III. Step 3
Turn off the electrical power supply to the unit.
IV. Step 4
Remove the front access panel.
V. Step 5
Move the selector switch on the internal gas valve to the OFF position.
VI. Step 6
Replace the front access panel.
VII. Step 7
Restore electrical power to the unit and set system switch to COOL to ensure operation of the cooling system during the cooling season.
ROUTINE MAINTENANCE
All routine maintenance should be handled by skilled, expe- rienced personnel. Your dealer can help you establish a stand- ard procedure.
For your safety, keep the unit area clear and free of combus- tible materials, gasoline, and other ¯ammable liquids and vapors.
To assure proper functioning of the unit, ¯ow of combustion and ventilating air must not be obstructed from reaching the unit. Clearance of at least 30 in. is required on all sides ex- cept the duct side.
MAINTENANCE AND CARE FOR THE
EQUIPMENT OWNER
Before proceeding with those things you might want to main- tain yourself, please carefully consider the following:
WARNING:
1.TURN OFF GAS SUPPLY AND ELECTRICAL POWER TO YOUR UNIT BEFORE SERVICING OR PERFORMING MAINTENANCE.
2.Do not turn off electrical power to this unit without ®rst turning off the gas supply.
3.When removing access panels or performing main- tenance functions inside your unit, be aware of sharp sheet metal parts and screws. Although special care is taken to reduce sharp edges to a minimum, be ex- tremely careful when handling parts or reaching into the unit.
I.Air Filters
Air ®lter(s) should be checked at least every 3 or 4 weeks and changed or cleaned whenever it becomes dirty. Dirty ®lters produce excessive stress on the blower motor and can cause the motor to overheat and shut down. Table 1 indicates the correct ®lter size for your unit. Refer to Fig. 5 to access the ®lter(s).
To replace or inspect ®lter(s) (or accessory ®lter rack when supplied):
1.Remove the ®lter access panel using a
2.Remove the ®lter(s) by pulling the ®lter(s) out of the unit. If the ®lter(s) is dirty, clean or replace with new one.
When installing the new ®lter(s), note the direction of the air- ¯ow arrows on the ®lter frame.
Fig. 2 Ð Gas Heating/Electric Cooling Unit
(Internal View)
If you have difficulty in locating your air ®lter(s), or if you have questions concerning proper ®lter maintenance, con- tact your dealer for instructions. When replacing ®lters, al- ways use the same size and type of ®lter that was supplied originally by the installer.
Table 1 Ð
UNIT SIZE | FILTER SIZE |
20x24 | |
20x24 | |
24x30 | |
20x20 | |
583A036 | 20x24 |
24x30 |
*For ®lter grille installations only.
WARNING: Never operate your unit without ®lters in place. Failure to heed this warning may result in dam- age to the blower motor and/or compressor. An accumu- lation of dust and lint on internal parts of your unit can cause loss of ef®ciency and, in some cases, ®re.
II. Heat Exchanger
To ensure dependable and efficient heating operation, the heat exchanger should be checked by a quali®ed maintenance per- son before each heating season, and cleaned when necessary. This checkout should not be attempted by anyone not having the required expertise and equipment to properly do the job. Checking and/or cleaning the heat exchanger involves remov- ing the gas controls assembly and the ¯ue collector box cover and, when completed, reinstalling the gas controls assembly for proper operation. Also, the ¯ue collector box cover must be replaced correctly so that a proper seal is maintained. Con- tact your dealer for the required periodic maintenance.
III. Fans and Fan Motor
Periodically check the condition of fan wheels and hous- ings and
IV. Evaporator and Condenser Coils
Cleaning of the coils should only be done by quali®ed service personnel. Contact your dealer for the required annual maintenance.
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