Assortment / System Description

Room pressurization and fume hood control
Pressurized room, temperature control
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21.7.3 Temperature control
Temperature control works with the actual room temperature setpoints for the
actual operating mode and calculates a set volume flow that moves between
the minimum and maximum setpoints.
The minimum and maximum air volume flows for a VAV actuator can be
configured for each actuator.
Y Output signal TR Room temperature
SpH Effective heating setpoint SpC Effective cooling setpoint
YH Heating valve YC Cooling valve
VavSuAirFl
MaxH
Maximum air volume flow heating VavSuAirFl
MaxC
Maximum air volume flow cooling
VavSuAirFl
MinH
Minimum air volume flow heating VavSuAirFl
MinC
Minimum air volume flow cooling
VAV volume flow
Figure: Serial control sequence for a VAV application with modulating
heating valve
Y Output signal TR Room temperature
VAV volume flow SpH Effective heating setpoint
YH1 1-stage electric heating coils YH2 2-stage electric heating coils
VavSuAirFl
MaxH
Maximum air volume flow heating VavSuAirFl
MinH
Minimum air volume flow heating
Figure: Serial control sequence for a VAV application with 2-stage heating
valve
Sequence with
modulating heating
valve
Sequence with a
2-staged heating valve