Lennox HVAC Unit LGT180H5M

Check with gas company or authorities for local code requirements

Refer to the LGT Installation, Operation and Maintenance instruction

Ensure emergency shutdown procedures are known

Disconnect and isolate the gas valve

Ensure gas valves are not subjected to more than 0.5 psig

Use specialty Gas Leak Detector (part number 31B2001)

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

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)

Enter the supply gas pressure reading

Is the supply gas 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?

Preliminary and Seasonal Checks

Ensure the unit is installed according to installation instructions and applicable codes.

Inspect all electrical wiring for loose connections and tighten as required.

Check refrigerant lines for good condition and ensure they do not rub against the cabinet or other lines.

Check voltage to ensure it is within the range listed on the nameplate.

Is the voltage within the range listed on the nameplate?

Recheck voltage and amp draw with unit running.

Is the running voltage within the range listed on the nameplate?

Inspect and adjust blower belt.

Verify local code requirements with gas company or authorities

Refer to the LGT Installation, Operation and Maintenance instruction

Check connecting lines for evidence of oil leaks

Check connecting lines for evidence of refrigerant leaks

Inspect coil for evidence of oil leaks

Inspect coil for evidence of refrigerant leaks