51
MYDENS
COSMOGAS
7 - USE
7.10.4 - Outdoor reset: adaptation to
different climatic areas
The previously recommended values are for homes with
average insulation and for climatic areas where the outdoor
temperature used for calculating the heat requirement
is -5°C (with these data and a high-temperature system,
there is correspondence with the graph in Figure 53). If
the climatic area is different, adjust parameter
2020
,
“Outdoor winter design temperature”, so as to obtain a
supply temperature of 70°C (40°C in the case of “low-
temperature” systems), when the outdoor temperature
is the one used as the basis for calculating the heat
requirement.
7.10.5 - Outdoor reset: switching the
central heating service on and off
The outdoor reset service is completely automatic, including
switch-off at the end of the season and switch-on at the
start of the next season via parameter
2025
.
When the outdoor temperature rises above the value set
under this parameter, the central heating switches off
automatically.
When the outdoor temperature drops back below the
value set under this parameter, the central heating service
switches back on automatically.
7.10.6 - Outdoor reset with RT influence
Access the “installer profile” (section 7.16), adjust
parameter
2001
to
02
.
Everything operates exactly as in the previous sections
on “Outdoor reset”, the only difference being that now the
appliance pump is always on.
Opening the room thermostat contact translates into a
downward parallel translation of the line (Figure 53) for the
value set under parameter
2028
, which can be set from
the “installer profile” (section 7.16).
Parameter
2028
can assume values between 0°C and
30°C.
The values recommended for this parameter are:
- 10°C for high-temperature systems (radiators);
- 3°C for low-temperature systems (underfloor heating).
Values that are too high can translate into room
temperature instability.
Values that are too low can make the room thermostat
ineffective.
The outdoor reset with room compensation can be used
in all cases specified in section 7.10.1 with the advantage
that the pump’s continues operation stabilises the room
temperatures and makes them uniform, especially where
some of the heat system loops have flow resistances that
are much higher than others.
