Trane Voyager 1 Rooftop Unit TSD - Manual (Page 47)

Unit Options
47 RT-SVX20A-E4
Barometric relief
The barometric relief allows to
minimize overpressure in the
building caused by the introduction
of fresh air. This option is typically
installed when fresh air intake is
below 25% of the nominal air flow
and when the return air pressure
drop is below 25Pa.
This option includes exhaust hoods
and gravity dampers located in the
return air section. When the
pressure of the building increase,
the gravity dampers open and
relieve air to the outside.
If the return air duct pressure drop
is higher than the building
overpressure, the gravity dampers
will not open.
If the return air duct pressure drop
is lower than the building
overpressure, the gravity dampers
will open and relieve air outside of
the building.
Figure 29 - Economizer flow chart with barometric relief
Downflow version Horizontal flow version
R = return
S = supply
F = fresh air
E = exhaust
S
R
F
E
S
F
R