Combustion Air Requirements; Here's How Your Heating System Works - Bryant 361AAN User's Information Manual

WARNING
!
The unit cabinet must have
an uninterrupted or unbro-
ken electrical ground to
minimize personal injury if
an electrical fault should
occur. This may consist of
electrical wire or approved
conduit when installed in
accordance with existing
electrical codes. Do not use
oil piping as an electrical
ground. Failure to follow
this warning could result in
an electrical shock, fire, or
bodily harm.
WARNING
!
Return air must not be tak-
en from the room in which
the appliance is installed.
All duct connections to the
furnace must be airtight to
avoid a "negative" pres-
sure condition within the
room. Incorrect ductwork
termination and sealing will
create a hazardous condi-
tion which could lead to
bodily harm.
CAUTION
!
The ability to properly per-
form maintenance on this
equipment requires certain
mechanical skills
tools. If you are at all uncer-
tain, contact your dealer for
qualified maintenance and
service.
The operation and care of your unit
is simple and easy. By following
these operating and maintenance
procedures, you can expect to re-
ceive better, longer, and more reli-
able service from your new
appliance.
COMBUSTION AIR
REQUIREMENTS
Combustion air requirements be-
come more important for your new
furnace. More efficient units have
lower flue temperatures and less
natural draft. Especially with new
homes and with older homes that
have been weatherized (storm win-
dows, vinyl siding, additional insu-
lation, etc.) infiltration air may no
longer be enough to supply the nec-
essary combustion air to your fur-
nace. In these cases outside air will
need to be introduced into the fur-
nace location or directly into the
furnace vestibule. This can be ac-
complished by means of louvered
openings, ductwork, or tubing. Your
dealer or service technician has ac-
cess to the necessary air require-
ments specified by the National Fire
Protection Agency.
Some symptoms of a lack of the
proper amount of combustion air
are:
1. Excessive oil burner after drip
and oil fumes.
2. Sooting.
3. Melted oil burner couplings and/
or ignitor/relay control.
4. A condition where air band or air
shutter settings must be more
open than normal to achieve
proper combustion.
5. Lockouts on start-up.
HERE ARE A FEW
"DO'S AND DO NOT'S"
• DO become familiar with the in-
and
structions
• DO use filters. Check them peri-
odically and make sure that they are
clean.
• DO check to see that your home
has adequate insulation, weather-
stripping, caulking, and storm win-
dows. Eliminating infiltration of
outside air and drafts can save up to
40% of your fuel bill.
• DO NOT waste fuel by setting
your thermostat too high. Energy
conservation experts recommend
daytime thermostat setting of 68 ° F,
with a lower setting at night.
• DO NOT turn off the furnace
when you expect to be away for
more than a day. Instead, lower the
thermostat setting by a few degrees.
You can then restore normal com-
fort level quickly and save fuel too.
• DO NOT block registers with fur-
niture.
• DO NOT put a lamp, TV, or radio
near your thermostat. This will
cause it to give a false reading.
HERE'S HOW YOUR
HEATING SYSTEM
WORKS
The furnace operates automatically.
It is controlled by a thermostat
which you set at the temperature
most comfortable to you. When the
inside temperature drops below this
setting, your thermostat starts the
furnace.
When the thermostat calls for heat,
power from the transformer ener-
gizes the fan control board. The fan
control energizes the ignition con-
trol. The ignition control lights the
burner automatically.
The electronic fan control automat-
ically turns on the blower after 30
sec. Fan on control is not adjustable.
The air moved over the heat ex-
changer by the blower is warmed
and passes through the ducts to the
room registers.
When the thermostat is satisfied, the
circuit is de-energized and the pri-
mary control shuts off the burner.
The blower continues to run until
the selectable fan off time period
has expired.
The heat sensing switch performs as
the furnace high temperature limit
switch. If the furnace overheats for
any reason, the limit switch opens,
breaking the circuit to the burner.
The blower motor will be energized
and as the unit cools the limit switch
will close. This relights the burner,
however, unless the overheating
condition is corrected, the furnace
will continue to cycle on limit.
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