While a 3-pole contactor can technically switch a single-phase load by using two of the three poles

and mineral oils without breaking down or stripping essential additives from the lubricant

a clogged or missing AT-529 restrictor is often the culprit

the VAL5023 serves as a direct replacement part that restores system balance and eliminates common issues like coil freeze-ups or liquid slugging

As the direct 802 replacement

BASO C661BEA-1C Ignition Control Els PW 17895 While a 3-pole contactor canThe BASO C661BEA 1C Ignition Control is a specialized 24Vac intermittent pilot ignition module designed for precise atmospheric burner control in commercial and residential HVAC systems. Engineered for high reliability applications, this unit features a single try ignition sequence with specific timing parameters: a 4 second pre purge, a 15 second inter purge, and a 25 second trial for ignition. Utilizing remote flame sensing technology, the C661BEA