USER’S INFORMATION MANUAL
MODELS 373LAV, 376CAV
DOWNFLOW/HORIZONTAL and
383KAV, 395CAV UPFLOW GAS FURNACE
NOTE TO INSTALLER:
This manual must be left with the
equipment user.
!
WARNING: If the information in this man-
ual is not followed exactly, a fire or explosion may
result causing property damage, personal injury
or loss of life.
— Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance.
Upflow
— WHAT TO DO IF YOU SMELL GAS:
— Do not try to light any appliance.
— Do not touch any electrical switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the
fire department.
— Installation and service must be performed by a
qualified installer, service agency or the gas
supplier.
Do not use this furnace if any part has been under
water. Immediately call a qualified service technician
to inspect the furnace and to replace any part of the
control system and gas control which has been under
water.
Downflow/
Horizontal
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DOWNFLOW/HORIZONTAL
FURNACE COMPONENTS
1
1
Manual-Reset Auxiliary Limit Switch
(When Used)
2
3
4
Blower and Blower Motor
Relief Box
2
Gas Valve Control Knob or Electric Switch
(On/Off)
8
5
6
Gas Valve
9
Gas Burner
7
Rating Plate
3
8
Blower Door Safety Switch
Blocked Vent Safeguard Tube and Switch
Gas Manifold
9
10
11
4
10
11
12
13
5
Manual Reset Limit Switch (2)
Hot Surface Ignitor
Flame Sensor
6
7
12
13
4
many products around the home, such
as: water softener salts, laundry
bleaches, detergents, adhesives, paints,
varnishes, paint strippers, waxes, and
plastics.
nace is left unattended for an extended
period of time, have it checked periodi-
cally for proper operation. This precau-
tion will prevent problems associated
with no heat, such as frozen water pipes,
etc. See “BeforeYou Request a Service
Call’’ section in this manual.
IMPORTANT FACTS
Your furnace must have adequate air-
flow for efficient combustion and safe
ventilation. Do not enclose it in an
airtight room or “seal’’ it behind solid
doors. To minimize the possibility of
serious personal injury, fire, damage
to your furnace, or improper operation;
carefully follow these safety rules:
Make sure the combustion air for your
furnace does not contain any of these
compounds. During remodeling be
sure the combustion air is fresh and un-
contaminated. If these compounds are
burned in your furnace, the heat ex-
changers and metal vent system may
deteriorate.
SAFETY
CONSIDERATIONS
Installing and servicing heating
equipment can be hazardous due to
gas and electrical components. Only
trained and qualified personnel should
install, repair, or service heating
equipment.
• Keep the area around your furnace
freeofcombustiblematerials,gasoline,
and other flammable liquids and
vapors.
• A furnace installed in the attic or
other insulated space must be kept free
and clear of the insulating material.
Examine the furnace area when install-
ing the furnace or adding more insula-
tion. Some materials may be
Untrained personnel can perform basic
maintenance functions such as clean-
ing and replacing air filters. All other
operations must be performed by
trained service personnel. Observe
safety precautions in this manual, on
tags, and on labels attached to the fur-
nace and other safety precautions that
may apply.
combustible.
NOTE: Do not use this furnace if any
part has been under water. Immediately
call a qualified service technician to in-
spect the furnace and to replace any
part of the control system and any gas
control which has been under water.
Recognize safety information: This is
5
NOTE: The qualified installer or
agency must use only factory-
authorized re-placement parts, kits,
and accessories when modifying or
repairing this product.
!
the safety-alert symbol
. When you
• Do not cover the furnace, store trash
or debris near it, or in any way block
the flow of fresh air to the unit.
see this symbol on the furnace and in
instructions or manuals, be alert to the
potential for personal injury.
• Combustion air must be clean and
uncontaminated with chlorine or fluo-
rine. These compounds are present in
Understand the signal words—DAN-
GER, WARNING, and CAUTION.
These words are used with the
This furnace contains safety devices
which must be manually reset. If the fur-
3
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safety-alert symbol. DANGER identi-
fiesthemostserioushazardswhichwill
result in severe personal injury or
death. WARNING signifies hazards
whichcouldresultinpersonalinjuryor
death. CAUTION is used to identify
unsafe practices which would result in
minor personal injury or product and
property damage.
• CHECK AIR FILTER: Before at-
tempting to start your furnace, be sure
the furnace filter is clean and in place.
(See the maintenance section of this
manual.) Then proceed as follows:
®
STARTING YOUR
FURNACE
11
4. Remove the furnace access door(s).
Instead of a continuously burning pilot
flame, your furnace uses an automatic
hot surface ignition system to light the
burners each time the thermostat sig-
nals the furnace to start. Follow these
important safeguards:
a. Downflow/Horizontal—remove
blower door after removing
2 screws first, then remove the
control door. (See Fig. 10.)
7
b. Upflow—remove control door.
STEPS FOR STARTING
YOUR FURNACE
1. Set your room thermostat to the
lowest temperature setting. (See
Fig. 7.)
2. Close the external manual gas
valve. (See Fig. 8.)
3. Turn OFF the electrical supply to
your furnace. (See Fig. 9.)
(See Fig. 11.)
• Never attempt to manually light the
burners with a match or other source of
flame.
5. The gas valve will have EITHER a
control knob or control switch to
turn off and on. Turn the control
knob or switch on the gas valve to
the OFF position and wait 5 min-
utes. (See Fig. 12 or 13.)
6. After waiting 5 minutes, turn the
control knob or switch on the gas
valve to the ON position. (See Fig.
14 or 15.)
7. Replace the access door(s). See
Fig. 16 for upflow and Fig. 17 for
downflow. Replace control door
first on downflow furnaces. Then
replace blower door (secure with
2 screws).
6
• Read and follow the operating in-
structionsonthefurnace, especiallythe
item that reads as follows:
8. Turn ON the electrical supply to
the furnace. (See Fig. 18.)
Wait 5 minutes to clear out any gas.
Then smell for gas, including near the
floor. If you smell gas, STOP! Follow
“B’’ in the safety information above on
this label. If you don’t smell gas, go to
the next step.
8
9. Open the external manual gas
valve. (See Fig. 19.)
10. Set the room thermostat to a tem-
perature slightly above the room
temperature. This will automati-
cally signal the furnace to start. The
inducer motor will start, and the hot
surface ignitor will energize. When
hot, the ignitor will have an orange
glow.
• If a suspected malfunction occurs
with your gas control system, such as
the burners do not light when they
should, refer to the shutdown proce-
dures on the furnace, or in the next sec-
tion, to turn off your system, then call
your dealer as soon as possible.
9
!
WARNING
Should overheating occur, or
the gas valve fail to shut off the
gas supply, turn off the manual
gas valve (See Fig. 8) to the fur-
nace BEFORE turning off the
electrical supply. A failure to
follow this warning could re-
sult in a fire or explosion, and
personal injury or death.
10
12
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11. After 15 to 70 sec, the gas valve
permits gas to flow to the main
burners where it is ignited. Hot
flames begin to warm the furnace’s
heat exchanger. After a time delay
of approximately 45 sec, the fur-
nace blower is switched on.
1
M
3
O
P
F
F
2
C
OR
ON
NOTE: If the main burners fail to ig-
nite, the furnace control system will go
through 3 more ignition cycles. Then, if
burners fail to ignite, the system will
lockout. Iflockoutoccurs, ortheblower
doesn’t come on—shut down your fur-
nace and call your dealer for service.
13
12. Set your thermostat to the tempera-
ture that satisfies your comfort re-
quirements. SUGGESTION:
Setting the thermostat back a few
degrees—andcompensatingforthe
difference with warmer clothing—
can make a big difference in your
fuel consumption on extremely
cold days. The few degrees at the
top of your thermostat “comfort
level’’ are the most costly degrees
to obtain.
ON
14
When the room temperature drops
below the temperature selected on
the thermostat, the furnace will be
switched on automatically. When the
room temperature reaches the degree
selected on the thermostat, the furnace
will be switched off automatically.
1
3
2
M
O
P
F
F
C
OR
ON
Some thermostats have a “fan’’ mode
with 2 selections:AUTO or ON. When
set on AUTO, the furnace blower cy-
cles on and off, controlled by the ther-
mostat. In the ON position, the furnace
blower runs continuously except for a
45-sec delay at the “call for heat.’’ This
keeps the temperature level in your
home more evenly balanced. It also
continuously filters the indoor air.
15
SHUTTING DOWN
YOUR FURNACE
Should you ever suspect a malfunction
in your furnace, you will need to turn
the furnace off. The following proce-
dures must be followed:
17
16
1. Set your room thermostat to
the lowest temperature setting.
(See Fig. 20.)
2. Close the external manual gas
valve. (See Fig. 8 on page 4.)
3. Turn OFF the electrical supply to
your furnace. (See Fig. 21.)
4. Remove the control access door on
your furnace. (See Fig. 10 or 11.)
On upflow furnaces, removing the
blower access door is not required.
19
18
5
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furnace size with the proper filter size.
5. Turn the control knob or switch on
the gas valve to the OFF position.
(See Fig. 22 or 23.)
PERFORMING ROUTINE
MAINTENANCE
!
CAUTION
With the proper maintenance and care,
yourfurnacewilloperateeconomically
and dependably. Basic maintenance,
which can easily be accomplished by
someone who follows the directions, is
found on this and the following pages.
However, before beginning mainte-
nance, follow these safety precautions:
Never operate your furnace
without a filter in place. Doing
so may damage the furnace
blower motor. An accumula-
tion of dust and lint on internal
parts of your furnace can
cause a loss of efficiency.
®
The air filter for upflow furnaces is nor-
mally located in the blower compart-
ment (See Fig. 03.) or in the factory-
supplier filter cabinet attached to the
side or bottom of the blower cabinet.
Filters for the downflow furnaces are
normally located in the return-air ple-
num above the blower. If air filter has
been installed in another location, con-
tact your dealer for instructions. To in-
spect, clean, and/or replace the air
filter(s). follow these steps:
!
WARNING
Turn off electrical power sup-
ply to your furnace before re-
moving the access doors to
service or perform mainte-
nance. A failure to follow this
warning could result in per-
sonal injury or death.
20
!
CAUTION
Although special care has
been taken to minimize sharp
edges, be extremely careful
when handling parts or reach-
ing into the furnace.
UPFLOW FURNACES ONLY:
1. Turn off electrical supply to fur-
nace. (See Fig. 9)
2. Remove door/access panel.
21
• AIR FILTER(S) LOCATED IN
BLOWER COMPARTMENT
FILTERING OUT
TROUBLE
Remove control and blower access
doors. (See Fig. 10 and 11)
A dirty filter will cause excessive stress
on the furnace blower motor and can
cause it to overheat and automatically
shut down. The furnace filter should be
checkedevery3or4weeksandcleaned
if necessary. If installed with factory
specified disposable media filter, check
orreplacefilterbefore eachheatingand
cooling season. Replace disposable
media filter at least once a year.
• AIR FILTER LOCATED IN FIL-
TER CABINET
Remove filter cabinet door (See
Fig. 30 and 31)
NOTE: It will be necessary to remove 1
thumbscrew
If installed with factory specified dis-
posable media filter, check or replace
filter before each heating and cooling
22
1
M
3
O
F
F
P
2
24
C
OR
ON
23
season. Replacedisposablemediafilter
at least once a year.
6. Replace the control access door.
(See Fig. 16 or 17.)
If your furnace filter needs replacing, be
sure to use the same size and type of fil-
ter that was originally supplied. Use the
Furnace Filter Table and compare your
7. If the furnace is being shut down
because of a malfunction, call your
dealer as soon as possible.
25
6
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3. Remove air filter from furnace.
• AIR FILTER LOCATED IN
be required in some models. The pro-
cedure listed above may be used to
remove side filters.
AIR FILTER LOCATED IN FILTER CABINET
BLOWER COMPARTMENT:
FILTER
CABINET
HEIGHT (IN)
FILTER SIZE
(IN.)
a) Slide filter retainer sideways un-
FILTERTYPE
til it is free of latch. (See Fig. 24)
(1) 16 x 25 x 1* or
(1) 16 x 25 x 4-5/16
Cleanable
Disposable
16
20
24
b) Gently remove air filter and
carefully turn the dirty side up
(if dirty) to avoid spilling dirt
from the filter. (see Fig. 25)
(1) 20 x 25 x 1* or
(1) 20 x 25 x 4-5/16
Cleanable
Disposable
(1) 24 x 25 x 1* or
(1) 24 x 25 x 4-5/16
Cleanable
Disposable
• AIR FILTER LOCATED IN FIL-
TER CABINET:
DOWNFLOW/HORIZONTAL
FURNACE FILTER TABLE
FURNACE
a) Slide air filter out of furnace.
Keep dirty side up (if dirty) to
avoid spilling dirt. (See Fig. 32
and 33)
27
28
CASING
WIDTH
FILTER
TYPE
FILTER SIZE
(2)16x20x1*
(2)16x20x1*
(2)16x20x1*
(2) 16x20x1*
DOWNFLOW/HORIZONTAL
FURNACES ONLY:
14-3/16
17-1/2
21
Cleanable
Cleanable
Cleanable
Cleanable
Two filters are located in the return-air
plenum above the blower (above line-
of-sight) resting in the V-shaped chan-
nel on top of the furnace. (See Fig. 27.)
24-1/2
* Factory provided with the furnace.
Filters may be field modified by cutting filter
material and support rods (3) in filters. Alternate
sizes and additional filters may be ordered from
your dealer.
1. Turn OFF electrical supply to the
furnace. (See Fig. 21.)
2. Remove blower access door after
removing 2 screws.
!
CAUTION
3. Remove the left-side filter by tip-
ping the filter toward the center—
raise it from theV-shaped channel in
which it rests. (See Fig. 27 and 28.)
4. Lower filter down along side of the
blower and remove from the furnace.
5. To remove the second filter, lift
fromV-shaped channel and remove
the same way as left side filter.
6. Inspect the filters. If torn, replace
the filter.
7. Wash the filters (if dirty) in a sink,
bathtub, or outside with a garden
hose. Always use cold tap water. A
mild liquid detergent may be used
if necessary. Spray water through
the filter in the opposite direction of
airflow. Allow filter to dry.
Use care when cutting support
rods in filters to protect
against flying pieces and
sharp rod ends. Wear safety
glasses, gloves, and appropri-
ate protective clothing. Failure
to follow this caution could re-
sult in personal injury.
26
4. Inspect the filter. If torn, replace it.
NOTE: If washable filter that was
shipped with the furnace has been re-
placed by:
a) Factory specified disposable
media filter – Do not clean. If
dirty, replace only with media
filter having the same part num-
ber and size. Install with airflow
direction arrow pointing to-
wards blower.
b) Electronic air cleaner (EAC) –
Refer to EAC owner’s Manual
for maintenance information.
COMBUSTION AREA
AND VENT SYSTEM
Inspect the combustion area and vent
system before each heating season. An
accumulation of dirt, soot, or rust can
mean a loss of efficiency and improper
performance. Buildups on the main
burners can cause faulty firing. This
“delayed ignition’’ is characterized by
an alarmingly loud sound. If your fur-
nace makes a loud noise when the main
burners are ignited, shut down the fur-
nace—call your servicing dealer.
5. Wash filter (if dirty) in sink, bath-
tub, or outside with a garden hose.
Always use cold tap water. A mild
liquid detergent may be used if nec-
essary. Spray water through filter in
the opposite direction of airflow.
Allow filter to dry.
8. Reinstall clean filters.
9. Replace blower door (secure with 2
screws) and turn ON electrical
power to your furnace.
UPFLOW FURNACE
AIR FILTER TABLE
Use your flashlight and follow these
steps for inspecting the combustion
area and vent system of your furnace:
6. Reinstall clean air filter
7. Reinstall filter retainer (for blower
AIR FILTER LOCATED IN BLOWER COMPARTMENT
FILTER SIZE (IN.)
FURNACE
compartment locations only)
CASING
WIDTH Side Return
Bottom
Return
FILTER
TYPE
1. Turn off the electrical supply to the
furnace and remove the access
8. Replace control and blower doors
(See Fig. 16 and 17) or filter cabinet
door (Fig. 34 and 35)
9. Turn on electrical supply to furnace
(see Fig 18).
14-3/16
17-1/2
21
(1)16x25x1* (1)14x25x1*
Cleanable
doors. (See Fig. 9 and 10, or 11.)
(1)16x25x1* (1)16x25x1** Cleanable
2. Carefully inspect the gas burner
(see Fig. 29) for dirt, rust, or scale.
Then inspect the relief box, flue
(1)16x25x1* (1)20x25x1*
(1 or 2)
Cleanable
24-1/2
16x25x1 (1)24x25x1** Cleanable
NOTE: For upflow models only—if
side return ducts are used, 2 filters may
7
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connection area, and the vent pipe
for rust.
29
NOTE: If dirt, rust, soot, or scale accu-
mulations are found, call your servic-
ing dealer. DO NOT OPERATE THE
FURNACE.
34
3. Inspect the vent pipe for a sag,
holes, or a disconnection. A hori-
zontal vent pipe must slope up-
ward. If rusty joints or seams, or
signs of water leakages are found
call your dealer for service.
31
!
WARNING
If holes are found—or if the
vent pipe is obstructed or is
not connected—toxic fumes
can escape into your home. DO
NOT OPERATE YOUR FUR-
NACE. Call your dealer for ser-
vice. A failure to follow this
warning could result in per-
sonal injury or death.
35
4. Replace the access doors and re-
store electrical power to the fur-
nace. Be sure bottom door flange is
inside of the furnace casing. (See
Fig. 16, 17, and 26.)
5. Start the furnace and observe its
operation. If possible, watch the
burner flames. Are they burning
bright blue? If not (or if you suspect
some other malfunction), call your
servicing dealer.
BEFOREYOU REQUEST
A “SERVICE CALL”
BEFORE YOU CALL FOR
SERVICE, CHECK FOR
32
SEVERAL EASILY SOLVED
PROBLEMS:
• Check for sufficient airflow. Check the
air filter for dirt. Check for blocked re-
turn-air or supply-air grilles. Be sure they
areopenandunobstructed.Ifthisisn’tthe
cause, call your servicing dealer.
If your furnace isn’t operating at all,
check the following list for easily
solved problems:
• Is your thermostat set above room
temperature? Is the HEAT mode
selected?
• Is the electrical power supply switch
ON? Is the blower access door firmly in
place? Are any fuses blown? (There is
a fuse on the furnace control board.)
Has a circuit breaker tripped?
33
• Is the manual shutoff valve in the gas
supply pipe leading to the furnace
30
8
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open? Does the lever point in the same
direction that the pipe runs (open)? Or
is it at right angles (closed)?
will shut off the furnace. Reset the
switch(es) by pushing the button on the
switch. If the switch trips a second
time, turn off the furnace and call for
service.
4. Inspection, cleaning, and lubrica-
tion (when required) of the blower
motor and wheel.
NOTE: Refer to the unit Service Proce-
dures for blower motor oiling informa-
tion. When required, the motor
must be oiled by a qualified service
technician.
NOTE: Before proceeding with the
next checks, turn OFF the electrical
power supply to the furnace. Remove
the access doors.
• If your furnace still fails to operate, call
your servicing dealer for troubleshooting
and repairs. Tell your dealer the model
and serial numbers for your furnace.
(You should have them recorded on page
12 of this booklet.) By knowing exactly
which furnace you have, the dealer may
be able to offer suggestions over the
phone, or save valuable time through
knowledgeable preparation for the ser-
vice call.
• Is the control knob or switch on the
gas valve turned to the ON position? If
this or the preceding check shows an
interruption in the gas supply, make
sure the gas has not been shut off for
safety reasons. If nothing else seems to
be wrong, follow the startup proce-
dures found on pages 4 and 5 of this
booklet.
5. Routine inspection and cleaning/
replacement of the air filter.
6. Inspection of all supply- and
return-air ducts for obstructions,
air leaks, and insulation. Any prob-
lems found should be resolved at
this time.
7. Inspection of furnace installation
for proper support and any obvi-
ous deterioration of the furnace.
The support must be sound and
without sags, gaps, cracks, etc.,
around the furnace base so as to
provide an air seal between the
support and furnace.
• If for some reason the vent is
blocked, thedraftsafeguardswitchwill
shut off the furnace. Reset the switch
by pushing the button located on top of
the switch. (See page 2 or 3 for switch
location.)
REGULAR DEALER
MAINTENANCE
In addition to the type of routine main-
tenance you might be willing to do,
your furnace should be inspected
regularly by a properly trained service
technician. An annual inspection (or
biennial inspection, at least) should
include the following:
If the switch trips a second time, turn
off the furnace and call for service.
8. A check for loose connections
attaching individual components.
Inspection of all electrical wiring
and their connections.
DOWNFLOW/HORIZONTAL
ONLY—Check the manual-reset aux-
iliary limit switch (when used) located
on the blower housing. If the blower
motor fails, this switch will shut off the
furnace. Reset it by pushing the button
on the switch. If it trips again, turn off
the furnace and call for service.
9. Operational check of the furnace
itself to determine working condi-
tion. Repair or adjustment should
be made at this time.
1. Inspection of all flue product pas-
sages—including the burners, heat
exchanger, relief box, and vent
pipe.
2. Inspection of all combustion
and ventilation air passages and
openings.
3. Close check of all gas pipes
leading to (and inside of) your
furnace.
Ask your servicing dealer for
further details about an economical
service contract that covers seasonal
inspections.
• Check the manual-reset limit
switch(es) located near the burners. If
the furnace has experienced a high-
temperature condition, due to inade-
quate combustion air, these switches
9
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INSTALLATION DATA
Date Installed
Dealer Name
Address
SPLIT-SYSTEM
OUTDOOR UNIT:
Product No.
Model No.
City
Serial No.
State
Zip
INDOOR COIL:
Product No.
Model No.
Telephone
FURNACE
Product No.
Model No.
Serial No.
Serial No.
Cancels:OM04-33
PRINTED IN U.S.A. Catalog No. 5337-309
OM04-35
10-00
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© 2000 Bryant Heating & Cooling Systems, 7310 W. Morris St. Indpls., IN 46231
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