Carrier 58MVB - Manual (Page 10)

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Check the combustion-air intake and vent pipe 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. Accumu-
lations on the main burners can result in firing out of normal
sequence. This delayed ignition 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 the 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
portions of pipes must slope downward 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 the 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 transpar-
ent. (See Fig. 41.) If you observe a suspected malfunction,
or the burner flames are not clear blue, call your dealer.
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HEADING SOUTH FOR THE WINTER?
DON’T FORGET YOUR FURNACE!
Since the furnace uses a condensing heat exchanger, some water
will accumulate 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. Follow 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.)
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5. Connect field-supplied 1/2-in. ID tube to upper inducer
housing drain connection.
CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution may result in minor
property damage.
If your furnace makes an especially loud noise
when the main burners light, shut down your fur-
nace and call your dealer.
WARNING
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in per-
sonal injury or death.
If dirt, rust, soot, or scale accumulations are found,
call your dealer. Do not operate your furnace.
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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 protection 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 antifreeze
coolant or equivalent). Failure of plastic components
may occur.
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