This is a factory-set fixed pressure control

What happens if I accidentally plumb the high and low ports backward

It is not compatible with 1-pipe steam radiators which require specialized air venting through the valve body

minimizing downtime during service

and RP series

Trane THT1248 Thermostat 340793-762 This is a factory-set fixedThe Trane THT1248 Thermostat is a critical high limit switch engineered for precision thermal protection in residential and light commercial HVAC systems. Functioning as a safety critical normally closed (NC) control, this limit thermostat is designed to mechanically break the electrical circuit when the system reaches 150F. This automated disruption immediately shuts down burners or heating elements, preventing heat induced damage to the heat