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2.4 Settings and Adjustments
Heating curves
Function
In order to ensure that sufficient heat energy
is provided with the minimum consumption
of fuel for all outdoor temperatures, the
correct heating curve must be entered to
suit the particular characteristics of the
building and the heating system.
The heating curves determine the
relationship between outdoor temperature
and boiler water temperature or supply
temperature. Basically, the lower the
outdoor temperature, the higher the boiler
water temperature (supply temperature).
There are various heating curves:
Flat heating curves set lower boiler water
temperatures (=supply temperatures), steep
heating curves higher boiler water
temperatures (=supply temperatures).
In turn, the room temperature is dependent
on the boiler water temperature (=supply
temperature).
Setting the heating curve
Adjustable heating curves
Heating curve (factory setting)
Factory settings:
- slope
= 1.4
- parallel shift = 0
The heating curves shown are based on the
following settings:
- parallel shift = 0
- selector knob
“
”
= 5 68
ºF
/ 20
º
C
With a different parallel shift setting, the
curves are adjusted in parallel along the
boiler water temperature axis, i.e. the boiler
water supply temperature is raised or
lowered by a particular value for all outdoor
temperatures.
With a different setting for
“
”
the curves
are adjusted along the desired room
temperature axis.
The heating curve slope normally lies within
the following ranges, for example:
Heating system
Range
Low temperature
heating systems
(see diagram)
A
Systems with tem-
peratures
over 167
ºF
/ 75
º
C
(see diagram)
B
Normal setting:
Well insulated house in protected position
(i.e. radiator heating)
Slope = 1.2
Exposed position or old heating system
(i.e. radiator heating)
Slope = 1.6
Important:
Heating curve settings or adjustments
should be carried out by qualified service
personnel only.
