Siemens LMU64 Series - Combinations of RU and Room Thermostat; Time Switch

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Siemens Building Technologies Basic Documentation LMU54... / LMU64... CC1P7494en
HVAC Products 3 Functions 07.11.2002
If, with regard to the switching program and the feedback signal from the room, different
plant components are connected, the following table applies for the assignment to the
heating circuits and the demands for heat.
When a RU is used, a room thermostat or time switch cannot be connected to that input.
For this reason, the table does not include these combinations.
Heating circuits of the RU are interpreted as nonexisting if, via the → configuration of
the heating circuits, they have not been parameterized as controlling heating circuits, or
if the heating curve slope has been deactivated.
RT1 or
SU1
RT2 or
SU2
RU RU1 RU2
Heat demand
HC1
Heat demand
HC2
Not present Not present – Not present Not present – –
Present Not present – Not present Not present RT1 / SU1
1) 2)
–
Not present Present Not present Not present Not present – RT2 / SU2
1)
Present Present Not present Not present Not present RT1 / SU1
1) 2)
RT2 / SU2
1)
Present Not present Present Not present Not present RT1 / SU1
1) 2)
RT1 / SU1
1)
Not present Not present Present Present Not present RU1 –
Present Not present Present Present Not present RU1 RT1 / SU1
1)
Not present Not present Present Not present Present – RU2
Present Not present Present Not present Present RT1 / SU1
1) 2)
RU2
Not present Not present Present Present Present RU1 RU2
Present Not present Present Present Present RU1 RU2
RT1 Room thermostat connected to RT input
SU1 Time switch connected to RT input
RT2 Room thermostat connected to OpenTherm input
SU2 Time switch connected to OpenTherm input and activated
(«KonfigRg1.Schaltuhr2Bw» = 0 and «KonfigRg1.Schaltuhr» = 1)
RU RU connected to OT input
RU1 Heating circuit of the RU, which controls heating circuit 1 of the LMU...
RU2 Heating circuit of the RU, which controls heating circuit 2 of the LMU...
– Present or not present
1)
Depending on parameter «KonfigRg1», time switch 1 / 2, following applies:
If this parameter = 1, time switch 1 / 2 is used
If this parameter = 0, room thermostat 1 / 2 is used
2)
If, with the AGU2.310, time switch operation is parameterized, the contact will not
be evaluated and replaced by the switching program of the operating section
Combinations of RU and
room thermostat / time
switch
Legend