Siemens Synco 200 - Heat Recovery (HREC)

8.3 Heat recovery (HREC)
8.3.1 Purpose and activation
The HREC function block controls HR equipment or mixing dampers with a
DC 0…10 V signal.
Purpose of HREC
The HREC function block is not available with the RLU220 controller.
Note
To activate the HREC function block, you must assign an output (Y x) to it.
Activation
Notes If you use the HREC function block to control mixing dampers, ensure that TYPE is
set to DMP. This refers to the control of the outside air dampers.
8.3.2 External preselection (IN X)
You can connect the load signal for HR from the sequence controller to the HR
equipment.
Maximum selection in
case of several load
signals
Additionally, it is also possible to use an analog input (IN X) as the load signal.
If one or a maximum of 2 internal load signals plus an external load signal are
connected at the same time, the controller uses maximum selection. This provides
for combination of an external load signal from another RLU2.. universal controller
with the internal maximum economy changeover (MECH), for example.
The external signal is considered only if the controller operates in Comfort or
Economy mode!
Note
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Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Aggregates 29.08.2008