AAON V3-A Installation, Operation & Maintenance Instructions Manual page 39

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.
Size supply conductors based on the unit
Minimum Current Ampacity (MCA) rating.
Supply conductors must be rated a minimum
of 75°C.
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
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 should not exceed the
short circuit current rating (SCCR) shown on
the unit nameplate.
Electric Code,
CAUTION
Three phase voltage imbalance will
cause motor
premature failure.
Three phase voltage imbalance will cause
motor overheating and premature failure.
The maximum allowable imbalance is 5%.
Voltage imbalance is defined as 100 times the
maximum deviation from the average voltage
divided by the average voltage.
Example:
(218V+237V+235V)/3
100*(230V-218V)/230V = 5.2%, which
exceeds the allowable imbalance.
Check voltage imbalance at the unit
disconnect switch and at the compressor
terminal. Contact your local power company
for line voltage corrections.
Installing contractor must check for proper
motor rotation and check blower motor
amperage listed on the motor nameplate is
not exceeded.
CAUTION
Rotation must be checked on all
MOTORS of three phase units.
Supply fan motors should all be
checked by a
technician at startup and any wiring
alteration should only be made at the
unit power connection.
Wire control signals to the unit's low voltage
terminal block located in the controls
compartment.
overheating and
= 230V, then
qualified service
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