Daikin VRV 5-S Series - Checklist for Yearly Maintenance of the Outdoor Unit; About Service Mode Operation; To Use Vacuum Mode; To Recover Refrigerant

25 | Maintenance and service
Installer and user reference guide
146
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1D – 2023.02
25.2 Checklist for yearly maintenance of the outdoor unit
Check the following at least once a year:
▪ Heat exchanger
The heat exchanger of the outdoor unit can get blocked up due to dust, dirt,
leaves, etc. It is recommended to clean the heat exchanger yearly. A blocked
heat exchanger can lead to too low pressure or too high pressure leading to
worse performance.
25.3 About service mode operation
Refrigerant recovery operation/vacuuming operation is possible by applying setting
[2‑21]. Refer to "22.2Making field settings"[4122] for details how to set mode2.
When vacuuming/recovery mode is used, check very carefully what should be
vacuumed/recovered before starting. See installation manual of the indoor unit for
more information about vacuuming and recovery.
25.3.1 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.
25.3.2 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.