ClimateMaster 33B0006N16 TXV 322056 301 is a high capacity boiler pressure is a high capacity boiler pressure relief valve designed for heavy duty commercial and industrial hot water heating applications The Fenwal 35 665535 113 Control is a microprocessor based hot surface ignition (HSI) module engineered to handle automated sequencing and flame monitoring in 24 VAC gas fired heating systems Replacing a restricted or non responsive valve with this genuine HVAC thermal expansion valve restores optimal heat transfer efficiency and protects the compressor from high superheat overhead Is this an external or internal equalizer valve