Lennox HVAC Unit LGT300H5M

Check all wiring for loose connections

Check for correct voltage at unit (unit operating)

Check amp-draw on both condenser fan motor and blower motor

Verify compliance with local code requirements

Refer to the LGT Installation, Operation and Maintenance instruction for more information

Verify ETL/CSA certification of LGT units

Consult with gas company or local authorities for piping code requirements

Refer to LGT Installation, Operation and Maintenance instruction

Select appropriate cleaning agent

Clean condenser coil with selected agent

Check local code requirements with gas company or authorities

Remove spark electrode assembly

Remove two screws securing the electrode assembly

Slide out the electrode assembly from the unit

Measure the spark gap using twist drills or feeler gauges

Is the spark gap between 0.125” and 0.140”?

Refer to LGT Installation, Operation and Maintenance instruction for more information

Check with gas company or authorities for local code requirements

Filter Inspection and Maintenance

Access filters through the economizer / filter access door

Check all six 24 X 24 X 2” fiberglass throw-away type filters

Clean or replace filters as necessary

Ensure correct 'AIR FLOW DIRECTION' marking on filter frame when re-installing

Check with gas company or authorities for local code requirements

Connect test gauge to the inlet pressure tap on unit gas valve GV1 and/or GV3

Test supply gas pressure with unit firing at maximum rate (both stages energized)

Is the gas supply pressure within the acceptable range?

Check each unit separately while operating at maximum rate, starting with the one closest to the supply gas main

Test multiple units with and without other units operating

Is the supply pressure within the acceptable range for all units?