Metal-Fach SD DUO BIO Series, Operation And Maintenance Documentation

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31
Question
How long can the boiler operate on full tank?
What is the lowest temperature of the boiler?
What is the minimum return temperature?
How is the boiler protected against freezing?
Answer
There is no simple answer. It can be assumed that the boiler
can operate for 3-4 days.
The higher thetemperature the better but the lowest
o
temperature should not fall below 60 C.
o
The recommended return temperature is 10 C lower than
the feeding temperature
.
Tthe boiler is protected against freezing with the controller
software
.
Explanation
The continuous burn time depends on:
-fuel calorific value
-heating insulation of the building
-kind of installation i.e. floor heating, radiators, boiler
-boiler exchanger cleanliness, amount of ash in the ash tray
-outside temperature
-inside temperature
-combustion quality
The boiler should be adjusted in the way so that when the boiler
o o
temperature is 60 C, the fumes temperature is 140 C. It ensures the best
efficiency of the boiler. At such temperatures, the boiler will not
„sweat”and get wet as there is no fumes gas condensation
In practice, without any mixing valves or other mixing devices
it is impossible. It is recommended to install a four-way valve to make the
boiler operate on short circulation at high temperature and the
installation on any set temperature. The protection of the boiler is still
in place and equals the boiler feeding temperature.
o
At the temperature below 8 C, the controller opens up the mixing valve
and turns on the central heating pump in order to prevent the water in the
installation from freezing. Additionally, all the pipes that are exposed to
heat loss should be extra insulated.Check if all the windows in the vicinity
of the piping are complete and shut and there are no holes in the walls
etc.
T able 18.1 Possible faults and malfunctions
What are the FL 310 LG and FL 600 LG RTC
controllers working modes? The FL 310 LG RTC and FL 600 LG RTC controllers have
three working modes.
Summer- heating up the tap water.
Manual- heating up the tap water and feeding the central heating.
In this mode, set the temperature on the boiler and the heating
circulation.
Weather- heating up the tap water and the central heating. In this mode,
the controller calculates the set temperature for the boiler and heating
circulation.