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the 8402-078BX is the manufacturer’s updated part number
Built to meet exact OEM tolerances
The 311616 spring is typically used in the MP953A and C direct-acting models to force the stem down upon air pressure loss
the orifice may be enlarged or fouled and should be replaced with a genuine Nordyne 660303R
ensuring long-term HVAC system performance
Functional Devices RIBMN24S Relay the 8402-078BX is the manufacturer’sThe Functional Devices RIBMN24S is a high reliability 2. 75" track mount pilot relay designed for seamless integration into building automation systems (BAS) and HVAC mechanical rooms. This 15 Amp SPST relay features a 24 Vac dc coil, providing versatile control for HVACR equipment, lighting loads, and motor circuits. Engineered for the field, it includes a built in override switch for manual testing and maintenance, allowing technicians to bypass the