Minimum Flow Temperature Setpoint Contact H (Tvhw) - Siemens RVA63.280 Basic Documentation

Benefits
Description
Setting
Effect
126/184
Siemens Building Technologies
Landis & Staefa Division
2.56 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
8...TKmax
...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:
TK
°C
80
70
60
50
40
TKmin
30 0
-30 -20
TKw Boiler temperature setpoint TKmin
on line 81) TVHw Minimum setpoint of flow temperature, contact H, (setting on line 171)
differential of the boiler temperature (setting on line 3
Basic Dokumentation RVA63.280, RVA53.280
Unit
°C
TVHw +/- 1/2 SDK
-10 0
Minimum limitation of boiler temperature setpoint (setting
)
OEM
Factory setting
70
TKw
TVHw
-10
°C
TA
gem
Switching
CE1P2374E
19.04.2001