1010
Flame Roll-Out
Protection Device
Figure 4
Roll-out Protection Devices
Safety Circuits
Roll-out Protection Device
The roll-out limit is a normally-closed (electrically),
manual-reset, temperature-activated sensor. The roll-
out limit switch is located on one end of the burner
assembly (Figure 4). If there is an improper draw of
burner flames into the heat exchanger, the roll-out limit
will detect it and shutdown gas flowing to the burners.
For added protection, a burner enclosure box is installed
over the burner assembly, preventing the flames from
damaging other components. The roll-out limit is
mounted on the burner/manifold assembly and monitors
the burner flame.
WARNING
PERSONAL INJURY HAZARD
To avoid death, personal injury, or property damage,
due to fire or explosion, do not reset the roll-out
protection device. If it opens, the cause must be
investigated by a qualified servicer before any
attempt is made to engage the roll-out protection
device and turn the furnace back on.
Resetting From Lockout
Furnace lockout is characterized by a non-functioning
furnace (circulator blower may be running continuously).
On furnaces with a self-diagnostic electronic control
module, the control diagnostic light will repeat a single
flash followed by a pause.
Furnace lockout results when a furnace is unable to
achieve ignition after three attempts, or when it has lost
flame five times during a single call for heat. When this
occurs, it is possible to reset the control by turning the
thermostat setting below room temperature for one to
twenty seconds then returning the setting to the desired
temperature. The control will automatically reset after
one hour. The control may also be reset after a lockout
by turning off the electrical disconnect switch to the
furnace for one to twenty seconds.
IMPORTANT: If the condition which originally caused
the lockout still exists, the control will return to lockout. If
your furnace frequently locks out, a problem exists which
must be corrected. Contact a qualified servicer.
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General