Orion System MUA II Controller - Manual (Page 10)

Technical Guide
MUA II Controller 10
Outside Air Temperature Sensor
The Outside Air Sensor must be wired as shown in the illustration be-
low for proper operation. The Outside Air Temperature Sensor is a 10K
Type III thermistor sensor. The sensor should be mounted in the up-
right position as shown, in an area that is protected from the elements
and direct sunlight. Be sure to make the wiring splices inside of the
Outside Air Temperature Sensor weathertight enclosure. See Figure 10
for detailed wiring.
Caution: Be sure to mount the Outside Air Sensor in an
area that is not exposed to direct sunlight. A
shaded area under the eve of the building or
under the HVAC unit rainhood is normally a good
location. If sensor is not located as specified,
erroneous outside air temperature readings will
result. Unused conduit opening(s) must have
closure plugs installed and must be coated with
sealing compound to provide raintight seal.
Water can damage sensor!
Wiring Details
GND
INPUTS
GND
AOUT1
AOUT2
GND
+VDC
AIN1
AIN2
AIN3
AIN4
AIN5
AIN7
Outdoor
Air Temperature
Sensor
Make Splice Connections
Inside Sensor Enclosure
As Shown. Seal All
Conduit Fittings With
Silicone Sealant.
Mount Sensor Outdoors
In Shaded Protected
Area & In Upright
Position As Shown
Figure 10: Outside Air Temperature Sensor Wiring
GND
INPUTS
GND
AOUT1
AOUT2
GND
+VDC
AIN1
AIN2
AIN3
AIN4
AIN5
AIN7
MUA II Controller Board
Remote Occupied
Contact
(Relay By Others)
Figure 11: Remote Occupied Contact Wiring
Remote Occupied Contact
A Remote Occupied contact closure supplied from another Building
Automation System device can be used to enable Occupied and Unoccu-
pied modes on the MUA II controller. This relay contact must be a dry
contact and be wired as shown below. See Figure 11 below for detailed
wiring .