Siemens Climatix S300 HRV - Recirculating Air Damper

5.12.1 Recirculating air damper
Recirculating dampers (mixing air dampers) reuse energy from room air as much
as possible. Extract air is mixed with outside air where additional heating/cooling
devices are in the room and extract air is efficient enough. This controls the supply
air temperature and saves energy. It assumes control over the heating/cooling
sequence prior to the heat exchange device.
● For TEx > TOa + 2k, room air can be considered for heating. The recirculating
damper is controlled to fully open if the plant is also in heating mode. The
function is disabled for TEx<TOa.
● For TEx < TOa - 2k, room air can be considered for cooling. The recirculating
damper is controlled to fully open if the plant is also in cooling mode. The
function is disabled for TEx<TOa.
● TSuAfPreHcl is used instead of Toa when the preheating coil is active.
● The dehumidify/ CO
2
/ finedustfunction fully opens the outside air damper to
improve ventilation (i.e. air quality) when heating/cooling conditions are not met
for the recirculating damper.
● The free-cooling function fully closes the recirculating damper and fully opens
the outside air damper.
The function requires at least one 0-10Voutput for the recirculating damper
command.
The outside air damper command can be selected but is not required when there is
a mechanical rod connected to the recirculating damper.
The recirculating air damper operates in the opposite direction as the outside air
damper.
Diagram of a recirculating air damper (red box) as part of an air handling unit.
Application functionalities
Outside air dampers (DmpShoffOa11y)
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