Lennox HVAC Unit LGT210H5V

Verify local code requirements with gas company or authorities

Refer to the LGT Installation, Operation and Maintenance instruction

Move test gauge to the outlet pressure tap on unit gas valve GV1 and/or GV3

Is the manifold pressure within the factory set range?

Replace the valve if manifold pressure is incorrect and no other source of improper pressure is found

Ensure gas valve cycles off completely and immediately in the event of gas or power failure

Use manual shut-off knob to immediately shut off gas supply if necessary

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

Verify local code requirements with gas company or authorities

Monitor combustion air inducer operation

Check that combustion air inducer is drawing fresh air and expelling exhaust gases

Ensure combustion air prove switch closes during inducer operation

Confirm ignition control activates first stage operator of gas valve

Check that sparking stops immediately after flame is sensed

Turn off electrical power to the unit at disconnect switch(es)

Ensure unit has no power by checking all power supplies

Label all wires prior to disconnection when servicing controls

Verify local code requirements with gas company or authorities

Inspect the unit for any visible damage or wear

Check piping for compliance with local codes

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

Checking Piping Connections for Gas Leaks

Use specialty Gas Leak Detector (Part number 31B2001)