Hot Water Boiler Manual – Models H 635, H 650
5
Fig. 2: Selected spare parts for H 635 & H650 boilers
Short fire bar
Refueling, ashtray and
cleaning doors
Long fire bar
Grate bracket
Swivel support of long
fire bars
Firing flap
Swivel support of short
fire bars
Ash tray
Underburning / through-
burning flap
Refractory panel
Firing flap lever
F) Instructions for use
Boiler firing
The boiler shall be fired as an ordinary stove. Place paper to the grate through the top door and cover with
kindling. Add several bigger pieces of wood. Close the secondary air supply using lever located on the side of
the boiler. Moving the lever backwards closes the air supply, while moving the lever forward will open the air
supply.
Move the grate backwards, ignite a piece of paper and put it under the grate through a gap formed after moving
the grate. Move the grate to a neutral position after ignition. Add wood and other fuel as needed until the fuel
level exceeds the lower edge of the underburning partition. Then charge such quantity of fuel which will fill the
charging shaft up to the level ensuring a tight closing of door. The quantity of fuel added shall not cause tipping
of the underburning / through-burning flap.
Lignite shall be burned by underburning, i.e. the underburning / through-burning flap is in the upright position.
Tipping of this flap is carried out by a hook which shall be engaged with an eye welded to the firing flap after
opening the charging door.
In case of a low chimney effect during firing we may open the firing flap. This is performed by moving the weight
backwards. Immediately after thorough ignition of fuel is reached move the flap towards the front section of the
boiler by moving the weight. Keep the flap open for a shortest time possible, since the flue gases do not pass
through the heat-exchanging segmented surface, but directly to the chimney when the flap is open and this
causes heat losses and uneconomical operation.
