenance and service before the shut-off valves are
closed.