Functions; Minimum Temperature Differential Of The Wood-Fired Boiler - Siemens SIGMAGYR RVP540 Basic Documentation

Benefit
Description
Setting
Effect
Special displays
Siemens Building Technologies
HVAC Products

Functions

4.111 Minimum temperature differential of the
wood-fired boiler
• Pump Q10 of the wood-fired boiler operates only when there is a sufficient tem-
perature differential
To avoid unnecessary activation or delayed deactivation of the boiler pump, there must
be a minimum temperature differential between flow and return (minimum temperature
differential of the wood-fired boiler).
Setting range
- - - / 0...20
With small temperature differentials between boiler flow and return, the amount of heat
that can be delivered is too small. If the temperature differential of the wood-fired boiler
falls below the minimum, the boiler pump will be deactivated on completion of the pump
overrun time (operating line 372), even if it should still be running according to the crite-
ria of operating lines 370 and 371.
"- - -" will deactivate the function.
The diagram below shows a possible progression of the temperature of the wood-fired
boiler and the relevant switching states of the boiler pump (Q10):
Also refer to the graph on operating line 370.
[°C]
ON
Q10
ON
OFF
TV Actual value B22 of temperature of the wood-fired boiler
T Return temperature B72
R
Q10 Pump of the wood-fired boiler
370 Minimum temperature of the wood-fired boiler for release of the pump
371 Switching differential for "Minimum temperature of the wood-fired boiler for release of the pump"
372 Pump overrun time
380 Minimum limitation of the return temperature of wood-fired boilers
EXP
– – – Minimum temperature differential of the wood-fired boiler OFF
Basic Documentation RVP540 / RVP550
Description of the heating engineer settings
Unit
K
TV
TR
Factory setting
4
OFF
t [s]
t [s]
165/348
CE1P2488en
18.10.2002