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Siemens Building Technologies
Basic Dokumentation RVA63.280, RVA53.280
CE1P2374E
Landis & Staefa Division
19.04.2001
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
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
23
73
Z
1
7
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)
Switching
differential of the boiler temperature (setting on line 3
OEM
)
Benefits
Description
Setting
Effect
