Herz firematic CONDENSATION 30, Руководство по эксплуатации

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7 Operating conditions
12
specialist company (installer). The installer is also
obliged (according to Draft documentation for all
the equipment (according to ÖNORM EN 12170),
which must be kept in the boiler room.
6.7 Operating and impermissible
temperatures
Boiler temperature
The HERZ firematic boiler operates at a boiler
temperature between 25 to 90 °C. The back flow
temperature may also be lower than the
permissible value at correct boiler operating
temperature.
Back flow temperature
The back flow temperature is always lower than
the boiler temperature. The raising of the back
flow temperature can be realized by a working
flow temperature booster.
Too high boiler temperatures
The HERZ firematic 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 firematic 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 heatexchanger
(depending on the type)
The thermal valve must be connected to the
built in safety heat exchanger, according to
applied standards.
◼
Safety temperature limiter
– STL (over 95°C
boilertemperature)
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.
Thereafter, the system changes over to the scorch
phase, where at the same time the final ignition
fan phase is carried out. During the final ignition
fan phase the ventilator of the ignition fans runs
for a minute longer in order to cool down the
heating element.
If ignition wasn´t possible prior the maximum
ignition period, the boiler will switch off and the
fault “IGNITION” will appear in the fault list.