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Siemens Building Technologies
Basic Documentation LMU54... / LMU64...
CC1P7494en
HVAC Products
3 Functions
07.11.2002
The RU is a multifunctional unit for 1 or 2 heating circuits. For that purpose, it has a
main heating circuit (heating circuit 1) and - only with the QAA73... - a secondary
heating circuit (heating circuit 2).
The choice which of the RU’s heating circuits acts on which of the LMU’s heating circuits
is made with the «KonfigHks» parameter. This parameter is conceived such that it
allows the RU’s influence on heating circuits 1 and 2 of the LMU... to be defined
separately.
For both heating circuits of the LMU..., the following choices exist:
•
No RU influence (0)
•
Controlled by the main heating circuit of the RU (1)
•
Controlled by the secondary heating circuit of the RU (2)
When no RU is used, this parameter is of no importance.
Control of an LMU’s heating circuit by the RU presupposes that the controlling heating
circuit in the RU is not deactivated (the heating circuits of the RU can be deactivated by
changing the slope).
If, in the RU, the heating circuit selected for the control is deactivated, the action is the
same as with setting «No RU influence» using the «KonfigHks» parameter.
The following assignments can be made:
Parameter
KonfigHks
RU influence on
heating circuit 2
of the LMU6x
RU influence on
heating circuit 1
of the LMU6x
Impact
0
0
0
Both heating circuits of the LMU... are without RU
influence
1
0
1
Hz2 without RU influence, Hz1 is controlled by the
main heating circuit of the RU, if RU is present
2
0
2
Hz2 without RU influence, Hz1 is controlled by the
secondary heating circuit of the RU, if RU is present
10
1
0
Hz1 without RU influence, Hz2 is controlled by the
main heating circuit of the RU, if RU is present
11
1
1
Both heating circuits of the LMU mare controlled by
the main heating circuit of the RU, if RU is present
12
1
2
Hz1 is controlled by the secondary heating circuit of
the RU, Hz2 by the main heating circuit of the RU, if
RU is present
20
2
0
Hz1 without RU influence, Hz2 is controlled by the
secondary heating circuit of the RU, if RU is present
21
2
1
Hz1 is controlled by the main heating circuit of the
RU, Hz2 by the secondary heating circuit of the RU,
if RU is present
22
2
2
Hz1 and Hz2 are controlled by the secondary
heating circuit of the RU, if RU is present
Configuration of the
heating circuits
