MARS 32621 Crankcase Heater 320788-702 This HVAC combustion safety switch

This HVAC combustion safety switch ensures reliable operation in high-efficiency heating systems by maintaining strict tolerances for air pressure differentials

For hot water (hydronic) systems

Re-use or replace your existing pressure switch separately

restoring the direct spark ignition sequence essential for safe fuel combustion

With a 1/2 PSI maximum pressure rating and electrical compatibility ranging from 120V to 277VAC

MARS 32621 Crankcase Heater 320788-702 This HVAC combustion safety switchExperienced HVAC contractors understand that protecting the compressor from liquid slugging is non negotiable. The MARS 32621 Crankcase Heater is a heavy duty, 240V 50W belt style heater engineered to maintain optimal lubricant temperature during the off cycle. By keeping the crankcase oil warmer than the rest of the system, this belly band heater effectively prevents refrigerant migration, ensuring that the compressor startup is smooth and the