7 Maintenance and service
Installation and operation manual
11
FXMA-A
VRV system air conditioner
3P688304-1 – 2022.03
Icon
Operation mode
Fan only.
In this mode, air circulates without heating
or cooling.
Auto.
In Auto mode, the indoor unit automatically
switches between heating and cooling mode, as
required by the setpoint.
6.2.2
Special heating operation modes
Operation
Description
Defrost
To prevent a loss of heating capacity due to frost
accumulation in the outdoor unit, the system will
automatically switch to defrost operation.
During defrost operation, the indoor unit fan will stop
operation, and the following icon will appear on the
home screen:
The system will resume normal operation after
approximately 6 to 8 minutes.
Hot start
During hot start, the indoor unit fan will stop
operation, and the following icon will appear on the
home screen:
6.3
To operate the system
INFORMATION
For setting of the operation mode or other settings, see the
reference guide or operation manual of the user interface.
7
Maintenance and service
7.1
Precautions for maintenance and
service
CAUTION
See
7] to acknowledge all
related safety instructions.
NOTICE
Maintenance MUST be done by an authorised installer or
service agent.
We recommend performing maintenance at least once a
year. However, applicable legislation might require shorter
maintenance intervals.
NOTICE
NEVER inspect or service the unit by yourself. Ask a
qualified service person to perform this work. However, as
end user, you may clean the air filter and air outlet.
NOTICE
Do NOT wipe the controller operation panel with benzine,
thinner, chemical dust cloth, etc. The panel may get
discoloured or the coating peeled off. If it is heavily dirty,
soak a cloth in water-diluted neutral detergent, squeeze it
well and wipe the panel clean. Wipe it with another dry
cloth.
Following symbols may occur on the indoor unit:
Symbol
Explanation
Measure the voltage at the terminals of main circuit
capacitors or electrical components before servicing.
DANGER: RISK OF ELECTROCUTION
Disconnect the power supply for more than 10 minutes,
and measure the voltage at the terminals of main circuit
capacitors or electrical components before servicing. The
voltage MUST be less than 50 V DC before you can touch
electrical components. For the location of the terminals,
see the warning label for persons performing service and
maintenance.
a
b
c
C+
C-
a
a
Residual voltage measuring points (C-, C+)
b
Printed circuit board
c
Control box
7.2
Cleaning the air filter and air outlet
CAUTION
Turn off the unit before cleaning the air filter and air outlet.
NOTICE
▪ Do NOT use gasoline, benzene, thinner polishing
powder or liquid insecticide.
Possible consequence:
Discoloration and deformation.
▪ Do NOT use water or air of 50°C or higher.
Possible
consequence:
Discoloration and deformation.
7.2.1
To clean the air filter
INFORMATION
Air filter for this unit is an optional equipment. Refer to the
option list for available air filter option for your unit.
When to clean the air filter:
▪ Rule of thumb: Clean every 6 months. If the air in the room is
extremely contaminated, increase the cleaning frequency.
▪ Depending on the settings, the user interface can display the
"Time to clean filter"
notification. Clean the air filter when the
notification displays.
▪ If the dirt becomes impossible to clean, change the air filter
(= optional equipment).
How to clean the air filter:
