Herz pelletfire 20/20, Operating Instructions Manual, Page: 15 / 100

Operating conditions 7
15
6.3 Re-heating
Depending on the wood type and quality the
burning time of a filled boiler by nominal capacity
is about three to eight hours.
By intermediate opening of the
front door or the filling room door
the
combustion is disturbed.
These can lead to a poorer
combustion
behaviour and
excessive escape of flue gas.
➔
Filling should burn down
completely
To refill fuel or to check the fill level:
◼
Open the casing door
– the ID-
fan going at full speed, so that
the flue gas is sucked out via
the smoke flue channel by
opening the filling door (2)
◼
Slowly open the filling door (2)
◼
Put in the fuel
◼
Close the filling door and
casing door
◼
A quick covering of the glow
with wood logs reduces the
leakage of hot gases from the
filling room. Refill only as
much fuel as for the energy
absorption capacity of the
system is permitted.
◼
The lower buffer temperature
should be mind. If the buffer is
already loaded (lower buffer
temperature
over 40°C),
please avoid a reloading of
fuel.
By too slight heat
consumption the risk of tar
formation and overheating of
the boiler is existed.
The HERZ-firestar special boiler is characterising
by long combustion duration. It does not have to
be re-filled with fuel at frequent intervals. It is
recommended
that the filling shaft only be filled
according to the heating requirement, so that
frequent opening of the filling door does not have
a negative effect on combustion.
7 OPERATING
CONDITIONS
7.1 Boiler operation with log
wood
HEATING OFF
During this phase the boiler is switched off, i.e. the
burner is blocked.
Scorch phase
In the BURNING PHASE condition wait to see if
the logs catch fire in the combustion chamber.
During 30 minutes an adequate flue temperature
(
HEATING UP FROM MIN ) is adjusted so that it
can be switched on into the HIGH RUNNING
PHASE condition. If this flue gas temperature is
not set, it switches into the HEATING OFF
condition and a corresponding fault is declared.
In this condition it is possible to switch manually
into the UNIT OFF condition.
Start up phase
In the RUN UP PHASE condition, after lightings
the logs, it tries to stabilise the combustion and
achieve the minimum boiler temperature. The
optional combustion control (lambda control) is
already activated at this time. When reaching 65
°C the boiler temperature (set out in the program)
it is switched to the control phase. If the flue gas
temperature decreases in this phase (below
FLUE
GAS MIN TEMP. ), it switches into the RESTART.
Control phase
The CONTROL PHASE condition carries out
actual boiler control, which splits into an output
and combustion control (OPTIONAL). If the boiler
temperature increases in this phase above the
maximum boiler temperature (
BOILER MAX ), it
switches into the READY condition. If the flue gas
temperature decreases in this phase below the
allowed (
FLUE GAS MIN TEMP. ) it switches into
the RESTART condition.
Ready
The maximal boiler temperature ( BOILER MAX
(P02) ) has been reached due to too low heat
capturing. Therefore, the boiler has been switched
off. The boiler starts up again if the boiler
temperature falls 3°C below
BOILER MAX .
Restart
The NEW START-UP condition tries to re-
stabilise the combustion within a time limit
(adjustable via MAXIMUM RE-START). It will
always be activated if the flue gas temperature is
too low. If there is a stable combustion again, it