Daikin VRV 5 RXYA8A7Y1B, Инструкция по установке и эксплуатации

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24 | Maintenance and service
Installer and user reference guide
174
RYMA5+RXYA8~20A7Y1B
VRV 5 heat pump
4P749918-1 – 2023.12
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
153] must be
applied on the VRV 5 heat pump outdoor unit. For more information, see
"21.1.8 Mode 2: field settings" [
4
148].
If field setting "[2‑45]" [
4
153] 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.