19 | Commissioning
Installer and user reference guide
116
RKXYQ5T8+8T7Y1B + RDXYQ5T8+8T7V1B
VRV IV heat pump for indoor installation
4P499898-1B – 2021.12
Insulation and air leaks
Make sure the unit is fully insulated and checked for air leaks.
Possible consequence: Condensate water might drip.
Drainage
Make sure drainage flows smoothly.
Possible consequence: Condensate water might drip.
External static pressure
Make sure the external static pressure is set.
Possible consequence: Insufficient cooling or heating.
19.3 Checklist during commissioning
To perform a test run.
19.3.1 About the 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 of wrong wiring (communication check with indoor units and heat
exchanger unit).
▪ Check of the stop valves opening.
▪ Check of wrong piping. Example: Gas or liquid pipes switched.
▪ 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.
19.3.2 To perform a test run (7-LEDs display)
(in case of 5HP)
1 Make sure all field settings you want are set; see "18.2 Making field
settings"[499].
2 Turn ON the power to the compressor unit, heat exchanger unit, and the
connected indoor units.
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