Wiring And Sequence Of Operation - Lennox SL280UHV Series Unit Information

BURNER, COMBUSTION AIR INDUCER ASSEMBLY
&
HEAT EXCHANGER REMOVAL
Gasket
Flue Transition
Pressure Switch
Heat Exchanger
Ignitor
Rollout Switches
Orifice Plate
Collector Box
Combustion Air Inducer
Flame
Sensor
Retention Rings
Cross Over
Manifold And Gas Valve
FIGURE 25
Remove 5 screws if necessary
VII- Wiring and Sequence of Operation
(either side of cabinet)
Integrated Control Self Check
When there is a call for heat, the integrated control runs a
self check. The control checks for S10 primary limit, S21
secondary limit (s) and S47 rollout switch normally closed
1
contacts. The control also checks for S102 high heat and
S128 low heat prove switch normally open contacts. Once
2
self check is complete and all safety switches are opera-
3
tional, heat call can continue.
4
NOTE - The ignition control thermostat selection DIP
switch is factory-set in the "TWO-STAGE" position.
5
FIGURE 26
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