Working on a Stanley Knight 10' table today, old R12 converted to Hot Shot although not 100% sure, not labeled anywhere. Newer Copeland condensing skid seems to be working good.
I am asked to lower temps slightly. But the previous service company's tech installed this skid and set it to operate on/off using a low pressure cut in/out switch. Using my low & high pocket gauges ( standard gauge screwed into a hose fitting) I am able to tweak the switch so the unit will operate slightly longer each cycle and cool the table box to 36F.
BUT, what am I missing? Seems to be working but with the compressor cycling on/off every 5 mins, not sure how long it will last? Is this a standard practice? No thermostat, rather use a Ranco low psi cut in/out switch to control the cycle? No liquid solenoid either.
Low side comes on at 28psi, falls to 15psi and opens the switch, slowly rises to 30 psi and closes the switch. I can't even get an accurate SH reading in such short period of time. BUT it's working!