Lennox LCH036 Installation Instructions Manual page 194

Set Velocity Setpoint
1- Measure DC voltage between TB22-6 and TB22-10.
2- Multiply DC voltage by 25.4 to obtain the sensor
voltage.
3- Round the result to the nearest whole number. Enter
the result in Unit Controller ECTO 9.02. See Settings -
Control - ECTO menu in the Unit Controller manual.
Readout X 25.4 = A24 Sensor Voltage
__________ Record Sensor Voltage Here
Velocity Sensor Range
The velocity sensor is factory-set for 0-5m/s. (0-984ft/min.)
If a higher velocity is required, move the sensor jumper as
shown in figure 53.
VELOCITY SENSOR (A24) RANGE
0-5m/s
(0-984ft/min.)
Factory
Setting
V+
GND
AV
A24 Velocity Sensor
Page 50
0-7.5m/s
(0-1476ft/min.) (0-1968ft/min.)
1
2
V+ - 24VAC
GND - Common
3
AV - Airflow Output
(0-10VDC)
FIGURE 53
LGH/LCH420, 480, 540, 600
0-10m/s