8
Ozone Level Sensor
An optional remote Ozone sensor is available that detects the ozone concentration in the duct of the
heating/cooling duct.
The ComAir 20T will read the sensor and adjust the Ozone output to maintain a constant Ozone level.
The connections for it are on the PC Board mounted in the cover. The cover must be removed to access
the PC Board. A three conductor cable with wire sizes of 22 gauge or thicker is recommended for the
connection (not supplied). The cable can be routed through the unused strain relief mounted on the
chassis of the ComAir 20T.
The remote Ozone sensor supplied by OptiPure should be mounted in a HVAC duct as close to a supply
register as possible. The sensor box requires a hole to be punched in the duct for the sensor to fit into
and two holes to be drilled for the attachment to the duct with sheet metal screws. A template that can
be used to locate the holes is provided with the sensor
The connections are as follows: (See figure on next page as reference)
ComAir connection
Remote sensor connection:
-12V out (-)
GND
+12V out (+)
V+
+0-5V in (+)
0-5V
To use the Remote sensor, the switches on the PC Board must be set correctly:
Switch #
Position
Setting
1
Right
LEDs show sensor input signal
2
Left
Sensor connected
3
Left
Continuous signal
4
Left
1-on
5
Right
Off
