Split air conditioner outdoor condenser unit

Transfers heat from combustion to the supply air.

Duralok aluminized steel on ML180UHV furnace models.

Electrically ignites the gas burners.

Hot surface ignition system, no standing pilot on ML180UHV.

Controls and safely shuts off gas flow to the burners.

Redundant safety shutoff per CSA on ML180UHV.

Mixes gas and air and produces the flame to heat the exchanger.

Identified as a core furnace module in SL297UHNV parts ID.

Establishes proper combustion airflow and pre purge before ignition.

Assembly can be rotated 90 degrees to accommodate vent discharge.

Proves inducer airflow or negative pressure before allowing ignition.

Single pole single throw proving switch tied to furnace control.

Opens on flame rollout to shut down the burners for safety.

Called out in SL297UHNV parts identification.

Runs ignition sequence, monitors safeties, and modulates ECM blower for target airflow.

Varies PWM to adjust ECM motor speed and maintain constant CFM.

Moves air across the heat exchanger or evaporator coil into the ducts.

1/2 to 1 hp motors with air volume up to about 2180 CFM depending on model.

Protects blower and adjusts airflow if duct static is too high.

Maintains target CFM until about 0.8 in. w.g. ESP then enters cut back mode.

Distributes gas to the burners at the set pressure.

Typical manifold pressure 3.5 in. w.c. natural gas, 10.0 in. w.c. LP.

Provides power for controls, blower, inducer, and igniter.

120 V, 60 Hz, single phase supply on ML180UHV.

Routes flue products to a chimney or metal vent.

4 inch round flue connection listed for ML180UHV models.

Provides sealed combustion air intake and positive pressure exhaust to outdoors.

PVC intake and positively pressurized exhaust per SL297UHNV install.

Protects blower and coil and maintains indoor air quality.

Field provided high velocity filter required, recommended sizes listed in manual.

Modulates cooling capacity and efficiency in matched outdoor systems.

SL28XCV uses DC inverter with R 410A, SEER2 up to 25.80 depending on tonnage.

Rejects heat from refrigerant to outdoor air.

Quantum aluminum coil construction on current Lennox AC models.

Coordinates staging or modulation and system diagnostics across matched components.

SL28XCV requires Lennox communicating thermostat, S40 or S30, and a variable speed communicating furnace or air handler.