hergom H-03 Instructions D'installation, De Service Et De Maintenance page 15

PRIMARY AIR. REGULATION
The provision of air for the combustion process is
performed by means of the primary air valve.
(See fig. 4)
To favour lighting-up the fireplace and to avoid
the formation of tar, we recommend opening the
primary air valve completely to allow the inflow
of abundant air for the combustion process.
This situation must be maintained at the
beginning of each lighting-up process in order to
heat the fireplace and chimney, which will avoid
the formation of condensation and creosote.
It is essential to provide an abundant load of fuel
when lighting. The following loads will depend on
the heat requirement desired.
Once the fireplace is hot, you may regulate the
provision of air for the combustion process.
COMMENT: Due to its air-tightness and heat
circulation of the Built-in Fireplace H-03 during
normal situations, we recommend opening the
door of the fireplace slowly when you have to
add more fuel.
SECONDARY AIR. SELF-CLEANING
The purpose of secondary air for the combustion
process is to provide additional air to burn any
un-burnt matter after the primary combustion
process due to a lack of oxygen.
This extends the combustion process and
improve the performance of the device.
The provision of secondary air is through the top
opening in the BUILT-IN FIREPLACE H-03 and is
aimed at the glass pane on the door, creating a
layer of air that will prevent soot from adhering
to the said pane. (Self-cleaning) (See Fig.-3)
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Fig.-3 Details of secondary air provision
Fig.-4 Details of primary air provision
DIRECT DRAW VALVE. (Only in H-03 DB/R
models)
This valve serves to regulate draw in the chimney,
reducing or increasing the flow of gases from the
fireplace and, consequently, it can also be used
for combustion control. We recommend it for
use in chimneys with excessive draw.
Push the rod in to open the valve. As you pull the
rod out, the draw will gradually close.
To open the door, the draw valve should be fully
open.
Closed
Fig.-5