56
through it. Use the following procedure to
cut a round hole in a foam panel.
1. Locate the placement of the hole. Be sure
that the conduit will not interfere with the
operation of any component or prevent
access of any door or removable panel.
2. Drill a pilot hole all the way through the
foam wall or roof.
3. Using a hole saw cut the hole through the
metal on both sides of the foam part.
4. With a knife cut the foam out of the hole.
5. After the conduit or pipe is installed in the
hole caulk the entire perimeter of the hole on
both sides with an industrial grade silicone
sealant or a duct seal compound.
If a larger cut-out is needed for additional
duct connections not provided by the
factory, or for any other reason, it is very
important that the foam be completely
sealed.
Insulation
covers
should
be
fabricated from sheet metal to cover the
foam at the cut. The edges and corners that
are not covered should then be sealed using
silicone caulking or a duct seal compound.
If a reciprocating saw is used to make the
cut-out take care that the metal skins of the
foam part do not separate from the foam,
this would result in reduced structural
integrity of the part.
Dampers and Actuators
AAON damper blades are connected with
interlocking gears. A coupling is attached to
one of the gears for connection to the
actuator.
Factory provided actuators have a spring
return. The recommended configuration is
that the return air actuator should return to
an open position and the exhaust and outside
air should return to a closed position.
It is recommended that field provided
actuators also be spring return with the same
configuration listed above.
The factory provided actuators use a 24V
power supply and are either on/off or
modulating using a 2-10 VDC signal.
Figure 30 - Dampers
Care should be taken to ensure that
the dampers do not fail to a position
where all are closed while the fan is
still running. This can result in
damage to the unit.
WARNING
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