5
Equipment functioning
16
Betriebsanleitung_firematic_20-301_Touch_Englisch V1.2
The boiler temperature must be under 75°C
before unlocking.
Only after this can the malfunction be rectified. To
do this the covering of the safety temperature
limiter must be unscrewed. Through gentle
pressure using a sharp object the safety
temperature limiter can be unlocked again. After
the cover unscrewed the rectification of the fault
must be carried out via the control box. The safety
temperature limiter is located underneath the
operating terminal.
5.6
Start-up
The first start-up must be carried out by HERZ
factory customer service or an authorised
specialist. (Otherwise the guarantee becomes
invalid.
Besides this the low pressure in the flue pipe
connecting piece of the boiler is measured after
firing with the designated solid fuels at least one
hour during running time and an advance flow
temperature of 70-85°C is achieved.
During start-up and handover to the operator, the
functioning of all control and safety equipment
must also be monitored and the operation and
maintenance of the boiler and equipment must be
explained to the operator in detail.
The hydraulic balancing of the equipment (pipe
installation) must be carried out by an authorised
specialist company (installer).
It is also the duty of the installer (according to
ÖNORM 12170) to create documentation for the
complete system and this must be deposited in
the boiler room.
5.7
Operating temperatures and
impermissible temperatures
5.7.1
Boiler temperature
The HERZ firematic boiler is operated at a boiler
temperature between 65 und 90°C. If the return
flow temperature is below 55°C some of the flue
gases condense on the inside of the boiler. When
the boiler is started up, the operating temperature
(from 65 to 90°C) must therefore be reached as
quickly as possible in order to avoid condensation.
The return flow temperature may also be under
the permissible value at correct boiler operating
temperature. This condition should be avoided by
a functioning increase in return flow temperature
(at least 55°C, or preferably 60°C).
Note:
All guarantee or warranty claims are invalidated in
the event of damage from corrosion arising due to
impermissible operation temperatures.
5.7.2
Return flow temperature
The return flow temperature is always lower than
the boiler temperature.
The return flow temperature must increase to over
55°C (60°C) as quickly as possible, depending
upon the type of boiler. Retention of the
temperature level for the return flow or the boiler
temperature is achieved using a so-called return
flow
bypass
or
return
flow
temperature
maintenance. In this the advance flow water, for
example, is admixed via a pump and the
appropriate valve.
The heat energy of the boiler can only be used
from the time that the return flow temperature has
exceeded 60°C.
5.7.3
Boiler temperatures that are too
high
The HERZ firematic boiler can be operated up to
a maximum boiler temperature of 90°. Higher
temperatures
are
impermissible.
If
the
performance of the boiler is suddenly reduced
(mixers shut off, boiler load pump switches off) it
is sometimes the case that the saved heat energy
in the boiler heats up the heating water above this
value.
In the firematic equipment there are three safety
measures installed in order to prohibit a further
increase in temperature.
