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  1. Replies
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    1,968

    You didn't post enough info to say for certain...

    You didn't post enough info to say for certain but I bet the root problem still exists. If I were to take a wild guess I would say that the super heat on that system was about zero and you were...
  2. Thanks Rundawg! Yes that exactly what I had...

    Thanks Rundawg! Yes that exactly what I had found and was coming back to post. I had not found that Sustainable Coils might be able to help me. I had resigned myself to starting early one morning...
  3. Replies
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    623

    I usually agree with PHM - but not this time. A...

    I usually agree with PHM - but not this time. A piston compressor will rarely equalize thru the compressor because the reed valves prevent reverse flow. If the system can't equalize thru the...
  4. Replies
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    8,926

    I have replaced 1 X13 motor this year (only one I...

    I have replaced 1 X13 motor this year (only one I have installed in the past several years) and 2 ECM motors. Two of the three replacements were right after a thunderstorm so I suspect electrical...
  5. Need info on the manufacturer of an evaporator coil

    I found a leaking coil on a Rheem system (furnace & condenser). The nameplate was barely readable but clearly was not a Rheem coil. Can someone identify the manufacturer?

    Coil model number...
  6. Replies
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    434

    Posted resolution in Pro Forum.

    Posted resolution in Pro Forum.
  7. Replies
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    434

    DCs601C71 Manuals at...

    DCs601C71 Manuals at http://www.daikinac.com/content/commercial/accessories-and-controllers/intelligent-touch-controller-dcs601c71/ There is no 'other' front end.

    I have been digging thru those...
  8. I read about those in the old Doolin...

    I read about those in the old Doolin Troubleshooting Bible (mine was about a 1970's version). I had never actually seen one though. I recently (2005) ran across a could of them on a museum. They...
  9. I thought most of the very old refrigeration rack...

    I thought most of the very old refrigeration rack systems were a kind of VRF system. Those that ran a compressor to charge a liquid receiver and then cycled off the compressor. Then the...
  10. Replies
    6
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    434

    I checked the Advanced menu but wasn't able to...

    I checked the Advanced menu but wasn't able to change it there. You may have hit on the problem. Is there something I need to do to make the factory default inactive?
  11. Replies
    6
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    434

    iTouch Programming Question

    I have what should be a simple problem that I can't find an answer. On a Daikin iTouch system I need to raise the heating set point to 70. Currently it is limited to 68 by the controller. I can't...
  12. Replies
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    17,422

    Do you have similar pictures on flex duct systems?

    Do you have similar pictures on flex duct systems?
  13. Replies
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    3,815

    This installation is on a museum so down time is...

    This installation is on a museum so down time is critical. Add that budgets are non-existent at the moment. I don't think vibe analysis is going to show much without a baseline. Oil sample might...
  14. Replies
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    3,815

    Oil Migration problem on Carrier 23XL Chiiler

    I did a search before posting this but didn't find anything -

    We have a 225 ton Carrier 23XL chiller. It was installed new about 1996 when it replaced one of two 175 ton Carrier 19DG chillers. ...
  15. Replies
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    1,546

    I would bet that most of these were shown on the...

    I would bet that most of these were shown on the drawings and the person in charge rejected the change order. So they built what was on the drawings.
  16. Replies
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    1,509

    EXACTLY like the Cornwell. I bet they were the...

    EXACTLY like the Cornwell. I bet they were the company that made them for Craftsman.
  17. Replies
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    1,509

    I was looking for the box that held about 7 or 8...

    I was looking for the box that held about 7 or 8 sockets - nothing else. The entire set in the box was about 4" long x 3/4" wide x 1" tall. I'm guessing on the dimension since I don't have the set...
  18. Replies
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    1,509

    That's what I was hoping for! Somebody knew...

    That's what I was hoping for! Somebody knew where I could find replacements. I'll hit the NAPA store tomorrow.

    My truck was sitting in my driveway at my house. My driveway is a good way from...
  19. Replies
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    1,509

    Stolen tool pouch

    My tool pouch/belt was stolen out of my truck a few nights ago. I have had the pouch since I was in high school in the 1970's. I have tried to replace it a few times but always went back to the old...
  20. Replies
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    641

    Change Summit to not report that error until it...

    Change Summit to not report that error until it has existed for 5 minutes. That doesn't fix the problem, but at least you don't have to look at it so often.
  21. Replies
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    4,160

    Two words, two words I say Freeze stat...

    Two words, two words I say




    Freeze stat ;)
  22. Replies
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    920

    If you want to do it the hard way - the ARI web...

    If you want to do it the hard way - the ARI web site has some equations in one of the online publications that are used to predict performance at different conditions.

    If you want a somewhat...
  23. Replies
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    1,052

    This is an age old argument with good points on...

    This is an age old argument with good points on both sides. I agree with the comment about filters are needed at the unit even with filters in the return grill. One good point about return grill...
  24. Replies
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    1,210

    You forgot one of the most important parts. The...

    You forgot one of the most important parts. The owner hired an architect - probably based on the qualifications of that architect. Then the architect hired the engineer. Probably based on the...
  25. Replies
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    121,713

    RS Means has some 'rule of thumb' for sq ft per...

    RS Means has some 'rule of thumb' for sq ft per ton. But since they don't say what climate they apply to I think they are a way to get yourself in trouble. Just how many bowling alleys in Alaska...
  26. Replies
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    1,731

    Pneuma is right about the depth of the trap. If...

    Pneuma is right about the depth of the trap. If you increase the diameter and the problem gets better, the trap isn't working right anyway. Only depth will make the trap work right with water. ...
  27. Replies
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    1,731

    Turn the blower off before you prime the trap. ...

    Turn the blower off before you prime the trap. Otherwise the "prime" goes into the unit as fast as you pour it. It never develops the trap seal.

    If you are still having trouble, measure the...
  28. Replies
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    2,494

    You are right - this may turn into a complete...

    You are right - this may turn into a complete redesign and replacement of lots of equipment. But until the decision makers decide that, they want problems identified and corrected.
  29. Replies
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    2,494

    Turns out Carren #2 was right - I was being a...

    Turns out Carren #2 was right - I was being a bone head. I just needed to put it down for a few minutes so I wasn't focused on the bypass valve itself. I should be able to measure the CHWR...
  30. Replies
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    2,494

    The problem is they want to pull the chillers out...

    The problem is they want to pull the chillers out of this building completely and go on a district chilled water plant. That way they will buy chilled water for cooling instead of buying electricity...
  31. Replies
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    2,494

    I'll post this one in the "Food" forum next. But...

    I'll post this one in the "Food" forum next. But until then could you tell me how the discharge air temperature will tell me if the chilled water bypass is open or closed? Obviously I have missed...
  32. Replies
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    2,494

    CHW Bypass valve check

    I need to check some three way bypass valves to see if the bypass is working or not. The original install was a bypass three way valve on many of the cooling coils. A retrofit a few years later was...
  33. Replies
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    7,268

    Some of those are "precharged" linesets made for...

    Some of those are "precharged" linesets made for DIY installation. If you cut the lineset, it isn't DIY anymore.
  34. Replies
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    650

    Most codes require 10 ft horizontal separation or...

    Most codes require 10 ft horizontal separation or 3 foot below the odor source. You might be able to add height to that vent thru roof to get the clearance you need.
  35. Replies
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    9,185

    Copper is allowed for natural gas in some...

    Copper is allowed for natural gas in some locations. But where I am the gas corrodes the inside of the copper.

    Look up the gas line sizing in your code book. The NFG, mechanical, and plumbing...
  36. Replies
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    879

    Rather than try to tell you how to calculate the...

    Rather than try to tell you how to calculate the pressure - google "Contam" You should be able to download that program and run it to get a good answer.
  37. You need to get a copy of ASHRAE 62.1. Table 6-1...

    You need to get a copy of ASHRAE 62.1. Table 6-1 shows for "Places of religious workshop" (sic) the ventialtion should be 5 cfm per person PLUS 0.06 cfm per square foot. Then you would apply...
  38. Replies
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    2,135

    Listen to Carnak - he seems to be pretty good at...

    Listen to Carnak - he seems to be pretty good at predicting the future ;)

    Ball park kind of numbers -

    1) You want the supply air DEW POINT leaving the unit to be the same as the dew point you...
  39. Replies
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    4,375

    If it is zoned, the 3 ton system may be enough. ...

    If it is zoned, the 3 ton system may be enough. But she needs someone local who can look at the actual installation.
  40. Replies
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    4,375

    What he is trying to say is that with a 2 stage...

    What he is trying to say is that with a 2 stage system it is not oversized because the 2 stage unit can back down to 1st stage. But the first stage is between 60% and 80% of the 2nd stage capacity...
  41. Replies
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    861

    If you are only exhausting 380 cfm - there isn't...

    If you are only exhausting 380 cfm - there isn't enough "lost" energy to worry about recovering. The cost of the wheel and installation isn't likely to ever payback. But that's just my opinion.
  42. I would use the ASHRAE 62.1 rates for banks.

    I would use the ASHRAE 62.1 rates for banks.
  43. Replies
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    11,310

    Round or rectangular or square doesn't make a...

    Round or rectangular or square doesn't make a difference to the air flow. Pick what ever works for the space you have available.

    But if you have a 100 year old farm house you probably have all...
  44. Replies
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    1,763

    Maybe someone can explain this to me. When I go...

    Maybe someone can explain this to me. When I go into a C-store after filling my truck with $4.00 a gallon gas I see bottled water for $1.00 a quart. Isn't that the same as $4.00 a gallon?

    Hmm,...
  45. Replies
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    952

    jorgas, Be warned that LEED EB is right in the...

    jorgas,

    Be warned that LEED EB is right in the middle of a change. There is a new version out on the USGBC web site but they don't have the books for the new version yet (as of May 2008 anyway). ...
  46. Replies
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    2,054

    Let's see what else it could be - 1) Engineer...

    Let's see what else it could be -

    1) Engineer did load calcs for R30 roof insulation and R19 was installed.
    2) Engineer did load calcs for R30 roof insulation and R30 was installed with so many...
  47. Replies
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    640

    You need to be a LOT more specific. R409 was/is...

    You need to be a LOT more specific. R409 was/is a replacement for R12. Did the unit originally use R12 or was it always R409? The old oil could be just about anything. Some of the refrigerants...
  48. Replies
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    2,177

    If you google it you should find where people...

    If you google it you should find where people have written about auto tuning loops. You can manually do the same thing even if your equipment won't auto tune.
  49. Replies
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    684

    We are seeing the SNVT leave the TAC system. But...

    We are seeing the SNVT leave the TAC system. But we have no way to see what arrived at at the Trane side. Rover doesn't recognize there is anything on the comm link - probably because TAC had to...
  50. Replies
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    684

    Using Lon with different vendor's systems

    Got a problem between TAC controls and Trane RTU's communicating with Lon. I need to shut down the blower on high RH in the space. TAC controls guys say they ARE sending the Lon command to shut...
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