Atmos
Heating Systems
Installation and user manual EN_FMT
21
CHAPTER 5. TEMPERATURE REGULATIONS
5.1. CENTRAL HEATING
The permissible central heating flow temperature can be set
between 40°C and 90°C. The burner is blocked when the set
flow temperature is reached. During the first 60 seconds of a
central heating heat demand, the flow temperature may rise to
3°C above the set point before the regulation locks.
5.1.1. Central heating temperature regulation with on/off
thermostat without outside temperature sensor
Increasing set point
When the room thermostat is closed (heat demand), the set
point (desired central heating flow temperature) rises at a rate
of 2°C per minute until the maximum permissible central
heating flow temperature is reached (21 minutes from
minimum 40°C to 82°C).
Falling set point
When the room thermostat is open (end of heat demand), the
set point (desired central heating flow temperature) falls at a
rate of 4°C per minute to the minimum central heating
temperature (10.5 minutes from 82°C to minimum 40°C).
Burner is on
•
when the room thermostat is closed (heat demand)
•
and when the actual flow temperature is 5°C below
the set point (desired central heating flow
temperature)
•
and after 3 minutes anti-reciprocital time, if
applicable
Burner is off
•
when the room thermostat is open (end of heat
demand)
•
when the actual flow temperature is 3°C above the
set point (blocking)
•
or when the actual flow temperature is 3°C above the
maximum permissible central heating temperature.
During the set central heating post-running time, the pump will
continue to run over the central heating circuit in low load.
5.1.2. Central heating temperature regulation with on/off
thermostat with outside temperature sensor
Set point
The desired central heating flow temperature (set point) is
calculated on the basis of the measured outside temperature
and the [O/S] - [O/d] - [O/b] parameters set in the menu.
In formula form:
Set point of central heating = (20°C – outside
temperature)*[O/S] /10 + [O/d]
Letter
in
menu
Description
Range
default
O/b
Basic temperature
10 –70 °C
20 °C
O/S
Slope
1 – 100
20
O/d
Flow temperature at
outside = 20°C
0 –70 °C
20°C
C
Max. Flowtemp. for
central heating
25 –90 °C
82°C
Heating curve
O/b-value:
The setting of the minimal Heating flow
temperature ( value in °C).
O/S-value :
The setting for the sloop of the curve.
( change of Flow temperature depending on the change of the
outside temperature).
O/d-value :
The setting of the flow temperature at an outside
temperature of 20°C ( value in °C).
Parameter „C“
The setting in the menu „C“ makes the maximal heating flow
temperature ( default 82°C).
Burner is on
•
when the room thermostat is closed (heat demand)
•
and when the actual flow temperature is 5°C below
the set point (desired central heating flow
temperature)
•
and after 3 minutes anti-reciprocital time, if
applicable, after a reciprocital stop
Burner is off
•
when the room thermostat is open (end of heat
demand)
•
when the actual flow temperature is 3°C above the
set point (blocking)
•
or when the actual flow temperature is 3°C above the
maximum permissible central heating temperature.
During the set central heating post-running time, the pump will
continue to run over the central heating circuit in low load.
Outside temperature in
°
C
O/S=20 [default]
Parameter C=82°C [default]
Outside temperature [°C]
Supply t
empera
ture
[
°C]
O/d=20°C [default]
O/b=20°C [default]
