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  1. Thread: 404a low temp

    by james mo
    Replies
    12
    Views
    321

    Also in case I don't get back to this in the near...

    Also in case I don't get back to this in the near future, thank you very much Ice and PHm. I really appreciate your input.
  2. Thread: 404a low temp

    by james mo
    Replies
    12
    Views
    321

    I'm sorry, I am ended my post a little bit too...

    I'm sorry, I am ended my post a little bit too late. Would you mind Checking my last post again? I'm inclined to look at that unit you suggested looking at as I do not have time to run out to this...
  3. Thread: 404a low temp

    by james mo
    Replies
    12
    Views
    321

    Makes perfect sense phm...thx

    Makes perfect sense phm...thx
  4. Thread: 404a low temp

    by james mo
    Replies
    12
    Views
    321

    Ice....the undersized tev explains the high...

    Ice....the undersized tev explains the high discharge temp to me, but why would low temp units not handle higher ambient better? Wouldn't they have more condenser? Refrigeration is not my strong...
  5. Thread: 404a low temp

    by james mo
    Replies
    12
    Views
    321

    To answer your other questions. This is a low...

    To answer your other questions. This is a low pressure fire suppression system and the discharge temp sensor is on the compressor discharge line
  6. Thread: 404a low temp

    by james mo
    Replies
    12
    Views
    321

    Phm.... I think you just nailed it. Trying to...

    Phm.... I think you just nailed it. Trying to maintain 295 psi on the co2 tank. I didn't noticed that these were medium temp rated units. Another company replaced all of the condensers approximate 3...
  7. Thread: 404a low temp

    by james mo
    Replies
    12
    Views
    321

    404a low temp

    A little bit of difficulty with a co2 tank refrigeration system. The customer has had multiple problems with tripping on hot days. This is my second visit. First visit I found the machine...
  8. I don't think those units utilize a heat pump...

    I don't think those units utilize a heat pump stat. I am used to seeing conventional t-stats used on those machines.
  9. Replies
    0
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    415

    cleaver brooks cfc750 combustion blower

    Cleaver clearfire boiler will not heat. There is a manual on site for startup and adjustment, but I need some help with diagnosis. I found the boiler on and the combustion blower running full...
  10. Thread: Package unit

    by james mo
    Replies
    13
    Views
    2,739

    Condenser fan rain shield. Right?

    Condenser fan rain shield. Right?
  11. Replies
    16
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    2,999

    Why isn't that tail rotor spinning Tech Rob?

    Why isn't that tail rotor spinning Tech Rob?
  12. Replies
    16
    Views
    2,999

    What size RTU's?

    What size RTU's?
  13. sounds like your pump is pumping to the boilers...

    sounds like your pump is pumping to the boilers and the compression tank is piped to the pump return. 12psig fill pressure + pump pressure is what you are seeing at the boiler. If you pump away from...
  14. this is a great trade, challenging,diverse,...

    this is a great trade, challenging,diverse, necessary, important and most days endwith a great sense of accomplishment.
  15. go out and meet some contractors, ask their...

    go out and meet some contractors, ask their opinion. it sounds corny, but a couple years from now when you're looking for a job, they will probablyremember you. that will make you stand out from...
  16. Replies
    4
    Views
    652

    The only thing that will save the Chiefs is a...

    The only thing that will save the Chiefs is a boycott. Stop paying for the tickets and the owner may be motivated to put together a functional coaching staff and team.
  17. Replies
    34
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    6,812

    Not familiar with the unit, but looks like...

    Not familiar with the unit, but looks like excellent service access to the ductwork and no access to the stuff that needs service access.
  18. Replies
    4
    Views
    652

    RTUA 100 fan control bias

    I was checking the service settings on this R-22 machine and found a setting for fan control bias (-50 to +50) Default setting in the IOM is 0 and this machine is set to +2. The IOM doesn't explain...
  19. Replies
    1
    Views
    950

    AAON RN with mini module

    16 control voltage conductors and a 4 page module installation guide without any operation or setup information. thank goodness for the internet, because tech support had me on hold for 45 minutes...
  20. you reduce the return static pressure by pulling...

    you reduce the return static pressure by pulling the filters up. if you are using pleated filters try using standard filters. proper air flow is more important then filtered air
  21. Replies
    31
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    9,286

    I worked for an 80/20 resi/commercial company...

    I worked for an 80/20 resi/commercial company that I loved. The management held quarterly meetings to present actual financials and create a team environment. Bonuses were given to encourage sales,...
  22. Replies
    10
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    1,772

    Is that the x-13 motor or the ecm?

    Is that the x-13 motor or the ecm?
  23. Replies
    2
    Views
    1,109

    They are using the 7/8 inch pipe as a distributor...

    They are using the 7/8 inch pipe as a distributor and the cap tubes are pushed through an inch and a half so they do not get filled will sil-fos while brazing. Another member here...
  24. Replies
    6
    Views
    1,158

    It means that the high temp limit tripped in heat...

    It means that the high temp limit tripped in heat and the control adjusted the fan delay off time
  25. Replies
    14
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    2,787

    Line voltage wires lying on a discharge...

    Line voltage wires lying on a discharge line..........
  26. Thread: P-66 or motor

    by james mo
    Replies
    7
    Views
    1,011

    Is the 24vac control voltage present?

    Is the 24vac control voltage present?
  27. Thread: Frustrated

    by james mo
    Replies
    20
    Views
    2,579

    If you are doing work for walmart, quote the 4...

    If you are doing work for walmart, quote the 4 hours and let the next contractor on the list make their own decision. Sometimes it works out to do a favor and play by the customer's time estimate,...
  28. Replies
    29
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    2,498

    Call a coil manufacturer and have them come out...

    Call a coil manufacturer and have them come out and check the coil size, piping and fin spacing. Let them tell you what the capacity of the coils are.
  29. Replies
    29
    Views
    2,498

    Split system...410a retrofit?..condenser higher...

    Split system...410a retrofit?..condenser higher than the evap...oil logged evap due to piping or residual mineral oil?
  30. Replies
    16
    Views
    2,650

    Mammoth unit with 3 Fu-sheng modulating screws. ...

    Mammoth unit with 3 Fu-sheng modulating screws. The lead compressor has hot gas bypass for low load situations. The compressor has a large discharge/oil separator on it, but oil level still drops a...
  31. Replies
    13
    Views
    4,155

    PaysonHvac...http://hvac-talk.com/vbb/showthread.p...

    PaysonHvac...http://hvac-talk.com/vbb/showthread.php?t=150745&highlight=trane
  32. Replies
    55
    Views
    6,590

    I found a source for rebuilt controls when I was...

    I found a source for rebuilt controls when I was in a spot looking for a Honeywell 7100f discharge air controller for modulating screws. No longer made and none in stock anywhere. I found this...
  33. Replies
    2
    Views
    540

    I have quit using the AAF brand of pleated...

    I have quit using the AAF brand of pleated filters for those reasons. I don't know if that is what you have been using.
  34. Replies
    20
    Views
    1,952

    install a honeywell intermittant ignition...

    install a honeywell intermittant ignition retrofit kit.

    Brand New Honeywell Y8610U4001 Universal Intermittent Pilot Retrofit Kit

    Complete retrofit kits for converting conventional standing...
  35. Thread: Pyrotecknics

    by james mo
    Replies
    6
    Views
    808

    Found this Red: any Strontium salt like...

    Found this

    Red: any Strontium salt like Strontium carbonate, Strontium nitrate, and Strontium sulfate. It's commonly found in road flares so if you have one, gut it.

    Orange: calcium chloride....
  36. Replies
    9
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    1,848

    It looks like the furnace top is capped with...

    It looks like the furnace top is capped with ductboard with 4" supply pipes coming straight off of the top.
  37. Replies
    9
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    7,562

    I would expect poly to need changing more often...

    I would expect poly to need changing more often because there is less surface area than 2" pleats.
  38. Replies
    15
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    5,937

    I hate to hear stories like this because that has...

    I hate to hear stories like this because that has always been a reliable control. Why change stuff just to incorporate a blinky light that tells you what you can test for easy enough? Sometimes it...
  39. Thread: Hmmmm?

    by james mo
    Replies
    18
    Views
    3,544

    They probably drilled the hole first thinking the...

    They probably drilled the hole first thinking the drain line was vapor locked and then realized that the tee was on the wrong side/not capped. Pro fix though, Easy access gooey clean out plug.
  40. Replies
    7
    Views
    2,526

    I saw them extensively in Arizona. They were...

    I saw them extensively in Arizona. They were rooftop over/under horizontal duct discharge units.
  41. Replies
    99
    Views
    14,747

    Trane 120 hp chiller on roof of 8 story building...

    Trane 120 hp chiller on roof of 8 story building downtown. Compressor was shipped to shop 2 weeks before job...60 ton recip. Everything happened in a hurry because it was downtown and the street...
  42. Replies
    15
    Views
    1,923

    I'll bet they draw slightly over fla stamped on...

    I'll bet they draw slightly over fla stamped on the side of the motor. Most of the Aaon condenser fan motors I see run well into the service factor.
  43. Replies
    5
    Views
    693

    No, the valve body that mounts to the top of the...

    No, the valve body that mounts to the top of the compressor


    lunchbox, thanks for the reply...I did find, remove and clean one screen, but it was the only one I saw. I guess I should slowly...
  44. Replies
    5
    Views
    693

    Trane screw capacity control problem

    Trane RTUA100. Checked the chiller while I was on site doing something else and found both compressors running. A at 54% and B at 97%. B was trying to unload. Verified the clicking noise to be the...
  45. Good post. Took me less than 2 minutes to see my...

    Good post. Took me less than 2 minutes to see my dates of certifications and the prompt to purchase a replacement card from the esco institute. There is a link on the top right of the home page for...
  46. Replies
    1
    Views
    720

    AAF air filters

    One of our parts suppliers has a rewards program, so I started ordering filters from them. They use AAF perfect pleat filters for the 2" pleated media. I have never seen a lower quality filter. ...
  47. Replies
    5
    Views
    1,026

    RTU insulation

    I have multiple Carrier RTU's I maintain and the insulation is coming off the inside doors and panels throughout the machines. I can re-insulate these panels, but I was wondering if this was common...
  48. Replies
    3
    Views
    566

    It is

    It is
  49. Replies
    3
    Views
    566

    aop commercial

    How about a pro commercial (non-aop) forum. I never did understand why the commercial forum was open to those not in the trade. The aop is a great idea, but we lost a commercial based forum for...
  50. Replies
    24
    Views
    4,484

    disable the blower and see where the lines start...

    disable the blower and see where the lines start to freeze first. That will be where your pressure drop will be. No temp drop over the liquid line drier does not prove a clear line drier. Make it...
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