Daikin VRV IV+, Service Manual

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4 | Third party components
Service manual
371
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
4 Activate refrigerant recovery / vacuum mode by setting field setting mode
2-21 to 1 (see
"6.9 Field settings" [
4
455]).
To make sure that refrigerant cycle is completely connected and there are no
dead-zones because of closed expansion- or solenoid valves, entering the
refrigerant recovery / vacuum mode ensures that:
- All indoor unit expansion valves get fully opened,
- all outdoor unit expansion valves get fully opened,
- the necessary solenoid valves get fully opened.
5 To add refrigerant, see "4.2.2 Repair procedures" [
4
368].
Is the problem solved? Action
Yes No further actions required.
No Return to the troubleshooting of the
specific error and continue with the
next procedure.
To add refrigerant
1 See the installer reference guide for the correct procedure.
Is the problem solved? Action
Yes No further actions required.
No Perform a pressure test of the
refrigerant circuit, see
"4.2.1 Checking
procedures" [
4
363].
Repair information
Refrigerant piping handling
▪ Make sure that the applied pressure is never higher than the unit design pressure
indicated on the nameplate (PS).
▪ Work according to the F‑gas regulation and/or local regulations.
▪ Make sure the correct amount of refrigerant is charged after repair according to
the F‑gas regulation label on the unit (f additional where required).
▪ Make sure to use the appropriate equipment and tools according to the
refrigerant and unit type.
▪ Charge non‑azeotropic refrigerant (e.g. R410A) always in a liquid state.
▪ Make sure to use a digital scale (no charging cylinder).
▪ Execute correct vacuum drying procedure after repair:
- –0.1 MPa / –760 mm Hg / –750 Torr / –1 bar for at least 1 hour.
- Connect the unit according to the available service ports.
- Use related field setting where necessary to open expansion valve / solenoid
valve.
Refrigerant piping repair
▪ Make sure to cover open pipe ends during repair so no dust or moisture can
enter.
▪ Make sure to re‑apply insulation removed during repair.