Herz firematic CONDENSATION 30 Operating Instructions Manual Download

Page: 13 / 92

Scorch phase

During the scorch phase the boiler control tries to
achieve an even fire bed. The length of the scorch
phase can be set in the fuel value settings (only
available in the service area). Pay attention to the
higher oxygen content at the combustion. During
the scorch phase the boiler control tries to achieve
an even fire bed.

Start up phase

During  the  start  up  phase  the  boiler  operates  at
nominal  heat  output.  If  the  boiler  set  temperature
is  reached,  the  boiler  will  switch  to  the  regulation
phase.

Regulation phase

During  the  regulation  phase  the  boiler  is
modulated between nominal load and partial load.
If  boiler  oversupplies  heat,  i.e.  if  the  boiler  target
temperature  +  control  hysteresis  gets  exceeded,
the  boiler  will  switch  to  the  operating  condition
„ready”.

Burn out phase

If  the  boiler  will  be  switched  off  the  remaining
quantity  of  residual  fuel  will  burn  independently.
Pay  attention to the  burn out phase time setup, if
chosen  too  short,  fuel  will  not  be  burned
accordingly.

Burner cleaning

During  the  burner  cleaning  phase  ash  gets
removed  off  the  grate.  The  boiler  switches  to  the
burn  out  phase  and  remaining  fuel  gets  burned
out.
Afterwards the grate gets cleaned and the boiler s
witches to normal operation.  Afterwards  the  grate
gets  cleaned  and  the  boiler  switches  to  normal
operation.  The  burner  cleaning  interval  is
calculated  by  the  feeding  screw  operating  time.
This  is  set  up  with  the  parameter

“ash discharge

interval” in the service area. So if the grate should
cleaning frequently you have to reduce the
parameter.

Heat exchanger cleaning

The Heat exchanger gets cleaned automatically.
The cleaning interval and duration is set up in the
service ar

ea with the parameter “heat exchanger

cleaning interval“ respectively „heat exchanger
cleaning duration“.

Boiler output control

The  output  control  is  controlled  within  the  boiler
target  temperature  and  the  control  end  phase.
The  control  end  phase  is  the  boiler  target
temperature  +  control  hysteresis.  If  the  regulation
end  is  reached,  the  boiler  will  switch  to  the  burn
out phase.

Flue gas temperature control

If the maximum flue gas temperature is exceeded,
the boiler output will be reduced. If the actual flue
gas temperature is lower than the maximum flue
gas temperature, the boiler will switch to normal
output control.

Flame

monitoring

(burning

chamber

temperature)

If the burning chamber temperature fluctuates
greatly during operation, the boiler will switch off.

Freezing protection

If  the  freezing  protection  operates,  the  back  flow
bypass  pump  will  switch  on  only  if  the  boiler  is  in
operating  mode  “HEATING  OFF”  or  “BURNER
STOP”.  Otherwise  (freezing  protection  disabled)
the  boiler  will  start  up  and  heat  up  to  minimum
boiler temperature.

Lambda control

The amount of material and the rotation speed of
the ID-fan are controlled by the lambda control.
The control is able to detect marginal deviations of
the fuel quality and induces a combustion
improvement.