Hvac Vacuum Pump Wiring Diagram. Pin 21 is shown to cct 31. Bad internal pressure relief refrigerant see defrost system.
Wundafloor does not supply. The one hose goes back around to the base of the pump this is the cycle switch and the other end goes to the t fitting on the suction side of the pump. Start with fresh oil in your pump vacuum pump oil has the ability to grab hold of moisture and contaminants.
When changing vacuum pump oil it is recommended that you change the oil while its warm warm oil holds more contaminants than cold oil.
Home reviews ideas robinair vacuum pump wiring diagram. Ok here is a picture of the pump mounted in the truck. Next wire the fuse to a positive ignition switched power source. The one hose goes back around to the base of the pump this is the cycle switch and the other end goes to the t fitting on the suction side of the pump.