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  1. hinesguy

    aurora 411 pump

    We had a vendor come in who knew the pump. Turns out they sent us the wrong parts. We need a balanced seal. We can use some of the other parts, bearings, grease seals, etc. So now we are waiting on new seals. Should have just sent the damn thing out.
  2. hinesguy

    aurora 411 pump

    We contacted Aurora and they said they cannot deal with us. We have to deal with a rep. The rep we deal with doesn't seem to know anything but how to look up part numbers and send us "things". Very frustrating. They sent us a bronze sleeve to replace the old sleeve, why I don't know. Also the...
  3. hinesguy

    aurora 411 pump

    No one seems to know what to do. All we want to do is replace the mechanical seal and bearings. they keep sending us parts that do not fit.
  4. hinesguy

    aurora 411 pump

    Is anyone very familiar with this pump. We are having trouble getting the correct parts for it. The distributor has sent us the wrong mechanical seals. Now they sent us a sleeve, which is not what we need. The stationary seal is also wrong.
  5. hinesguy

    Heat balance

    they where brushed with a Goodway. You think that they aren't clean enough and this is causing heat transfer probs. This is what I was thinking.
  6. hinesguy

    Heat balance

    The Dp for the condenser is around 3.4 but goes to 9 psi when 2 pumps are used. Temps are around 6 to 9 delta T.
  7. hinesguy

    Heat balance

    In my previous thread I asked about heat balance and efficiency testing. Since i will have to talk about this next week with the auditor, I have a basic question. What would cause such an imbalance in evaporator tonnage to condenser tonnage. The tubes have been cleaned recently. The machine was...
  8. hinesguy

    chiller efficiency testing

    Here's the test I did today: CONDENSER DESIGN ACTUAL 1 TEMPERATURE IN 85.00 84.00 TEMPERATURE OUT 99.00 92.00 TEMPERATURE DIF 14.00 8.50 PRESSURE DIF 3.40 8.50 Gpm's 1100 1739 TONNAGE 646 615.99 PERCENT LOAD 100.00% 95.35% EVAPORATOR DESIGN ACTUAL 1 TEMPERATURE IN 58.70...
  9. hinesguy

    chiller efficiency testing

    It was a typo. The design delta P is 3.4 for the condenser. Once we started a second pump we got it to 9 psi. This got our heat balance to spec but it uses an extra 55 amps to do it. Chiller amps remained the same, so to me it's not worth it. The design specs also called for 85 degree water in...
  10. hinesguy

    chiller efficiency testing

    Neither do I, but the program calls for a 5% heat balance. We tried running 3 condenser pumps for 2 machines today to achieve a 9 psi differential on the condenser water. This worked but it consumes more amperage to do this. The chiller amps did not go down and total amps to run the 2 machines...
  11. hinesguy

    chiller efficiency testing

    Has anyone done a chiller efficiency test. We are getting some weird numbers. Heat balance is supposed to be 5% or less. We are getting 30% to 40%. The machines are running well, tubes have been cleaned. They are carrier low pressure 540 ton. These are my readings I took at this moment: ref...
  12. hinesguy

    expansion tank pressure

    I think at one point someone overfilled the system, probably by filling it when the system was running. I just added some to the tank which was warm and at 0 psi. It's at 6 psi now and I will check it once I start up.
  13. hinesguy

    expansion tank pressure

    We are going to add glycol to the tank after the system has been off and warmed up for a while. Going for 10 psi. System has to be short, and I think in the past they added to it while running which created the blow off problem . This way that can't happen as it will only contract as it chills...
  14. hinesguy

    expansion tank pressure

    Just checked the supply and return lines for the upper house fan coils. They where at 0 or below, no compound gauge to see. But we are getting decent cooling out of them. This is getting weird. It would seem we are starving the coils, but they are cooling.
  15. hinesguy

    expansion tank pressure

    On second thought the tank is probably a diaphragm type, like an Amtrol.
  16. hinesguy

    expansion tank pressure

    There is positive pressure at the pump inlets of around 180 psi. The only vaccuum reading we get is at the expansion tank at the top of the loop. This is a primary only system. Do not believe the tank has a diaphragm. This is the main expansion tank on the 35th floor, all the pumps and chillers...
  17. hinesguy

    expansion tank pressure

    Our expansion tank (glycol system for comfort cooling) runs at a positive pressure when the system is off and goes into a vaccuum when running, sometimes as much as 20 Hg. Is this normal.Seems like a pretty high vaccuum. System: Three 540 ton chillers, two 260 ton chillers. supplying 6 main...
  18. hinesguy

    pump insulation

    The armaflex sounds like a good solution. We have a very good insulation guy.
  19. hinesguy

    pump insulation

    Our CHW pumps are housed in boxes stuffed with insulation. The insulation stays wet from sweating and it's starting to rust the piping. Has anyone found a better way.

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