Table of Contents
Advertisement
30
B. FURN CE SECTION M INTEN NCE
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 system and the burners
for continued safe operation, paying particular attention to deterioration 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 installer, service
agency, or gas supplier):
1. Turn off the electrical power to the unit and set the thermostat to the lowest tem-
perature.
2. Shut off the gas supply to the unit either at the meter or at manual valve in the
supply piping.
W RNING
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN SERVICING CON-
TROLS. WIRING ERRORS CAN CAUSE IMPROPER AND DANGEROUS OPER-
ATION RESULTING IN FIRE, ELECTRICAL SHOCK, PROPERTY DAMAGE, PER-
SONAL INJURY OR DEATH.
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 motor, gas valve, flame sensor, 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 mounting
panel.
7. Remove the burner tray and the manifold assembly from the unit.
8. Remove the screws (4) connecting the induced draft blower to the collector box and
screws (16) connecting the collector box to the heat exchanger mounting panel.
Remove the induced draft blower 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 10 in reverse order). Be careful not to strip out the
screw holes used to mount the collector box and inducer blower. Replace induc-
er blower gasket and collector box gasket with factory replacements if dam-
aged.
W RNING
HOLES IN THE EXHAUST TRANSITION OR HEAT EXCHANGER CAN CAUSE
TOXIC FUMES TO ENTER THE HOME. THE EXHAUST TRANSITION OR HEAT
EXCHANGER MUST BE REPLACED IF THEY HAVE HOLES OR CRACKS IN
THEM. FAILURE TO DO SO CAN CAUSE CARBON MONOXIDE POISONING
RESULTING IN PERSONAL NJURY OR DEATH.
The manufacturer recommends that a qualified installer, service agency or the gas suppli-
er 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.
W RNING
DISCONNECT MAIN ELECTRICAL POWER TO THE UNIT BEFORE ATTEMPT-
ING MAINTENANCE. FAILURE TO DO SO MAY RESULT IN ELECTRICAL
SHOCK OR SEVERE PERSONAL INJURY OR DEATH.
Advertisement
Table of Contents
