Technical Guide
WALL MOUNTED E-BUS CO
2
SENSOR
3
Overview
The OE256-05 Wall Mounted E-BUS CO
2
Sensor is used for monitoring
space CO
2
levels and is designed for permanent wall mounting in the
conditioned space. It connects to the VCB-X Controller (OE335-23-
VCBX) and VCC-X Controller (OE338-26B-VCCX) using an EBC
E-BUS Expansion Cable. It can be daisy-chained with the E-BUS
Digital Room Sensor (OE217-02, OE217-03, OE217-04) for applica-
tions requiring both a space CO
2
sensor and space temperature sensor.
See Figure 1 for dimensions.
The OE256-07 E-BUS Duct Mounted CO
2
Sensor with Remote Pickup
utilizes an aspiration box. It is used for sensing the current CO
2
level in
the HVAC unit’s return air stream. It is designed to be mounted in the
return air duct of the HVAC unit and uses its integral aspiration box to
sample the CO
2
level in the duct.
This technical guide provides information for the Wall Mounted E-BUS
CO
2
Sensor only, for more information regarding the Duct Mounted E-
BUS CO
2
Sensor, please see the OE256-07 Duct Mounted E-BUS CO
2
Sensor Technical Guide.
Some typical applications are:
Controlling ventilation in a building where the occupancy
varies frequently
Controlling ventilation to ensure excess outdoor air is not
causing energy waste
Ensuring good air distribution throughout building zones
Sensor Overview
Features
The CO
2
Sensor provides the following:
Uses the patented dual beam Non-Dispersive Infrared
™
(NDIR) technology
A very accurate and stable sensor guaranteed to maintain
its accuracy due to infrared self-calibration feature of sensor
Sensor accuracy of +/- 50 ppm @ 1000 ppm or 2% of the
measured value
Annual drift of +/- 2 ppm per year
Measurement range of 0 to 2000 ppm
LED under front cover shows active CO
2
sensing
Addressable based on function within the system
4.54
2.80
0.96
0.80
Figure 1: Wall Mounted E-BUS CO
2
Sensor
Dimensions
Environmental Requirements
The E-BUS CO
2
Sensor needs to be installed in an environment that can
maintain a temperature range between 14°F and 122°F and a humidity
range between 5% and 95% RH (non-condensing).
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