WDE
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© STULZ SpA . – all rights reserved EN/36B/08.2018
To pull it out, proceed as follows:
• Open the middle front panel. The air filter is below the free cooling damper block, behind a
securing plate screwed to the air conditioner frame and covered with thermal insulating material.
• Loosen the screws of this securing plate and remove it.
• Extract the air filter.
ATTENTION
Spare filters must have filtering medium with the same thickness and density as the original one.
A set of spare filters can be ordered to your local STULZ service partner.
Air filter extraction
8.4. Refrigerant circuit
High pressure switch
High pressure switch is a safety device, therefore its correct intervention must be verified regularly.
To do this, simulate a pressure increase. If the high pressure switch intervenes at a higher pressure
than 32.4 bar (original intervention value +10%), it must be immediately replaced with a new switch
with the same intervention point.
Refrigerant charge
An insufficient charge causes the formation of bubbles in the sight glass or in extreme cases
the stop of compressor due to protection against low pressure. An operation with an insufficient
refrigerant quantity over a longer period leads to a reduction of cooling capacity and to high
superheating temperatures, which have a disadvantageous effect on the compressor lifetime.
ATTENTION
When refrigerant charge is more than 3kg, control of refrigerant leakages is obligatory,
according to European Regulation 517/2014 (F-gas). Certified personnel and companies
(according to Reg. 303/2008) provides regular leak testing (according to Reg. 1516/2007
and Reg. 1497/2007) and maintain records of maintenance activities in a dedicated log book.
