Operating conditions
7
13
6.6
Operating and impermissible
temperatures
Boiler temperature
The HERZ BioFire boiler operates at a boiler
temperature between 65 °C up to 90 °C. If the
back flow temperature is lower than 55 °C, flue
gas will condense on the inside of the boiler. So, if
the boiler starts up, the operating temperature
(from 65 to 90 °C) must be reached as quickly as
possible in order to avoid condensation. The back
flow temperature may also be lower than the
permissible value at correct boiler operating
temperature. This condition should be avoided by
a back flow temperature increase.
Note!
All guarantee or warranty claims are invalidated in
the event of damage by corrosion arising due to
impermissible operation temperatures.
Back flow temperature
The back flow temperature is always lower than
the boiler temperature. The back flow temperature
must exceed 60 °C as quickly as possible,
depending on the boiler type. Temperature level
retention of the back flow or the boiler
temperature is achieved using a so-called back
flow bypass or back flow temperature monitoring.
In this case the flow is admixed via a pump and a
valve to the back flow.
The boiler´s heat energy can only be used after
the back flow temperature has exceeded 60 °C.
Too high boiler temperatures
The HERZ BioFire boiler can be operated with a
maximum boiler temperature up to 90 °C. If the
decrease of performance drops suddenly (mixers
shut-off, hot water tank load pump switches off)
the boiler´s saved heat energy can overheat the
boiler.
The BioFire boiler has three different pre-installed
safety devices to prohibit a further temperature
increase:
◼
Overheat temperature (higher than 92 °C
boiler temperature)
At this temperature the connected consumer
pumps get switched on in order to conduct
overheat (consumer pump connection to the
HERZ controls is required). Therefore, the
consumers will set on their maximum value.
Consumer pump connection to the HERZ
controls is required. If the consumer pumps
aren´t connected to the HERZ controls, a
higher probability of overheating, resulting in
failure, is given.
◼
Thermal valve for security heat exchanger:
The thermal valve must be connected to the
built-in safety heat exchanger, according to
applied standards.
◼
Safety temperature limiter
– STL (over 95°C
boiler temperature)
At this temperature the boiler gets switched off.
The safety temperature limiter locks itself and
the boiler operation. A fault report gets
indicated, the boiler gets switched off.
Flue gas temperature
The flue gas temperature depends on the boiler
operation conditions, the fuel, the ventilator setting
and the boiler type.
Observe:
The chimney must be insensitive to moisture and
calculated and dimensioned according to DIN
18160 or EN 13384. HERZ does not carry out
chimney calculations. The chimney calculation
must be calculated by authorised personnel. A
miscalculated or undimensioned chimney may
lead to a malfunction of the system.
7
OPERATING
CONDITIONS
Heating off
During this phase the boiler is switched off, i.e. the
burner is blocked.
Ready
The boiler- respectively the buffer temperature is
sufficiently high to provide the required heat load,
or the boiler temperature has reached the switch
off temperature.
Ignition preparation
During this phase the grate gets cleaned and the
lambda probe gets pre-heated.
Pre-aeration
During the pre-aeration phase the burning
chamber and the chimney get purged with fresh
air.
Cold start
If the boiler room temperature is lower than the
identified boiler room ignition temperature (150
°C), the boiler performs a cold start and fuel is fed
to the burning chamber. Materials are pushed in
at intervals. At the same time the fuel gets ignited
by the ignition fan. An ignition monitoring is
conducted during this phase. Successful ignition
is detected when there is a steady increase in the
combustion chamber or exhaust gas temperature
or at the latest when the combustion chamber
ignition temperature is reached.
Summary of Contents for BioFire 1000
Page 1: ...OPERATING INSTRUCTIONS Wood chips pellets heating system BioFire 500 600 800 1000 1250 1500 ...
Page 89: ...Annex 14 89 14 ANNEX 14 1 Additional boiler module Hydraulic recommendation 1 ...
Page 90: ...14 Annex 90 Hydraulic recommendation 2 ...
Page 91: ...Annex 14 91 14 2 Solar module Program 1 ...
Page 92: ...14 Annex 92 Program 2 ...
Page 93: ...Annex 14 93 Program 3 ...
Page 94: ...14 Annex 94 Program 4 ...
Page 95: ...Annex 14 95 Program 5 ...
Page 96: ...14 Annex 96 Program 6 ...
Page 97: ...Notes 15 97 15 NOTES ...