Combustion Area and Vent System — The com- bustion area and vent system should be visually inspected before each heating season. The normal accumulation of dirt, soot, rust, and scale can result in loss of efficiency and improp- er performance if allowed to build up.
If your unit makes an unusual or especially loud noises during heating, shut down the heating section and call your dealer.
See Fig. 1A, 1B and 5 and proceed as follows to inspect the combustion area and
1.Turn off gas supply to your unit.
2.Turn off electrical power to your unit.
3.Remove burner access panel.
4.Using a flashlight, carefully inspect the burner areas for dirt, soot, or scale.
If dirt, soot, rust, or scale accumulations are found, call your dealer and do not operate your heating section.
5.When you have completed your inspection, follow the
6.Observe unit heating operation.
Components in heat section may be hot after unit has been started up. When observing flame, be careful not to get to close to or touch heating components. Serious personal injury may result.
Watch the burner flame to see if it is bright blue. If you observe a suspected malfunction or that the burner flame is not bright blue, call your dealer.
7. Replace burner access panel.
MOTOR
GAS VALVE 
Fig. 5 — Typical Heat Section Detail
(Size 004-007 Shown)
Unit Panels — After performing any maintenance or service on the unit, be sure all panels are securely fastened in place to prevent rain from entering unit cabinet and to prevent disruption of the correct unit airflow pattern.
REGULAR DEALER MAINTENANCE
In addition to the type of routine maintenance you might be willing to perform, your unit should be inspected regularly by a properly trained service technician. An inspection (preferably each year, but at least every other year) should include the following:
1.Inspection of all flue product passages — including the burner, heat exchanger, and flue collector box.
2.Inspection of all combustion- and
3.Close inspection of all gas pipes leading to and inside your unit.
4.Inspection, and if required, cleaning of the condenser and evaporator coils.
5.Inspection, and if required, cleaning of the condensate drain pan and trap.
6.Inspection of all supply- and
7.Inspection of the unit base for cracks, gaps, etc., which may cause a hazardous condition.
8.Inspection of the unit casing for signs of deterioration.
9.Inspection of all electrical wiring and components to en- sure proper connection.
10.Inspection for leaks in the refrigerant circuit. Pressure- check to determine appropriate refrigerant charge.
11.Inspection and cleaning of fan wheels and housings, belt tension, and fan motor, shaft bearings, and pulley alignment.
12.Operational check of the unit to determine working con- ditions. Repair or adjustment should be made at the time of inspection.
Your servicing dealer may offer an economical service con- tract that covers seasonal inspections. Ask for further details.
Complete Service Instructions can be found in the unit Installation,
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