Siemens LMU64 Series - Page 101

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Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 7 DHW control (BWR) 07.11.2002
• Control sensor: 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
• Boiler output: Min. power (fixed value)
• Setpoint: Parameter «TbwBereit» or «T_set_DHW» according to outlet
temperature control (can be adjusted via «KonfigRg2,Bit1»)
• Differentials: - «SdBwEin2», «SdBwAus2Max» when using sensor B3 for
the control
- «SdHzAus», «SdHzEin» when using sensor B2 for the
control
- Without additional heat demand:
1)
After the time «Z_BwComfort1»
- With additional heat demand:
1)
After the time «Z_BwComfort2»
After this period of time, the LMU… switches to
the heating circuit and comfort control will be
terminated!
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»).
1) Additional external heat demand via HC 1 / 2, RVA..., etc.
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
Z_BwComfort1 Z_BwComfort1 Z_BwComfort2 Z_BwComfort2 Z_BwComfort2
Heat demand
1
1
0
0
FS-DHW
T_set_DHW
TbwBereit
7494d28E/0102
Control
End of demand
Pump / diverting valve
overrun