Standard 302-272 kits typically feature Buna-N seals for general service

preventing the nuisance limit circuit lockouts or pressure switch errors (such as Code 31) that often plague aging high-efficiency furnaces

Common indicators include intermediate lockouts

a high-duty 24VAC solenoid coil (101813-01)

The 24Vac spring return actuator ensures a fail-safe closure upon power loss

Reznor 211481 Stat 319825-402 Standard 302-272 kits typically featureThe Reznor 211481 is a commercial grade 2 stage duct thermostat (Ductstat) engineered for precision terminal control in high demand HVACR environments. Carrying the manufacturing part number #600444832, this unit mounted control is built to interface seamlessly with Reznor UDAP, UDAS, UDBP, and UDBS series heaters, as well as LDAP model units. By utilizing a 24 VAC control circuit and a robust sensing probe, the Reznor 211481 Stat manages multistage