Daikin VRV EMERION RXYQ-AATJA Service Manual page 212

Field Setting from Outdoor Unit
[2-90]:
205
Indoor unit without power
U4 error generation.
In case an indoor unit needs maintenance or repair on the electric side, it is possible to
keep the rest of the VRV DX indoor units operating without power supply to some indoor
unit(s).
Default value: 0 (not active)
Field setting 1: It is possible to operate system without U4 error when some indoor units
are temporarily without power supply.
Field setting 2: It is possible to operate system with U4 warning when some indoor units
are temporarily without power supply.
Following conditions need to fulfil:
 Maximum equivalent piping length of the farthest indoor less than 120 m (394 ft).
 Total index of indoor units without power supply is less than 30% of the nominal
outdoor.
 Total capacity of indoor units without power supply is less than 30% of the nominal
one of the outdoor unit.
 Operation time is limited to 24 hours period.
 It is recommended to shut down connected indoor units at the same floor.
 Not possible to use service mode operation (e.g. recovery mode) or BP unit/Hydro
unit connection.
 Backup operation has priority over this special feature.
SiUS342303E
Part 5 Field Settings and Test Operation