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  1. #1
    Join Date
    Jul 2008
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    438

    Low side liquid charging devices

    I just recently picked up a Imperial Kwic Charge low side liquid charging device. I was under the impression that these flash the liquid to a gas to allow worry free low side liquid charging. It definatley seems to restrict it but it certainly does no flash it all to a vapor, it still continually feeds liquid even through the device. Whats the point in using one if it still allows liquid to enter the line?Was I just misunderstanding something, I know im using it correctly. Just looking for anyone elses thoughts or comments.

  2. #2
    Join Date
    Sep 2008
    Location
    Western PA
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    25,760
    How do you KNOW there is liquid reaching the system?

    I use mine pretty frequently and have not had a problem

  3. #3
    Join Date
    Feb 2010
    Location
    Newnan Ga,
    Posts
    104

    Imperial kwik charge

    The kwik charge is for Metering liquid refrigerant into system not (boiling off) or changing into vapor .Most techs put it on gauges but it is intended for use on inverted drum of refrigerant.it Meters in liquid slowly to safely charge a running system

  4. #4
    Join Date
    Jul 2008
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    438
    First thing I did was try it with the hose end open (deminimus release) just to see it work- I got liquid out every time. Also when low side charging the suction service valve begins frosting up- as in its taking liquid. The giving example is R22 A/C app. So if it where working correctley I should have 100% vapor after the device? That was the impression that I got. I know "they" say just throttling the low side on your manifold will accomplish the same thing, but if I have to charge a large amount while the systems running I thought it would be sweet to be able to just let the low side rip wide open while charging liquid through kwic charge and tend to other things you know what I mean.

  5. #5
    Join Date
    Feb 2010
    Location
    Newnan Ga,
    Posts
    104
    if you hook inline thru another set of gauges you'll see that it acts like a regulator of sorts .Normally while liquid charging you can actually blow 60 PSIG worth of liquid into a system but the kwik charge throttles it back to a safer pressure.if you think about it the only way to change liquid refrigerant into a vapor form is to expand into an evaporative state by means of metering or restriction.

    Hope this helps

  6. #6
    Join Date
    Jul 2009
    Location
    Connectitaxed
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    2,644
    Quote Originally Posted by dave1234 View Post
    First thing I did was try it with the hose end open (deminimus release) just to see it work- I got liquid out every time. Also when low side charging the suction service valve begins frosting up- as in its taking liquid. The giving example is R22 A/C app. So if it where working correctley I should have 100% vapor after the device? That was the impression that I got. I know "they" say just throttling the low side on your manifold will accomplish the same thing, but if I have to charge a large amount while the systems running I thought it would be sweet to be able to just let the low side rip wide open while charging liquid through kwic charge and tend to other things you know what I mean.
    I gave up a while ago trying to figure out how it works. All I know is that it works and saves me headaches!

  7. #7
    Join Date
    Sep 2008
    Location
    Western PA
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    25,760
    If you are insistent upon ONLY having vapor reach the unit as you are charging, you are going to need to create a means to add heat to the liquid that the Kwik Charge flashes off.

    Try putting a 50' roll of 1/4" copper in line after the Kwik charge. Run a fan on that to help evaporate the refrigerant.

  8. #8
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,066
    Has anyone ever really damaged a compressor by liquid charging? I do this all of the time without any special device. If I suspect "too much" liquid, I throttle down the valve manifold. I have let hundreds of pounds rip right into suction headers with no ill affects. Not even foam in the oil sight glass.

    I do not know the cost of special charging devices. But I guess if I absolutely needed one, I would make one out of old cap tube from a pressure control and some 1/4" soft copper with flares.

  9. #9
    Join Date
    Jul 2008
    Posts
    438
    Quote Originally Posted by Grayline View Post
    if you hook inline thru another set of gauges you'll see that it acts like a regulator of sorts .Normally while liquid charging you can actually blow 60 PSIG worth of liquid into a system but the kwik charge throttles it back to a safer pressure.if you think about it the only way to change liquid refrigerant into a vapor form is to expand into an evaporative state by means of metering or restriction.

    Hope this helps
    Yes it does! Actually thats kind of what I figured that was the intent the first time I tried it. It definatley restricts and lowers the pressure but I guess I was expecting it to "magically" ( ) turn it all to vapor. Just wanted to make sure it was working properly.

  10. #10
    Join Date
    Jul 2008
    Posts
    438
    Quote Originally Posted by jpsmith1cm View Post
    If you are insistent upon ONLY having vapor reach the unit as you are charging, you are going to need to create a means to add heat to the liquid that the Kwik Charge flashes off.

    Try putting a 50' roll of 1/4" copper in line after the Kwik charge. Run a fan on that to help evaporate the refrigerant.
    My main concern is when charging directley into the suction service valve on the comp. So the little bit of liquid entering after the restriction device is ok because its a lower pressure liquid and damaging the compressor isnt a big concern. I was just under the impression that you could use the kwic charge, open the low side on the manifold wide open and let er rip without damage to the compressor- but then when it starts to frost up the service valve while charging in a AC app I thought huh.

  11. #11
    Join Date
    Feb 2008
    Location
    California
    Posts
    2,066
    Dave1234.

    Just curious, but why have you all of a sudden decided to purchase one of these devices?

    How did you charge systems in the past?

    And did your old style of charging systems damage a compressor in any way shape or form?

  12. #12
    Join Date
    Jul 2008
    Posts
    438
    Quote Originally Posted by Phase Loss View Post
    Dave1234.

    Just curious, but why have you all of a sudden decided to purchase one of these devices?

    How did you charge systems in the past?

    And did your old style of charging systems damage a compressor in any way shape or form?
    Ive never damaged one from liquid charging into the suction line before. Id just throttle it in. I just picked when up because I quess I was under the idea you could just dump liquid in (now of course im talking about a large system that would take awhile). Obviously first Id charge as much liquid into the high side with the system off first. I firgued if I still had quite a bit of charging to do I could just open the gage and let the liquid safely go instead of slowly throttling it in so I would be free to do other things like clean up or what ever while toping off the charge. Does that make sense? I guess Im just always looking for ways to do quality work more effeciently.

  13. #13
    Join Date
    May 2007
    Posts
    735
    Has anyone ever really damaged a compressor by liquid charging?
    I have. 2 1/2 ton residential unit. A truly OMG moment and it was completely my fault because I was in a hurry. The company did the right thing in response and replaced the unit for the homeowner.

    Since then I either use a quick charger or throttle it in with the manifold by keeping the suction guage reading no more than 5 PSIG higher than the actual suction pressure.

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