the supply pressure should be at least 0

The mode is determined by the internal jumper settings (J2)

often due to a dirty blower wheel

significantly reducing energy consumption in unoccupied spaces

York S1-FRNR50 Fuse 320819-301 the supply pressure should beThe York S1 FRNR50 Fuse is a high performance Class RK5 dual element time delay fuse designed for critical protection in HVACR systems. Rated for 50 Amps at 250V AC, this Fusetron current limiting fuse is engineered to handle the high inrush currents typical of compressor motors and condenser fans without nuisance tripping. Its dual element construction provides a minimum 10 second time delay at 500% of the rated load, allowing inductive loads to