This article talks about how to serve your outdoor unit at home. And will list the necessary tools to do it successfully.
Ensure that the dust cover has been removed from service port.
Connect your service multiplied gauges. (Make sure the connection is secure so there is no refrigeration leak after opening the line from the outdoor unit).
Ensure that the service tank is connected to the yellow line of manifold gauge.
Open the service port on the outdoor unit.
Open the service port for the service tank.
Read your gauges to see what the pressure is. (It can be used to determine how much refrigerant you would need in the system).
Once the servicing is complete, stop the service ports in the service tank.
Ensure that all the refrigerators have made their way into the outer unit from your gauge. (The pressure will fall to 0psi)
Make sure the system pressure is equal to what is being said.
Close the service port on the outdoor unit.
Disconnect the manifold gauges.
Ensure that air pressure is not left behind in the manifold gauge after disconnect.
Reinstall the dust caps to the service ports.
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