669464R Nordyne Reversing Valve Description The 669464R is an official OEM 4-way reversing valve for Nordyne heat pump systems, engineered to switch refrigerant flow between the evaporator and condenser coils for heating and cooling modes. It features stainless-steel internal components housed in a durable aluminum body, and carries a 4-year limited warranty for reliable, long-term performance. Total kit weight is approximately 0.94 lb (0.43 kg). Key Specifications Specification Details Part Number 669464R Valve Type 4-way reversing valve Body Material Aluminum housing Internal Components Stainless-steel construction Warranty 4-year limited warranty Weight 0.94 lb (0.43 kg) Compatibility Series / Model Family Typical Models F8 Heat Pumps 5F8, 6F8, 8F8, 9F8 C20 Packaged Units C20AC, C20BC, C20BH D22 Packaged Units D22AC, D22BC, D22BH Replaces original part 669464 in all above applications2. Installation & Service Tips Always de-energize the 24 VAC control circuit before servicing. Remove old valve and inspect O-rings; replace with OEM gaskets. Orient the valve per the arrow marking on the body to match refrigerant flow direction. Torque inlet and outlet fittings to 10–15 ft·lb to ensure leak-free connections. Evacuate the system to ≤ 500 microns and perform a leak check at 150 % of operating pressure. Energize the coil with 24 VAC and observe valve shift under pressure prior to full startup. Cross-Reference & Resources OEM Replacement Mapping: 669464 → 669464R Solenoid-Valve Control Wiring Diagram for Nordyne SYSTX and Q-Series controls Heat-Pump Defrost Cycle Schematic Highlighting Valve Shift Timing Printable Service Card: Valve Port Identification & Torque Specifications
