Herz BioFire 1000 Operating Instructions Manual Download

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Safety devices

SAFETY DEVICES

The safety devices must be dimensioned and installed according to ÖNORM EN 12828.

The safety valve in the boiler circulation serves as a final safety device against malfunctions of the
equipment.

All legal safety regulations must be adhered to on-site via the authorised specialist company.

Earthing or potential equalisation must be carried out on the whole heating system according to EN 60204-1
by an authorised specialist company.

1 Safety temperature limiter

If  the  boiler  temperature  exceeds  95  °C,  the
equipment  must  be  switched  off  for  safety
reasons. The safety temperature limiter (STL) will
lock in this case.

Possible causes may be:

◼

Performance decrease in the boiler was
interrupted abruptly. This can occur due to
the switching off a pump or sudden shutting
of the heating circuit mixer.

◼

The load pumps are being controlled by the
HERZ Control. The so-called excess
temperature

flue

gas

would

automatically activated by the HERZ
Control.

This

avoids

higher

boiler

temperatures.

◼

The boiler is too large.

◼

The fuel level is set too high.

◼

Loss of power supply

◼

Etc.

At First the cause of the failure must be found and
be corrected, afterwards the safety temperature
limiter can be unlocked.

The boiler temperature must be lower than 75

°C before unlocking.

Only then the problem can be acknowledged. For
this purpose, the cover of the STL is screwed off.
The STL can be unlocked by a light pressure with
a  sharp  object.  After  unscrewing  the  cover  the
fault  acknowledgement  must  be  performed  at  the
switch  box.  The  location  of  the  STL  is  on  the  left
side next of the display.

2 and 3 automated extinguishing devices

The Boiler features an automated extinguishing
device. The device consists of a thermal safety

valve, a thermostat valve (3) and a water tank (2).
If the feeding screw temperature gets exceeded,
the valve opens independently and flushes the
feeding pipe. This extinguishing device is used as
a safety device at burn back.

4 Burn-back safety unit

The  burn-back  safety  unit  prevents  a  burn-back
into  the  fuel  storage  room.  It  separates
additionally  the  combustion  chamber  and  the  fuel
storage  room.  The  burn-back  safety  unit  is
conducted like a fire flap. It opens only  when fuel
is fed to the boiler.

5 Safety valves

The safety valve automatically releases, when the
pressure or temperature exceeds preset limits.
The safety valve has to release at the maximum
allowable pressure (according to boiler plate).

6 Safety heat exchangers

The  safety  heat  exchanger  is  a  built  in  safety
device  and  has  to  be  connected  to  a  thermal
release  valve  and  installed,  according  to  applied
standards.  The  safety  heat  exchanger  has  to  be
connected  directly  to  a  cold  water  pipe  (pressure
≤  3 bar)

7 Ash container and burning chamber
safety device

The ash containers are connected contact-free
(inductive sensor) to the boiler.

Fuel storage room temperature monitoring

The  fuel  storage  room  temperature  monitoring  is
placed  directly  above  the  transport  screw.  There
is placed a temperature sensor which is setting to
the  release  temperature.  If  the  storage  room
temperature exceeds its preset limit, the boiler will
switch  to  the  operate  condition  „HEATING  OFF“
and  displays  a  fault  report.  Additionally,  a  fault
sensor  output  gets  active.  Conduct  alerting  in
accordance with national standards.