MCZ CLUB COMFORT AIRMATIC 14 M2 Operation And Cleaning page 53

33-ALARMS
If alarm A21 is triggered often, please note that:
A21
Stove door open
Fuel loading hatch open
PRESSURE
SWITCH
Air pressure switch
it is required to check some points to verify the cause of the problem and potentially operate on some adjustments and/or safety devices
to restore correct operation of the product.
However please note that all adjustments and alterations affecting the operational safety devices, must only be performed if THE
PRODUCT IS INSTALLED IN COMPLIANCE WITH THE STANDARDS AND LAWS IN FORCE AND IF IT IS SERVICED PROPERLY BY AUTHORISED AND
SPECIALISED PERSONNEL. Alterations performed randomly, to ensure operation of the product even under non-compliant conditions, can
cause serious damage to property and injuries to people.
Attention!
The adjustments must only be carried out by authorised and qualified personnel under their responsibility and
by checking the conformity of the installation beforehand. The manufacturer declines all liability for damage to
property or injuries to people if the safety devices are altered.
All liability for improper use of the product is entirely borne by the user and relieves the manufacturer from any civil
and criminal liability.
Series of stoves equipped with a pressure switch installed on the hopper with the sampling point positioned on the bottom, to the right of
the gear motor. This system protects the whole system ensuring airtightness of the stove throughout its duration.
It is important to understand that the pressure switch can be triggered with each significant drop in negative pressure and may be due to:
• Flue clogging.
• The presence of a foreign body in the flue (birds, nests, clogged grilles, etc.).
• Wind coming through the flue because it is unprotected or the installation was wall-mounted or required no flue.
• Cold air draught down the flue.
• A damaged pressure switch.
• Blocked membrane inside the pressure switch because soot or pellet dust got in.
• The pellet hopper is open or ajar for more than 60 seconds (60 seconds is the estimated time to reload the hopper).
• Pellets trapped between the hopper cover and the hopper, which prevents the gasket from sealing.
• Broken/worn hopper cover gasket.
• The gasket between the feed screw and the boiler is damaged or positioned incorrectly.
• Fire door is open or the gasket is worn.
• Clogged lateral smoke exchangers.
• Inspection caps with gaskets installed incorrectly after maintenance.
• Feed screw clogged by compressed pellets at the top.
• The installation is compliant and the flue/smoke fitting does not generate obvious obstructions which can stop the release of smoke,
such as: long horizontal sections (over 3 metres), uninsulated smoke ducts, "wall-mounted" smoke exhaust without proper terminals
(installation regulated and permitted in France only [ZONE 3])
• Internal air extraction or recirculation systems (e.g. VMC systems) that generate internal negative pressure exceeding the value
required by law (not exceeding 4 Pa)
• Installed without combustion air ducting, it is crucial to check that there is an efficient air inlet dedicated to the stove, according to
the specifications referred to in chapter 2 of this manual.
The circuit board has also been equipped with an automatic device with a timer and contactors which increase the RPM of the smoke
extractor so as to restore the negative pressure inside the hopper and therefore the pressure switch, if the cover is opened for top-up or if
there is an immediate or occasional pressure drop such as gusts of wind outside. If the pressure drop lasts for more than 60 seconds, the
product goes into alarm status (A05 or A18)
Technical Dept. - All rights reserved - Reproduction prohibited
Close the door
Close the hatch.
Lower the fuel level in the hopper.
Draught difficulties or clogged brazier.
Check whether the brazier is clogged by deposits and clean it, if
necessary.
Check and if necessary clean the smoke duct and air inlet.
53