Herz pelletfire 20/20, Operating Instructions Manual

Page: 9 / 100

Handling of the heating system 4
9
4 HANDLING OF THE
HEATING SYSTEM
4.1 Sealing the boiler
It is imperative that all doors are closed during
operation so that no leak air can disrupt the
combustion process. If this is not observed then
damage to the boiler may result.
4.2 Operation with low
performance decrease
Should fuel be burned in the transition period
(spring or autumn) it is vital to ensure that for low
decreased performance (less than 50%) the filling
shaft is not completely put on. Decreased
performance of less than 50 % means the boiler
and the chimney may become clogged with soot.
It is also possible that smoke may develop in the
chimney. The pelletfire boiler should there for
basically be operated equipped with a
correctly dimensioned buffer
(according to EN
303-5). Recommended dimensions are listed in
the document “installation instructions".
4.3 Overheating of the boiler-STL
Should the boiler temperature exceed maximum
boiler temperature, the safety temperature limiter
switches the controls off. After the equipment has
cooled off under about 75°C, the Safety
Temperature Limiter (STL) should be tripped by
unscrewing the covering cap (press the button).
Afterwards screw up the covering cap again.
Before re-starting the cause of the overheating
should be identified and corrected.
Thermal valve for security heat exchanger
If the boiler overheats then the “thermal safety
device” opens automatically (at 95°C) via a sensor
and cold water flows through the heat exchanger.
The boiler water is thereby cooled off and
dangerous operating conditions are prevented.
The water heated up in the heat exchanger must
be able to run away freely (directly into the waste
water channel). After the boiler water has cooled
off about 90 °C the "thermal safety device”
automatically interrupts the cold water feed. After
cooling off the equipment pressure and/or water
level of the equipment is to be controlled and if
necessary the missing amount of water topped
up. According to DIN 4751 sheet 2 the operator is
obliged to regulate the functioning of the “thermal
safety device” and the heat exchanger belonging
to it at least once a month by activating the test
button. Furthermore this safety instruction is to be
monitored once a year by the manufacturing
company or another competent organisation.
Attention:
If it is a inoperable combinati
on of the “thermal
safety device” and heat exchanger, the set-up of
the equipment is prohibited!!
4.4 Sweating of the boiler
During long-term operation it should be
guaranteed that the return flow temperature does
not fall below 65 °C. For this reason a return flow
temperature bypass is obligatory.
Attention:
Corrosion damages which are caused by too low
return flow temperatures do not come under the
guarantee or warranty.
4.5 Decommissioning
The main switch sh
ould not be turned “OFF”
during the burn-off only after complete burn-off.
(Status: Heating off)