AAON Mini Controller User Manual - Caution
12
Figure 4 - EOL and Pull-Up Switch Resistor
Positions on Reverse Side of Controller
See BACnet Points List section for
additional information.
Input Connections
Passive input devices require pull-up
resistors in the circuit. For passive input
devices, such as 10k Type 3 thermistors, on
the IN2 through IN4, set the pull-up
switches on the back of the circuit board to
the 10K position. For active voltage devices,
set the switches to the 0-12 V position.
The input switch pairs (3-4, 5-6, 7-8) must
not have both switches set to the left or both
set to the right. For example, if switch 3 is
set to the left, switch 4 must be set to the
right. The input pull-up resistor switch pairs
must be fully latched in either the 10K or 0-
12 V positions - even if a switch pair has no
input connected.
IN3 and IN4, the outside and supply air
temperature sensor inputs, should not be
changed and must always be set to the 10K
position.
For IN2, with factory provided sensors,
inputs should be set up as:
Suction pressure sensor - 0-12 V
Outside air humidity sensor - 0-12 V
CO
2
sensor - 0-12 V
Remote space temperature - 10K
Fan status - 0-12 V
The controller does not support 1k ohm
RTDs.
Remote Space Temperature Sensor
A maximum of 4 remote space temperature
sensors may be wired in a series-parallel
arrangement to provide an average remote
space temperature reading. With remote
space
temperature
sensor
averaging
configured this average remote space
temperature is then averaged with the
internal space temperature reading.
Supply Air Temperature Sensor
Supply air temperature sensor must be field
installed in the supply ductwork 6-8 feet
downstream from the unit to get an accurate
reading.
Output Connections
Connect the device under control between
the desired output terminal and the related
SC (Switched Common for relay outputs) or
GND (Ground for analog outputs). For a
bank of three relays, there is one SC
connection.
Figure 5 - Switched Common and Relays
Do not attach a device that draws current
exceeding
the
controller’s
capacity.
Maximum output current for individual
Analog outputs is 20 mA @ 12 VDC.
Maximum output current for individual
relays is 1 A @ 24 VAC/VDC or a total of
1.5 A per bank of 3 relays (relays 1-3, 4-6).
Relays 1-6 are NO, SPST, Form A.
Relays are for Class-2 (24 VAC) only.
Do not connect line voltage to the
relays.