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You should swap your existing orifices or install new ones calibrated for the specific BTU and gas type (Propane or Natural Gas) required for the job
This externally equalized valve
OEM Compatibility: Exact drop-in replacement for York 492-16939-005
many Lennox systems utilize a crankcase thermostat (S40) to cycle the heater based on ambient or liquid line temperatures for energy efficiency
the component has failed and must be replaced
Siemens Building Technology 331-4810 Actuator R-448A You should swap your existingThe Siemens 331 4810 is a rugged, metal fabricated No. 3 Pneumatic Actuator engineered for reliable modulating or two position control of HVAC dampers and terminal units. Built with all metal construction and a totally enclosed housing, this 331 Series actuator is a staple for contractors maintaining mixing box dampers, unit ventilators, and air valves. It features a 2 3 8 inch stroke and a nominal 8 13 psi spring range, allowing for precise