Flame Rollout Switches; Burners; Primary Limit Control - Lennox EL296DF045XV36B Unit Information

4. Flame Rollout Switches (S47)
Flame rollout switch is a high temperature limit located on
top of the burner box, one on each side.- See figure 13. The
limit is a N.C. SPST manual‐reset limit. When S47 senses
rollout, the circuit breaks and the ignition control immedi­
ately stops ignition and closes the gas valve. Rollout can be
caused by a blocked heat exchanger, flue or lack of com­
bustion air. The switch is factory set to trip (open) at 210°F
and cannot be adjusted. The switch can be manually reset.
To manually reset a tripped switch, push the reset button lo­
cated on the control.

5. Burners

All units use inshot burners. Burners are factory set and re­
quire no adjustment. Always operate the unit with the burner
box front panel in place. Each burner uses an orifice (see
table 28 for orifice size) that is precisely matched to the burn­
Intake Air Top Cap
Sensor
Rollout Switch
Burner Box Cover
er input. Burners can be removed as a one piece assembly
for service. If burner assembly has been removed, it is critical
to align center of each burner to the center of the clamshell
when re-installing. See more detail in Section VI- MAINTE­
NANCE.
6. Primary Limit Control (S10)
The primary limit (S10) is located in the heating vestibule pan­
el. When excess heat is sensed in the heat exchanger, the
limit will open. If the limit is open, the furnace control energizes
the supply air blower and closes the gas valve. The limit auto­
matically resets when unit temperature returns to normal. The
switch must reset within three minutes or the SureLight control
will go into Watch guard for one hour. The switch is factory
set and cannot be adjusted. The switch may have a different
set point for each unit model number. See Lennox Repair
Parts Handbook if limit switch must be replaced,
EL296DFV HEATING COMPONENTS
Rollout Switch
FIGURE 13
Page 27
Burner Assembly
Ignitor
Manifold And Gas Orifices
Two-Stage Gas Valve