Bedienungsanleitung MCZ MUSA COMFORT AIR 12 M2 (Seite 53 von 72) (Englisch)

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32-ALARMS

If alarm A21 is triggered often, please note that:

A21

PRESSURE

SWITCH

Stove door open Close the door

Fuel loading hatch open Close the hatch.

Lower the fuel level in the hopper.

Air pressure switch Draught diculties 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.

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 aecting 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 qualied 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 signicant drop in negative pressure and may be due to:

• Flue clogging.

• The presence of a foreign body in the ue (birds, nests, clogged grilles, etc.).

• Wind coming through the ue because it is unprotected or the installation was wall-mounted or required no ue.

• Cold air draught down the ue.

• 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 ue/smoke tting 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 ecient air inlet dedicated to the stove, according to

the specications 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)

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MCZ MUSA COMFORT AIR 12 M2 Seite 53

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