Orion System VCM Controller - Manual (Page 15)

VCM Controller
Technical Guide
15
Figure 11: Supply Air and Return Air Temperature Sensor Wiring- Units Without MODGAS II or MHGRV II
GND
INPUTS
GND
AOUT1
AOUT2
GND
+VDC
AIN1
AIN2
AIN3
AIN4
AIN5
AIN7
Mount In HVAC
Unit Supply
Air Duct
Mount In HVAC
Unit Return
Air Duct OE331-21-VCM
VCM Controller Board
OE231
Supply Air Temperature Sensor
OE231
Return Air Temperature Sensor
Supply & Return Temperature Sensor
For applications that do not use either the AAON ® MODGAS II or
MHGRV II boards, the Supply Air & Return Air Temperature Sensors
must be wired as shown in the Figure 11 for proper operation. The
Supply Air & Return Air Temperature Sensors are 10K Type III ther-
mistor sensors. The Supply Air Temperature Sensor should be mounted
in the unit discharge plenum or in the supply air duct. The Return Air
Temperature Sensor should be mounted in the return air duct. If the
system has a Zoning Bypass Damper installed, be sure the return air
sensor is located upstream of the bypass duct connection.
Note: If your AAON
® HVAC unit uses the MODGAS II
Controller and/or the MHGRV II Controller, the
Supply Air Sensor must be wired to one of these
controllers and not to the VCM Controller.
Please see Figure 12 for Supply Air Temperature Sensor Wiring when
using the MODGAS II controller and/or the MHGRV II controller. The
Return Air Temperature Sensor always connects to the VCM controller
as shown in Figure 11