Specifications
RXYQQ8~20T7Y1B
VRV IV System Air Conditioner
4P345099-1 – 2013.04
Installation and operation manual
43
No matter which control is selected, variations on the behaviour of
the system are still possible due to protection controls to keep the
unit operating under reliable conditions. The intentional target,
however, is fixed and will be used to obtain the best balance between
energy consumption and comfort, depending on the application type.
15.4. Test operation
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.
15.4.1. Precautions before starting test operation
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.
Provide a logbook and machine card.
In accordance with the applicable legislation, it may be
necessary to provide a logbook with the equipment containing at
least: info on maintenance, repair work, results of tests, stand-by
periods, …
15.4.2. Test operation
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).
Check of the stop valves opening.
Judgement of piping length.
On top of this system test operation, indoor units operation should
also be checked separately.
Make sure to carry out the system test operation after the first
installation. Otherwise, the malfunction code U3 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 concerning the individual test run.
Procedure
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
"15.2. Monitoring function and field settings" on page 37.
3 Turn ON the power to the outdoor unit and the connected indoor
units.
4 Make sure the default (idle) situation is existing; see
"13.2. Operating the push buttons and DIP switches on the logic
board" on page 29. Push BS2 for 5 seconds or more. The unit
will start test operation.
The test operation is automatically carried out, the outdoor
unit display will indicate "t01" and the indication "Test
operation" and "Under centralized control" will display on the
user interface of indoor units.
Steps during the automatic system test run procedure:
-"t01": control before start up (pressure equalization)
-"t02": cooling start up control
-"t03": cooling stable condition
-"t04": communication check
-"t05": stop valve check
-"t06": pipe length check
-"t07": refrigerant amount check
-"t09": pump down operation
-"t10": unit stop
During the test operation, it is not possible to stop the unit
operation from a user interface. To abort the operation, press
BS3. The unit will stop after ±30 seconds.
CAUTION
Do not insert fingers, rods or other objects into the air inlet
or outlet. When the fan is rotating at high speed, it will
cause injury.
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.
CAUTION
During tests never pressurize the appliances with a
pressure higher than the maximum allowable
pressure (as indicated on the nameplate of the unit).
If refrigerant gas leaks, ventilate the area immediately.
Toxic gas may be produced if refrigerant gas comes
into contact with fire.
Never directly touch any accidental leaking
refrigerant. This could result in severe wounds caused
by frostbite.
Test run is possible for ambient temperatures between
–20°C and 35°C.
DANGER: Do not touch piping and internal parts.
See "2. General safety precautions" on page 2.
DANGER: Electrical shock
See "2. General safety precautions" on page 2.
INFORMATION
Note that during the first running period of the unit,
required power input may be higher. This phenomenon
originates from the compressor that requires a 50 hour run
elapse before reaching smooth operation and stable power
consumption. Reason is that the scroll is made out of iron
and that it takes some time to smooth the surfaces that
make contact.
NOTICE
To protect the compressor, be sure to turn on the power
supply 6 hours before starting operation.
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.
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.