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  1. Spray foam, i'll bet you're an artist. I make a...

    Spray foam, i'll bet you're an artist. I make a mess with that stuff, but it does clean-up a gappy hole pretty darn quick.
    - i'm glad i'm not the only one who doesn't think heat tape is excessive in...
  2. 30*F Walk-in Fridge, condensate heat tape?

    Does a 30*F fridge require heat tape on the condensate line?

    Suction line securing with strut, is it better to leave horizontal lines loose, or anchored down with strut clamps?

    How deep does a...
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    measure the facce velocity infront of the coil,...

    measure the facce velocity infront of the coil, if it's over 500fpm you are certainly sucking it off the coil.
    good point about condensate venting, low side (static) vents need to be on the leaving...
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    198

    APC FM50M water cooled dx 3-way valve

    3-way valve (or actuator) went bad on apc upflow dx, water cooled floor mount unit. m/n FM50M-WKA-XXU. i was handed a box of parts and told replace it.
    no unions installed on 1-1/2 copper to 3 way...
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    1,097

    replacing the blower,

    I'll be doing one of these tomorrow on an FM50M-WKA. thought about removing the left side door and all the electrical associated, but i like the idea about moving the front control panel instead. i...
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    1,020

    sub cool

    thank you for the replies,
    astute observation, maybe osa was below 75*F.
    could over charge be an issue? I read the condenser was built for 5*F SC, should I pull some charge out since i was closer...
  7. Replies
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    1,317

    worked on an rtu last month, condenser fan motors...

    worked on an rtu last month, condenser fan motors had been replaced by unknown mechanic, fan blades were not oem size. the fan blades were 1" smaller in diameter, caused the unit to trip when osa got...
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    good question

    Thank you for the reply, and the great tips.
    I do not know why, but I could never get over 4 amps out of this compressor. I amped it out just below 4 amps. its a 9 RLA pump.
    By head pressure, do...
  9. loving this high jacked post,

    wanted to ask, when replacing cap tubes, at what point due you turn it over to a txv?
    how often do you find the cap tube clogs up again within 24 to 48 hours? do you find a better drier and flush...
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    Not done, I'll return. BTW, why is it so...

    Not done, I'll return. BTW, why is it so difficult to find a full pt chart for 404a? 5*F increments makes dialing in exact numbers a pain.
    left it running like this for now:
    11*F superheat at the...
  11. Replies
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    1,020

    Really good stuff here. thank you all. I just...

    Really good stuff here. thank you all.
    I just burnt in the new TEV, added a port for suction and liquid at the evap. Pressure test before i drag torches to the roof, time for a coffee break.
    i'll...
  12. Replies
    19
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    1,020

    will tecumseh roto lock service valve fit a...

    will tecumseh roto lock service valve fit a copeland compressor?
    are roto locks universal, or specifically made per brand?
    compressors suction service valve is galled at the stem, will not back...
  13. Replies
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    thank you. the tev i chose is externally...

    thank you.
    the tev i chose is externally equalized.
    So, is the 3*F split across the coil, and 80*F compressor superheat suspect?
    IF so, where do you suggest I start after I cofirm subcooling...
  14. Replies
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    1,020

    Evap is 7,100 btu. Sporlan TEV KT-43-RZ LRC Coil...

    Evap is 7,100 btu. Sporlan TEV KT-43-RZ
    LRC Coil Co m/n SLE7100
    Copeland Condenser CS14K6E-TF5-273
    Compressor FJAL-A200-TFC-001
    box is about 8'x4'

    what are common causes for low evap split?
    ...
  15. Replies
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    BTW, had subcooling, by memory 5*f. Sight glass...

    BTW, had subcooling, by memory 5*f. Sight glass was clear, condenser is above the evap. I am going to fix a few leaks, yes I understand low charge may have had something to do here.
    Im going to...
  16. Replies
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    1,020

    404a walk in freezer evap

    What are typical causes for low teml split across the evap coil?
    Fiddled around today with a 0 to -10 freezer that was only splitting 3*f across the coil. 80*f superheat at the compressor.
    I...
  17. Replies
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    469

    the details, purefire peerless boiler...

    the details,
    purefire peerless boiler pf-140-n-rev2, high e condensing boiler
    natural gas, inlet gas pressure 9.2" wc, when running 6.85"wc
    checked, all gas lines sized appropriately, flue clear,...
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    469

    peerless purefire delayed ignition

    installed 21 peerless purefires in last two years. only have had problems with 2. this most recent call back / warranty is for aa delayed ignition. or if not delayed ignition, basically small...
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    586

    I'm goin fishen tomorrow. I have successuffly...

    I'm goin fishen tomorrow.
    I have successuffly ran this unit since sunday on return air. I have installed a room sensor and will move control to that tommorow, amongst other parameter changes.
    The...
  20. Replies
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    586

    mcquay mps set-up questions

    set a new mcquay mps062elas50 on a roof this weekend to replace an older model mcquay. The zone stat does not appear to be compatible with this new unit (p/n 665404b-09).
    The plan is to use this...
  21. sounds like a great idea. you just need to...

    sounds like a great idea.
    you just need to ask for a few numbers. obviously passing air across the coil and removing the moisture will remove btu's. cold air is going to come out the supply side...
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    593

    30*F suction line temp. ya, you're probably...

    30*F suction line temp. ya, you're probably bringing liquid back, or poor heat exchange at the evap.
    I guess the slugging problem was never resolved from the first burn-out. with a 16*f split, i...
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    777

    Thank you gentleman, york supplier never...

    Thank you gentleman, york supplier never mentioned superseded part. the camstat that's in ther is performing as should now that I corrected the rotation. I think with it facing the heat exchanger and...
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    old york fan limit question

    Fan limit switch for this older model york furnace is no longer available. Some one (who knows who or when) replaced it with a camstat p/n fal3c05td120a .
    It looks to have been installed wrong,...
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    Zones is very basic, simple is always nice. I...

    Zones is very basic, simple is always nice. I have seen a handful of these operate for years with out a hitch. I find most zoning problems are related to set point adjustments, bypass damper issues,...
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    honeywell temp set point controller

    I see these around once in a blue-moon. Could never find the iom for Honeywell T678B.
    anyone know at what temp of osa this sets the set point up?

    My understanding of this controller is:
    1...
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    388

    which did you choose? I think rubber pads sounds...

    which did you choose?
    I think rubber pads sounds cheap and easy, but springs sound good if you proportion them correctly. I just replaced broken springs on a Copeland semi herm.
    go to carrier's...
  28. Replies
    2
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    470

    mason industries makes great stuff. i like the...

    mason industries makes great stuff. i like the I-beam idea too, easy. I'm assuming this raising is for run-off of water? whatever you put down there, make sure the rain and sun won't rust/disolve it.
  29. Replies
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    5 plus years? commercial isn't really some...

    5 plus years? commercial isn't really some specialized industry, just a few changes from the residential market. Be prepared to be low guy on the totem pole. Most shops need a few cheap guys to run...
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    phosgene gas takes my breath away, not sure what...

    phosgene gas takes my breath away, not sure what the epa would have to say about this.
    Does refrigerant cook at brazing temp. we all know about burn-outs, but I bet those are flashes well over...
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    so, $25 an hour is about 50k a year? what's an...

    so, $25 an hour is about 50k a year? what's an automotive mechanic in west palm beach cost you an hour? I believe that's a good starting point to reference journeyman wage in your area.
    A valuable...
  32. Replies
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    don't you feel kinda cheap, when someone starts a...

    don't you feel kinda cheap, when someone starts a post, but never lets you know how it turned out. some of the best knowledge is gained from others experiences.
  33. burned out? like caught on fire? voltage drop...

    burned out? like caught on fire?
    voltage drop would be my first suspect. When the voltage goes down, the current goes up, and so does the heat. If it's a coil for a load, like the strip heat, maybe...
  34. Comp Contactor Fail - Circuit 2 Problem: The...

    Comp Contactor Fail -
    Circuit 2
    Problem: The Compressor
    Contactor for Circuit. #2 has
    malfunctioned.
    The circuit #2 compressor
    proving input is detected
    closed continuously for more
    than 3...
  35. Shoot me your email address, and the model you...

    Shoot me your email address, and the model you have, i'll mail you the iom. Can't disiffer your problem from your thread... ne more details?
  36. Replies
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    replay

    Had a similar problem on another brand. Found the ice sheets forming from ice not completley falling off the sheet, defrost was running too long, and poor cube formation.
    I cleaned the float assy,...
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    statitrac update

    After speaking with tech support, found out my rtm and ecem boards are 15 years old. Apparently the more updated boards allow for instant ex fan enabeling, as apposed to the lag of exhaust fan coming...
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    shotgun this problem

    Gentlemen, thank you for the replies.
    I have isolated this issue to exhaust not keeping up with economizer. Building doors swing open at .12inwc, the osa dampers are at a min 5% 100vfd, 12% 0vfd. I...
  39. Replies
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    intellipak building static issue

    Problem is occasional opening of building doors.
    two intellipaks and two duct furnaces for dual duct vav system. Bot intellis use statitrac, setpoint for bldg static on bot is. 03, .04 dead band....
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    1,107

    love me them books

    Folks,
    I would like some reconmondations on refer books. I have found over the years my training in other asspects of the hvac trade help me though refer service calls, but i need to get some...
  41. Replies
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    He hit the nail right on the head. Anything below...

    He hit the nail right on the head. Anything below 130 deg causes condensing, unless this is a high-e boiler, it won't like that at all. BTW, are your cool only stats pneumatic? If so, you may be able...
  42. Replies
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    1,204

    at such a low return temp, do you get a lot of...

    at such a low return temp, do you get a lot of condensation from the boiler?
  43. Replies
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    1,363

    Trane Voyager low loads

    My customer is interested in using two exsisting Trane YSC120A4RLA's to condition a large space of about 6,000 ft2, 8' ceilings at 64 to 68 degrees 24/7. Each unit is ducted for it's aprox 3,000ft2....
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    1,077

    constant volume equip, vav controlled

    New Trane Voyager - 15 ton downflow curbstyle. All duct supply and return preportioned and sized correctly. 2 stg heat and 2 stg cool. Replaced older Trane unit, due to swiss cheese heat xchnger....
  45. minimum ity heat postion, heating set point,...

    minimum ity heat postion, heating set point, priority local heat, zone sensor calibration. Have your service tech look into those four points.
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    There are companys that make heat tape, you could...

    There are companys that make heat tape, you could set that around/on the metal, and put it on a temp switch, to act as a defrost.
  47. Replies
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    upon power up. the varitracII (not sure which mod...

    upon power up. the varitracII (not sure which mod your running) executes the following sequence of operation:
    calibrates the bypass control loop, scans all ucm's, determines the system mode,...
  48. Replies
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    31,445

    Try pulling wires straight from disconect to...

    Try pulling wires straight from disconect to motor, then fire it up. if it runs fine, you'll see it in the amps.
  49. Replies
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    seized-up low temp comp

    New account, found walk-in (0* to -10) with defrost control acting-up (ie contacts not operating), compressor locked-up, and r416a as refrigerent.
    I will replace this compressor, but I want to...
  50. furnace/btu sizing for house in Truckee california

    Going to install the central heating for my cousins 1100 sqft house in Truckee (close to lake tahoe), but I'm from the South bay, and we don't deal with sub zero winters.
    He's budgeting this in,...
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