Limitation Of The Return Temperature - Siemens Synco700 RMK770 Documentation Handbook

Important
Extra configuration
Settings
Maximum limitation
Building Technologies
HVAC Products
Variant
2 room sensors or
1 Konnex room
sensor and 1 room
unit QAW740*
1 room sensor di-
rectly connected and
1 Konnex room
sensor (or 1 room
unit QAW740)
* 2 QAW740 room units are not permitted! Operation in the room is only possible on one unit
In the case of a room control combination with a ventilation system, the correct location
of the sensors on the ventilation side must be observed.
Mounting the sensor for acquiring the room temperature in the extract air in combina-
tion with a heating circuit is not permitted!
The sensor for room temperature control of the ventilation system must be located in
the room. If this is not observed, the heating circuit will operate with the wrong tempera-
ture when the ventilation plant is shut down.

10.4.2 Limitation of the return temperature

The heating circuit's mixing valve can be used for either maximum or minimum limita-
tion of the return temperature, depending on the hydraulic system.
Y1
B1
M1
B7
Maximum limitation
B1
Flow sensor
B7 Return sensor
M1 Heating circuit pump
Y1 Heating circuit mixing valve
The function is to be activated via extra configuration:
> Heating circuit > Inputs > Return sensor Assign terminal
> Heating circuit > Functions > Type of return temp limitation
Main menu > Commissioning > Settings > ... or
Main menu > Settings > Heating circuit > Limitations
Operating line
Return temperature min*
Return temperature max*
* Displayed or hidden, depending on the type of limitation
If the return temperature exceeds the maximum value TRLmax, the heating circuit's
flow temperature setpoint will be lowered. If the return temperature falls below the limit
Boiler Sequence Controller RMK770
10 Heating circuit control
Effect
If the RMK770 on the bus is
activated, the heating circuit
receives the room temperature
of the same geographical zone.
The heating circuit operates with
the average of the 2 tempera-
ture signals received.
If the RMK770 on the bus is
activated, the heating circuit
receives the room temperature
of the same geographical zone.
The heating circuit operates with
the average of the 2 tempera-
tures.
B7
Minimum limitation
Range
---- / 0...140 °C
--- (none) / 0...140 °C
Diagram
T T
T
Y1
B1
M1
Factory setting
----
----
Synco
T
Synco
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CE1P3132en
01.03.2005