48
MYDENS
COSMOGAS
7 - USE
7.8 - Central heating
Using parameter
2001
, which can be modified by
accessing the “installer profile” (section 7.16) it is possible
to select different operating modes for the central heating
service:
-
2001
=
00
; “Constant temperature with RT (Constant
setpoint adjustment)”: the central heating supply
temperature is adjusted manually via the keys
o
. The opening and closing of the room thermostat
stops or starts the appliance pump correspondingly in order
to adjust the room temperature;
-
2001
=
01
; “Outdoor reset with RT”: appears on
the display the icon
, the supply temperature to
the central heating is adjusted automatically by the
outdoor temperature sensor according to the algorithm
corresponding to Figure 53. The opening and closing of
the room thermostat stops or starts the appliance pump
correspondingly. When the outdoor temperature rises
above the value set under parameter
2025
(Heating stop
spring temperature), the central heating service ends. It
restarts automatically when theoutdoor temperature drops
below the temperature set under parameter
2025
again.
Small corrections can be made to the supply temperature
via parameter
2109
, as shown in Figure 53.
-
2001
=
02
; “Outdoor reset with RT influence”: appears
on the display the icon
, the supply temperature
to the central heating is adjusted automatically by the
outdoor temperature sensor according to the algorithm
corresponding to Figure 53. The opening of the room
thermostat reduces the temperature of the supply to the
central heating by a value set under parameter
2028
.
The appliance pump operates constantly. When the outdoor
temperature rises above the value set under parameter
2025
(heating stop spring temperature), the central
heating service ends. It re-starts automatically when the
outdoor temperature drops below the temperature set under
parameter
2025
again. Small corrections can be made to
the supply temperature via parameter
2109
, as shown in
Figure 53.
-
2001
=
03
; “Constant setpoint with RT influence”: the
central heating supply temperature is adjusted manually via
the keys.
o
.
The opening of the room thermostat reduces the
temperature of the supply to the central heating by a value
set under parameter
2028
.
-
2001
=
04
; “Control from input 0-10 VDC with TA”:
The heating supply temperature is adjusted by means of
the 0-10 VDC signal as shown in Figure 21. The opening
or closing of the room thermostat has priority over the 0-10
VDC signal adjustment.
7.9 - Constant setpoint adjustment
The appliance is factory set with parameter
2001
at
00
,
i.e. the appliance supplies hot water to the central heating
systemat a temperature adjusted using the keys
o
. Any room thermostat operates directly on the pump
inside the appliance to adjust the heating of the rooms.
To make full use of the appliance efficiency is
recommended to adjust the temperature to a value that
is just sufficient to obtain the desired temperature in 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 systems:
- Small systems, with radiators and where there is one
room whose temperature is characteristic of all other
rooms;
- Large systems, with radiators, where each area is
controlled by its own room thermostat and the appliance
pump is stopped only when all area thermostats are
satisfied (appropriate electrical system set-up required).
- Large systems, with radiant panels (low temperature),
where each area is controlled by its own room thermostat
and the appliance pump is stopped only when all area
thermostats are satisfied (appropriate electrical system set-
up required).
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