BLOWER |
HOUSING |
2 SETSCREWS |
(HIDDEN) |
C99085 |
Fig. 26—Removal of Motor and Blower Wheel
C99090
Fig. 27—Unit Access Panel
1.Remove the combustion blower wheel and motor assembly according to directions in
2.Remove the 3 screws holding the blower housing to the flue collector box cover (see Fig. 25).
3.Remove the 12 screws holding the flue collector box cover (Fig. 25) to the heat exchanger assembly. Inspect the heat exchangers.
4.Clean all surfaces as required, using the wire brush.
D. Combustion-Air Blower
Clean periodically to assure proper airflow and heating efficiency. Inspect blower wheel every fall and periodically during heating season. For the first heating season, inspect blower wheel bi- monthly to determine proper cleaning frequency.
To inspect blower wheel, remove draft hood assembly. Shine a flashlight into opening to inspect wheel. If cleaning is required, remove motor and wheel as follows:
1.Remove unit access panel (See Fig. 24).
2.Remove the 7 screws that attach
3.Slide the motor and blower wheel assembly out of the blower housing (See Fig. 26). Clean the blower wheel. If additional cleaning is required, continue with Steps 4 and 5.
4.To remove blower, remove 2 setscrews (See Fig. 26).
5.To remove motor and cooling fan assembly, remove 4 screws that hold blower housing to mounting plate.
6.To reinstall, reverse the procedure outlined above.
E. Limit Switch
Remove unit access panel. Limit switch is located on the blower partition.
F. Burner Ignition
Unit is equipped with a direct spark ignition 100% lockout system. Ignition module is located in the control box. Module contains a
If lockout occurs, unit may be reset by either momentarily interrupting power supply to unit, or turning selector switch to OFF position at the thermostat.
G. Main Burners
At the beginning of each heating season, inspect for deterioration or blockage due to corrosion or other causes. Observe the main burner flames and adjust if necessary.
CAUTION: When servicing gas train, do not hit or plug orifice spuds.
REMOVAL OF GAS TRAIN
1.Shut off manual gas valve.
2.Shut off power to unit.
3.Remove unit access panel (See Fig. 27).
4.Disconnect gas piping at unit gas valve.
5.Remove wires connected to gas valve. Mark each wire.
6.Remove ignitor and sensor wires at the ignitor module.
7.Remove the mounting screw that attaches the burner rack to the basepan (See Fig. 25).
8.Slide the burner rack out of the unit (See Figs. 25 and 28).
9.To reinstall, reverse the procedure outlined above.
H. Condenser Coil, Evaporator Coil, and Condensate Drain Pan
Inspect the condenser coil, evaporator coil, and condensate drain pan at least once each year.
The coils are easily cleaned when dry; therefore, inspect and clean the coils either before or after each cooling season. Remove all obstructions, including weeds and shrubs, that interfere with the airflow through the condenser coil.
Straighten bent fins with a fin comb. If coated with dirt or lint, clean the coils with a vacuum cleaner, using the soft brush attachment. Be careful not to bend the fins. If coated with oil or grease, clean the coils with a mild
Inspect the drain pan and condensate drain line when inspecting the coils. Clean the drain pan and condensate drain by removing all foreign matter from the pan. Flush the pan and drain tube with clear water. Do not splash water on the insulation, motor, wiring, or air filter(s). If the drain tube is restricted, clear it with a ‘‘plumbers snake’’ or similar probe device. Ensure that the auxiliary drain port above the drain tube is also clear.
