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DISCONNECT MAIN ELECTRICAL
POWER TO THE UNIT BEFORE
ATTEMPTING MAINTENANCE.
FAILURE TO DO SO CAN CAUSE
ELECTRICAL SHOCK RESULTING
IN SEVERE PERSONAL INJURY
OR DEATH.
WARNING
LABEL ALL WIRES PRIOR TO DIS-
CONNECTION WHEN SERVICING
THE UNIT. WIRING ERRORS CAN
CAUSE IMPROPER AND DANGER-
OUS OPERATION RESULTING
IN FIRE, ELECTRICAL SHOCK,
PROPERTY DAMAGE, SEVERE
PERSONAL INJURY OR DEATH.
WARNING
DISCONNECT MAIN ELECTRICAL
POWER TO THE UNIT BEFORE
ATTEMPTING MAINTENANCE.
FAILURE TO DO SO MAY RESULT IN
ELECTRICAL SHOCK OR SEVERE
PERSONAL INJURY OR DEATH.
WARNING
6. Except for the mounting platform, keep all combustible articles three feet from the
unit and exhaust system.
7.
IMPORTANT:
Replace all blower doors and compartment cover after servicing
the unit. Do not operate the unit without all panels and doors securely in place.
8. Do not allow snow or other debris to accumulate in the vicinity of the appliance.
FURNACE SECTION MAINTENANCE
The unit’s furnace should operate for many years without excessive scale build-up
in flue passageways; however, it is recommended that a qualified installer, service
agency, or the gas supplier annually inspect the flue passageways, the exhaust sys
-
tem and the burners for continued safe operation, paying particular attention to dete-
rioration from corrosion or other sources.
If during inspection the flue passageways and exhaust system are determined to
require cleaning, the following procedures should be followed
(by a qualified install
-
er, service agency, or gas supplier):
1. Turn off the electrical power to the unit and set the thermostat to the lowest
temperature.
2. Shut off the gas supply to the unit either at the meter or at manual valve in
the supply piping.
3. Remove the furnace controls access panel and the control box cover.
4. Disconnect the gas supply piping from the gas valve.
5. Disconnect the wiring to the induced draft blower motors, gas valve, flame sen
-
sor, and flame roll-out control, and ignitor cable.
Mark all wires disconnected
for proper reconnection
.
6. Remove the screws (4) connecting the burner tray to the heat exchanger mount-
ing panel.
7. Remove the burner tray and the manifold assembly from the unit.
8. Remove the screws (10) connecting the four induced draft blowers to the col-
lector box and screws (12) connecting the inducer mounting plate to the heat
exchanger center panel. Remove the induced draft blowers and the collector box
from the unit.
9. Remove the turbulators from inside the heat exchangers by inserting the blade of
a screwdriver under the locking tabs. Pop the tabs out of the expanded grooves
of the heat exchanger. Slide the turbulators out of the heat exchangers.
10. Direct a water hose into the outlet of the heat exchanger top. Flush the inside
of each heat exchanger tube with water. Blow out each tube with air to remove
excessive moisture.
11. Reassemble (steps 1 through 9 in reverse order).
Be careful not to strip
out the screw holes used to mount the collector box and inducer blow-
er. Replace inducer blower gasket and collector box gasket with factory
replacements if damaged.
The manufacturer recommends that a qualified installer, service agency or the gas
supplier visually inspect the burner flames for the desired flame appearance at the
beginning of the heating season and approximately midway in heating season.
The manufacturer also recommends that a qualified installer, service agency or the
gas supplier clean the flame sensor with steel wool at the beginning of the heating
season.
LUBRICATION
IMPORTANT: DO NOT
attempt to lubricate the bearings on the blower motor or the
induced draft blower motor. Addition of lubricants can reduce the motor life and void
the warranty.
The blower motor and induced draft blower motor are prelubricated by the manufac-
turer and do not require further attention.
A qualified installer, service agency or the gas supplier must periodically clean the
motors to prevent the possibility of overheating due to an accumulation of dust and
dirt on the windings or on the motor exterior. And, as suggested elsewhere in these
instructions, the air filters should be kept clean because dirty filters can restrict air
flow and the motor depends upon sufficient air flowing across and through it to pre
-
vent overheating.
COOLING SECTION MAINTENANCE
It is recommended that at the beginning of each cooling season a qualified installer
or service agency inspect and clean the cooling section of this unit. The following
areas should be addressed: evaporator coil. condenser coil, condenser fan motor
and venturi area.
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