Composite Outside Temperature - Siemens RVA47.320 User Manual

Benefit
Description
Setting
Process
Effect
Example
Siemens Building Technologies
HVAC Products
4.11

Composite outside temperature

•
Compensating variable for the flow temperature control
The composite outside temperature is a mixture of the actual outside temperature and
the attenuated outside temperature calculated by the controller.
This operating line automatically displays the actual value [°C] of the composite outside
temperature. No direct setting can be made.
Display
-50...50
The mixture of actual and attenuated outside temperature is dependent on the type of
building construction (setting 105) and is generated as follows:
Selected type of construction
Heavy (setting 105 = 0)
Light (setting 105 = 1)
The composite outside temperature as a compensating variable acts on flow
temperature control, that is thus matched to the prevailing weather conditions.
It also acts on the 24-hour heating limit to shut down the heating.
TA
°C
TAgem0
17
16
15
14
13
18:00 06:00
TAakt Actual outside temperature
TAged Attenuated outside temperature
TAgem1 Composite outside temperature for light building structures
TAgem0 Composite outside temperature for heavy building structures
Basic Documentation RVA47.320
Description of the heating engineer settings
Unit
°C
Composite outside temperature
Tagem = ½ TAakt + ½ TAged
Tagem = ¾ TAakt + ¼ TAged
TAakt
TAgem1
TAged
18:00 06:00 18:00
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CE1P2379E
15.07.2002