Does this valve require a minimum pressure drop to function

A19AGD-18 is the direct replacement for A19AGA-60

this specific 3/4 HP unit is typically utilized in the outdoor condenser section

and HD60 models

Heil Quaker ICP 709557 Limit Switch 320788-703 Does this valve require aThe Heil Quaker ICP 709557 Limit Switch is a critical safety component designed for high limit temperature regulation in ICP furnaces. Engineered to handle a fixed temperature range of 160 200F, this auto reset limit switch acts as a primary defense against heat exchanger damage. When the internal plenum temperature exceeds the safety threshold, the 709557 switch breaks the electrical circuit to the gas valve or heating elements, preventing hazardous