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Control Technology
Outdoor Reset Programming Unit
Heating curve adjustment
ºF / ºC
194
90
176
80
158
70
140
60
50
122
40
104
ºF
ºC
30
86
95
35 86
30
77
25
68
Room -
20
60
set-point
15
temperature
Low-temperature heating system,
e.g. radiant floor heating
Medium-temperature heating
system, e.g. cast iron radiation,
staple-up radiant floor heating
High-temperature heating system,
e.g. fintube radiation, fan coils
30
10
5
0
-5
-10 -15 -20
50 41 32 23
14
Outdoor temperature
50
10
41
5
(continued)
1,4
C
1,2
1,0
B
0,8
0,6
A
0,4
0,2
-25
-30
ºC
5
-4 -13 -22
ºF
The heating curves represent the
relationship between the outdoor
temperature and the boiler water or
supply temperature.
Put simply: The lower the outdoor
temperature, the higher the boiler
water or supply temperature.
In turn, the room temperature is
dependent on the boiler water or
supply temperature.
If a different room temperature is set,
the curves are shifted parallel to the
desired room temperature axis.
The control unit regulates the boiler
water temperature (= supply
temperature of heating circuit without
mixing valve) and the supply
temperature of the heating circuit with
mixing valve (in conjunction with the
accessory kit for a heating circuit with
mixing valve) according to the outdoor
temperature. The boiler water
temperature is automatically raised by
0 to 72º F / 0 to 40 K higher than the
currently required set supply
termperature (in the factory default
setting the differential temperature is
14.4º F / 8 K). See coding address
"9F" in coding level 2.
The supply temperature that is required
to achieve a given room temperature
depends on the heating system and the
thermal insulation of the building that is
being heated.
The adjustment of the two heating
curves is used to match the boiler
water temperature and the supply
temperature to these conditions.The
boiler water temperature is limited
upwards by the fixed high limit and the
temperature set for the electronic high
limit.
The supply temperature cannot rise
above the boiler water temperature.
Factory settings:
H slope "n" = 1.4
H shift
"N" = 0
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