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The "OAS" Outside Air Sensor allows precise real time monitoring of the Outside Air temperature on your Zoned HVAC
BMPlus series or UZC series control panels system. The Optional "OAS" wires directly into the allowing the Control
System to monitor the outside air temperature in heating mode. Using the adjustable potentiometer on the Control
Panel, the installer can set the desired outdoor temperature changeover setting, to engage supplemental or backup
heating systems.
The OAS comes standard with the HK2000 Economizer System and the 072000 Smart Digital Humidity Control.
Refer to the HK2000 and the 072000 Technical Bulletins for the specific Outside Air Features & Functions provided, with
these products.
The OAS is a versatile device because it can be mounted on an outside wall or an outside air duct. See Page 2 & 3.
Make sure the OAS is mounted completely outside of the house, on the North, East, or West side of the building. Avoid
direct sunlight. Do not mount the OAS low to the ground where snow can cover it. Do not mount the OAS close to exhaust
vents of any type. Use a dedicated 2 conductor 18AWG solid copper jacketed thermostat cable to connect the
OAS to the Zone Control System, Economizer or the Smart Humidistat. Avoid running cable in close proximity
to line voltage circuits, or inside a conduit with other circuits. Avoid wire runs in excess of 100 ft.
The Sensor wiring is not polarity sensitive. OAS equipped panels have a designated terminal block for the OAS. Be sure
to remove the factory supplied resistor on the Outside Air Sensor terminal block of the panel, and connect the
field wiring to those terminals instead. On some panels, make sure you enable the OAS Dip switch. Now dial in the
Outside Air Changeover setting you desire. Dual fuel Heat Pumps and Multi-Stage Heating systems can be controlled
without the need for bulky mechanical outside air thermostats or expensive dual fuel kits.
To test an OAS disconnect the wire leads from the control panel and remove it from the duct. At room temperature (75°F.)
the ohm reading on an OAS will be approximately 10.5K ohms (10,500 ohms). Or leave the OAS where it is and place a
separate temperature probe of known accuracy in the same location as the OAS and measure the OAS resistance
against the table provided on page 4. You should measure a value within 5% of the table value and the separate
temperature probe reading.
MAJOR PARTS INCLUDED IN THE "OAS" OUTSIDE AIR SENSOR ASSEMBLY
Cover Top View
EW
CONTROLS INC.
Housing Side Open View
EW
C
7
CONTROLS INC.
Cover Side View
C
Sensor Assembly with Protective Sleeve & 12" wire leads
END CAP
5/16"
DIAMETER
385 Hwy. 33 Englishtown, NJ 07726
Ph: 800-446-3110 - Fx: 732-446-5362
SUBMITTAL SHEET
(OUTSIDE Air Sensor)
Cover Bottom View
1/4" Tube Assembly with Integrated Back Plate
5 3/4" INSERTION
Model OAS
Housing Internal View
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