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Building Technologies Division User Manual LMS14... CC1U7471en
6 The settings in detail 07.05.2014
Line no. Operating line
2324 Speed Xp
Line no. Operating line
2325 Speed Tn
Line no. Operating line
2326 Speed Tv
Boiler pump speed range:
The boiler pump speed is limited by a minimum and maximum permissible speed.
To ensure reliable startup, the pump is started running at the parameterized starting
speed for 10 seconds.
Line no. Operating line
2327 Pump speed min OEM
Minimum limitation of pump speed at the OEM level.
Line no. Operating line
2328 Pump speed max OEM
Maximum limitation of pump speed at the OEM level.
Line no. Operating line
2329 Pump setpoint reduction
This parameter is used to set the setpoint reduction for the boiler pump’s speed control.
This setpoint reduction is only active in connection with Pump modulation (2320).
Line no. Operating line
[6066.1] LimMinBoilPumpMod
Off
On
The burner shall be prevented from shutting down or the boiler temperature shall be
prevented from exceeding the safety limiter thermostat cutout temperature due to
residual heat because pump modulation is not sufficiently high. For this reason, the
pump’s minimum permissible modulation is constantly adapted, depending on boiler
temperature and burner modulation.
This ensures that the modulating boiler pump operates above the parameterized
minimum modulation when…
- the burner is started with 100% burner modulation,
- the burner reaches the switch-off threshold with burner modulation above the
minimum output,
- the boiler temperature lies above the switch-off threshold.
Also, when the burner is switched on, the pump’s minimum modulation is limited to
100% for 10 seconds, thus setting modulation to the maximum.
The function can be deactivated.
Off
Function is deactivated.
On
Function is activated.
Speed Xp
Speed Tn
Speed Tv
Pump speed
minimum/maximum
Pump speed min OEM
Pump speed max OEM
Pump setpoint reduction
LimMinBoilPumpMod
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