AAON RN Series, Installation Operation & Maintenance, Page: 48 / 136

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Table 8 - RN-E Cabinet Single Circuited
Variable Speed Compressor VFD Frequency
Range
Model (RN-)
Compressor VFD
Range (Hz)
208V and 230V Units
055, 065 & 075-
140
35-60 Hz
380V, 460V, and 575V Units
055, 065, 075, 090,
120, 130
35-75 Hz
105, 140 35-60 Hz
Table 9 - RN-E Cabinet Tandem Circuited
Variable Speed Compressor VFD Frequency
Range
Model (RN-)
Compressor VFD
Range (Hz)
208V, 230V, 380V, 460V and 575V
Units
055, 065, 075, 090,
105
40-70Hz
120 & 140 35-60 Hz
130 35-65 Hz
Thermostat Control Wiring
If a thermostat is used for unit control, locate
the thermostat 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.
Table 10 - Control Wiring
Wire Size
(Stranded) - Copper
Conductors Only
Total Wire Distance
Allowable
20 AWG 200 ft
18 AWG 350 ft
16 AWG 500 ft
14 AWG 750 ft
12 AWG 1250 ft
Total Wire Distance Allowable =
(Quantity of Control Wires) x
(Control Wire Distance)
Take the total wire distance allowable and
divide by the quantity of wires to be
connected. This indicates the distance
allowable for that size wire. The wiring to the
unit must not exceed the total wire distance
allowable. If the voltage at the connectors is
less than 21 VAC, isolation relays must be
installed. If under external control 21 VAC
must be field verified.
All external devices must be powered via a
separate external power supply.
Example:
A total of 8 wires must be pulled 75ft to a
control the unit. What size wire must be
used?
According to the Table 10, 16 AWG allows
for 63ft (500 ft/8 wires) and 14 AWG allows
for 94ft (750 ft/8 wires). Thus, 14 AWG must
be used.
Condensate Drain Piping
6-25 and 30 ton units are equipped with one
condensate drain pan connection on the right
side of the unit. 26 and 31-140 ton units are
equipped
with two condensate drain
connections, one on the left side of the unit
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.
CAUTION