Resideo HPSR101 Relay 319847-401 Check the manufacturer date code

Check the manufacturer date code on your A-4400 filter housing

The post-purge timer keeps the venter motor running for a set duration after the thermostat is satisfied to remove residual flue gases and moisture

and 1060 units

offering easy integration into discharge piping while preventing equipment damage from system malfunctions or external heat loads

Operating on a 10 Volts D

Resideo HPSR101 Relay 319847-401 Check the manufacturer date codeThe Resideo HPSR101 Relay is a heavy duty single zone switching relay designed for demanding hydronic heating applications and general purpose cooling systems. Engineered to replace standard single pole relays, this unit features a 120V input and high performance DPDT switching capabilities. It provides reliable control for circulator pumps, boiler burners, and indirect water heaters by effectively bridging the gap between low voltage thermostats and