AAON RN Series Installation Operation & Maintenance page 42

Note: All units are factory wired for 208V,
230V, 380V, 460V,
transformer configuration must be checked
by a qualified technician prior to service,
especially if unit is to be connected to a 208V
or 230V supply.
interchange the yellow and red conductor on
the low voltage control transformer.
Red-Black for 208V
Yellow-Black for 230V
Wire power leads to the unit's terminal block
or main disconnect. All wiring beyond this
point has been
manufacturer and cannot be modified without
effecting the
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.
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 2%.
Voltage imbalance is defined as 100 times the
maximum deviation from the average voltage
divided by the average voltage.
Example:
(221V+230V+227V)/3
100*(226V-221V)/226V
exceeds the allowable imbalance.
42
or 575V. The
For 208V service
completed by
unit's agency/safety
overheating and
= 226V, then
= 2.2%, which
Check voltage
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. Motor overload protection may
be a function of the variable frequency drive
and must not be bypassed.
the
Rotation must be checked on all
MOTORS AND COMPRESSORS of
three phase units. Supply fan, exhaust
fan, return fan, and condenser fan
motors must all be checked by a
qualified service technician at startup
and any wiring alteration must only be
made at the unit power connection.
Scroll compressors are directional
and will be damaged by operation in
the wrong direction. Low pressure
switches on compressors have been
disconnected after factory testing.
Rotation must be checked by a
qualified service technician at startup
using suction and discharge pressure
gauges and any wiring alteration must
only be made at the unit power
connection.
Wire control signals to the unit's low voltage
terminal block located in the controls
compartment.
imbalance at the unit
CAUTION
CAUTION