Heating Circuit Room Factor - Honeywell SDC Service Manual

SDC / DHC
Application
See also
7.3.4.2
Function
EN2H-0221GE51 R0812
At this setting the room sensor is only used as a display device
without influencing the room temperature-related functions. The
operation of the wall device is possible without restrictions.
All system layouts that exclude room influence while the display of
the actual room temperature is still required (in contrast to setting
OFF).
5.4.4 "Direct heating circuit" menu (UNMIXED CIRC), Pg. 92

Heating circuit room factor

This function determines to what extent a deviation of the room
temperature from the setpoint affects the control of boiler flow
temperature.
If there is no difference between the desired (TARGET) and the
current (ACTUAL) room temperature, the direct heating circuit's
flow temperature is controlled according to the set heating curve.
If there is a difference between the room temperature and the
setpoint, the heating curve is shifted parallel to the room
temperature axis so that the deviation is compensated. The
amount of the displacement depends on the setting of the room
factor.
The following relation applies:
Corrected room setpoin t
Example:
set room setpoint = 21°C
actual room temperature = 20°C
Deviation = -1 K
For a room influence of 100%:
Corrected room setpoin
The boiler temperature is controlled according to a heating curve
which corresponds to a room temperature setpoint of 22°C.

Deviation
= −

Set room setpoin t

 −
1
= ° −

t 21 C

Hydraulic Components

x Room factor


100

K x 100
= °

22 C

100
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