Lennox LB-114470G, Installation Instructions Manual

Page: 6 / 8

Page 6
Return Air Sensor
1. Open filter access door.
2. Insert return air sensor probe into hole (location shown
in figure 9). Secure with screws provided.
3. Connect A2 return air sensor plug P62 to A2 return air
sensor jack J62.
NOTE − When an optional field−provided A74 room air sen-
sor is installed, the controls contractor wires the sensor to
Prodigy Controller P298 Terminal Strip. Do not install the
return air sensor in these applications.
A2 RETURN
AIR SENSOR
J62/P62 RETURN AIR SEN-
SOR JACK/PLUGS
FILTER
SECTION
Figure 9. Return Air Sensor
Discharge Air Sensor RT1
1. Insert discharge air sensor probe into knockout as
shown in figure 10 (036, 060 units) or figure 11 (120,
240 units). Secure with two screws provided.
RT1 DISCHARGE
AIR SENSOR
(DAS)
DAS
PROBE
P63/J63
DAS CON-
NECTIONS
Figure 10. RT1 Discharge Air Sensor
(036, 060 Units)
2. Connect RT1 discharge air sensor plug P63 to RT1
discharge air sensor jack J63.
RT1 DISCHARGE
AIR SENSOR (DAS)
DAS PROBE
P63/J63 DAS
CONNECTIONS
Figure 11. RT1 Discharge Air Sensor
(120, 240 Units)
Wiring
Field Wiring
Controls contractor completes field wiring connections to
optional system components shown in dotted lines in fig-
ure 13.
Wiring Diagrams
Wiring diagram sections are affixed to inside of unit pan-
el in alpha−numeric order. Figure 12 shows an example
of a complete system diagram on an installation consist-
ing of an SGA240 unit with an electro−mechanical or
electronic control system and a modulating economizer.
Affix the C7" section wiring diagram, provided, over the
top of the existing C" section wiring diagram.
A2
Gas
Heating
Section
B7
Cooling or
Heating and
Cooling
Section
C2
Electro−
mechanical
Control
Section
D1
Modulating
Economizer
Section
AFFIX C7 WIRING DIAGRAM SECTION HERE
Figure 12. Complete System Diagram
Final Wiring Check
Before applying power to unit check the following wiring:
1. Jack/plug connections to DDC and RT1 sensor.
2. Jack/plug connections to system options such as elec-
tric heat or economizers.
3. Polarity of wiring between A16 control microproces-
sor, room air sensor if used, and TB1 terminal strip.
4. Line voltage to unit and/or options such as electric
heat.