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    mitchellpaloma's Avatar
    mitchellpaloma Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Aug 22, 2008, 07:07 AM
    Residential hvac
    When working w/ r 410a,do you need a special vacuum pump,if so which one,what are normal operating pressures on a 90 degree day,and can you use existing copper lines from r22?
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #2

    Aug 22, 2008, 08:22 AM
    No.

    There is no such thing as "normal".

    Maybe. Recommended diameter should match. Lines must be flushed.
    The oils from R22 and R410A are incompatible.
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