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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 11 Function block: Boiler 15.03.2011
11.3 Limitations
11.3.1 Maximum limitation of boiler temperature
For maximum limitation of the boiler temperature, the maximum limit value can be
set. The switch-off point cannot be higher than the maximum limit value.
The switch-on point is then lower, the difference being the set switching differential.
If the boiler temperature is limited to a maximum, the display shows
.
This maximum limitation is not a safety function; for that purpose, a thermostat or
thermal reset limit thermostat, etc., must be used!
11.3.2 Minimum limitation of boiler temperature
For minimum limitation of the boiler temperature, the minimum limit value can be
set. The switch-on point cannot fall below the minimum limit value.
The switch-off point is then higher, the difference being the set switching differen-
tial.
If the boiler temperature is limited to a minimum, the display shows
.
11.3.3 Actions during d.h.w. heating
Maximum and minimum limitation are also active during d.h.w. heating.
11.4 2-position control
2-position control maintains the required boiler temperature by switching a 1- or 2-
stage burner.
11.4.1 Control with 1-stage burner
For 2-position control with a 1-stage burner, the variables that can be set are the
switching differential and the minimum burner running time.
The controller compares the actual value of the boiler temperature with the set-
point. If the boiler temperature falls by half the switching differential below the set-
point, the burner is switched on. If the boiler temperature exceeds the setpoint by
half the switching differential, the burner is switched off.
T
K
2524D06
ON
OFF
T
Kw
SD
2
SD
2
SD Switching differential
T
K
Boiler temperature
T
Kw
Boiler temperature setpoint
46


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