Maga MA 15 Operation And Maintenance Manual - page 4
3. Technical Description
The boiler is designed to work on burning wood. The combustion process (which is based upon power generating
gasification) is obtained by passing ambient air into the firebox (furnace) with the use of an exhaust fan.
The boiler shell is made from steel plates as a welded assembly. It consists of a fuel feed hopper, which at its bottom part is
equipped with a fireproof insulation brick that comprises a longitudinal opening (nozzle) for exhausting the combustion products.
There is an afterburning space with ceramic tile blocks located beneath the said fireproof insulation brick. In the rear part of the
boiler there is a vertical tube plate that, in its upper part, merges into a collecting duct where there is a firing valve. The collecting
duct’s rear part is equipped with an exhaust fan and socket for connecting the duct to the chimney.
The front face of the upper part comprises a refueling door and the lower part comprises an ash door. There is a fan
located on the back side.
The outside surface of the boiler body is thermally insulated with mineral wool inserted beneath sheet metal covers of the
boiler’s outer shell.
The upper portion of the boiler comprises a control panel.
The boiler’s construction gives the following advantages:
- the combustion process takes place at a high temperature using the function of power generating gasification;
- the combustion air is supplied through an exhaust fan;
- the combustion process is characterized with stable flame and a stable state and quality of combustion;
- the large fuel feed hopper enables the burning of separate pieces of wood with maximum length of 500 mm (MA15 – 350mm,
MA 80 up to 650 mm);
- enables the burning of wood waste.
4. Operating Regulations
Boiler Preparation for Operation
Before the boiler is put into operation, it is necessary to ensure that your heating system has been filled with water (that has
to be up to standard STN 07 7401:1992) and deaerated. Ceramic “U” needs to be completed and has to be placed directly under
the nozzle – (see page 8). There is also an electrical box at the back side of the boiler, which has a terminal board for connection
of the water pump(inclouded socket). In the Service parameters setting
(see chapter Service manual for ST-81 zPID control
unit
) you may change the temperature, from which the boiler will starts to operate the water pump. The preset value is 60°C
( arrange 30 - 60°C)
In order to ensure proper and safe operation, your wood-fired boiler must be operated in accordance with the instructions
contained in this operating and maintenance manual. The boiler must be operated by adults only.
CAUTION
When you fire up a new boiler for the first time, condensation and discharge of the condensate from the boiler may occur -
this is not because of any defect in the boiler. After a longer duration of operation the condensation will disappear.
Firing Up and Operation
Before you fire up the boiler, be sure to open the firing valve (11). To do this, pull the firing valve’s draw rod (15) towards
yourself until the draw rod is locked in the "B” position. Insert dry wood chips onto the fireproof insulation brick (5) through the
upper door (2). The wood chips should be inserted perpendicularly to the duct (10) in such a way that a gap of about 2 – 4 cm
(approx. 0.8 to 1.5 inch) should be allowed between the duct and fuel so that the duct intended to convey combustion products
could not get blocked. Put some paper or wood wool on the wood chips and insert some additional wood chips and a larger
amount of dry wood onto it. Open the lower door (3) and start the exhaust fan. (To start the exhaust fan, please turn
ON
the
control unit by the switch to the position
I
and press the
button two times.) Fan(4) will start to work. We can set the
temperature on the control unit to 80-85°C by pressing
or
button. We do not need to press any button to save the
setting. Control unit will saves it automatically up to 5 seconds.
After lighting the fire, shut the upper door (2) and wait until the fuel catches fire. Then add additional fuel (the firebox
should be fully filled with wood). After the fuel catches fire, close the lower door (3), shut the firing valve (15) by pushing the
firing valve’s draw rod to the (A).
Control unit comes with default settings. Aditional settings are explained in chapter Service manual for ST-81 zPID control unit.
If the fuel burns out and water temperature decreases in the boiler, the fan and pump turns off automatically.
Note:
In boilers equipped with flue temperature sensor the fan and pump will go off by decreasing set flue temperature. In the control
unit the flue sensor needs to be set to
ON
.
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