Siemens LMU64 Series - 3.7 Consumer management (CM)

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Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 3 Functions 07.11.2002
3.7 Consumer management (CM)
Consumer management includes the functions that relate to the interplay between the
consumer groups, also including external demands.
Examples are demands for heat resulting from space heating, DHW heating, or
demands resulting from operating actions.
Consumer management collects the various demands for heat from the consumer
circuits and ensures priorization. If required, several demands for heat are passed on:
• BwSpL DHW storage tank charging
• BwSpFs Frost protection for the DHW storage tank
• BwDlhA Instantaneous DHW heater, demand for outlet temperature
• BwDlhB Instantaneous DHW heater, standby demand
• BwDlhFs Instantaneous DHW heater, demand for frost protection
• BwSchS DHW stratification storage tank, quick charging
• BwSchL DHW stratification storage tank, slow charging
• BwSchFs DHW stratification storage tank, frost protection
• Hz1 Demand for heat pump circuit / boiler circuit
• HzFs1 Demand for frost protection pumps / boiler circuit
• Hz2 Demand for heat mixing circuit / pump circuit 2
• HzFs2 Demand for frost protection mixing circuit / pump circuit 2
• HzZone Demand for heat from the zone (heating circuits via LPB)
• Aus No demand for heat
Priorization of demands for heat:
Priority Demand for heat with
absolute priority
Demand for heat with
no priority
1 BwDlhA BwDlhA
BwSpL BwSpL
BwSchS BwSchS
Hz1
Hz2
HzZone
2 BwDlhB BwDlhB
BwSchL BwSchL
HzFs1
HzFs2
3 BwSpFs BwSpFs
BwDlhFs BwDlhFs
BwSchFs BwSchFs
4 Hz1
Hz2
HzZone
5 HzFs1
HzFs2
Demands for heat of the same priority can be satisfied at the same time (if not excluded
by the hydraulic system). Subordinate priorities will be locked and must wait until the
higher priority is satisfied.
Determining the
demands for heat
Priorization of demands
for heat