7 Commissioning
Installation and operation manual
29
RYYQ+RYMQ+RXYQ8~20T7Y1B
VRV IV system air conditioner
4P370473-1C – 2016.07
6.2
Using the leak detection function
6.2.1
About automatic leak detection
The (automatic) leak detection function is not by default activated.
The (automatic) leak detection function can only start working when
both below conditions are fulfilled:
▪ The additional refrigerant charge was inputted in the system's
logic (see [2‑14]).
▪ The system test run was executed (see
), including the detailed refrigerant situation check.
The leak detection operation can be automated. By changing
parameter [2‑85] to chosen value, the interval time or the time till the
next automatic leak detection operation can be chosen. The
parameter [2‑86] defines whether the leak detection operation is
executed one time (within [2‑85] days) or intermittent, respecting an
interval of [2‑85] days.
Availability of the leak detection function feature requires input of the
additional refrigerant charge amount immediately after finishing the
charging. The input must be executed before performing the test
operation.
NOTICE
If a wrong value is input for the additional charged
refrigerant weight, the accuracy of the leak detection
function will decrease.
INFORMATION
▪ The weighed and already recorded amount of
additional refrigerant charge (not the total amount of
refrigerant present in the system) must be entered.
▪ The leak detection function is not available when
Hydrobox units or RA DX indoor units are connected to
the system.
▪ When the height difference between indoor units is
≥50/40 m, the leak detection function can not be used.
7
Commissioning
After installation and once the field settings are defined, the installer
is obliged to verify correct operation. Therefore a test run must be
performed according to the procedures described below.
7.1
Precautions when commissioning
CAUTION
Do not perform the test operation while working on the
indoor units.
When performing the test operation, not only the outdoor
unit, but the connected indoor unit will operate as well.
Working on an indoor unit while performing a test operation
is dangerous.
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.
During test operation, the outdoor unit and the indoor units will start
up. Make sure that the preparations of all indoor units are finished
(field piping, electrical wiring, air purge, ...). See installation manual
of the indoor units for details.
7.2
Checklist before commissioning
After the installation of the unit, first check the following items. Once
all below checks are fulfilled, the unit must be closed, only then can
the unit be powered up.
You read the complete installation and operation
instructions, as described in the
installer and user
reference guide
.
Installation
Check that the unit is properly installed, to avoid abnormal
noises and vibrations when starting up the unit.
Field wiring
Be sure that the field wiring has been carried out
according to the instructions described in the chapter
"5.7 Connecting the electrical wiring" on page 22
according to the wiring diagrams and according to the
applicable legislation.
Power supply voltage
Check the power supply voltage on the local supply panel.
The voltage must correspond to the voltage on the
identification label of the unit.
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.
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