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Siemens Building Technologies
Basic Documentation QAA73.110 Room unit
CE1P2284en
HVAC Products
Description
of the heating engineer settings
10.07.2002
4
Description of the heating engineer
settings
Service values
4.1 Current room temperature setpoints
Depending on the operating mode, the room temperature is maintained either at the
nominal setpoint (TRN), the reduced setpoint (TRRw), or the frost protection setpoint
(TRF).
These parameters show the current setpoints of heating circuits 1 and 2.
Press the line selection buttons to select line
51
(HC1) or
52
(HC2).
Line
Display
Unit
Setpoint
51
4 ... 35.0
°C
HK1
52
4 ... 35.0
°C
HK2
4.2 Attenuated
outside
temperature
The attenuated outside temperature is the simulated room temperature of a fictive
building that has no internal heat source. This means that it is only the outside
temperature that affects the room temperature. Consideration is given to the building’s
thermal storage capacity.
The attenuated outside temperature is generated by the room unit. It is continually
calculated based on the prevailing outside temperature.
Operating line
53
automatically displays the actual value [°C] of the attenuated outside
temperature. No direct setting can be made.
The generation of the attenuated outside temperature cannot be influenced.
Display
Unit
–50 ... +50
°C
It is possible, however, to reset the attenuated outside temperature:
1. Press the line selection buttons to select line 53.
2. Press the + / – buttons for 3 seconds.
As soon as the display stops flashing, the attenuated outside temperature is reset
to the actual outside temperature.
The attenuated outside temperature affects directly only summer / winter changeover.
The attenuated outside temperature acts indirectly on flow temperature control via the
composite outside temperature.
Description
Line 51, 52
Description
Line 53
Resetting
Effect
