Siemens LMU54 Series Basic Documentation page 101

Control
End of demand
Pump / diverting valve
overrun
Siemens Building Technologies
HVAC Products
• Control sensor:
• Boiler output:
• Setpoint:
• Differentials:
- Without additional heat demand:
- With additional heat demand:
If a demand for heat is received only during comfort mode, the remaining time will be
shortened to «Z_BwComfort2» (if remaining time «Z_BwComfort1 > Z_BwComfort2»).
Additional external heat demand via HC 1 / 2, RVA..., etc.
1)
During comfort control:
• The relevant outputs in the DHW circuit are activated
After comfort control:
• Zhe relevant outputs in the DHW circuit are activated ( è KonfigRg2.0)
- If «B2 > TqNach»: As long as «B2 < TqNach»
or
- If «B2 < TqNach»: For the fixed time of one minute
1
Heat demand
0
1
FS-DHW
0
T_set_DHW
TbwBereit
Z_BwComfort1
Basic Documentation LMU54... / LMU64...
7 DHW control (BWR)
The control is effected either according to boiler sensor B2,
return sensor B7 or the Bw1 sensor (KonfigRg2).
If the boiler sensor is used, parameter «TuebBw» is added to
the setpoint
Min. power (fixed value)
Parameter «TbwBereit» or «T_set_DHW» according to outlet
temperature control (can be adjusted via «KonfigRg2,Bit1»)
- «SdBwEin2», «SdBwAus2Max» when using sensor B3 for
the control
- «SdHzAus», «SdHzEin» when using sensor B2 for the
control
1)
After the time «Z_BwComfort1»
1)
After the time «Z_BwComfort2»
After this period of time, the LMU... switches to
the heating circuit and comfort control will be
terminated!
Z_BwComfort1 Z_BwComfort2 Z_BwComfort2 Z_BwComfort2
CC1P7494en
7494d28E/0102
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07.11.2002