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airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 8274
Experience:  Furnace, A/C and heat pump specialist.
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I have installed a new 2 ton air handler and heat pump and

Customer Question

I have installed a new 2 ton air handler and heat pump and my question is how do I know how much vacuum do I pull on 50 ft of set. With heatpump full of 410a
Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

You will pull the vacuum on the coil and line set before you open the service valves on the unit.Goodman recommends using a micron gauge and vacuuming to 250 microns.

Your vacuum gauge will only go down to 28" of vacuum but Goodman wants to pull all the way to 250 microns which requires using the micron gauge .