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  1. Water test shows a ph of 8.3 Reserve...

    Water test shows a ph of 8.3

    Reserve alkalinity of .3 mL HCI

    They're saying the low reserve alkalinity indicates that the inhibiter is depleted or non-existant.

    PG% = 44.4%

    The report...
  2. Good point. I was wondering what the DP should be...

    Good point. I was wondering what the DP should be set to. It's actually running about 15 psi now. The pump VFDs never go below 60 hz. I was thinking around 6-10 psi, but I haven't ha a chance to...
  3. This company is really good to work for. They...

    This company is really good to work for. They trust our judgement and are open to whatever suggestions we bring forth, short of replacing $10,000 worth of 1 year old control valves that are still...
  4. Still waiting on the results of the water test to...

    Still waiting on the results of the water test to see what we're going to do.
  5. There's an idea. I'll replace them all with...

    There's an idea. I'll replace them all with Belimo CCVs!
  6. We are a mechanical & controls contractor, and we...

    We are a mechanical & controls contractor, and we have the PM agreement with the end user. We didn't do any of the install on this project. We have no problem sourcing the valves. I'm just trying to...
  7. Several New Siemens Globe Valves sticking shut???

    We have a site with approx 25 VAVs that was installed slightly over a year ago. In the last month we've discovered a total of 5 terminal units not heating due to the reheat valves sticking shut. The...
  8. Im not understanding (or maybe you're not...

    [/QUOTE]Im not understanding (or maybe you're not clear on the question)? I need to interlock the heater with a separate exhaust fan, so that if there is no air being exhausted the heater shuts...
  9. Replies
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    I fought a problem like this with an aaon a...

    I fought a problem like this with an aaon a couple years ago. I ended up installing a few tattle tales on suspect devices like low/high pressure switches. In my case it ended up being a loose wire...
  10. I'm not sure exactly what type of heater you're...

    I'm not sure exactly what type of heater you're using, but I think you could look at pulling a signal right off the gas valve.
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    Oh YES! My favorite! Now that'll keep you busy...

    Oh YES! My favorite! Now that'll keep you busy for while.
  12. Replies
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    1,406

    Don't worry about it. Those were superceded to...

    Don't worry about it. Those were superceded to the new .10" rating months ago. Some of the old ones were .18" some were .15" they all get a .10" now.
  13. Thread: Trusteam!!!

    by dunkman
    Replies
    16
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    1,397

    Why not 12 gallon units?

    Why not 12 gallon units?
  14. Try having 3 new Hydron units in the same job...

    Try having 3 new Hydron units in the same job that had bad reversing valves. They sent 3 new valves, all of which also failed within days. We had to build up sil-fos on the reversing valve pilot...
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    2,380

    I've seen this happen when the wires going to the...

    I've seen this happen when the wires going to the economizer plug were squished between the blower housing and the top of the unit, rubbing through the common 24v wire. That'll make all the...
  16. Replies
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    7,544

    Ha! Aren't they all???

    Ha! Aren't they all???
  17. LIEBERTS! Why didn't somebody say that before?...

    LIEBERTS! Why didn't somebody say that before? Now I just feel silly. We have a bunch of those around here, none are ducted units though.

    Total of 15 tons, I wonder if you're short on capacity....
  18. Forgive me, I'm trying to understand. Do you mean...

    Forgive me, I'm trying to understand. Do you mean the sensor is in the exhaust of the servers, or by "exhaust ducts" do you mean the cold air supplies?

    BTW, what's a Challenger?
  19. Replies
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    7,544

    Thank you for this thread, it's been educational.

    Thank you for this thread, it's been educational.
  20. Actually the new cabinets are pretty tight. Also...

    Actually the new cabinets are pretty tight. Also insulated better than the old metal ones, less problems with condensation on the cabinet.
  21. So it senses the same temperature that operates...

    So it senses the same temperature that operates the cooling equipment.

    Where is the thermostat now?
  22. I would have the sensor next to the cooling...

    I would have the sensor next to the cooling thermostat.
  23. Replies
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    9,007

    All I've ever done with these systems is connect...

    All I've ever done with these systems is connect with hyperterminal through the N30 to manage settings, check sensors, etc. I wouldn't mind knowing how to fix program issues on the UNT controllers.
  24. You talking about a City Multi? Try a search on...

    You talking about a City Multi? Try a search on that.
  25. Replies
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    2,155

    I just checked with myself, and myself concurs...

    I just checked with myself, and myself concurs that i use the same manifold on everything. Just be sure to purge the liquid from your high side hose back into each system before removing.

    Then...
  26. Replies
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    3,184

    What does it do if you plug your hoses and hook...

    What does it do if you plug your hoses and hook it up to the vac pump?

    With both hi & lo side open pressure up with some nitrogen and watch to see if both transducers read the same as you fill it...
  27. Your tech needs to focus on the indoor blower...

    Your tech needs to focus on the indoor blower motor and low voltage wire connections .
  28. Replies
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    1,861

    Those numbers seem kindof weird, maybe get an...

    Those numbers seem kindof weird, maybe get an opinion from another meter? You should also check the CC heater to ground, if it has one. Also check each winding to ground.

    BTW to address your...
  29. Replies
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    2,207

    I would definately have a blower door test done...

    I would definately have a blower door test done on this house to see how leaky it is.
  30. It's a ball valve.

    It's a ball valve.
  31. Replies
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    Maybe dirty? Or maybe it could possibly be...

    Maybe dirty?


    Or maybe it could possibly be slightly miss matched all to hell!
  32. 10 deg delta is too low on 1st stage. I wonder if...

    10 deg delta is too low on 1st stage. I wonder if your fan is set up right? WHen you set the stat to fan on, then put on 1st stage cooling, is there a difference in the fan speed? It should remain at...
  33. Thread: Manifold hoses

    by dunkman
    Replies
    24
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    2,722

    I do a lot of 410a. I just blew another lowloss...

    I do a lot of 410a. I just blew another lowloss on the high side. Just have to rebuild em every 2 months in the summer. Oh yeah, summer's only 3 months here anyway... I like the lowloss, they don't...
  34. Personally, I have an TUH2B060 with a 2 ton a/c....

    Personally, I have an TUH2B060 with a 2 ton a/c. I run it at 50% continuous, 2.5 ton airflow, comfort-R on. I do it that way to get a little more sensible cooling, since I have to run a stand alone...
  35. Replies
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    2,797

    I didn't mean that you were necessarily...

    I didn't mean that you were necessarily undercharged in your case. Just sharing general knowledge. You can tell what your condensor efficiency is by the liq line temp-oat (approach temp)

    Could it...
  36. Replies
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    2,797

    Tough when it's 110 Oat. ouch. On a 30 year old...

    Tough when it's 110 Oat. ouch. On a 30 year old unit you have a relatively small condensor coil so you get higher temp splits across the condensor. Your liq line temp should be around what.... 10-15...
  37. Replies
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    1,972

    Not fatal, may even go away some day. Until you...

    Not fatal, may even go away some day. Until you can pinpoint exactly where it's coming from I wouldn't recommend any corrective action.
  38. Replies
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    I read somewhere at one time that r410a has a .3...

    I read somewhere at one time that r410a has a .3 deg F temp glide, not even detectable with standard instruments.
  39. Replies
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    2,353

    I agree. 7/8" will keep the velocity up,...

    I agree. 7/8" will keep the velocity up, providing better oil return which is important, especially since it is 2 stage, and will probably spend the most hours in 1st stage.
  40. Poll: I just grabbed a couple cans out of the cage and...

    I just grabbed a couple cans out of the cage and noticed we actually have 1000 lbs in 125# cylinders, plus a half pallet of 30's left. We have a dozen HVAC/R service techs in our company. It sounds...
  41. Replies
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    Well, now that you mention that it's a scroll,...

    Well, now that you mention that it's a scroll, that is peculiar. I don't ever remember having encountered this before, except on a Bristol recip in a Carrier RTU. It sounded like someone letting the...
  42. Replies
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    1,972

    You'll have to have a trained ear listen to it....

    You'll have to have a trained ear listen to it. If it's not fan motor bearings, it could be valves in the compressor leaking.
  43. Replies
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    You need to check superheat/subcooling.

    You need to check superheat/subcooling.
  44. Replies
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    6,151

    You have to change the txv? Maybe that would...

    You have to change the txv? Maybe that would explain why we had higher than usual superheat on the 2 conversions we did. The instructions I saw only said to change out the valve cores and...
  45. Either your measurements are inaccurate or it's...

    Either your measurements are inaccurate or it's not pure refrigerant.
  46. The book will have the fault codes. The 11 flash...

    The book will have the fault codes. The 11 flash means there's a fault on the EEV board I think? looks like the EEV board is giving you a 4 flash and a 7 flash. I don't think those faults will clear...
  47. Poll: We keep 1 pallet on hand plus 3 or 4 hundred...

    We keep 1 pallet on hand plus 3 or 4 hundred pounders. But we use about 2 pallets a year at least... We also send back quite a bit for recycling.
  48. Replies
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    We have 5 or 6 of them in our trucks. I haven't...

    We have 5 or 6 of them in our trucks. I haven't heard of any problems yet. Never used an H-10 so I can't speak to that. Your inficon REP sounds more like a salesman, probably don't know what the hell...
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    You mean these marvels of engineering?

    You mean these marvels of engineering?
  50. Replies
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    3,403

    Dtek select. I love it. Super sensitive, put it...

    Dtek select. I love it. Super sensitive, put it over a small 410a leak and it beeps. I don't know what makes it work, but it sure works.
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