Carrier 48ES Скачать руководство пользователя страница 24

Страница: 24 / 30

1. Remove the combustion blower wheel and motor assembly

according to directions in the Combustion--Air Blower

section.

2. Remove the 3 screws holding the blower housing to the flue

collector box cover (See Fig. 18--21).

3. Remove the 12 screws holding the flue collector box cover

(See Fig. 20--21) to the heat exchanger assembly. Inspect the

heat exchangers.

4. Clean all surfaces, as required, using a wire brush.

INDUCED DRAFT (COMBUSTION AIR) BLOWER

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 motor and wheel as follows:

1. Remove unit access panel (See Fig. 19).
2. Remove the 7 screws that attach induced--draft motor

mounting plate to blower housing (See Fig. 20).

3. Slide the motor and blower wheel assembly out of the blower

housing (See Fig. 20). Clean the blower wheel. If additional
cleaning is required, continue with Steps 4 and 5.

4. To remove blower, remove 2 setscrews.
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.

LIMIT SWITCH

Remove unit access panel. Limit switch is located on the blower
partition.

BURNER IGNITION

Unit is equipped with a direct spark ignition 100 percent lockout

system. Ignition module is located in the control box (See Fig. 18).
Module contains a self--diagnostic LED. During servicing, refer to

label diagram 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.
Removal of Gas Train
To remove the gas train for servicing:

1. Shut off main gas valve.
2. Shut off power to unit and install lockout tag.
3. Remove unit access panel (See Fig. 19).
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 unit base (See Fig. 18).

8. Slide the burner rack out of the unit (See Fig. 18 and 21).
9. To reinstall, reverse the procedure outlined above.

OUTDOOR COIL, INDOOR 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 detergent and water solution. Rinse coils with clear
water, using a garden hose. Be careful not to splash water on motors,

insulation, wiring, or air filter(s). For best results, spray condenser
coil fins from inside to outside the unit. On units with an outer and

inner condenser coil, be sure to clean between the coils. Be sure to

flush all dirt and debris from the unit base.
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 trough with

clear water. Do not splash water on the insulation, motor, wiring, or

air filter(s). If the drain trough is restricted, clear it with a “plumbers
snake” or similar probe device.

INDUCED DRAFT MOTOR MOUNT

FLUE

COLLECTOR

BOX