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  1. Thread: pumpdown

    by boneman
    Replies
    20
    Views
    2,400

    reply to jism jeff

    Maybe jism jeff could pry himself away from the Jerry Springer show long enough to look up the word "professional". He obviously is not intrested in using his knowledge in a constructive way as a...
  2. Replies
    1
    Views
    700

    I have read that on a water cooled condenser the...

    I have read that on a water cooled condenser the outlet water temp. should be 10*F lower than the condensing temp. So if I had a 134a head pressure 135# (or 105*F), I should expect an outlet water...
  3. Thread: pumpdown

    by boneman
    Replies
    20
    Views
    2,400

    Why does the low side need to be pumped down when...

    Why does the low side need to be pumped down when just normally shutting off? What is the purpose of the pumpdown?
  4. Replies
    11
    Views
    2,070

    Thanks. The system is an R 12 semi hermetic...

    Thanks. The system is an R 12 semi hermetic freezer that has been changed over to 134 a. We covered up the condenser and brought the head pressure uo to 185 psig. The suction pressure was 15 psig....
  5. Replies
    11
    Views
    2,070

    What is considered to be a good range for...

    What is considered to be a good range for compressor compression ratio? High end and low end as well.
  6. Thread: Refrigerant ID

    by boneman
    Replies
    6
    Views
    906

    how can you tell what refrigerant is in a system...

    how can you tell what refrigerant is in a system that has somehow had its nameplate defaced or removed? Temperature and pressures for R-12, R-134a and R-409a are very close and I am not convinced a...
  7. Thread: contactors

    by boneman
    Replies
    7
    Views
    1,214

    Here is what I don't get. I have a bad contactor...

    Here is what I don't get. I have a bad contactor to replace. The contactor says 1 1/2 Hp. It also says 25 fla and 150 lra. If I multiply 1 1/2 hp X 746 (watts per Hp)= 1119. Divide that by 115 (coil...
  8. Thread: contactors

    by boneman
    Replies
    7
    Views
    1,214

    What is the formula to match horsepower ratings...

    What is the formula to match horsepower ratings to amperage ratings of contactors?
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