How will my LP gauge read the pressure in the compressor head if I close the SUCTION SERVICE VALVE?
It wont. It will read crankcase pressure.

1. ignore any liquid valves.


2. Close (frontseat) the SUCTION SERVICE VALVE.
3. Bypass the LOW PRESSURE SWITCH.
4. Run the compressor until a vacuum is achieved.
5. Close the DISCHARGE SERVICE VALVE on the compressor.

6.Vent high to low through the manifold set. I.E. cap off the yellow line and open both blue and red wheels. pressure should now be low on both sides (2 to 5 psi maybe). change switches and open valves. run and set switches.
7. pub.

sling.