Nordyne 663864R Service Valve Check the rating plate on

Check the rating plate on the interior of the furnace cabinet

High Isolation Design: Split-bobbin construction enhances dielectric strength and reduces the risk of electrical leakage

While a 3-wire kit uses a separate potential relay

Never touch the black element with bare hands

The LM series generally requires a minimum of 1

Nordyne 663864R Service Valve Check the rating plate onThe Nordyne 663864R Service Valve is a technical grade 3 4" low side suction line valve engineered for critical field replacements in split system air conditioning and heat pump units. As a direct successor to legacy part numbers 663575, 663992, and 663992R, this component ensures full mechanical compatibility with older Nordyne, Intertherm, and Miller HVAC platforms. This HVAC service valve replacement features a robust brass construction designed to