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Step 9 — Position Power Exhaust/Barometric
Relief Damper Hood —
All electrical connections have
been made and adjusted at the factory. The power exhaust
blowers and barometric relief dampers are shipped as-
sembled and tilted back into the unit for shipping. Brackets
and extra screws are shipped in shrink wrap around the damp-
ers. If ordered, each unit will have 4 power exhaust blowers
and motors or 4 barometric relief dampers.
1. Remove 9 screws holding each damper assembly in place.
See Fig. 31. Each damper assembly is secured with 3 screws
on each side and 3 screws along the bottom. Save screws.
2. Pivot each damper assembly outward until edges of damper
assembly rest against inside wall of unit.
Be careful when tilting blower assembly. Hoods
and blowers are heavy and can cause injury if
dropped.
3. Secure each damper assembly to unit with 6 screws across
top (3 screws provided) and bottom (3 screws from
Step 1) of damper.
4. With screws saved from Step 1, install brackets on each
side of damper assembly.
5. Remove tape from damper blades.
VAV DUCT PRESSURE TRANSDUCER — The VAV duct
pressure transducer (VAV inverter pressure transducer) is lo-
cated behind the filter access door on the lower inner panel.
See Fig. 32. A section of
1
⁄
4
-in. plastic tubing must be run
from the high-pressure tap on the differential pressure switch
and connected to a tap in the supply-air duct. The tap is usu-
ally located
2
⁄
3
of the way out on the main supply duct. Re-
move plug button in panel to route tubing.
VAV BUILDING PRESSURE TRANSDUCER — The VAV
building pressure transducer (modulating power exhaust pres-
sure transducer) is located behind the filter access door on
the inner panel. See Fig. 32. A section of
1
⁄
4
-in. plastic tub-
ing must be run from the high-pressure tap on the differen-
tial pressure switch to the conditioned space. The pressure
tube must be terminated in the conditioned space where a
constant pressure is required. This location is usually in an
entrance lobby so that the building exterior doors will open
and close properly. Remove plug button in panel to route
tubing.
NOTES:
1. Unless otherwise specified, all dimensions are to outside of part.
2. Dimensions are in inches.
Fig. 31 — Barometric Relief Damper and Power
Exhaust Mounting Details
29