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    johnair77's Avatar
    johnair77 Posts: 59, Reputation: 1
    Junior Member
    		  
    #1

    Apr 13, 2010, 01:59 PM
    Running refrig. Pipe over 50 ft.
    If I increase my suction from 3/4 to 7/8, do I need to increase my liquid line to? Going 70 ft. to attic. Thanks
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
    Ultra Member
    		  
    #2

    Apr 13, 2010, 02:25 PM

    What ton unit? And how many ft of vertical run?
    johnair77's Avatar
    johnair77 Posts: 59, Reputation: 1
    Junior Member
    		  
    #3

    Apr 13, 2010, 03:05 PM

    2.5 ton, 50 ft. vertical
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
    Uber Member
    		  
    #4

    Apr 13, 2010, 03:47 PM

    This may also require a crankcase heater and a hard start kit.
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
    Ultra Member
    		  
    #5

    Apr 13, 2010, 04:30 PM

    I would say 7/8 - 3/8 should do this OK with a 2.5 unit.
    johnair77's Avatar
    johnair77 Posts: 59, Reputation: 1
    Junior Member
    		  
    #6

    Apr 13, 2010, 06:50 PM

    Thanks for the input, some people even go so far as putting a suction accumulator or liq. Solenoid.
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #7

    Apr 13, 2010, 08:17 PM

    A suction accumulator would also be a very good idea.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #8

    Apr 14, 2010, 05:12 AM
    For a super deluxe job a receiver (if the condenser is not large enough to take all the liquid) and a pump down solenoid will control the weight of the column of liquid refrigerant upon shut down. This will prevent compressor oil wash out from the bearings etc.

    Quick Facts: Migration And Pump Down Systems - Service and Maintenance - Extra Edition - Air Conditioning, Heating & Refrigeration NEWS

    While possibly not critical there will also be a loss of cooling capacity due to the 50 foot height.

    Meier Supply - Pump Down

    Liquid slug or liquid in the crankcase will kill a compressor quickly so doing the job correctly will have many benefits.
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