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FURNACE COMPONENTS
1. Combustion-- air intake connection to ensure contaminant--
free air (right or left side).
2. Burner sight glass for viewing burner flame.
3. Burner assembly (inside). Operates with energy-- saving
inshot burners and hot surface igniter for safe, dependable
heating.
4. Redundant gas valve. Safe and efficient. Features 1 gas
control with 2 internal shutoff valves. Valve appearance
varies with furnace model.
5. Vent outlet. Uses PVC pipe to carry flue gas from the
furnace’s combustion system (right or left side).
6. Inducer motor. Pulls hot flue gases through the heat
exchangers, maintaining negative pressure for added
safety .
7. Blower access panel safety interlock switch.
8. Air filter and retainer (location in furnace may vary).
9. Condensate drain connection. Collects moisture
condensed from burned gases for disposal into home drain
system. (Location in furnace varies.)
10. Heavy--duty blower. Circulates air across the heat
exchangers to transfer heat into the home.
11. Secondary condensing heat exchanger (inside). Wrings
out more heat through condensation. Constructed with
polypropylene-- laminated steel to ensure durability.
12. Primary serpentine heat exchanger (inside). Stretches fuel
dollars with the S--shaped h eat--flow design. Solid
construction of corrosion--resistant aluminized steel means
reliability.
13. Furnace control board.
14. 3--amp fuse provides electrical and component protection.
15. Light emitting diode (LED) on furnace control board.
Status code light is for diagnosing furnace operation and
service requirements.
16. Pressure switch(es) ensure adequate flow of flue gas
through furnace and out vent system.
17. Rollout switch (manual reset) to prevent overtemperature.
18. Junction box for 115-- v electrical power supply. (May be
located on right or left side)
19. Transformer (24v) behind furnace control board provides
low-- voltage power to furnace control board and
thermostat.
8
10
5
15
14
13
16
9
11
5
2
17
3
4
12
18
6
1
7
19
A02264
Fig. 2 -- Model 58UVB Furnace
(Upflow Only)