Lennox B050A3B, Installation/Servicing Instructions And Users Information Manual

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Page 20 of 36 506307-01 Issue 1207
The switches are located behind the burner access
panels they are accessed by removing the burner access
panels from the furnace, and are reset by pushing in the
button in the middle of the switch (between the two wire
connections - See Figure 11). Very little force is required to
push the reset button, and a “click” should be heard when
the switch resets.
Figure 11
FLAME ROLLOUT SWITCH
Pressure Switch Check:
To check the operation of the pressure switch vent safety
control, remove the vent from the combustion blower. Place
the furnace into operation. Gradually cover up the blower
outlet; the main burners should shut OFF. Remvoe the
restriction and the unit should relight. Replace the vent
adaptor and reseal the opened joints as required.
The operational checkout is now complete. Be sure to
adjust the thermostat to the desired setting and inform the
homeowner how to operate the furnace system before
leaving the job site.
If the pressure switch activates to shut the furnace down,
the vent system must be checked and cleared. Failure
to do so may result in serious bodily harm or nuisance
furnace shutdown and/or a hazardous condition that may
lead to property damage, personal injury or death.
WARNING