9
5. Connect field-supplied 1/2-in.
ID tube to upper inducer housing
drain connection.
29
30
6. Insert field-supplied funnel into
tube.
7. Pour 1 quart of antifreeze into
funnel/tube. Antifreeze should run
through inducer housing, overfill
condensate trap, and flow into
open field drain. (See Fig. 30.)
8. Remove funnel and tube from
inducer housing and replace drain
connection cap and clamp.
9. Replace main furnace door.
(See Fig. 25.)
10. Propylene glycol need not be
removed before restarting furnace.
A CHECK-UP
CHECKLIST
Your furnace represents an important
investment in your family’s comfort
and your home’s value. To keep it
performing properly and to prevent
future problems, have a trained service
specialist give your furnace a profes-
sional check-up annually. The follow-
ing checklist can be used as a guideline
to proper service:
• Inspect all flue gas passages, burn-
ers, heat exchangers, coupling
box(es), and inducer assembly.
• Inspect all combustion-air and vent
piping inside structure and vent pipe
termination outside the structure.
• Check gas pipes leading to and
inside of your furnace for leaks.
• Inspect and clean the blower motor
and wheel.
NOTE
: The inducer and blower motors
are pre-lubricated and require no addi-
tional lubrication. These motors can be
identified by the absence of oil ports on
each end of the motor.
• Inspect and change or clean air fil-
ter(s) if necessary.
• Inspect all supply- and return-air
ducts for obstructions, air leaks, and
insulation. Remedy any problem when
necessary.
• Inspect the return-air duct connec-
tion(s) at the furnace to ensure it is
physically sound, sealed to the furnace
casing, and terminates outside the
space containing the furnace.
• Inspect electrical wiring, connec-
tions, and components for loose
connections.
• Perform an operational checkout to
determine whether your furnace is
working properly and if it requires
adjustments.
• Inspect all condensate drain tubes
and condensate trap assembly for
leaks. The condensate removal system
should be cleaned annually by a quali-
fied service agency. Refer to the Ser-
vice and Maintenance Instructions for
further information.
• Examine the physical support of the
furnace. The support should be sound
with no cracks, sagging, gaps, etc.
around the base.
• Check furnace for any obvious signs
of deterioration.
BEFORE YOU REQUEST
A SERVICE CALL
If your furnace is not operating or not
performing properly, you may save
the expense of a service call by check-
ing a few things yourself before calling
for service.
This furnace has an LED operation
and fault code status display to aid the
installer, service technician, or home-
owner while installing or servicing the
unit. The LED code can be seen by
removing the access door and viewing
LED(s) through the view port in the
blower access panel.
NOTE:
Record the LED status code
BEFORE removing the blower access
door or turning off 115-v power to the
furnace. Removing the blower access
door or turning off the 115-v power will
end the LED status code display and
erase the code from the control’s
memory.
FOR INSUFFICIENT AIRFLOW:
• Check for dirty air filter(s).
• Check for blocked return-air or sup-
ply-air grilles throughout your home.
Ensure they are open and unobstructed.
If problem still exists, call your dealer
for service.
IF FURNACE FAILS TO OPERATE:
Follow this checklist step by step,
advancing to the next step only if fur-
nace fails to start.
• Check thermostat for proper tem-
perature. Is thermostat set above room
temperature?
• Is thermostat set to HEAT?
• Check fuses and circuit breakers. Is
electrical supply on?
• Is manual shutoff valve in gas supply
pipe in open position? (Follow start-up
procedures if you open gas valve.)
NOTE:
Turn off electrical supply
before continuing with checklist.
• Is control switch on gas valve in ON
position? (Follow start-up procedures
if you must reset switch to ON posi-
tion.)
• Check manual reset flame rollout
switch located on the burner box.
(See Fig. 2.) If furnace has experienced
high temperature conditions, this
switch will shut off the furnace. Reset
it by pushing the button on the switch.
If it trips again, shut down the furnace
and call for service. See “Shutting
Down Your Furnace” section in this
manual.
Summary of Contents for 345MAV
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