Furnace Components - Carrier 58MVB Owner's Manual

FURNACE COMPONENTS
(Furnace shown in upflow position; may be used in downflow or
horizontal orientation or applications.
17
3
15
13
7
19
Single Stage Furnace
A08315
4
18
6
5
15
14
13
7
19
10
Two-Stage Furnace
A08316
1. Combustion-air intake connection (right or left side).
2. Burner sight glass for viewing burner flame.
3. Burner assembly (inside), operates with energy-saving, in-
shot burners and hot surface igniter for safe, dependable
heating.
4. Redundant gas valve. Safe and efficient. Features 1 gas con-
trol with 2 internal shutoff valves.
5. Vent outlet, uses PVC pipe to carry flue gas from the fur-
nace's combustion system (right or left side).
6. Inducer motor. Pulls hot flue gases through the heat ex-
changers, maintaining negative pressure for added safety.
7. Blower access panel safety interlock switch.
8. Air filter (sold separately on some models) 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 ex-
changers to transfer heat into the home.
11. Secondary condensing heat exchanger (inside). Wrings out
more heat through condensation. Constructed with polypro-
pylene-laminated steel to ensure durability.
12. Primary serpentine heat exchanger (inside), stretches fuel
dollars with the S-shaped heat-flow design. Solid construc-
tion of corrosion-resistant aluminized steel means reliabil-
ity.
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 over temperature.
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.