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Building Technologies Modular Heating Controller RMH760B CE1P3133en
HVAC Products 9 Heating circuit control 05.02.2007
Due to the room temperature deviation ΔTV, the change of flow temperature setpoint
corresponds roughly to the value of:
ΔTFl=ΔTR × V × (sHc + 1)
ΔTFl Change of flow temperature setpoint sHc
Heating curve slope
ΔTR Change of room temperature setpoint Sp Setpoint
V
Room temperature influence
TRx Room temperature
During boost heating, the room temperature setpoint increase also produces an in-
crease of the flow temperature setpoint. In that case, the greatest of the 2 values is
used for generating the setpoint.
3131B22
SpTR
TR
+
-
TR
TR × V
-
TRBoost
MAX TReff
The resulting room temperature setpoint has a minimum limitation of 5 °C and a maxi-
mum limitation of 35 °C.
Only one solar intensity sensor can be connected to a controller. For configuration and
parameterization, refer to chapter
12 “Function block miscellaneous”.
The impact of solar radiation is to be set individually for each heating circuit. It can be
deactivated (setting ”---“).
Main menu > Commissioning > Settings > … or
Main menu > Commissioning > Heating circuit 1 (or 2 or 3) > Optimizations/influences
Operating line Range Factory setting
Impact of solar radiation ---- / 0.0…15.0 K
----
3131B23
TOeff
Isun
SpTFlDe
SpTFlHi
SpTRN
TFl
TOeff
TODe TOHi
sHc
-
+
TFl
sHc
TFl =
Isun × TRsnNom
1000 W/m
2
× (sHc + 1)
ΔTRsnNom
Room temperature increase with 1000 W/m
2
Isun Filtered solar radiation
sHc
Heating curve slope
The solar intensity sensor is to be configured via “Extra configuration”. If required, the
controller’s DC 0…10 V input is to be matched to the sensor output.
DC 0…10 V
≅ 0…1,000 W/m
2
is the factory setting.
Setting of the solar radiation impact must always be matched to the type of building.
The setting to be made is the room temperature increase
ΔTRsnNorm resulting from a
solar radiation of 1,000 W/m
2
.
Based on this parameter and the current (slightly) attenuated solar radiation, the con-
troller calculates the flow temperature readjustment
ΔTFl due to solar radiation (Isun) as
follows:
Isun ×
ΔTRsnNorm
ΔTFl =
1000
× (sHc + 1)
Only one wind speed sensor can be connected to a controller. For configuration and
parameterization, refer to chapter
12 “Function block miscellaneous”.
Rule of thumb
Impact of solar radiation
Settings
Influence of wind speed
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