The "U" suffix typically denotes universal packaging for retail or distribution

and EV250B solenoid valves

this is a 1-pole unit with a shunt

condenser fan

Weil McLain 510-312-209 Temperature Control Els PW 17895 The "U" suffix typically denotesThe Weil McLain 510 312 209 is a field proven High Limit Temperature Control engineered for critical hydronic safety in residential and commercial boiler systems. Designed specifically for the Weil McLain EG, EGH, LGB, MGB, and SGO boiler series, this SPST aquastat provides reliable over temperature protection. It operates on an automatic recycle logic, ensuring that the system restarts without manual intervention once water temperatures return to