Induced Draft (Combustion Air) Blower; Flue Gas Passageways; Limit Switch; Burner Ignition - Carrier Comfort 48ES-A Installation Instructions Manual

g. Reinstall blower access panel (see Fig. 19).
3. Restore electrical power to unit. Start unit and check for
proper blower rotation and motor speeds during heating and
cooling cycles.
Induced Draft (combustion air) Blower Assembly
The induced- -draft blower assembly consists of the inducer motor,
the blower housing, and the induced- -draft blower wheel.
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 induced- -draft blower assembly as follows:
1. Remove control access panel (See Fig. 19).
2. Remove the 5 screws that attach induced- -draft blower as-
sembly to the flue collector box cover.
3. Slide the assembly out of the unit. (See Fig. 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:
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. 18) to the heat exchanger assembly. Inspect the
heat exchangers.
3. Clean all surfaces, as required, using a wire brush.
Fan Partition
Flue
Mounting
Collector
Inducer
Bracket
Box
Blower
Housing
Fig. 18 - - Blower Housing and Flue Collector Box
Integrated
Gas Unit
Controller
(IGC)
Auto Transformer
fuses used on 460
volt units only.
(Hidden)
Interface Fan
Board (IFB)
Induced Draft
Motor
Rollout
Switch
Burner
Mounting
Rack
Screw
A09193
COMPRESSOR
ACCESS PANEL
Fig. 19 - - Unit Access Panels

Limit Switch

Remove blower access panel (see Fig. 19). 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. 18). Module contains a self- -diagnostic LED. During
servicing, refer to label diagram or Table 5 in these instructions for
LED interpretation.
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

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.
49
CONTROL
ACCESS
BLOWER
PANEL
ACCESS
PANEL
A09207