a wet-to-wet differential pressure transducer is required

a Danfoss AME series actuator should be specified

allowing the HVAC high limit switch to re-engage once the system cools to 110°F

this specific model is a 3-phase heat kit

a critical feature for rapid troubleshooting during peak service seasons

Siemens Combustion LFL1.335 Control 318820-201 a wet-to-wet differential pressure transducerThe Siemens Combustion LFL1. 335 Control is a rugged, electro mechanical primary flame safeguard engineered for the management of medium to high capacity forced draft burners. Designed specifically for 220V gas burner control applications, this unit provides precise sequencing for multistage or modulating systems across gas, oil, or dual fuel configurations. It features a fixed 37 second pre purge time (t1) and a 2. 5 second safety time (TSA),