3
58MCB
NOTES:
1. The 58MCB Furnaces are for use with natural gas, but can be field-converted for propane gas with a factory-
authorized and listed accessory conversion kit.
2. Component location and configuration may be different than shown above.
Burner sight glass for viewing burner flame.
Burner assembly (inside) operates with energy-
saving, inshot burners and hot surface igniter for
safe, dependable heating.
Combustion-air intake connection to ensure
contaminant-free air (right or left side).
Redundant gas valve. Safe, efficient, gas control.
J
unction box for 115-v electrical power supply.
Vent outlet uses sealed PVC pipe to carry vent
gases from the furnace’s combustion system
(right or left side).
Secondary condensing heat exchanger (inside),
wrings out more heat through condensation of
gases. Constructed with Polypropylene-laminated
steel to ensure durability.
Pressure switch ensures adequate flow of flue
products through furnace and out vent system.
Combustion inducer pulls hot flue gases through
the heat exchangers, maintaining negative
pressure for added safety.
Condensate drain connection collects moisture
condensed during the combustion process.
Heavy-duty blower circulates air across the heat
exchangers to transfer heat into the home.
Air filter and retainer may be used for side or
bottom return application.
Rollout switch (manual reset) to prevent
overtemperature in burner area.
Primary serpentine heat exchanger (inside)
stretches fuel dollars with the S-shaped heat-flow
design. Solid construction of corrosion-resistant
aluminized steel means reliability.
3-amp fuse provides electrical and component
protection.
Light emitting diode (LED) on control center.
Code lights are for diagnosing furnace operation
and service requirements.
Control center.
Blower access panel safety interlock switch.
Transformer (24v) behind control center provides
low-voltage power to furnace control center and
thermostat.
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