Minimum Setpoint Of Flow Temperature Contact H1 - Siemens RVA47.320 User Manual

Benefit
Description
Important
Setting
Effect
Notes
110/166
Siemens Building Technologies
HVAC Products
4.62 Minimum setpoint of flow temperature
contact H1
•
Handling of heat demand signals from units incompatible with LPB
•
Temporary startup of boiler via switching contact
Function for setting the temperature at which the cascade or the boiler is maintained
when contact H1 is closed.
This setting has an effect only if on operating line 170 "Input H1" setting 1 "Minimum
setpoint of flow temperature contact H1" has been selected.
1. Press the operating line selection buttons to select operating line 171.
2. Press the + / – buttons to set the required value of the "Minimum setpoint of flow
temperature contact H1".
Setting range
8...TKmax
...TKmax Maximum limitation of BMU setpoint, operating line 2
Function "Minimum setpoint of flow temperature contact H1" selected on operating line
170 will be activated when contact H1 closes. The heat source or the cascade will
maintain the temperature level set here until either contact H1 reopens or more heat is
demanded.
If several heat demand signals are received at the same time (LPB, contact H1, d.h.w.,
or from the controller itself), the highest of them will automatically be selected.
If the demand for heat is so small that a single BMU running on its basic stage still
produces too much heat, it will start cycling within the switching differential set on it.
Otherwise, the required output will be provided through modulation of the burner.
TK
°C
80
70
60
50
40
30 0
30 20 10
TVHw Minimum setpoint of the flow temperature, contact H1
TKw Boiler temperature setpoint
Basic Documentation RVA47.320
Description of the heating engineer settings
Unit
°C
TKw
TVHw
0 -10 °C
TA
gem
Factory setting
70
.
OEM
CE1P2379E
15.07.2002