Service - Lennox LCH036 Installation Instructions Manual

MANUAL DAMPER SET DIP SWITCH
(Damper Set)
NOTE - "Damper set" mode locks
economizer into minimum position.
FIGURE 36
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.
Velocity Sensor Range
The velocity sensor
(0-984ft/min.) If a higher velocity is required, move the
sensor jumper as shown in figure 37.
VELOCITY SENSOR (A24) RANGE
0-5m/s
(0-984ft/min.) (0-1476ft/min.)
Factory
Setting
V+ 1
GND 2
AV 3
A24 Velocity Sensor
FIGURE 37
OPEN
DSET
0
100
MIN POS
SET
is factory-set for
0-7.5m/s 0-10m/s
(0-1968ft/min.)
V+ - 24VAC
GND - Common
AV - Airflow Output
(0-10VDC)

Service

The unit should be inspected once a year by a qualified
service technician.
Label all wires prior to disconnection when servic­
ing controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.
A-Filters
Units are equipped with twelve 20 X 20 X 2" (508 X 508 X
51mm) filters. Filters should be checked monthly and
replaced when necessary with filters of like kind and
size. Take note of air flow direction marking on filter
frame when reinstalling filters. See figure 38.
NOTE-Filters must be U.L.C. certified or equivalent for
use in Canada.
B-Lubrication
All motors are lubricated at the factory. No further
0-5m/s.
lubrication is required.
Page 41
CAUTION
REMOVE FILTERS
FIGURE 38
PULL TO
REMOVE
FILTERS