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15.1
Checklist before commissioning
1 After the installation of the unit, check the items listed below.
2 Close the unit.
3 Power up the unit.
You read the complete installation and operation
instructions, as described in the installer and user
reference guide.
The indoor unit is properly mounted.
The outdoor unit is properly mounted.
Make sure drain piping is properly installed, insulated
and drainage flows smoothly. Check for water leaks.
Possible consequence: Condensate water might drip.
The ducting is properly installed and insulated.
The refrigerant pipes (gas and liquid) are installed
correctly and thermally insulated.
There are NO refrigerant leaks.
There are NO missing phases or reversed phases.
The system is properly earthed and the earth terminals
are tightened.
The fuses or locally installed protection devices are
installed according to this document, and have NOT been
bypassed.
The power supply voltage matches the voltage on the
identification label of the unit.
There are NO loose connections or damaged electrical
components in the switch box.
There are NO damaged components or squeezed
pipes on the inside of the indoor and outdoor units.
The stop valves (gas and liquid) on the outdoor unit are
fully open.
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.
(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
FXMA-A
VRV system air conditioner
3P680922-1A – 2022.01
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:
▪ Bottom suction or rear suction installation
▪ 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: Bottom suction or rear suction installation
This setting must correspond with the installation type: rear suction
(default) or bottom suction.
If you have the installation
with...
Rear suction
Bottom suction
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.
16 Configuration
(1)
Then
M
SW
—
13(23)
11
01
02
Installation and operation manual
21
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