20
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Commissioning
Installer and user reference guide
132
R R8T7V1B
VRV IV heat pump for indoor installation
4P499898-1A – 2020.10
Abnormalities on indoor units cannot be checked for each unit separately. After
the test operation is finished, check the indoor units one by one by performing a
normal operation using the user interface. Refer to the indoor unit installation
manual for more details concerning the individual test run.
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.
20.4.2 To perform a test run (7-LEDs display)
(in case of 5 HP)
1
Make sure all field settings you want are set; see
2
Turn ON the power to the compressor unit, heat exchanger 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.
3
Make sure the default (idle) situation is existing (H1P is OFF); see
110]. Push BS4 for 5 seconds or more. The unit will start test
operation.
Result:
The test operation is automatically carried out, the compressor unit
H2P flashes 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:
Step
Description
Control before start up (pressure equalisation)
Cooling start up control
Cooling stable condition
Communication check
Stop valve check
Pipe length check
Pump down operation
Unit stop
INFORMATION
During the test operation, it is not possible to stop the unit operation from a user
interface. To abort the operation, press BS3. The unit will stop after ±30 seconds.
4
Check the test operation results on the compressor unit 7‑LEDs display.
