f.Connect 5 pin plug and 4 pin plug to indoor blower motor.
g.Reinstall blower access panel (see Fig. 18).
3.Restore electrical power to unit. Start unit and check for proper blower rotation and motor speeds during heating and cooling cycles.
1.Remove the induced draft blower assembly according to directions in the Induced Draft Blower Assembly section.
2.Remove the 11 screws holding the flue collector box cover (See Fig. 17) to the heat exchanger assembly. Inspect the heat exchangers.
3.Clean all surfaces, as required, using a wire brush.
Limit Switch
Fan Partition | Flue |
| |
Mounting | Collector | Inducer | |
Bracket | Box | ||
Blower | |||
|
| ||
|
| Housing |
Integrated Gas Unit Controller (IGC)
Auto Transformer
fuses used on 460
volt units only.
(Hidden)
Interface Fan
Board (IFB)
Induced Draft
Motor
Rollout
Burner Mounting Switch
Rack Screw
Remove blower access panel (see Fig. 18). Limit switch is located on the fan partition.
Burner Ignition
Unit is equipped with a direct spark ignition 100 percent lockout system. Ignition module (IGC) is located in the control box (See Fig. 17). Module contains a
If lockout occurs, unit may be reset by either momentarily interrupting power supply to unit or by turning selector switch to OFF position at the thermostat.
Main Burners
A
A09193
Fig. 17 - Blower Housing and Flue Collector Box
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.
Removal of Gas Train
To remove the gas train for servicing:
48EZ --
COMPRESSOR
CONTROL
BLOWER ACCESS
ACCESS PANEL PANEL
1. | Shut off main gas valve. |
2. | Shut off power to unit and install lockout tag. |
3. | Remove control access panel (See Fig. 18). |
4. | Disconnect gas piping at unit gas valve. |
5. | Remove fan partition mounting bracket (2 screws located |
| on the left side of the control compartment on the fan parti- |
| tion panel). Slide bracket forward, bottom first, to remove |
| (See Fig. 17). |
6. | Remove wires connected to gas valve. Mark each wire. |
7. | Remove the mounting screw that attaches the burner rack to |
| the unit base (See Fig. 17). |
8. | Partially slide the burner rack out of the unit (see Fig. 17 |
| and 20). Remove ignitor and sensor wires at the burner as- |
ACCESS PANEL
A09207
Fig. 18 - Unit Access Panels
Induced Draft (combustion air) Blower Assembly
The
Clean periodically to assure proper airflow and heating efficiency. Inspect blower wheel every fall and periodically during the heating season. For the first heating season, inspect blower wheel bimonthly 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
1.Remove control access panel (See Fig. 18).
2.Remove the 5 screws that attach
3.Slide the assembly out of the unit. (See 20). Clean the blower wheel. If additional cleaning is required, continue with Steps 4 and 5.
4.To remove blower wheel, remove 2 setscrews.
5.To remove inducer motor, remove screws that hold the inducer motor to the blower housing.
6.To reinstall, reverse the procedure outlined above.
Flue Gas Passageways
To inspect the flue collector box and upper areas of the heat exchanger:
| sembly. Remove rollout switch wires. |
9. | Slide the burner rack out of the unit (See Fig. 17 and 20). |
10. | To reinstall, reverse the procedure outlined above. |
Outdoor Coil, Indoor Coil, and Condensate Drain Pan
Inspect the outdoor coil, indoor 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.
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