Daikin VRV 5 - 22.6 About the system test run

22 | Commissioning
Installer and user reference guide
149
RXYSA8~12AMY1B
VRV 5-S system air conditioner
4P752782-1A – 2024.02
To perform a SV/indoor unit connection check (optional).
22.5 About the SV unit test run
The SV unit test run has to be performed on all SV units in the system, before the
test run of the outdoor unit. The SV unit test run has to confirm that the required
safety measures are properly installed. Even when no safety measures are
required, it is necessary to perform this SV unit test run and confirm the result,
because the test run of the outdoor unit checks this confirmation for all SV units in
the system. See the SV unit installation and operation manual for more
information.
NOTICE
It is very important that all refrigerant piping work is done before the units (outdoor,
SV or indoor) are powered. When the units are powered, the expansion valves
initialise. This means that the valves close.
If any part of the system had already been powered before, FIRST activate setting
[2-21] on the outdoor unit to open the expansion valves again THEN power off the
unit to conduct the SV unit test run.
22.6 About the system test run
NOTICE
Make sure to carry out the test run after the first installation. Otherwise, the
malfunction code will be displayed on the user interface and normal operation or
individual indoor unit test run cannot be carried out.
The procedure below describes the test operation of the complete system. This
operation checks and judges following items:
▪ Check for incorrect wiring (communication check with indoor units).
▪ Check of the stop valves opening.
▪ Judgement of piping length.
▪ 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.
22.6.1 To perform a test run
1 Close all front panels to prevent misjudgement.
2 Make sure all field settings you want are set; see "21.1 Making field
settings"[4129].