Siemens SIGMAGYR RVP540 Basic Documentation page 280

Boiler temperature
control
Switching differential
Single-stage burner
 Note
2-stage burner
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With 2-position control, heat is produced at certain intervals . The period of time during
which heat is generated is dependent upon the mass to be heated up (boiler mass plus
water content), the flow rate and the burner's output.
ON
OFF
w
• Setpoint for switching on
If the boiler temperature (TKx) falls by more than half the switching differential below
the currently valid boiler temperature setpoint (TKw), the burner will be switched on
• Setpoint for switching off
If the boiler temperature (TKx) exceeds by more than half the switching differential
the currently valid boiler temperature setpoint (TKw), the burner will be switched off
The time switching off occurs can be delayed by the minimum burner running time.
Also refer to setting 253
°C
40°C
1
BR
0
BR Burner
TKx Actual value of boiler temperature
TKw Boiler temperature setpoint
The second burner stage is switched on and off based on the settings made on the
operating lines:
• release limit (integral) of burner stage 2
• reset limit (integral) of burner stage 2
Basic Documentation RVP540 / RVP550
Description of the EXP settings
°C
.
EXP
TKx
SDK
t
TKw+SDK½
TKw
TKw-SDK
t
Switching differential
Time
Operating line 254 :
EXP
Operating line 255 :
EXP
CE1P2488en
½
18.10.2002