Daikin VRV IV - 21.5 To Perform a Test Run

21 | Commissioning
Installer and user reference guide
136
RXMLQ8 + RXYLQ10~14T7Y1B*
VRV IV system air conditioner
4P543427-1A – 2020.10
INFORMATION
▪ It may take 10 minutes to achieve a uniform refrigerant state before the
compressor starts.
▪ During the test operation, the refrigerant running sound or the magnetic sound
of a solenoid valve may become loud and the display indication may change.
These are not malfunctions.
21.5 To perform a test run
1 Close all front panels in order to not let it be the cause of misjudgement
(except the electrical component box inspection opening service cover).
2 Make sure all field settings you want are set; see "20.2 Making field
settings"[4113].
3 Turn ON the power to the outdoor unit and the connected indoor units.
NOTICE
Be sure to turn ON the power 6 hours before operation in order to have power
running to the crankcase heater and to protect the compressor.
4 Make sure the default (idle) situation is existing; see "To access mode 1 or
2"[4116]. Push BS2 for 5 seconds or more. The unit will start test operation.
Result: The test operation is automatically carried out, the outdoor unit
display will indicate " " and the indication "Test operation" and "Under
centralised control" will display on the user interface of indoor units.
Steps during the automatic system test run procedure:
In case:
▪ Setting [2-4]=0
▪ OR room temperature ≥25°C:
Step Description
Control before start up (pressure equalisation)
Cooling start up control
Cooling stable condition
Communication check
Stop valve check
Pipe length check
Refrigerant amount check (NOT in case of Hydrobox, RA
or AHU connection)
Unit stop
In case:
▪ Setting [2-4]=1 or 2
▪ AND room temperature <25°C:
Step Description
Control before start up (pressure equalisation)
Heating start up control