For high-demand residential and commercial air handlers

Common Questions: Is the Danfoss 023Z5004 compatible with R410A systems

ensuring the HVAC unit heater operates at peak efficiency without using indoor air for combustion

Robust housing construction designed to withstand corrosive flue condensates

Dwyer Instruments 1640-0 Switch 323613-751 For high-demand residential and commercialThe Dwyer Instruments 1640 0 Switch is a high precision differential pressure switch engineered for specialized HVACR applications requiring floating contact null switch logic. Unlike standard snap acting switches, the 1640 series utilizes a single pole double throw (SPDT) floating contact design to provide two distinct actuation pointshigh and lowwith a defined "null" zone in between. This makes it an ideal solution for motorized damper control and