Dual duct
A dual duct installation consists of separate primary heating and cooling ducts, both with
control dampers and airflow monitoring. For this type of installation a SimplyVAV BAC-8007
controls the cooling air (primary) damper and a TSP-8001 actuator controls the heating air
(secondary) damper.
l
As the space temperature rises above the cooling setpoint, the primary airflow is
modulated from the Cooling Minimum flow to the Cooling Maximum Flow.
l
As the space temperature falls below the heating setpoint, the secondary airflow is
modulated from the Heating Minimum flow to the Heating Maximum Flow.
l
Between the heating and cooling setpoints, both the primary airflow and secondary
airflow are modulated to maintain the Dual Duct Minimum airflow.
See the topic,
for an application drawing.
Illustration 7–7 Dual duct sequence
Max. cooling airflow
Ai
rf
lo
w
i
n
c
re
a
s
e
Max heating airflow
Dual duct
minimum
airflow
Room temp increase
HTG SPAN
CLG SPAN
HTG SP
CLG SP
MIN
CLG
CFM
MIN
HTG
CFM
SimplyVAV
Section 7: Sequences of operation
Revision H
61
Summary of Contents for SimplyVAV BAC-8001
Page 1: ...SimplyVAV Application and Installation Guide Revision H ...
Page 12: ...Section 1 About the controllers KMC Controls Inc 12 Revision H ...
Page 48: ...Section 6 Application drawings KMC Controls Inc 48 Revision H ...
Page 62: ...Section 7 Sequences of operation KMC Controls Inc 62 Revision H ...
Page 72: ...Appendix A K factors KMC Controls Inc 72 Revision H ...