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  1. Thanks for the info. I just downloaded some...

    Thanks for the info.

    I just downloaded some data logs on three of the RTUs. The OA damper never closes. The blowers never turn off. On two of the units one compressor is running continuously...
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    I have seen things like this. Usually it is due...

    I have seen things like this. Usually it is due to a failed duct leak test. The installer is sure his ducts aren't leaking so he seals everything else up to "prove" his ducts weren't the leak. ...
  3. Model YHD150F3RLB0E0F Serial 143011092D And...

    Model YHD150F3RLB0E0F Serial 143011092D And there are 4 more RTU of different sizes.

    It is a newer RTRM board with the CTI built in. It has a conventional 2-stage programmable thermostat hooked...
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    You must be as old or older than I am.

    You must be as old or older than I am.
  5. I found the Reliatel Control book. Page 46 and...

    I found the Reliatel Control book. Page 46 and 47 seem to confirm what I was seeing / thinking about the conventional t/stat control.
  6. Trane Voyager Controls with conventional T/stat Question

    I need some help understanding what the Trane Voyager controls do when a conventional thermostat is used to control the unit.

    I have looked up the Trane "black book" and read thru it. My...
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    Thanks for the link @jayguy. That is just what I...

    Thanks for the link @jayguy. That is just what I was looking for.
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    I just saw this because I'm looking for something...

    I just saw this because I'm looking for something similar but 20 tons. For humid areas like Austin make absolutely sure you use enthalpy control. Dry bulb control will make the space extremely...
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    1,665

    I saw the 550 advertised for what I thought was a...

    I saw the 550 advertised for what I thought was a great price and ordered it. I looked on line and there was a 4 valve manifold but it didn't offer some of the features I wanted (like blue tooth...
  10. Thread: Hose gaskets

    by cxagent
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    6,972

    I used to replace the gaskets when they leaked or...

    I used to replace the gaskets when they leaked or looked like they might leak. Then I was working on a roof when it rained on me while I was charging a unit (about 1978 or so). I saw all kinds of...
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    2,648

    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...
  12. 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...
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    829

    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...
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    13,508

    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...
  15. 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...
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    553

    Posted resolution in Pro Forum.

    Posted resolution in Pro Forum.
  17. Replies
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    553

    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...
  18. 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...
  19. 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...
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    553

    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?
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    6
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    553

    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...
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    18,387

    Do you have similar pictures on flex duct systems?

    Do you have similar pictures on flex duct systems?
  23. Replies
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    4,476

    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...
  24. Replies
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    4,476

    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. ...
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    1,683

    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.
  26. Replies
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    1,817

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

    EXACTLY like the Cornwell. I bet they were the company that made them for Craftsman.
  27. Replies
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    1,817

    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...
  28. Replies
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    1,817

    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...
  29. Replies
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    1,817

    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...
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    719

    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.
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    4,484

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

    Two words, two words I say




    Freeze stat ;)
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    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...
  33. Replies
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    1,222

    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...
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    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...
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    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...
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    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. ...
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    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...
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    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.
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    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...
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    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...
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    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...
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    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...
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    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.
  44. Replies
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    681

    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.
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    9,690

    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...
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    992

    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.
  47. 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...
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    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...
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    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.
  50. Replies
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    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...
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