MCZ Hydrotherm 70 - Manual (Page 40)

INSTALLATION AND USE MANUAL
Chapter 5
page
40
Operation Technical service – MCZ GROUP S.p.A. all rights reserved - Reproduction prohibited
For cooking food on the grille, we advise first forming a bed of coals
without flames and then opening the door only to turn the food on the
grille.
5.5. CONTROL OF COMBUSTION
PRIMARY AIR
The fireplace stove is provided, at the front, with a safety mechanical
valve that adjusts the entrance of primary air depending on the
temperature of the water in the hottest point of the boiler. The valve
stays open until 40 C°; once this threshold is exceeded it gradually
begins to close as the temperature increases, until completely
obstructing the passage of air at approximately 80 C°. This is necessary
to avoid that the water in the boiler overheats and reduce unnecessary
consumption of fuel. (Fig.A)
SECONDARY AIR
The emission of secondary air is predetermined; it is necessary to
partially clean the glass of the firebox door and allows the completion
of the combustion process by lowering the percentage of CO in the
smoke and improving the yield of the product. (Fig. B and B1)
The use of damp or treated wood emits a higher quantity of
smoke than normal that can dirty glass faster. Also the low
performance of the flue pipe can jeopardise glass cleanliness
since smoke remains in the combustion chamber longer than
normal.
5.6. FIRST LIGHTING
It is advisable to approach the first lighting with caution, using
good-quality, well-seasoned wood.
The primary air inlet must be fully open. Do not use alcohol,
petrol, or other volatile flammable substances. On first lighting,
fumes and unpleasant smells may be given off, caused by the drying of
the product; this is not hazardous, and it is sufficient to ventilate the
room. Once combustion has started, pieces of wood of normal size may
be added.
The flame must have as far as possible a smooth and laminar flow. On
the various occasions when the stove needs reloading, the
door should be opened slowly, to avoid blowbacks of smoke
into the room.
Proceed as follows:

Place a small amount of balled paper in the stove.
 Cover the paper with a small quantity of twigs and a few pieces of
wood.
 Light the paper, and if necessary leave the door up.
 When the twigs are burning, the door can be closed.
As the fire burns, add wood. Never overload the fireplace stove
with wood (see technical specifications in the table).
As soon as the flames have died down and a bed of embers has
formed, load the stove normally. Small loads of wood are preferable to
large ones for combustion.
Figura B
80°
40°
Figura A
Figura B1