Trane OA1D OA2D OA3D (Indirect Gas-Fired/Electric Heat) Manuel De Maintenance

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 OAU-SVX01E-EN

Make sure all personnel are standing clear of the unit 
before proceeding. The system components will start 
when the power is applied.

Before completing the following checks, turn the unit OFF 
and lock the main power disconnect switch open.

•

Inspect the return air filters. Clean or replace them if 
necessary. Refer to the unit Service Facts for filter 
information and refer to 

 in 

 for exact replacement dimensions.

Airflow through the unit is affected by the amount of dirt 
and debris accumulated on the indoor coil and filters. 

To insure that airflow through the unit is adequate for 
proper sampling by the return air smoke detector, 
complete adherence to the maintenance procedures, 
including recommended intervals between filter changes, 
and coil cleaning is required.

Periodic checks and maintenance procedures must be 
performed on the smoke detector to insure that it will 
function properly. 

For detailed instructions concerning these checks and 
procedures, refer to the appropriate section(s) of the 
smoke detector Installation and Maintenance Instructions 
provided with the literature package for this unit.

•

Check the unit’s drain pans and condensate piping to 
ensure that there are no blockages.

•

Inspect the evaporator and condenser coils for dirt, 
bent fins, etc. If the coils appear dirty, clean them 
according to the instructions described in 

•

Manually rotate the condenser fan(s) to ensure free 
movement and check motor bearings for wear. Verify 
that all of the fan mounting hardware is tight.

•

Inspect the F/A-R/A damper hinges and pins to ensure 
that all moving parts are securely mounted. Keep the 
blades clean as necessary.

•

Verify that all damper linkages move freely; lubricate 
with white grease, if necessary.

•

Check supply fan motor bearings; repair or replace the 
motor as necessary.

•

Check the fan shaft bearings for wear. Replace the 
bearings as necessary.

•

Verify that all wire terminal connections are tight.

•

Remove any corrosion present on the exterior surfaces 
of the unit and repaint these areas.

•

Generally inspect the unit for unusual conditions (e.g., 
loose access panels, leaking piping connections, etc.).

•

Make sure that all retaining screws are reinstalled in 
the unit access panels once these checks are complete.

•

With the unit running, check and record the: ambient 
temperature; compressor suction and discharge 
pressures (each circuit); superheat (each circuit); 
Record this data on an “operator’s maintenance log” 
like the one shown in 

. If the operating 

pressures indicate a refrigerant shortage, measure the 
system superheat.

•

Inspect the unit’s air filters. If necessary, clean or 
replace them.

•

Check supply fan motor bearings; repair or replace the 
motor as necessary.

•

Inspect both the main unit control panel and heat 
section control box for loose electrical components 
and terminal connections, as well as damaged wire 
insulation. Make any necessary repairs.

•

Verify that the electric heat system operates properly.

Regular coil maintenance, including annual cleaning, 
enhances the unit’s operating efficiency by minimizing: 
compressor head pressure and amperage draw; 
evaporator water carryover; fan brake horsepower, due to 
increase static pressure losses; airflow reduction.

At least once each year, or more often if the unit is located 
in a “dirty” environment, clean the condenser coils using 
the instructions outlined below. Be sure to follow these 
instructions as closely as possible to avoid damaging the 
coils.