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To pass wires through the wall or roof of the
unit, cut a hole and pass conduit through it.
Use the following procedure to cut a round
hole in a foam panel.
Cutting Electrical Openings
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. Field cut openings must be a
minimum of 15 centimeters
(6 inches) away from all components
and wiring to prevent damage due to
drilling or cutting.
2. Drill a pilot hole all the way through the
foam panel.
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 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 must be fabricated from
sheet metal to cover the foam at the cut. The
edges and corners that are not covered must
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.
Size supply conductors based on the unit
Minimum Current Ampacity (MCA) rating.
Supply conductors must be rated a minimum
of 75°C (167°F).
Protect the branch circuit in accordance with
code requirements. The unit must be
electrically grounded in accordance with
local codes, or in the absence of local codes,
the current National Electric Code,
ANSI/NFPA 70 or the current Canadian
Electrical Code CSA C22.1.
Note: Units are factory wired for 208V,
230V, 460V or 575V. In some units, the
208V and 230V options may also be provided
in single or three phase configurations. The
transformer configuration must be checked
by a qualified technician prior to startup.
Wire power leads to the unit’s terminal block
or main disconnect. All wiring beyond this
point has been completed by AAON and
cannot be modified without effecting the
unit’s agency/safety certification.
Supply voltage must be within the min/max
range shown on the unit nameplate. Available
short circuit current must not exceed the short
circuit current rating (SCCR) shown on the
unit nameplate.
Three phase voltage imbalance will cause
motor overheating and premature failure.
The maximum allowable imbalance is 2%.
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