3
NOTES:
1. The 58MVB Furnace is built for use with natural gas. The furnace can be converted for propane gas with a factory-authorized and
listed accessory conversion kit.
2. Control location and actual controls 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 2-stage gas valve. Safe, efficient.
Features 1 gas control with 2 internal shutoff
valves.
Junction box for 115-v electrical power supply.
Vent outlet. Uses 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.
Constructed with patented Polypropylene-
laminated steel to ensure durability.
Pressure switches ensure adequate flow of flue
products through furnace and out vent system.
Inducer motor. Pulls hot flue gases through the
heat exchangers, maintaining negative pressure
for added safety.
Condensate drain connection. Collects moisture
condensed during 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
return application.
Rollout switch (manual reset) to prevent
overtemperature.
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 diodes (LEDs) on control center.
Code lights are for diagnosing furnace operation
and service requirements.
ComfortHeat™ 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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A02287
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