17
VENT PRESSURE SWITCH
This heater uses a vent pressure switch that prevents the heater from operating should any
portion of the vent system become restricted or a venter failure occur. To check this switch,
place the heater in operation and remove the hose from the switch. The gas burners will extin-
guish. Replacing the hose will allow the heater to operate normally.
FLAME ROLL-OUT SWITCH
This heater is equipped with a flame roll-out switch(s). This manually resetable switch is a disc
type and is non-adjustable. This switch is designed to shut down the burner gas if there are
flames outside the heat exchanger. Should this switch function, contact a qualified service per-
son to determine the cause of function before resetting. To reset this switch press the button
on top of the switch after the heater has cooled. To test the operation, place the heater in op-
eration and place an open flame on the flat surface of the switch. The switch should function to
shut down the
burner gas
. Wait until the heater has cooled sufficiently before resetting
the switch.
FLAME SENSOR
The ignition is provided by an electronic ignition system. The burner flames will become extin-
guished if the flame sensor fails to detect the presence of flame. To test, disconnect the flame
sensor wire before placing the heater in operation. The electronic ignition device should at-
tempt the burners. However, the burners should shut off after a few seconds of operation. Dis-
connect the electrical supply to the heater, reinstall the disconnected sensor wire and reset the
power supply to restore the heater to its normal operation.
BLOWER DOOR INTERLOCK SWITCH
The purpose of the switch is to disconnect electrical power to the heater should the blower
door become dislodged, removed, or not properly reinstalled. ALLOWING THE HEATER TO
OPERATE WITHOUT THE BLOWER DOOR BEING SECURELY IN PLACE CAN CAUSE
COMBUSTION PRODUCTS TO BECOME CIRCULATED THROUGHOUT THE LIVING AREA
WHICH CAN CAUSE SERIOUS ILLNESS OR
CARBON MONOXIDE
POISONING. To test
the operation of this switch, place the heater in operation and remove the blower access door.
The burner flames should become extinguished and the venter and circulating air blowers
should both stop. To restore the unit to normal operation, shut off the electrical power to the
unit, replace the blower access door and restore the electrical power.
INTEGRATED FAN / IGNITION CONTROL
This heater is equipped with a combination ignition module and fan control. The ignition source
is an electronic device. This device ignites the burners upon a call for heat. It also controls the
venter blower and the various speed selections and timings of the circulating air blower. This
control is located in the circulating air blower compartment.
Upon a demand for heat the venter is energized. After a short purge, the electronic ignition de-
vice is energized. The burners are ignited, and after a slight delay, are proven.
The circulating air blower is energized approximately thirty (30) seconds after the burners are
ignited. The circulating air blower is de-energized by a field selectable fan off timer.
THIS CONTROL IS NOT FIELD REPAIRABLE.
Summary of Contents for GMP Series
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