Bryant 350AAV - Manual (Page 10)

10
Also check the combustion-air intake
and vent pipes on the outside of your
home for blockage.
When dirt, soot, scale, or rust is
allowed to build up, your furnace can
suffer a loss of efficiency and perform
improperly. Accumulations on the
main burners can result in firing out of
normal sequence. This delayed igni-
tion creates an alarmingly loud sound.
To inspect the combustion area and
vent system, you will need a flashlight.
Refer to Fig. 3 or 4, and proceed as
follows:
1. Turn off gas and electrical supplies
to the furnace and remove
the main furnace door. (See Fig.
11, 12, and 13.)
2. Remove burner enclosure front.
(See Fig. 39 or 40.)
Inspect the gas burners, igniter
area, and remainder of furnace for dirt,
rust, soot, or scale.
3. Inspect the combustion-air and
vent PVC pipes for sags, holes,
cracks, water leaks, blockage or
disconnections. Horizontal por-
tions of pipes must slope down-
ward toward furnace.
39
40
4. Reinstall burner enclosure front.
5. If your furnace is free of the above
conditions, replace main furnace
door and turn on electrical and gas
supplies to your furnace.
(See Fig. 18, 19, and 20.)
6. Start the furnace and observe its
operation. Watch the burner flames
to see if they are clear blue, almost
transparent. (See Fig. 41.) If you
observe a suspected malfunction,
or the burner flames are not clear
blue, call your dealer.
41
HEADING SOUTH FOR THE
WINTER?
DON’T FORGET YOUR
FURNACE!
Since the furnace uses a condensing
heat exchanger, some water will accu-
mulate in the unit as a result of the heat
transfer process. Therefore, once it
has been operated, it cannot be turned
off and left off for an extended period
of time when temperatures will reach
32°F or lower unless winterized. Fol-
low these procedures to winterize your
furnace:
1. Obtain propylene glycol (RV/
swimming pool antifreeze or
equivalent).
2. Turn off electrical supply to the
furnace. (See Fig. 22.)
3. Remove main furnace door.
(See Fig. 25.)
4. Remove upper inducer housing
drain connection cap.
(See Fig. 42.)
5. Connect field-supplied 1/2-in.
ID tube to upper inducer housing
drain connection.
6. Insert field-supplied funnel into
tube.
CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution
may result in minor property
damage.
If your furnace makes an espe-
cially loud noise when the
main burners light, shut down
your furnace and call your
dealer.
WARNING
CARBON MONOXIDE
POISONING HAZARD
Failure to follow this warning
could result in personal injury
or death.
If dirt, rust, soot, or scale accu-
mulations are found, call your
dealer. Do not operate your
furnace.
!
!
UPFLOW
DOWNFLOW
CAUTION
UNIT AND PROPERTY
DAMAGE HAZARD
Failure to follow this caution
may result in damage to the
furnace and other property
damage.
If the furnace is installed in an
unconditioned space where
the ambient temperatures may
be 32°F or lower, freeze protec-
tion measures must be taken
to prevent minor property or
product damage.
CAUTION
UNIT COMPONENT DAMAGE
HAZARD
Failure to follow this caution
may result in damage to the
furnace and other property
damage.
Do not use ethylene glycol
(Prestone II anti-freeze coolant
or equivalent). Failure of plas-
tic components may occur.
!
!