verify that the pilot valve capillary tubes are not kinked or restricted

including flame sensing and high-limit switch oversight

Is this heat exchanger compatible with high-efficiency 90%+ AFUE furnaces

the 13W51 is specifically calibrated for the pressure-temperature characteristics of R-22 refrigerant

though the manual stem configuration is typically used in dedicated liquid or suction lines

Heil Quaker ICP 1175853 Valve 321894-708 verify that the pilot valveThe Heil Quaker ICP 1175853 Valve is an OEM 2 stage gas valve designed for high efficiency heating systems. Operating on a 24V control circuit, this component features a 3 4" inlet and 1 2" outlet configuration, engineered to manage gas flow with precision across low and high fire stages. It is factory set for 3. 2" WC but is adjustable to meet specific manifold pressure requirements for Natural Gas or Liquid Propane (LP) with a proper conversion kit.