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Free cooling economizer unit is supplied with
economizer and fresh air hood as a standard feature.
Fresh air percentage can vary from 0 to 100%.
An economizer consists of:
• A motorized damper with separate fresh air and return
air sections.
• A fresh air hood with a grill delivered folded in the
unit.
• All necessary sensors for free cooling operation.
The mechanical opening of the damper is managed by
the actuator which is adjusted by Trane controller.
Damper is activated in free cooling mode and may be
further controlled by temperature control with return
and outdoor air sensors or by enthalpy control with
addition to temperature sensor of return and outdoor
humidity sensor.
Fresh air hood installation
Figure 15 - Fresh air hood assembly steps
Step 1
Step 3: lift up the hood
vertically to insert it
Caution: In case of ERC, installation of ERC module has
to be made prior to fresh air hood.
RT-SVX056D-GB
Step 2: Position side flange
with corner on the outside
Step 4
Building Pressurization Control
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.
Barometric damper is available as option into
economizer option on downflow and not compatible
with heat recovery module unit only.
When the pressure of the building increase, the
dampers open and relieve air to the outside.
If the return air duct pressure drop is higher than the
building overpressure, the dampers will not open.
If the return air duct pressure drop is lower than the
building overpressure, the dampers will open and
relieve air outside of the building.
Figure 16 - Barometric relief
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