Functional Devices-RIB TR20VA001 Transformer it is an OEM-level replacement

it is an OEM-level replacement for Lennox part numbers 78B72

the assembly includes a second-generation anti-explosion safety switch and is housed in a rugged aluminum case with a steel cover

Symptoms include sluggish actuator response or "frozen" pressure signals

Using the correct McDonnell & Miller 150-14 part is essential for contractors performing boiler maintenance to prevent localized leaks and ensure the mechanical head seats correctly against the body

A failed starting relay often shows an open circuit or visible signs of carbon buildup on the internal contacts

Functional Devices-RIB TR20VA001 Transformer it is an OEM-level replacementThe Functional Devices RIB TR20VA001 is a commercial grade 120V to 24V step down transformer engineered for reliable power distribution in HVACR control circuits. Providing a 20VA power rating, this unit is designed for continuous duty applications where stability is critical for low voltage controllers and relays. The TR20VA001 features inherently limited overcurrent protection, eliminating the need for external fusing and reducing potential failure