16 Configuration
Installation and operation manual
20
FXMA-A
VRV system air conditioner
3P688304-1 – 2022.03
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 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.
Damaged equipment
Check the inside of the unit for damaged components or
squeezed pipes.
Field settings
Make sure all field settings you want are set. See
20].
15.2
To perform a test run
INFORMATION
▪ Perform the test run according to the instructions in the
outdoor unit manual.
▪ The test run is only completed if there is no malfunction
code displayed on the user interface or the outdoor unit
7‑segment display.
▪ See the service manual for the complete list of error
codes and a detailed troubleshooting guideline for each
error.
NOTICE
Do NOT interrupt the test run.
16
Configuration
16.1
Field setting
Make the following field settings so that they correspond with the
actual installation setup and with the needs of the user:
▪ External static pressure setting using:
▪ Airflow automatic adjustment setting
▪ User interface
▪ Air volume when thermostat control is OFF
▪ Time to clean air filter
▪ Thermostat sensor selection
▪ Thermostat differential changeover (if remote sensor is used)
▪ Differential for automatic changeover
▪ Auto-restart after power failure
▪ T1/T2 input setting
Setting: External static pressure
INFORMATION
▪ The fan speed of the indoor unit is preset to ensure the
standard external static pressure.
▪ To set a higher or lower external static pressure, reset
the initial setting with the user interface.
Settings for external static pressure can be achieved in 2 ways:
▪ Using the airflow automatic adjustment function
▪ Using the user interface
To set external static pressure by airflow automatic adjustment
function
NOTICE
▪ Do NOT adjust the dampers during the fan only
operation for airflow automatic adjustment.
▪ For the external static pressure higher than 100 Pa, do
NOT use airflow automatic adjustment function.
▪ If the ventilation paths have been changed, perform the
airflow automatic adjustment again.
▪ Test run MUST be done with a dry coil, run the unit for 2 hours
with fan only to dry the coil.
▪ Check if the power supply wiring, duct, air filter are properly
attached. If the closing damper is installed in the unit, make sure it
is open.
▪ If there is more than one air inlet and outlet, adjust the dampers so
that the airflow rate of each air inlet and outlet is conform with the
designed airflow rate.
1
Operate the unit in
fan only mode
prior to using the airflow
automatic adjustment function.
2
Stop
the air conditioning unit.
3
Set the value
number “—“ to 03 for
M
11(21) and
SW
7.
4
Start
the air conditioning unit.
Result:
The operation lamp lights up and the unit starts the fan
operation for airflow automatic adjustment.
5
After airflow automatic adjustment is finished (air conditioning
unit will stop) check if the value number “—“ is set to 02. If there
is no change, perform the setting again.
Setting content:
Then
(1)
M
SW
—
Airflow adjustment is OFF
11(21)
7
01
Completion of automatic airflow adjustment
02
Start of automatic airflow adjustment
03
To set external static pressure by the user interface
Check the indoor unit setting: the value number “—“ must be set to
01 for
M
11(21) and
SW
7.
1
Change the value number “—“ according to the external static
pressure of the duct to be connected as in table below.
(1)
Field settings are defined as follows:
•
M
: Mode number –
First number
: for group of units –
Number between brackets
: for individual unit
•
SW
: Setting number
• —: Value number
•
: Default
