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  1. absrbrtek

    Carrier 23XRV experience

    I saw one on the test bench before they came o market while in Charlotte. You could not tell it was running, it was that quiet. The compressor is a Howden tri rotor screw. We do not have any that we service. The price seems to be high for our market. I like the idea its not a oil flooded screw...
  2. absrbrtek

    Very High temp refrigerant help

    Possibly an absorber would work. More detailed info would help.
  3. absrbrtek

    Chiller-Oil Acid & Moisture Purger (Oil Separator)

    What model chiller? The OAM works well, however there may be other ways to recover the oil such as the eductor that you do not have.
  4. absrbrtek

    Refrigerant side evaporator tube cleaning

    Try Hudson Technologies for the cleanup. You'll need at least 2" fittings to connect to. Bet the cost is in the 20k to 30k range. This is not a cheap proposition. Look under services, http://www.hudsontech.com/
  5. absrbrtek

    Centravac Chiller limited on high current

    What refrigerant? 11 or 123
  6. absrbrtek

    Centravac Chiller limited on high current

    What is your entering/leaving cond water temp and liquid line temp out of the condensor? What is your cond pressure? Can't answer your question without more info.
  7. absrbrtek

    1000 Ton CHiller with VSD...

    I have seen this before on a VFD retro. 2 oil pumps (not variable speed), 1 motor (the new 460v motor), multiple boards and electronics failures. Took the manufacturer just about 2 years to get it right. Had the 50 Hz flashcard in it instead of the 60 Hz. Finaly ran for about 4 months this year...
  8. absrbrtek

    Centravac Chiller has wide condenser approach

    Why a 34F delta T across the condenser? VFD? Are these temps off the panel or thermometers? What is the actual liquid line temp comming out of the condenser, not the saturated temp? Why 34F entering condenser water? You running a free cooling setup on a htex also?
  9. absrbrtek

    TONS of Waste Heat - Absorption Chilling?

    Just for simplification purposes, it takes aprox 19,000 BTU's of 12 PSI steam to get one ton of cooling out of a single stage absorber. It takes aprox 12,000 BTU's of 125 PSI steam to get one ton out of a 2 stage absorber. Yazaki makes some very nice absorbers and would be glad to help you out...
  10. absrbrtek

    Proper control for VAV air handler

    Fix the dampers open 100% and put a VFD on the fan. Probably be cheaper and alot less headaches. Use a sensor 3/4 of the way down the duct to control the static air pressure. Sounds like the ststem is way over controlled for such a simple aplication.
  11. absrbrtek

    Centrifugal chiller showing high cond. pressure in Stndby

    Air in the machine.
  12. absrbrtek

    PVC chiller piping

    I have seen too many PVC chilled water pipes blow apart and flood the building. One of the buildings was repiped in copper after multiple failures. I would not reccomend it, even though it is the cheapest option.
  13. absrbrtek

    R22/R134A conversion

    RMW, Id be interested in getting those htexs from you if your gonna just unload them. Id like to tie them into a pool to help heat it up.
  14. absrbrtek

    Cooling Towers -Indoor In-slab Sump

    Is this to prevent the sump from freezing during cold ODA temps or some other reason? "Buffering" tanks are normally used on the chilled water side to prevent rapid load swings on chillers. I have never seen a "buffering" tank on a cooling tower. I have seen indoor and underground sumps. The...
  15. absrbrtek

    Overloading Chiller

    If it has a newer style controller, the machine will unload due to high suction or high amperage. I would rather see a recip chiller run at full load than unloaded due to excessive starts like you had before you added the new load to it. JMHO
  16. absrbrtek

    Industrial Grade HVAC Pumps

    Aurora makes a nice pump. Just finishing up rebuilding (2) 2040 GPM pumps on 125 HP motors. This is the first work they have had in 15 yrs, they run about 10 months a yr 24/7 pumping chilled water. Make sure you order the pumps with mechanical seals and not the packing no matter what...
  17. absrbrtek

    1400 KW DX Plant for Offshore Platform

    You will have a system that no one will be able to service properly and will be broken constantly. If I had to take a guess, depending on the reciever size I would say your in the 3000 to 5000 pounds of refrigerant charge range. No way would I put my name on a design like that. This design would...
  18. absrbrtek

    Desuperheater from R134 to domestic hw

    With that far of a piping run and adding desuperheaters I think you'll have oil seperation and oil return issues. JMHO
  19. absrbrtek

    Minimum fan speed for vfd

    I'm with Rossabq, 30 Hz is a good minimum speed. The motor fan can't cool the motor properly below that speed in most aplications. If the motor is driving a gearbox, lubrication issues come to mind.
  20. absrbrtek

    Cost for VFD

    I think it depends on the options required for a particular installation. Interfaces, types of bypasses etc.

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