Manual code 75803707A.0708
Page 50 of 64
11.2 MAINTENANCE OF THE FANS
Fan maintenance operations must be carried out in conditions of maximum safety and always with the unit
switched off
During maintenance, check the following:
• Periodically check that the fan blades are clean and remove all dirt and encrusted deposits that could
affect the balance of the rotor and thus damage the bearings.
• Check that the cooling fins of the fan motors are clean. If the fans produce any unusual noises during
operation, switch off the machine and identify and rectify the problem, renewing the fan or the motor if
necessary.
11.3 REFRIGERATION CIRCUIT CHECKS
The refrigeration circuit does not require maintenance other than the periodic checks indicated the chapter
“Start up”.
The first of these checks is to look for leaks, as indicated by the presence of small bubbles visible in the liquid
viewed through the sight glass.
The cooling coil must be inspected and, if necessary, cleaned with hot soapy water using a brush with long soft
bristles. Compressed air may also be used providing that it is free of oil.
11.4 MAINTENANCE OF THE ELECTRICAL BATTERY
It is sufficient to check that the battery is clean and that the power consumption in Amps is as specified in the
technical data sheet. If the machine is equipped with a modulating electrical battery, it is advisable to also check
occasionally that the modulator is functioning correctly. To do this, it is sufficient to check that the machine behaves
correctly during heating operation, with the relative screen page showing a voltage of 0-10 V for the microprocessor
control output to the modulator. (See User Manual).
11.5 MAINTENANCE OF THE ELECTRICAL PANEL
Clean using a compressed air jet at a minimum distance of 30 cm (to avoid damaging plastic parts), pay
particular attention to cooling fans and heat sinks.
11.6 MAINTENANCE OF THE AIR FILTERS
On TECNAIR LV air conditioners, all air filters are equipped with differential pressure switches to monitor
pressure loss caused by clogging. The microprocessor signals when the measured pressure difference exceeds the set
value. To change the trip setting of a differential pressure switch, simply unscrew the cover and turn the setting dial to the
desired pressure differential value.
FILTER TYPE POSITION VALUE [Pa]
G4 filter
Suction 120
G4 filters cannot be regenerated and therefore must be renewed.
NOTE: To ensure the efficiency of the filters, it is necessary to install the 15x3 mm seal.
(supplied with replacement filters)
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