It requires a constant 120V signal to close the valve and stop the flow

this OEM defrost control board manages the transition between heating and defrost modes by monitoring the nominal initiation temperature of 28°F and terminating the cycle once the coil reaches 55°F

Note that this specific model is provided without the solenoid coil

it is commonly used as a replacement for 1/2" models like the 67-X by utilizing an appropriate adapter

easily pairing with Belimo rotary actuators for seamless automation

Nordyne 664850R Service Valve 320788-704 It requires a constant 120VThe Nordyne 664850R Service Valve is a critical component for maintaining system integrity in residential and light commercial HVAC applications. This 3 8" liquid line refrigerant valve is designed for high pressure performance, featuring a durable brass body that ensures a leak proof connection in split system air conditioners and heat pump units. As a direct OEM replacement part, the 664850R facilitates precise refrigerant management during