19 Commissioning
Installation and operation manual
47
REMA5+REYA8~20A7Y1B
VRV 5 heat recovery
4P684060-1 – 2022.02
Internal wiring
Visually check the electrical component box and the
inside of the unit for loose connections or damaged
electrical components.
Pipe size and pipe insulation
Be sure that correct pipe sizes are installed and that the
insulation work is properly executed.
Stop valves
Be sure that the stop valves are open on both liquid and
gas side.
Damaged equipment
Check the inside of the unit for damaged components or
squeezed pipes.
Refrigerant leak
Check the inside of the unit on refrigerant leakage. If there
is a refrigerant leak, try to repair the leak. If the repair is
unsuccessful, call your local dealer. Do not touch any
refrigerant which has leaked out from refrigerant piping
connections. This may result in frostbite.
Oil leak
Check the compressor for oil leakage. If there is an oil
leak, try to repair the leak. If the repairing is unsuccessful,
call your local dealer.
Air inlet/outlet
Check that the air inlet and outlet of the unit is NOT
obstructed by paper sheets, cardboard, or any other
material.
Additional refrigerant charge
The amount of refrigerant to be added to the unit shall be
written on the included "Added refrigerant" plate and
attached to the rear side of the front cover.
Requirements for R32 equipment
Make sure the system meets all requirements that are
described in the following chapter:
equipment using R32 refrigerant"
10].
Field settings
Make sure all field settings you want are set. See
Installation date and field setting
Be sure to keep record of the installation date on the
sticker on the rear of the upper front panel according to
EN60335‑2‑40 and keep record of the contents of the field
setting(s).
19.3
Checklist during commissioning
To perform a
BS
unit
test run
. See the BS unit
installation manual for more information.
To perform a
test run
.
To perform a
BS/indoor unit connection check
(optional).
19.4
About the BS unit test run
The BS unit test run has to be performed on all BS units in the
system, before the test run of the outdoor unit. The BS 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 BS unit test run and confirm the result,
because the test run of the outdoor unit checks this confirmation for
all BS units in the system. See the BS unit installation and operation
manual for more information.
NOTICE
It is very important that all refrigerant piping work is done
before the units (outdoor, BS or indoor) are powered on.
When the units are powered on, the expansion valves will
initialise. This means that the valves will close.
If any part of the system has already been powered on,
setting [2-21] on the outdoor unit has to be activated to
open the expansion valves.
19.5
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 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.
19.6
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
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
43]. 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:
Step
Description
Control before start up (pressure equalisation)
