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  1. Replies
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    OP here: I was able to get up and seal off the...

    OP here: I was able to get up and seal off the economizers with tape as an experiment. The last row of tape that went on, was sucked into place; so it was obvious that *some* amount of air was...
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    OP here: I have more data - it was about 81F...

    OP here: I have more data - it was about 81F outside today, and I made the following readings. RH both inside and out is about 50%.

    Evap: 80F inlet 62F output Delta:18F

    Cond (RTU...
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    OP here: Thanks for the info! Agreed: This...

    OP here: Thanks for the info!

    Agreed: This Trane Precident 10 ton unit isn't designed for server-room cooling; I've been told that, but the powers-that-be won't be spending another $25k on new...
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    Correct, the walls were just extended up to the...

    Correct, the walls were just extended up to the roof deck about a month ago. so that's what I meant by 'closed loop' in my earlier post. Also yes, the top of the plenum is essentially the steel...
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    I can clarify -- sorry... The supply is ducted...

    I can clarify -- sorry... The supply is ducted into the conditioned space by 24" flex-ducts that hang off of a 18 X 40 supply trunk. --Its fed in below the drop-ceiling. There is grating in the...
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    OP here.. The space has no exterior walls, the...

    OP here.. The space has no exterior walls, the room has conditioned space all around it. The roof has those white rocks on top of a tar roof. In the mid-Atlantic area, we've been having much...
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    Is this Trane RTU overcharged?

    Greetings;

    I have the ear of the landlord's HVAC guy, but wanted to see what the experts here thought of my situation. I have a 10-ton Trane Precedent unit on the roof; filters are clean, and...
  8. OP here: I agree that 'something changed', and...

    OP here: I agree that 'something changed', and we either have to get HVAC people in here, or force the landlord to get his manifold out & check out the system.

    Our temperature in the...
  9. OK.. Looks like we're done here... I'm stuck in...

    OK.. Looks like we're done here... I'm stuck in the middle with my little graphs, trying to find out & prove what's wrong.. I'm trying to get it fixed, where the landlord wants to do as little as...
  10. I'm struggling with Excel right now to build a...

    I'm struggling with Excel right now to build a graph that is indexed by time/date, rather than showing 0d 1d 2d (showing number-of-days-ago), because that's confusing. I think I'm noticing an...
  11. More news.. the Building HVAC guys probably...

    More news.. the Building HVAC guys probably unplugged the economizer, because the supply temp doesn't do that saw-tooth up/down action when 60F is reached. so, we're not bringing in any OSA...
  12. The Sr. building technician, and the expert on...

    The Sr. building technician, and the expert on the Trane controls just visited; these are the two experts in our landlord's company who deal with all HVAC issues. I got the lecture about a 10ton...
  13. OP here: Thanks for the responses -- I have...

    OP here: Thanks for the responses -- I have more new info. The landlord came out, and we talked, and he let me watch him play with the computer system that controls all the Trane RTUs. Real...
  14. Our landlord does indeed have an HVAC person, but...

    Our landlord does indeed have an HVAC person, but that's the issue; they're being non-responsive at the moment. The current 12-ton unit was manufactured in 2012 according to the sticker on the side...
  15. OP here: Thanks for the info.. the red Pressure...

    OP here: Thanks for the info.. the red Pressure Sensor was mounted on one of the huge air-handlers for the building-space actually -- it's not mounted on my 12-ton unit for the Server Room. A...
  16. Loonie -- You're preaching to the choir - I know,...

    Loonie -- You're preaching to the choir - I know, and my facilities people know that the unit we have is not designed for low-temp / Server room applications. However, it's what we have, so we just...
  17. We tried 68F as the setpoint, but that just...

    We tried 68F as the setpoint, but that just indicates the temp of the ambient air. The air inside the racks of equipment was significantly warmer, and we were getting temperature alarms at some...
  18. Indoor temp correlates with outdoor temp ONLY in warmer weather...

    I've got a question on the behaviour of a commercial unit at my workplace. It's a 12-ton Trane Precident rooftop unit with model number THC120E4R0A0DH0C1 (manufactured in late 2012). The landlord...
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    It was barely visible on the mfgr's tag, but the...

    It was barely visible on the mfgr's tag, but the date-of-manufacture was "5-87"
  20. Replies
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    I've never seen an insulated liquid line either. ...

    I've never seen an insulated liquid line either. I've never seen a line-dryer inside either -- does it make much difference where it goes, as long as it's present? The old unit was a 2.5 ton as...
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    Carrier 2.5 ton change out - How's it look?

    Carrier 2.5 ton change-out. My mother's 1987 "oil-drum" Carrier finially stopped working. Sorry for the links -- the "manage attachments" button won't upload anything for some reason. I welcome...
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    Testing 123...

    Testing 123
    http://drive.google.com/file/d/0B6dZ5_Y6NgVyMS1zWW5ZVlNZZmc
  23. Replies
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    Test imbedding again......

    Test imbedding again...
    https://drive.google.com/file/d/0B6dZ5_Y6NgVyMS1zWW5ZVlNZZmc
  24. Replies
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    https://drive.google.com/file/d/0B6dZ5_Y6NgVy...

    <img>https://drive.google.com/file/d/0B6dZ5_Y6NgVyMS1zWW5ZVlNZZmc</img>
    test imbedding
  25. Replies
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    Testing the imbeedding of pictures...

    https://drive.google.com/file/d/0B6dZ5_Y6NgVyQnEzeHZERDhpVkk

    https://drive.google.com/file/d/0B6dZ5_Y6NgVyMS1zWW5ZVlNZZmc

    Enjoy....
  26. Replies
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    Greetings; I've read that the reason why DIY is...

    Greetings; I've read that the reason why DIY is frowned upon, is mainly to avoid liability. This totally makes sense. For anyone who's willing to offer a few words of advice, how do we take a...
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    Thanks for the info -- If this doesn't work, I...

    Thanks for the info -- If this doesn't work, I promise to bring an HVAC person in to work on this --- I'd have no choice...

    -A
  28. Replies
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    According to the documentation that was left...

    According to the documentation that was left behind with the AH, I removed the jumper between R and BK, then installed the Humid. controller there. I also jumped R and O. This is not correct? ...
  29. Replies
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    OP here: Welp, I connected the Humidity...

    OP here: Welp, I connected the Humidity Controller according to the documentation, but it doesn't alter the behaviour of the AH at all. It doesn't spin down to low-fan while the tstat is calling...
  30. Replies
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    OP here: I see. My tech documentation on the...

    OP here: I see. My tech documentation on the AH, says that "Humidistat will be installed between terminals R and BK - Also note that terminals R and O must be shorted for proper blower operation"....
  31. Replies
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    OP here: Thanks -- so the only thing a...

    OP here: Thanks -- so the only thing a dehumidistat will do, is to force low-fan-speed when there's already an existing call for cooling? Will it turn on the compressor along with low-fan-speed...
  32. Replies
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    How does dehumidification work with my AH?

    Greetings;

    With the technical docs that were left behind from my installer, I see that a humidistat can be installed to work with my system. It's not a seperate unit, but some function of the AH...
  33. Replies
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    The one transformer in the A/C AH has a 3A fuse...

    The one transformer in the A/C AH has a 3A fuse on the 24v side, and the transformer for the heat (installed in 1963) has no fuse on the 24v side, except for the 15A breaker on the Primary (120VAC)...
  34. Replies
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    FIXED! (I can't figure out why though, since it...

    FIXED! (I can't figure out why though, since it worked perfectly for 4 years then stopped..) I re-wired the two zone-valves, transformer, and tstats according to a diagram I found on Taco's...
  35. Replies
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    OK - zone valve is rated for 24v and .9A. I...

    OK - zone valve is rated for 24v and .9A. I compared upstairs zone-valve, which works perfectly.

    Upstairs:
    25.1v coming from transformer
    dips to 21v when valve is opening, and is pulls .91A

    ...
  36. Replies
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    'Fried' was my word I guess... What I've...

    'Fried' was my word I guess... What I've diagnosed, is that when the Tstat closes its relay, which should send 24v to the zone-valve; there's no voltage. If I bridge R and W on the Tstat, voltage...
  37. Replies
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    Question: The "R" and "Rc" terminals on a Tstat...

    Question: The "R" and "Rc" terminals on a Tstat are where the 'hot' line from the transformer connects. Rc is power-for-cooling. Does this mean "R" is the power for heat? Is this how a Tstat...
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    the Tstat for downstairs is the one that died. ...

    the Tstat for downstairs is the one that died. The upstairs Tstat is a Honeywell item from ~2002 (programable), but it doesn't go 'click' when a call for heat is made. This older Tstat is working...
  39. Replies
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    Fuse is still intact - I still see 28VAC at the...

    Fuse is still intact - I still see 28VAC at the Tstat. I could swap the two zone valves to see if the problem follows the valve - but that's an expensive fix; because it fries an $80 Tstat.

    For...
  40. Replies
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    There's a 5A automotive-type fuse that powers the...

    There's a 5A automotive-type fuse that powers the transformer. I think I left something out -- when the Tstat calls for heat, and closes the ckt for heating, the current routes thru one of those...
  41. Replies
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    Burning up a Tstat??

    Can I get a professional opinion? I've been running just fine for 4 years with a Honeywell CT3500 Tstat. Just before Christmas my furnace stopped coming on. I traced this to the fact that the...
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    The old boiler (from pics of the nameplate) ...

    The old boiler (from pics of the nameplate)

    Federal Boiler model GFS-17. AGA input 175K AGA output 140K net output 123K The house was built in late '64, into '65. Boiler was working fine --...
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    Question: That smaller horizontally-mounted...

    Question: That smaller horizontally-mounted expansion tank has wording on it, that says it's for domestic hot water expansion. BUT: The tank is definitly on the cold-water input to the tank. Do...
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    Late-breaking news -- one of the union...

    Late-breaking news -- one of the union connections right in front of where they cemented over the flue opening started leaking, and put a puddle on the floor, that was about 10feet in diameter. The...
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    mech_head said: C'mon, tell the truth, you knew...

    mech_head said: C'mon, tell the truth, you knew going in you were going to post this here didn't you?
    _______________________________

    Oh yea, had the camera ready on this one..

    The PVC...
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    1965 Federal Boiler Replacement (Weil McLain)

    Had to have the old 1965 Federal Boiler replaced.. (Baseboard & Domestic hot water) The only requirement was that it be direct-vented - we recently found out, from a recent PM, that the flue was...
  47. Thread: Picture U/L test

    by alexb
    Replies
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    1,800

    Picture U/L test

    Test to see if I can U/L a pic...


    Before caption........
    http://mysite.verizon.net/batsona/OldBoilerLeft.JPG
    After caption........
  48. Replies
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    Thanks for the words of wisdom. I do recognize...

    Thanks for the words of wisdom. I do recognize that the mfgr. is claiming to reduce the temp. swings by altering the current being fed to the element, which is apparently their claim-to-fame.
    ...
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    Experience with HydroSil elec baseboards...

    I saw an ad recently for HydroSil elec. baseboard heaters. My house needs some supplemental heat, and HydroSil's "proportional" metering systems delivers just enough current to the element to...
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    I think I know the answer to this, but I'll ask...

    I think I know the answer to this, but I'll ask anyway. Some heaters are called "power-vent", meaning they have the elec. motor & vent fan that sits on top. Does that type of setup *require* the...
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