8 Commissioning
Installer and user reference guide
41
RWEYQ8~1 RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1 – 2017.04
Earth wiring
Be sure that the earth wires have been connected
properly and that the earth terminals are tightened.
Insulation test of the main power circuit
Using a megatester for 500 V, check that the insulation
resistance of 2 MΩ or more is attained by applying a
voltage of 500 V DC between power terminals and earth.
Never use the megatester for the transmission wiring.
Fuses, circuit breakers, or protection devices
Check that the fuses, circuit breakers, or the locally
installed protection devices are of the size and type
specified
in
the
chapter
. Be sure that neither a fuse nor
a protection device has been bypassed.
Internal wiring
Visually check the electrical component box and the
inside of the unit on 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 on 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.
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).
Inspect the
water filter
at the inlet piping of the outdoor
unit. Clean if it is dirty.
The
piping work
has been carried out according to this
document and the applicable legislation. Make sure that
following components are positioned at their correct
places:
▪ water filter,
▪ air purge valve,
▪ automatic water supply valve, and
▪ expansion tank.
Water circuit
Make sure that the water circuit is filled.
Water flow
Make sure that the calculated water flow rate can be
reached.
8.4
About test run
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.
In case Hydrobox units are present in the system, the pipe length
check and the refrigerant situation check will not be performed.
▪ Make sure to carry out the system test operation 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.
▪ 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 (e.g., Hydrobox) 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.
8.5
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
.
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
access mode 1 or 2" on page 36
. 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)
Cooling start up control
Cooling stable condition
Communication check
Stop valve check
