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FURNACE COMPONENTS
Combustion-air intake connection to ensure contami-
nant-free air (right or left side).
Burner sight glass for viewing burner flame.
Burner assembly (inside). Operates with energy-saving
inshot burners and hot surface igniter for safe,
dependable heating.
Redundant gas valve. Safe and efficient. Features 1 gas
control with 2 internal shutoff valves. Valve appearance
varies with furnace model.
Vent outlet. Uses PVC pipe to carry flue gas from the fur-
nace’s combustion system (right or left side).
Inducer motor. Pulls hot flue gases through the heat ex-
changers, maintaining negative pressure for added safety.
Blower access panel safety interlock switch.
Air filter and retainer.
Condensate drain connection. Collects moisture con-
densed from burned gases for disposal into home drain
system. (Location in furnace varies.)
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MODELS 58MXA, 58MCA, AND 58MTA
FURNACES (UPFLOW POSITION)
Heavy-duty blower. Circulates air across the heat ex-
changers to transfer heat into the home.
Secondary condensing heat exchanger (inside). Wrings
out more heat through condensation. Constructed with
polypropylene-laminated steel to ensure durability.
Primary serpentine heat exchanger (inside). Stretches fuel
dollars with the S-shaped heat-flow design. Solid con-
struction of corrosion-resistant aluminized steel means re-
liability.
Furnace control board.
3-amp fuse provides electrical and component protection.
Light emitting diode (LED) on furnace control board.
Code light is for diagnosing furnace operation and service
requirements.
Pressure switch(es) ensure adequate flow of flue gas
through furnace and out vent system.
Rollout switch (manual reset) to prevent overtemperature.
Junction box for 115-v electrical power supply. (May be
located on right or left side)
Transformer (24v) behind furnace control board pro-
vides low-voltage power to furnace control board and
thermostat.
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MODEL 58MVP
FURNACE (UPFLOW POSITION)