Filter
Top Products
3
FURNACE COMPONENTS
Burner sight glass for viewing burner flame.
Burner assembly (inside). Operates with energy-
saving inshot burners and hot surface ignitor for safe,
dependable heating.
Combustion-air intake connection (right or left side).
Redundant 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 polypropylene-laminated steel to
ensure durability.
Pressure switch ensures 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 from burned gases for disposal into home
drain system.
Heavy-duty blower. Circulates air across the heat
exchangers to transfer heat into the home.
Air filter and retainer.
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 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.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
MODEL 345MAV FURNACE
(SHOWN IN UPFLOW POSITION)
2
12
11
6
8
10
9
7
6
4
5
1
2
13
14
18
3
15
16
17
19