37
Burner
Assembly
Finish
Flange
Roll-Out
Switch
Transformer
Motor Control Board
Blower Assembly
Flame Sensor
Motor Choke
(C & D cabinets only)
Motor Control Box
Blower Door Switch
Inducer Assembly
Pressure Switches
Inducer Limit Switch
Furnace Control Board
Igniter
Gas Valve
Gas Manifold
Main Air Limit Switch
UPFLOW / HORIZONTAL FURNACE (*MQ SERIES)
The descriptions below are various functional components that affect the operation and shutting down of this furnace.
The Blower switch prevents furnace operation when blower is not operational.
Condensate Drain Switch - The condensate drain switch will shut down the furnace if the condensate drain from
the Collector Pan becomes clogged.
gas valve and initiate the shutdown cycle.
opens and regulates the gas pressure in the manifold.
The inducer assembly vents products of combustion to the outside.
Pressure Switch - Pressure switches verify that the inducer is drawing the combustion gases through the heat
will shut the furnace down.
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