Bryant 355MAV User Manual
service and
355MAV
maintenance procedures
DELUXE 4-WAY MULTIPOISE
VARIABLE-CAPACITY DIRECT-VENT
CONDENSING GAS FURNACE
A93040
NOTE: Read the entire instruction manual before starting the
installation.
This symbol → indicates a change since the last issue.
WARNING: ELECTRICAL SHOCK, FIRE, OR
EXPLOSION HAZARD
Failure to follow safety warnings exactly could result in
dangerous operation, serious injury, death, or property
damage.
Improper servicing could result in dangerous operation,
serious injury, death, or property damage.
- Before servicing, disconnect all electrical power to
furnace.
- When servicing controls, label all wires prior to
disconnecting. Reconnect wires correctly.
- Verify proper operation after servicing.
Series I
Cancels: SP05-57 SP05-64
9-04
WARNING: FIRE OR EXPLOSION HAZARD
Failure to follow this warning could cause corrosion of
heat exchanger, fire, personal injury, or death.
Never store anything on, near, or in contact with the
furnace, such as:
1. Spray or aerosol cans, rags, brooms, dust mops,
vacuum cleaners, or other cleaning tools.
2. Soap powders, bleaches, waxes or other cleaning
compounds, plastic or plastic containers, gasoline,
kerosene, cigarette lighter fluid, dry cleaning fluids, or
other volatile fluids.
3. Paint thinners and other painting compounds, paper
bags, or other paper products.
TABLE OF CONTENTS
SAFETY CONSIDERATIONS.....................................................1
GENERAL......................................................................................2
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS........2
CARE AND MAINTENANCE.....................................................3
Cleaning and/or Replacing Air Filter.......................................3
Blower Motor and Wheel Maintenance...................................3
Cleaning Burners ......................................................................5
Cleaning Heat Exchangers........................................................5
Flushing Collector Box and Drainage
System.......................................................................................6
Servicing Hot Surface Igniter...................................................8
Electrical Controls and Wiring.................................................8
Checking Heat Tape Operation
(If Applicable)...........................................................................9
Winterizing................................................................................9
WIRING DIAGRAM...................................................................10
TROUBLESHOOTING ...............................................................10
WARNING: ELECTRICAL SHOCK, FIRE OR
EXPLOSION HAZARD
Failure to follow this warning could result in possible
damage to this equipment, serious personal injury, or
death.
The ability to properly perform maintenance on this
equipment requires certain expertise, mechanical skills,
tools, and equipment. If you do not possess these, do not
attempt to perform any maintenance on this equipment
other than those procedures recommended in the User’s
Manual.
—1—
SAFETY CONSIDERATIONS
Recognize safety information. This is the safety-alert symbol
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. These words are used with the safety-alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability,
or operation.
Installing and servicing heating equipment can be hazardous due to
gas and electrical components. Only trained and qualified service
agency personnel should install, repair, or service heating equipment.
.
These instructions are written as if the furnace is installed in an
GENERAL
upflow application. An upflow furnace application is where the
blower is located below the combustion and controls section of the
furnace, and conditioned air is discharged upward. Since this
furnace can be installed in any of the 4 positions shown in Fig. 2,
you must revise your orientation to component location accordingly.
AIRFLOW
UPFLOW
A98308
Fig. 1—Multipoise Furnace in Upflow Orientation
EFFICIENCY
RATING
CERTIFIED
ISO 9001:2000
CERTIFIED
REGISTERED
Untrained personnel can perform basic maintenance functions
described in User’s Information Manual such as cleaning and
replacing air filters. All other operations must be performed by
trained service personnel. When working on heating equipment,
observe precautions in the literature, on tags, and on labels
attached to or shipped with the unit and other safety precautions
that may apply.
CAUTION: CUT HAZARD
Failure to follow this caution may result in personal
injury.
Be careful of sharp metal edges, etc. Use care and wear
protective clothing, gloves, and safety glasses when
removing parts.
Follow all safety codes including the National Fuel Gas Code
(NFGC) NFPA 54-2002/ANSI Z223.1-2002 in the USA, CSA
B149.1-00 National Standard of Canada, Natural Gas and Propane
Installation Codes (NSCNGPIC) in Canada, and the Installation
Standards, Warm Air Heating and Air Conditioning Systems
(NFPA 90B) ANSI/NFPA 90B. Wear safety glasses and work
gloves. Have a fire extinguisher available during start-up and
adjustment procedures and service calls.
HORIZONTAL
RIGHT
AIRFLOW
HORIZONTAL
LEFT
DOWNFLOW
AIRFLOW
Fig. 2—Multipoise Orientation
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS
→
CAUTION: UNIT DAMAGE HAZARD
Failure to follow this caution may damage furnace
components.
Electrostatic discharge can affect electronic components.
Take precautions during furnace installation and servic-
ing to protect the furnace electronic control. Precautions
will prevent electrostatic discharges from personnel and
hand tools which are held during the procedure. These
precautions will help to avoid exposing the control to
electrostatic discharge by putting the furnace, the control,
and the person at the same electrostatic potential.
1. Disconnect all power to the furnace. DO NOT TOUCH
THE CONTROL OR ANY WIRE CONNECTED TO THE
CONTROL PRIOR TO DISCHARGING YOUR BODY’S
ELECTROSTATIC CHARGE TO GROUND.
2. Firmly touch a clean, unpainted, metal surface of the
furnace chassis which is close to the control. Tools held in
a person’s hand during grounding will be satisfactorily
discharged.
3. After touching the chassis, you may proceed to service the
control or connecting wires as long as you do nothing that
recharges your body with static electricity (for example; DO
NOT move or shuffle your feet, DO NOT touch ungrounded objects, etc.).
4. If you touch ungrounded objects (recharge your body with
static electricity), firmly touch furnace again before touching control or wires.
5. Use this procedure for installed and uninstalled (ungrounded) furnaces.
6. Before removing a new control from its container, discharge your body’s electrostatic charge to ground to protect
the control from damage. If the control is to be installed in
a furnace, follow items 1 through 5 before bringing the
control or yourself into contact with the furnace. Put all
used AND new controls into containers before touching
ungrounded objects.
AIRFLOW
A93041
—2—
WASHABLE
FILTER
FILTER
SUPPORT
FILTER
RETAINER
WASHABLE FILTER OR
DISPOSABLE MEDIA FILTER
IN FILTER CABINET
Fig. 3—Bottom Filter Arrangement
A00232
WASHABLE
FILTER
IN FURNACE
WASHABLE FILTER OR
DISPOSABLE MEDIA
FILTER IN FILTER CABINET
Fig. 4—Filter Installed for Side Inlet
FILTER
RETAINER
A00233
7. An ESD service kit (available from commercial sources)
may also be used to prevent ESD damage.
CARE AND MAINTENANCE
For continuing high performance and to minimize possible furnace
failure, it is essential that maintenance be performed annually.
Consult your local dealer for maintenance and maintenance
contract availability.
WARNING: ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Turn off the gas and electrical supplies to the unit before
performing any maintenance or service. Follow the operating instructions on the label attached to the furnace.
The minimum maintenance that should be performed on this
equipment is as follows:
1. Check and clean or replace air filter each month as needed.
2. Check blower motor and wheel for cleanliness annually.
3. Check electrical connections for tightness and controls for
proper operation each heating season. Service as necessary.
4. Check for proper condensate drainage. Clean as necessary.
5. Check for blockages in combustion-air and vent pipes
annually.
6. Check burners for cleanliness annually.
I. CLEANING AND/OR REPLACING AIR FILTER
The air filter arrangement may vary depending on the application
or orientation.
WARNING: FIRE, CARBON MONOXIDE AND
POISONING HAZARD
Failure to follow this warning could result in fire,
personal injury, or death.
Never operate unit without a filter or with the blower
access panel removed. Dust and lint on internal parts in
furnace can cause a loss of efficiency.
NOTE: If the filter has an airflow direction arrow, the arrow must
point toward the blower.
To clean or replace filters, proceed as follows:
If filter is installed in filter cabinet adjacent to furnace:
1. Turn off electrical supply to furnace.
2. Remove filter cabinet door.
3. Slide filter out of cabinet.
4. If equipped with permanent, washable filter, clean filter by
spraying cold tap water through filter in opposite direction
of airflow. Rinse filter and let dry. Oiling or coating of the
filter is not recommended.
5. If equipped with factory specified disposable media filter,
replace only with a factory specified media filter of the
same size.
6. Slide filter into cabinet.
7. Replace filter cabinet door.
8. Turn on electrical supply to furnace.
If filter is installed in furnace blower compartment:
1. Turn off electrical supply to furnace.
2. Remove main furnace door and blower access panel.
3. Release filter retainer wire. (See Fig. 3 or 4.)
NOTE: Filters shown in Fig. 3 and 4 can be in furnace blower
compartment or in filter cabinet, but not in both.
4. Slide filter out of furnace.
5. Furnaces are equipped with permanent, washable filter(s).
Clean filter by spraying cold tap water through filter in
opposite direction of airflow.
6. Rinse filter and let dry. Oiling or coating filter is not
recommended.
7. Slide filter into furnace.
8. Recapture filter retaining wire.
9. Replace blower access panel and main furnace door.
II. BLOWER MOTOR AND WHEEL MAINTENANCE
To ensure long life, economy, and high efficiency, clean accumulated dirt and grease from blower wheel and motor annually.
The inducer and blower motors are pre-lubricated and require no
additional lubrication. These motors can be identified by the
absence of oil ports on each end of the motor.
—3—
PLUG
CAP
COLLECTOR BOX
DRAIN TUBE (BLUE
& WHITE STRIPED)
COLLECTOR BOX
TUBE (PINK)
COLLECTOR BOX
TUBE (GREEN)
INDUCER HOUSING
(MOLDED) DRAIN
TUBE (BEHIND
COLLECTOR BOX
DRAIN TUBE)
COLLECTOR BOX
DRAIN TUBE (BLUE)
FIELD-INSTALLED
FACTORY-SUPPLIED
DRAIN TUBE
COUPLING (LEFT
DRAIN OPTION)
FIELD-INSTALLED
FACTORY-SUPPLIED
DRAIN TUBE
FIELD-INSTALLED
FACTORY-SUPPLIED
1
⁄2-IN. CPVC STREET
ELBOWS (2) FOR
LEFT DRAIN OPTION
FIELD-INSTALLED
FACTORY-SUPPLIED
COUPLING (RIGHT
CONDENSATE
TRAP
DRAIN TUBE
DRAIN OPTION)
A01030
Fig. 5—Factory-Shipped Upflow Tube
Configuration
(Shown with Blower Access Panel Removed)
The following items should be performed by a qualified service
technician.
Clean blower motor and wheel as follows:
1. Turn off electrical supply to furnace.
2. Remove main furnace door and blower access panel.
3. Disconnect wires.
All factory wires can be left connected, but field thermostat
connections may need to be disconnected depending on
their length and routing.
4. Position control box, transformer, and door switch assembly
to right side of furnace casing.
5. If condensate trap is located in left- or right-hand side of
furnace casing, proceed to item 6. Otherwise remove trap
and tubing as described below (See Fig. 5.):
a. Disconnect field drain connection from condensate trap.
b. Disconnect drain and relief port tubes from condensate
trap.
c. Remove condensate trap from blower shelf.
6. Remove screws securing blower assembly to blower shelf
and slide blower assembly out of furnace. Detach ground
wire and disconnect blower motor harness plugs from
blower motor.
NOTE: Blower wheel is fragile. Use care.
7. Clean blower wheel and motor by using a vacuum with soft
brush attachment. Be careful not to disturb balance weights
(clips) on blower wheel vanes. Do not bend wheel or blades
as balance will be affected.
8. If greasy residue is present on blower wheel, remove wheel
from the blower housing and wash it with an appropriate
degreaser. To remove wheel:
a. Mark blower wheel location on shaft before disassembly
to ensure proper reassembly.
b. Loosen setscrew holding blower wheel on motor shaft.
NOTE: Mark blower mounting arms and blower housing so each
arm is positioned at the same hole location during reassembly.
c. Mark blower wheel orientation and cutoff plate location
to ensure proper reassembly.
d. Remove screws securing cutoff plate and remove cutoff
plate from housing.
e. Remove bolts holding motor mounts to blower housing
and slide motor and mounts out of housing.
f. Remove blower wheel from housing.
g. Clean wheel per instructions on degreaser cleaner. Do
not get degreaser in motor.
9. Reassemble motor and blower wheel by reversing items 8b
through 8f. Ensure wheel is positioned for proper rotation.
Be sure to attach ground wire and reconnect blower harness
plugs to blower motor.
10. Reinstall blower assembly in furnace.
11. Reinstall condensate trap and tubing if previously removed.
a. Reinstall condensate trap in hole in blower shelf.
b. Connect condensate trap drain tubes. See Fig. 5 or tubing
diagram on main furnace door for proper tube location.
(1.) Connect 1 tube (blue or blue and white striped)
from collector box.
(2.) Connect 1 tube (violet or unmarked) from inducer
housing.
(3.) Connect 1 tube (relief port, green or pink) from
collector box.
c. Connect field drain to condensate trap.
NOTE: Ensure tubes are not kinked or pinched, as this will affect
operation.
12. Reinstall control box, transformer, and door switch assembly on blower shelf.
13. Reconnect wires.
a. Refer to furnace wiring diagram and connect thermosta
leads if previously disconnected. (See Fig. 17.)
WARNING: ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Blower access panel door switch opens 115-v power to
furnace control. No component operation can occur.
Caution must be taken when manually closing this switch
for service purposes.
14. Turn on electrical supply. Manually close blower access
panel door switch. Use a piece of tape to hold switch closed.
Check for proper rotation and speed changes between
heating and cooling by jumpering R to G and R to Y/Y2 on
furnace control thermostat terminals. (See Fig. 12.)
15. If furnace is operating properly, release blower access panel
door switch, replace blower access panel, and replace main
furnace door.
—4—
III. CLEANING BURNERS
The following items should be performed by a qualified service
technician. If the burners develop an accumulation of light dirt or
dust, they may be cleaned by using the following procedure:
1. Turn off gas and electrical supplies to furnace.
2. Remove main furnace door.
3. Remove burner box cover.
4. Using backup wrench, disconnect gas supply pipe from
furnace gas valve.
→
CAUTION: ELECTRICAL SHOCK AND UNIT
DAMAGE HAZARD
Failure to follow this caution may result in minor
personal injury or furnace component damage.
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and dangerous
operation.
5. Remove wires from gas valve. Note location for reassembly.
6. Remove burner box pressure tube from gas valve regulator
fitting.
7. Remove screws that secure manifold to burner box. (See
Fig. 6.)
NOTE: Do not remove burner box from cell panel.
8. Remove manifold, orifices, and gas valve as 1 assembly.
9. Remove screws attaching burner assembly in burner box.
10. Remove burner assembly from burner box.
NOTE: All burners are attached to burner bracket and can be
removed as 1 assembly.
11. Clean burners with soft brush and vacuum.
12. Reinstall manifold, orifice, and gas valve assembly in
burner box. Ensure manifold seal grommet is installed
properly and burners fit over orifices.
13. Reconnect wires to gas valve. Refer to furnace wiring
diagram for proper wire location.
CELL
PANEL
MANIFOLD
MOUNTING
SCREWS
14. Reinstall burner box pressure tube to gas valve regulator
fitting.
15. Reinstall gas supply pipe to furnace gas control valve using
backup wrench on gas valve to prevent rotation and
improper orientation.
NOTE: Use propane gas resistant pipe dope to prevent gas leaks.
DO NOT use Teflon tape.
WARNING: FIRE, EXPLOSION, UNIT DAMAGE
HAZARD
Failure to follow this warning could result in property
damage, personal injury, or death.
Gas valve switch MUST be facing forward or tilted
slightly.
16. Replace burner box cover.
17. Turn on gas and electrical supplies to furnace.
18. Check for gas leaks.
WARNING: FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically
for the detection of leaks to check all connections. A fire
or explosion may result causing property damage, personal injury or loss of life.
19. Replace main furnace door.
IV. CLEANING HEAT EXCHANGERS
The following items should be performed by a qualified service
technician.
A. Primary Heat Exchangers
If the heat exchangers get an accumulation of light dirt or dust on
the inside, they may be cleaned by the following procedure:
NOTE: If the heat exchangers get a heavy accumulation of soot
and carbon, both the primary and secondary heat exchangers
should be replaced rather than trying to clean them thoroughly due
to their intricate design. A build-up of soot and carbon indicates
that a problem exists which needs to be corrected, such as
improper adjustment of manifold pressure, insufficient or poor
quality combustion air, improper vent termination, incorrect size
or damaged manifold orifice(s), improper gas, or a restricted heat
exchanger (primary or secondary). Action must be taken to correct
the problem.
1. Turn off gas and electrical supplies to furnace.
2. Remove main furnace door.
MANIFOLD
GAS VALVE
REGULATOR
FITTING
GAS
CONTROL
VALVE
Fig. 6—Burner Box Assembly
GASKET
A02312
—5—
→
CAUTION: ELECTRICAL SHOCK AND UNIT
DAMAGE HAZARD
Failure to follow this caution may result in minor
personal injury or furnace component damage.
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and hazardous
operation.
3. Disconnect wires or connectors to flame rollout switch, gas
valve, igniter, and flame sensor.
4. Disconnect combustion-air intake pipe from intake housing.
5. Remove the pressure switch tube from intake housing.
6. Remove screws attaching intake housing to burner box, and
rotate intake housing away from burner box for removal.
7. Using backup wrench, disconnect gas supply pipe from
furnace gas control valve.
8. Disconnect pressure tubing from gas valve.
9. Remove 2 screws attaching top filler panel and rotate
upwards to gain access to screws attaching burner box to
cell panel.
10. Remove screws attaching burner box to cell panel. (See Fig.
6.)
NOTE: Burner box cover, manifold, gas valve, and burner
assembly should be removed as 1 assembly.
11. Clean heat exchanger openings with a vacuum and a soft
brush. (See Fig. 7.)
NOTE: After cleaning, inspect the heat exchangers to ensure they
are free of all foreign objects that may restrict flow of combustion
products.
PRIMARY HX
INLET OPENINGS
RTV
PAM
A93087
Fig. 8—Combustion-Air Intake Housing Gasket Repair
15. Turn on gas and electrical supplies to furnace.
16. Check furnace operation through 2 complete heat operating
cycles. Look through sight glass in burner enclosure to
check burners. Burner flames should be clear blue, almost
transparent. (See Fig. 10.)
17. Check for gas leaks.
WARNING: FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame. Use a
commercially available soap solution made specifically
for the detection of leaks to check all connections. A fire
or explosion may result causing property damage, personal injury or loss of life.
Fig. 7—Cleaning Inlet Openings of Primary Heat
Exchangers
12. Reverse items 4 through 10 for reassembly.
→
CAUTION: UNIT MAY NOT OPERATE
Failure to attach this ground wire to an adequate casing
ground may cause the furnace control to lock out.
The ground wire from the gas valve MUST be attached to
the burner box attachment screw.
NOTE: Be sure burner box gasket is installed between burner box
and cell panel. (See Fig. 6.) If gasket is damaged, replace it.
NOTE: Inspect combustion-air intake housing. If foamed gasket
was removed, check for any damage. If gasket is damaged in any
way, it must be repaired. To repair, remove damaged gasket
section, apply sealant releasing agent such as PAM cooking spray
or equivalent (must not contain corn or canola oil, aromatic or
halogenated hydrocarbons or inadequate seal may occur) to burner
box and apply a small bead of G.E. RTV 162, G.E. RTV 6702, or
Dow-Corning RTV 738 sealant to edge of combustion-air intake
housing. (See Fig. 8.)
13. Refer to furnace wiring diagram and reconnect wires to
flame rollout switch, gas valve, igniter, and flame sensor.
14. Reconnect pressure switch tubes to gas valve and intake
housing. Refer to tube routing label on main furnace door
for proper tube location. (See Fig. 9.) Be sure tubes are not
kinked.
A96305
18. Replace main furnace door.
B. Secondary Heat Exchangers
NOTE: The condensing side (inside) of the secondary heat
exchangers CANNOT be serviced or inspected. A small number of
bottom outlet openings can be inspected by removing the inducer
assembly. See Flushing Collector Box and Drainage System
section for details on removing inducer assembly.
V. FLUSHING COLLECTOR BOX AND DRAINAGE
SYSTEM
1. Turn off gas and electrical supplies to furnace.
2. Remove main furnace door.
3. Disconnect inducer motor and pressure switch wires or
connectors.
4. Disconnect pressure switch tubes.
5. Disconnect vent pipe from inducer housing outlet by
loosening coupling clamp on inducer outlet.
6. Disconnect drain tube from inducer housing. (See Fig. 8.)
7. Remove inducer housing assembly by removing 4 bolts
attaching assembly to cell panel.
8. Flush inside of collector box with water until discharge
from condensate trap is clean and runs freely.
NOTE: Ensure the drain tube disconnected from the inducer
housing is higher than the collector box opening or water will flow
out tube.
9. Inspect inside area of collector box for any pieces of foreign
materials and remove if present.
—6—
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