Sequence Of Operation - Lennox SL280DFNV Series Unit Information

VII- Wiring and Sequence of Operation
Integrated Control Self Check
When there is a call for heat, the communicating enabled
integrated control runs a self check. The control checks
for S10 primary limit and the S47 thermal switch switch
normally closed contacts. The control also checks for
S102 high heat and S128 low heat prove switch normally
open contacts. Once self check is complete and all safety
switches are operational, heat call can continue.
NOTE - The ignition control thermostat selection DIP
switch is factory-set in the "TWO-STAGE" position.
Fire Hazard. Use of aluminum wire with this product
may result in a fire, causing property damage,
severe injury or death. Use copper wire only with
this product.
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WARNING