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14 - MAINTENANCE
14.3 - Access to the main components
14.3.1 - Air coil
■ Check that the coil is free from dust and grease.
■ Cleaning the accumulated dust on the coil can be performed
using a soft-bristled brush or a vacuum cleaner perpendicular
to the fi ns or with a low-pressure water cleaner. Grease can be
removed with water with degreaser. Do not put stress on the
fi ns as they could deform.
Use safety gloves for this task. Take care with the sharp
parts of the coil.
Outdoor coil protection grid (optional)
A protective grid can be fi tted to the coil.
This grid, fi xed with M6 Allen screws, must be removed to
clean the coil.
M6 Allen
screws
14.3.2 - Supply fan in «In-line» units
■ The terminal block of the motor is accessed from the outdoor
unit. For that the next panel must be removed:
14.3.3 - Condensate drain pan
■ These units are equipped with a condensate drainage pan sloped
toward the drain. This pan is removable for easy cleaning. It is
secured to the unit using 4 M6 Allen screws.
■ Check that the condensate pan is suffi ciently clean.
■ Check that the drain is not clogged.
■ Cleaning of the pan can be done with water and non-abrasive
detergent.
14.3.4 - Compressor
■ In the case of compressor replacement:
■ Disconnect the unit from power supply.
■ Completely empty the refrigerant charge using a specifi c
recovery unit for R-410A
■ Disconnect electrically the compressor.
■ Carefully unsolder the suction and discharge piping.
■ The compressor is fi xed onto the platform with 4 screws.
■ Unscrew the fi xings.
■ Place the new compressor and check that it has a suffi cient
oil charge.
Warning: when tightening the compressor screws, please
consult the maximum torque that can be applied.
If a torque wrench is not available,tighten them until they are
snug then tighten a further ¾ turn.
■ Solder the suction and discharge piping.
■ Connect the compressor in accordance with the wiring diagram.
■ Make vacuum and next, reload the gas into the unit according
to charge data provided in the table of paragraph 14.1 "General
recommendations" and in the unit's data plate.
N.b.: For some maintenance tasks, it may be convenient to access
the outdoor unit by lifting the cover with the fan(s). Consult the lift
procedure in the chapter "Fans and air ducts".
14.3.5 - Dryer fi lter
■ The fi lter function is the preserve the cooling circuit clean and
without humidity, neutralizing the acids that can be found in
the cooling circuit.
■ Measure the diff erence in the temperature of the pipes at the
dryer inlet and outlet.
■ If necessary, replace.
M6 Allen
screws
Access
panel
Compressors
in tandem
Filter dryer
65
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