Herz pelletstar CONDENSATION 10, Operating Instructions Manual

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6 Mode of operation
14
Expansion cracks at insulating plates, respectively
burning chamber stones, don´t affect their
capacities and don´t represent warranty claim.
6.6 Commissioning
The commissioning must be carried out by HERZ
factory customer service or an authorised
specialist.
A pressure measurement is conducted
additionally after boiler has been operated with
the actual fuel for minimum 1 hour.
The result of the pressure measurement
represents a characterisation of the draught
during normal operation and shows, if the required
draught has been reached. If a deviation occurs,
the existing chimney has not been dimensioned
correctly or dimensioning underlying installations
have not been carried out correctly (e.g.: faulty
connections, false air inflow, too long connection
pipe,...). Then the chimney system must be
checked by a specialist.
During initial operation and commissioning the
system controls and safety devices must be
checked and the handling of the boiler as well as
the system maintenance schedule must be
explained to the operator.
The hydraulic balancing of the equipment (pipe
installation) must be carried out by an authorised
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 pelletstar boiler operates at a boiler
temperature between 25 °C up 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 pelletstar 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 pelletstar boiler has two or 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.
◼
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.
◼
Thermal valve for security heat exchanger
(depending on the type)
The thermal valve must be connected to the
built-in safety heat exchanger, according to
applied standards.
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 under dimensioned chimney may
lead to a malfunction of the system.