Siemens RVA63.242 - Minimum Flow Temperature Setpoint Contact H (Tvhw)

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Siemens Building Technologies Basic Documentation RVA63.242, RVA53.242 CE1P2373E
Landis & Staefa Division Description of heating engineer settings 26.03.2001
4.79 Minimum flow temperature setpoint contact H
(TVHw)
Temporary start-up of boiler via switching contact.
Handling of heat demand signals from devices incompatible with LPB.
Setting of temperature demand the boiler maintains when contact H is closed. Also
refer to "input H1 and input H2" in Index.
Setting range Unit Factory setting
8...TKmax °C 70
TKmax Maximum limitation of boiler temperature
The level of the minimum flow temperature setpoint will be adjusted.
Prerequisite:
This setting is used only if one of the inputs H1 or H2 (setting line 170 or 174) is set to
"Minimum flow temperature setpoint".
The boiler temperature is maintained at least at this minimum level, even if the demand
for heat continues to drop. The switching differential in that case is the same as that
with a normal temperature demand:
TVHw +/- 1/2 SDK
-30 -20 -10 0 -10
40
30
60
50
80
70
TK
TKmin
TKw
SDK
2373Z17
TA
°C
°C
gem
0
TVHw
TKw Boiler temperature setpoint
TKmin Minimum limitation of boiler temperature setpoint (setting on line 81)
TVHw Minimum setpoint of flow temperature, contact H, (setting on line 171)
SDK Switching differential of the boiler temperature (setting on line 3
OEM
)
Benefits
Description
Setting
Effect