Thermostat Control Wiring - AAON RN SERIES Installation Operation & Maintenance

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. Motor overload protection
may be a function of the variable frequency
drive and must not be bypassed.
CAUTION
Rotation must be checked on all
MOTORS AND COMPRESSORS of
three phase units.
exhaust fan,
condenser fan motors should all be
checked by a
technician at startup and any wiring
alteration should only be made at the
unit power connection.
38
= 230V, then
Supply fan,
return fan, and
qualified service
CAUTION
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 should be checked by a
qualified service technician at startup
using suction and discharge pressure
gauges 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.
If any factory installed wiring must be
replaced, use a minimum 105°C type AWM
insulated conductors.
CAUTION
No variable speed compressor shall
operate below 35 Hz. Operating
variable speed compressors outside
the frequency range specified in this
manual voids all warranties and may
result in compressor failure.

Thermostat Control Wiring

If a thermostat is used for unit control,
thermostat should be located on an inside
wall 4-5 feet above the floor where it will
not be subjected to drafts, sun exposure, or
heat from electrical fixtures of appliances.
Control wiring must deliver adequate
voltage to components to assure proper
operation. Control voltage returning from
controller circuit must be a minimum of 21
VAC. To assure proper wiring use the
following chart to determine the allowable
wiring distances.