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Building Technologies
Modular Heating Controller RMH760B
CE1P3133en
HVAC Products
9 Heating circuit control
05.02.2007
The influence of the wind speed is to be set individually for each heating circuit. It can
be deactivated (setting ”---“).
Main menu > Commissioning > Settings > …
or
Main menu > Settings > Heating circuit 1
(or
2
or
3
)
> Optimizations/influences
Operating line
Range
Factory setting
Influence of wind speed
---- (none) / 0.0…10.0 K ----
The setting to be made is the room temperature drop resulting from a wind speed of
20 m/s. The influence refers to the design temperature at curvepoint
c
.
31
31
B
24
TOeff
Vwd
SpTFlDe
SpTFlHi
SpTRN
TFl
TOeff
TODe
TOHi
sHc
-
+
TFl
sHc
-
+
TO
SpTR
TFl =
× (sHc + 1)
Vwd - 0.8
20 - 0.8
SpTR - TO
20 - TODE
× TRwdNom
×
SpTR - TO
Δ
TRwdNom Room temperature drop at 20 °C
sHc
Heating curve slope
SpTR
Room temperature setpoint
TODE
Outside temperature at the design temperature
TOeff
Effective outside temperature
Vwd
Filtered wind speed
The wind speed 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…20 m/s is the factory setting.
Setting of the wind influence must always be matched to the location of the building.
The setting to be made is the room temperature drop
Δ
TrwdNorm resulting from a wind
speed of 20 m/s at a room temperature of 20 °C and the design temperature A, which
corresponds to the lower curvepoint.
Based on this parameter and the current (slightly) attenuated wind speed, the controller
calculates the flow temperature readjustment
Δ
TFl due to the wind.
Vwd – 0.8
SpTR – TO
Δ
TFl =
19.2
×
20 – TODE
×
Δ
TRwdNorm × (sHc + 1)
9.5.4
Heating limit switch
The heating limit switch is capable of deactivating the heating circuit pump and of
shutting down the supply of heat to the heating circuit.
This prevents the waste of heating energy at higher outside temperatures.
To determine the heating limit, the following outside temperature values are taken into
consideration (refer to subsection 9.5.1 “The composite and the attenuated outside
temperature”):
•
The actual outside temperature TO
•
The composite (effectively used) outside temperature TOeff
•
The attenuated outside temperature TostrDmp
Main menu > Commissioning > Settings > …
or
Main menu > Settings > Heating circuit 1
(or
2
or
3
)
> Space heating
Operating line
Range
Factory setting
Comfort heating limit
---- / –5…25 °C
17 °C
Economy heating limit
---- / –5…25 °C
5 °C
Heat limit with Comfort preset
Inactive / Active
Inactive
The following applies:
Settings
Settings