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Charging pump

Slimpickins Member Posts: 323
I'm a HVAC contractor and getting back into solar and found out my old Grumman Jet pumps are bad. They were great for charging closed loops systems and I'm not sure parts are available. What pumps are ya'all using these days? I run into some silicone oil systems so I'll need two separate pumps. I'd like something fairly small, portable and not too pricy. My supply house said just use the ol' Silver King Force pump but I know that doesn't get all the air out. Thanks in advance!



  • hot_rod
    hot_rod Member Posts: 14,786
    for residential

    systems the 1/2 Teel or Liberty transfer pumps work well. We are starting to see some glycol charging carts on the market, I have one in the works.

    For larger systems I have seen guys use an old swimming pool pump on a cart or frame. A lot of GPM for flushing larger diameter systems.

    What's your plan for that old Gruman? I might be interested in it.

    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Kevin_in_Denver_2
    Kevin_in_Denver_2 Member Posts: 588

    You mean Grundfos Jet pumps, and I bet you could find parts.

    Model # JP4-48
    Superinsulated Passive solar house, Buderus in floor backup heat by Mark Eatherton, 3KW grid-tied PV system, various solar thermal experiments
  • Slimpickins
    Slimpickins Member Posts: 323
    Yeah you right

    Oops,  I did mean Grundfos. I think I got mixed up because it was the Grumman Sunsteam panels I installed back in the early 80's. Thanks Hot Rod for the advice on the Liberty pump which I brought to recharge a 3 panel DHW system I replaced a pump on. It worked great and I was amazed at the pressure I was able to achieve for purging.

    I will check with Grundfos for parts to repair because if I remember correctly the pump had a lot of oomph for larger systems.
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