O P E R AT I N G A N D I N STA L L AT I O N I N ST R U CT I O N S SYST E M V E N T E C H LG 5 0 0 P
PAG E 1 5
4.3.1 Post heating via pumped hot water
re-heating exchanger (PWW-NHR)
In order to be able to increase the air
outlet temperature for the living area
further after the heat exchanger,
additional external heating can be
installed. This afterheating can be
achieved via an external warm water
heater battery integrated into the air line
system.
The supply air exit temperature may
be increased using one or two optional
heating exchangers in the air duct
system, operating using hot water or
electrical power.
The integrated controller will control
individual components such as the
circulating pump, mixing valve etc.
4.3 OPTIONAL: OPTIONAL: SYSTEM
EXTENSION FOR EXTERNAL
AUXILIARY HEATING
The pumped hot water re-heating
exchanger (PWW-NHR) mixer valves
are controlled via 0-10 V signals
(continuous). The circulating pumps will
also be activated on demand.
The following temperatures may be used
as control parameters:
• Constant supply air temperature
• Constant extract air temperature
• Constant ambient air temperature
• Constant supply/extract air difference
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A P-band parameter will be configured
for heating the supply air. This P-band
will reflect all installed units (internal
heat exchanger, NHR I and NHR II). The
heat exchanger will be used first when
heat is required. NHR I and NHR II will be
switched in if more heat is needed.
4.4 OPTIONAL: DEMAND-DRIVEN
PLANT OPERATION
The Pichler Air2 system can offer seve-
ral options for demand-driven air flow
control:
• Constant CO
2
/RH value
• Fan optimiser
• GreenZone
• PI zone module / PI optimiser
