41
MYDENS 60
COSMOGAS
7 - USE
It re-starts automatically when the external temperature
drops below the temperature set in the parameter
2020
again (forced central heating switch-off).
7.10 - Thermostatic adjustment
In the factory the boiler is adjusted with the parameter
2003
to
00
, i.e. the boiler supplies hot water to the central heating
plant at a temperature adjusted using the
or
keys. Any room thermostat operates directly on the pump
inside the boiler to adjust the heating of the rooms.
To make full use of boiler efficiency, it is recommended to
adjust the temperature to a value just sufficient to obtain
the temperature desired by the rooms. If the season gets
colder, progressively increase the value of the central heating
temperature. Proceed in reverse order when the season goes
towards warmer temperatures. This very simple operating
method is suitable for the following types of plants:
- small plants, with radiators, having a room whose temperature
is characteristic of all other rooms;
- large plants, with radiators, where each area is controlled
by its own room thermostat and the boiler pump is stopped
only when all area thermostats are satisfied (envision the
appropriate electric plant).
- large plants, with radiant panels (low temperature), where
each area is controlled by its own room thermostat and the
boiler pump is stopped only when all area thermostats are
satisfied (envision the appropriate electric plant).
7.11 - Climatic adjustment
Using the “Installer menu” adjust the parameter
2003
to
01
. The central heating flow temperature is reported to the
external temperature sensor according to the algorithm in
figure 7.2. To adapt the calculation line to the various hones/
climatic conditions, all adjustment parameters must be set
according to the following chapters.
7.11.1 - Climatic adjustment: on which
plants?
The “Climatic adjustment” is a more sophisticated and precise
adjustment than the “Thermostatic adjustment”. This can
make the most use of the boiler efficiency and is suitable for
the following types of plant:
- small plants, with radiators, having a room whose temperature
is characteristic of all other rooms.
The room thermostat makes the appropriate corrections to the
room temperature by switching the boiler pump on and off.
- large plants, with radiators, where each area is controlled
by its own room thermostat and the boiler pump is stopped
only when all area thermostats are satisfied (envision the
appropriate electric plant).
- small plants, with radiant panels (low temperature), having a
room whose temperature is characteristic of all other rooms.
The room thermostat makes the appropriate corrections
to the room temperature by switching the boiler pump on
and off.
- large plants, with radiant panels (low temperature), where
each area is controlled by its own room thermostat and the
boiler pump is stopped only when all area thermostats are
satisfied (envision the appropriate electric plant).
7.11.2 - Climatic adjustment: precautions
during adjustment
To set the flow temperature correctly, it is good practice to
immediately set the line setting values in figure 7.2. If these
values do not give a satisfactory result, proceed with the
relevant modifications, keeping in mind that:
- every parameter must be adjusted in small degrees;
- after each change, wait at least 24 hours to see the result;
- the more the adjustment line approaches the real
requirements of the building, the more building central
heating will be comfortable and the greater the energy
saving will be;
- using the
or
key, it is possible to make the
small corrections highlighted in figure 7.2, i.e. move the
parallelism of the line, in steps of 1 °C more or less, up
to 10°C.
7.11.3 - Climatic adjustment: setting the
parameters
Using the “Installer menu” (see chapter 7.18), set:
-
2020
= “External switch-off temperature of the central
heating”, adjustable between 0 and 35°C. When the
external temperature reaches the value set in this
parameter, the central heating is switched-off automatically.
The central heating switches back on automatically when
the external temperature drops back below this value. The
recommended start value is 22°C.
-
2021
= “Design external temperature (winter)”, adjustable
between -20 and 5°C. It is the design external temperature
used to define the heat output necessary at the plant. The
value recommended for a typical home is -5°C;
-
2022
= “Flow temperature corresponding to the design
external temperature (winter)”, adjustable between 0 and
80°C. The flow temperature assumes the value set in this
parameter when the external temperature corresponds to
that set in the parameter
2021
. The recommended start
values are: 40°C for low temperature plants (floor heating);
67°C for high temperature plants (radiators);
-
2023
= “External spring-like temperature”, adjustable
between 0 and 30°C. It is the external temperature at
which the central heating is to reach the minimum flow
temperature. The recommended start value is 18°C;
-
2024
= “Flow temperature corresponding to the external
spring-like temperature”, adjustable between 0 and 40°C.
The flow temperature assumes the values et, it corresponds
to that set in the parameter
2023
. The recommended
start values are: 30°C for low temperature plants (floor
heating); 42°C for high temperature plants (radiators);
- It is always possible to set the minimum and maximum central
heating temperatures using the respective parameters
3016
and
3015
present in chapter 11.
