F96VTN and G96VTN: Installation, Start-up, Operating and Service and Maintenance Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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The electrical ground and polarity for 115-v wiring must be properly
maintained. Refer to Fig. 32 for field wiring information and to Fig. 73
for furnace wiring information.
NOTE: If the polarity is not correct, the STATUS LED on the control
will flashes rapidly (Status Code 10) and prevent the furnace from
heating. The control system also requires an earth ground for proper
operation of the control and flame-sensing electrode.
The 24-v circuit contains an automotive-type, 3-amp. fuse located on the
control. See Fig. 38. Any shorts of the 24-v wiring during installation,
service, or maintenance will cause this fuse to blow. If fuse replacement
is required, use ONLY a 3-amp. fuse. The control LED will display be
off when fuse needs to be replaced.
Troubleshooting
Refer to the service label. See Fig. 71.
The Troubleshooting Guide can be a useful tool in isolating furnace
operation problems. Beginning with the word “Start,” answer each
question and follow the appropriate arrow to the next item. See Fig. 72.
The Guide will help to identify the problem or failed component. After
replacing any component, verify correct operation sequence.
Proper instrumentation is required to service electrical controls. The
control in this furnace is equipped with a Status Code LED
(Light-Emitting Diode) to aid in installation, servicing, and
troubleshooting. Status codes can be viewed at the indicator in blower
door. The Amber furnace control LED is either ON heartbeat, off or a
code composed of 1 or 2 digits. The first digit is the number of short
flashes, the second digit is the number of long flashes.
For an explanation of status codes, refer to service label located on
blower door or Fig. 71, and the troubleshooting guide which can be
obtained from your distributor.
Retrieving Stored Status Codes
The stored status codes will NOT be erased from the control memory,
when 115- or 24-v power is interrupted. The control will store up to the
last 7 Status Codes in order of occurrence.
1. To retrieve status codes, proceed with the following:
NOTE: NO thermostat signal may be present at control, and all
blower-OFF delays must be completed.
a. Leave 115-v power to furnace turned on.
b. Look into blower door indicator for current LED status.
c. Remove blower door.
NOTE: The Status Codes cannot be retrieved by disconnecting the limit
switch. To retrieve Status Codes, follow the procedure below.
2. Turn Setup Switch, SW1-1 “ON.”
3. Manually close blower door switch.
4. Control will flash up to 7 Status Codes.
5. The last Status Code, or 8th Code, will be Code 11.
6. Turn SW1-1 “OFF.”
7. Amber LED will be flashing a heartbeat (bright-dim) which
indicates proper operation.
8. Release blower door switch, install blower door and refer to the
SERVICE label on the blower door for more information.
Component Self-Test
Component Test can ONLY be initiated by performing the following:
1. Remove blower door.
2. Remove the wire from the “R” terminal of the control board.
3. Turn Setup Switch, SW-1-6 “ON.”
4. Manually close blower door switch.
Blower door switch opens 115-v power to control. No component
operation can occur unless switch is closed. Caution must be taken when
manually closing this switch for service purposes.
5. Component Test sequence will function as follows:
a. The furnace control CPU turns the inducer motor ON at
high-heat speed and keeps it ON through step c.
b. After waiting 10 seconds the furnace control CPU turns the hot
surface igniter ON for 15 seconds, then OFF.
c. The furnace control CPU then turns the blower motor BLWM on
at mid-range airflow for 15 seconds, then OFF.
d. After shutting the blower motor OFF the furnace control CPU
switches the inducer to low-heat speed for 10 seconds, then OFF.
NOTE: The EAC terminals are energized when the blower is operating.
After the component test is completed, 1 or more status codes (heartbeat
or 2+5) will flash. See component test section or Service Label (Fig. 71)
for explanation of status codes.
NOTE: To repeat component test, turn setup switch SW1-6 to OFF and
then back ON.
e. Turn setup switch SW1-6 OFF.
6. RELEASE BLOWER DOOR SWITCH, reattach wire to “R”
terminal on furnace control board and replace blower door.
Care and Maintenance
For continuing high performance and to minimize possible furnace
failure, periodic maintenance must be performed on this furnace.
Consult your local dealer about proper frequency of maintenance and the
availability of a maintenance contract.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury, or death.
Blower door switch opens 115-v power to furnace control. No
component operation can occur unless switch is closed. Exercise
caution to avoid electrical shock from exposed electrical components
when manually closing this switch for service purposes.
WARNING
!
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury, death
and/or property damage.
Never store flammable or combustible materials 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. Exposure to these materials could lead to
corrosion of the heat exchangers.
WARNING
!
ELECTRICAL SHOCK AND FIRE HAZARD
Failure to follow this warning could result in personal injury, death,
and/or property damage.
Turn off the gas and electrical supplies to the furnace and install lockout
tag before performing any maintenance or service. Follow the operating
instructions on the label attached to the furnace.
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