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Building Technologies
Modular Heating Controller RMH760B
CE1P3133en
HVAC Products
9 Heating circuit control
05.02.2007
•
Room temperature
•
Boost heating (refer to subsection 9.7.3 “Quick setback and boost heating”)
The basic heating curve applies to a room temperature setpoint of 20 °C. A positive
room temperature setpoint change
Δ
TR corresponds to a displacement of the heating
curve by the same amount toward the outside temperature and to a displacement by
the same amount toward the flow temperature.
31
31
B
21
TFl
TOeff
+
-
SpTR
20 °C
SpTFlDe
SpTFlHi
SpTRN
TFl
TOeff
TODe
TOHi
+
-
+
+
SpTR
Roughly, this corresponds to the value of:
Δ
TFl =
Δ
TRw × (sHc + 1)
SpTFlDe – SpTFlHi
sHc =
ToHi – ToDe
Setpoint readjustment
Δ
TRw = 2 K.
Δ
TFl = ?
60 – 30
sHc =
(15– [–5 ])
= 1.5
⇒
Δ
TFl = 2 K × (1,5 + 1) = 5 K
A deviation of the actual room temperature from the room temperature setpoint has an
impact on the flow temperature setpoint only when room temperature influence is
activated.
Connection of a room temperature sensor does not automatically activate the room
influence.
An analog sensor can be used as a room temperature sensor (Extra configuration), or a
room unit transmits the room temperature signal via bus.
In plants where the heating circuit operates in connection with a ventilation system as a
room control combination, the room temperature sensor of the ventilation system must
not be located in the extract air!
The set room temperature influence defines the gain factor with which the room tem-
perature deviation shall be weighted. The heating curve handles this amplified room
temperature as a readjusted room temperature setpoint.
Main menu > Commissioning > Settings > …
or
Main menu > Settings > Heating circuit 1
(or
2
or
3
)
> Optimizations/influences
Operating line
Range
Factory setting
Room influence
---- / 0…10
----
31
31
B
20
TOeff
+
-
SpTR
TR
20 °C
SpTFlDe
SpTFlHi
SpTRN
TFl
TOeff
TODe
TOHi
+
-
+
-
+
+
TFl
SpTR
TR × V
-
Impact of the room
temperature setpoint
Example
Impact of the room
temperature
⇒
Settings