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Technical information
Flue gas temperature under other operating
conditions
Influence of the boiler water temperature on the
flue gas temperature
A change in the boiler water temperature of ±10 K
results in a change of approximately ±6 K in the
flue gas temperature.
Influence of the CO
2
content in the flue gases
A change in the CO
2
content of ±1 % changes the
flue gas temperature by approx. ±8 °C.
Key to regulator designation
No. of regulators
Regulator width (example: 5 units)
3R5/290
Length of the regulators
4.7 Flow mixing loop / minimum limitation
of the boiler return temperature
Hydraulic and control measures must be provided
to ensure that the temperatures do not fall below
the permissible minimum boiler flow and return
temperature under any operating conditions.
4.8 Setting the temperature regulators
-
without
heating regulator:
Set the boiler temperature in accordance with the
outside temperature.
-
with
heating regulator:
The heating regulator automatically sets the
correct boiler temperature. The boiler temperature
varies between the minimum and maximum boiler
temperatures entered.
If a calorifier is connected, the priority circuit
disables the boiler temperature regulator
until the temperature is reached. The boiler
temperature can rise to approx. 85 °C.
4.9 Safety valves
The heating system and hot water supply must each be
protected with one safety valve against impermissibly
high pressures. The discharge capacity of the heating
system safety valve must correspond to the boiler’s
maximum nominal heat output. The valve is installed
in the safety flow. In Germany, only safety valves
with the code letter "H" in the approval mark may
be connected, and they must always be connected
at the boiler safety flow. Water shortage protection
in accordance with EN 12828 Part 2 Section 9 is
mandatory.
4.10 Charging pump (boiler with free-
standing calorifier)
Speed of rotation and output regulation must
correspond to the requirements of the free-standing
calorifier. Setting carried out by the heating installation
engineer.
4.11 Heating pump
Speed of rotation and output regulation must correspond
to the requirements of the system. They are to be set
by the heating installation engineer.