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  1. Replies
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    I just looked at the Grainger catalog and it...

    I just looked at the Grainger catalog and it looks like what you want is a multi-function relay that can be configured as "interval delay". Don't have an actual parts number for you, that usually...
  2. Thread: Nu-22 vs R22

    by fxb80
    Replies
    4
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    238

    We changed a facility from R-22 to NU-22. ...

    We changed a facility from R-22 to NU-22.

    NU-22 has less capacity, the equipment will run longer. If equipment has less than normal airflow, the TXVs will need substantial adjustment, we ran out...
  3. I second this statement. 10 PSI supply to...

    I second this statement.

    10 PSI supply to return is pretty usual. Don't be surprised if you check a bunch of stuff only to find that everything is ok and you end up adding the pumps. Not saying...
  4. Replies
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    728

    2200 psi

    2200 psi
  5. Replies
    486
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    8,611

    A link to the grand jury documentation, if anyone...

    A link to the grand jury documentation, if anyone is interested.

    http://www.npr.org/blogs/thetwo-way/2014/11/25/366507379/ferguson-docs-how-the-grand-jury-reached-a-decision
  6. Replies
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    2,029

    And, since freon molecules are larger than...

    And, since freon molecules are larger than nitrogen and oxygen we wouldn't have to top off the pressure as often, maybe never! Which refrigerant has the largest molecule? Could someone please do a...
  7. Replies
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    2,029

    Good article. Since moisture is bad for tires, if...

    Good article. Since moisture is bad for tires, if I have new tires mounted that will be nitrogen filled, I should ask for proof that the bead lubricant used is not water based or mixed with water, to...
  8. Replies
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    2,029

    From: ...

    From:

    http://www.getnitrogen.org/pdf/graham.pdf

    "I hope this helps clarify why O2 permeates faster through rubber than does N2 and a major aspect of why it is a good
    idea to significantly...
  9. Replies
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    1,231

    "The data is pretty solid," Casey says. "If you...

    "The data is pretty solid," Casey says. "If you look at the 100-year global temperature chart, you look at the steep drop-off we've had since 2007. It's the steepest drop in global temperatures in...
  10. Replies
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    1,724

    Glow coil resistor?

    Glow coil resistor?
  11. Thanks, that helps, bulb on the permanent suction...

    Thanks, that helps, bulb on the permanent suction line, I see it now.
  12. Heat Pump with only one refrigerant control (TXV)?

    There's an ad for an Emerson NXT series valve that states: "Bi-flow capability, allowing one valve to control the superheat in both cooling and heating modes for close-coupled or packaged heat pump...
  13. Select "Staged" on the pulldown for Seq1,2,or3 of...

    Select "Staged" on the pulldown for Seq1,2,or3 of the control loop output. That should permit the RIO output to show up if it is configured and not used somewhere else.
  14. Replies
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    2,276

    Should a woman who has an abortion be charged...

    Should a woman who has an abortion be charged with capital murder or some lesser charge?
  15. Replies
    56
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    2,276

    I don't think things have changed with religion,...

    I don't think things have changed with religion, specifically Christians. Since emperor Constantine, third century AD, Christians have forced their beliefs on others by incorporating church law and...
  16. Replies
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    480

    We've been happy with this supplier. ...

    We've been happy with this supplier.

    http://www.wireguards.com/items/wirecage_thermostatguards.cfm?catID=90
  17. Replies
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    514

    A BTU is the energy required to raise the...

    A BTU is the energy required to raise the temperature of one pound of water by one degree Fahrenheit at atmospheric pressure. Pounds of water, pounds of air, a pound is a pound. 2815 BTUH divided by...
  18. Replies
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    514

    Not my area of expertise, but... The room...

    Not my area of expertise, but...

    The room contains 60 lbs. of air. If the air were the only thing absorbing the heat, and assuming the device is rated 2815 BTU per hour, after one hour the room...
  19. Replies
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    576

    I'm assuming this AHU recirculates and is not...

    I'm assuming this AHU recirculates and is not 100%OA. If it were 100% OA then you would definitely control by OAT. A recirculation unit would be controlled by RAT if you can't do a space temp sensor....
  20. Replies
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    4,867

    Some good reading I found. ...

    Some good reading I found.

    http://carbon.atomistry.com/decomposition_carbon_dioxide.html
  21. Firestat goes in the return air prior to the...

    Firestat goes in the return air prior to the introduction of outside air.
  22. Replies
    5
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    688

    Microsoft Office Visio

    Microsoft Office Visio
  23. We've used NU-22B in a plant where the customer...

    We've used NU-22B in a plant where the customer specified it. On many of the smaller rooftop units there were no issues, but three bigger systems gave much trouble. And we had differing opinions from...
  24. What I have done is mark through the parts I'm...

    What I have done is mark through the parts I'm not willing to abide by, or make changes, initial everywhere there's a change, and get my boss to initial it.
  25. Replies
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    2,641

    I found out today that the MUAs are DX; AAON...

    I found out today that the MUAs are DX; AAON rooftop units with variable capacity Copeland scrolls and refrigerant reheat, so there is no issue of separate chilled water.

    What about dewpoint...
  26. Replies
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    2,641

    I just did my first quick reading of the sequence...

    I just did my first quick reading of the sequence of operation. I'm on another project, but can't help looking at this chilled beam some just to get away from the other. You know, taking a break from...
  27. Replies
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    2,641

    I also would interested to hear what experiences...

    I also would interested to hear what experiences others have had, since we will be installing an active chilled beam job over the winter. A project manager and technician are working on the details...
  28. Replies
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    712

    Thanks for the reference.

    Thanks for the reference.
  29. Replies
    4
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    712

    Lon termination module or a resistor?

    Trane calls for a 120 Ohm resistor at the ends of Lon and Honeywell has termination modules. Is a resistor enough?

    What are you guys using?
  30. Thread: temporary heat

    by fxb80
    Replies
    20
    Views
    1,510

    It is possible to run equipment during...

    It is possible to run equipment during construction, with the only downside being added runtime.

    I know because we work for an owners' group that specifies equipment shall be used during...
  31. Thread: Resistors

    by fxb80
    Replies
    10
    Views
    860

    Honeywell part no. 4074EJM for economizer testing.

    Honeywell part no. 4074EJM for economizer testing.
  32. There's a Jace 700, but it isn't doing any smoke...

    There's a Jace 700, but it isn't doing any smoke control. We're using Spyders at the AHUs, but if they settle on having fan shutdown, which sounds likely from what the Fire Marshall is saying, that's...
  33. The PM got my written report this morning. I...

    The PM got my written report this morning. I spoke with him afterwards and he agreed the original configuration is suspect. He is consulting our engineer before speaking with the Fire Marshall. He...
  34. Replies
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    1,389

    The old fashioned, but effective, solution is...

    The old fashioned, but effective, solution is partitioning the fan sections.

    That is, of course, after you have ruled out obvious stuff like dirty condenser coils and bad capacitor.

    The...
  35. I'm in NW Arkansas. Worked many years in Central...

    I'm in NW Arkansas. Worked many years in Central Arkansas, and when I moved here it felt like I had gone back 10 years in time regarding code compliance and energy efficiency requirements, but part...
  36. Code enforcement is somewhat hit or miss here. If...

    Code enforcement is somewhat hit or miss here. If you get a reputation for doing work that looks good the inspectors give it a nod, they're pretty busy with getting the really crappy work redone.
    ...
  37. Smoke detection: Convert from area purge to fan shutdown on multi-story building?

    We're in the process of converting an eight story building from pneumatic to DDC. The building dates from early 70's. I have the original JCI control drawing for the AHUs; one AHU per floor, constant...
  38. Replies
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    1,398

    The last time I signed one we negotiated, I...

    The last time I signed one we negotiated, I didn't agree not to compete but did agree not to solicit their customers. The contract was changed on the spot, we both initialled the changes, and I got a...
  39. Energize a relay when the controller turns On, NC...

    Energize a relay when the controller turns On, NC contacts turn off fans.
  40. Replies
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    727

    Thanks for the clarification.

    Thanks for the clarification.
  41. Replies
    9
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    727

    Since the SpyderTool is a .jar file and it's a...

    Since the SpyderTool is a .jar file and it's a download on Buildings Forum, would it be correct to say that all one would need is Buildings Forum access to install the tool on an non-WEBs Jace?...
  42. Replies
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    727

    What value is a Honeywell Spyder with ILC?

    Does anybody here have a personal experience or know of an occasion where having an Independently Licensed Spyder was needed or desirable? We always use open license JACE but does open license have...
  43. Been away for a few days doing the "it's not a...

    Been away for a few days doing the "it's not a career, it's a lifestyle" thing converting a church from Trane to Honeywell.

    ascj,

    I have done custom programming to this point but am trying to...
  44. Thanks for the response and the document. Now I...

    Thanks for the response and the document. Now I know that the term for what I'm concerned about is "dithering". I'll be using deadband from now on.
  45. Actuator wear from not having PID deadband? HW Spyder.

    Regarding valve and damper actuators PIDs, I have been leaving the PID deadband at 0. I wonder what sort of affect that has on the actuator over time, since even a well-tuned loop will have regular...
  46. http://tekmarcontrols.com/products/alternative-ene...

    http://tekmarcontrols.com/products/alternative-energy/155.html
  47. R-22 to R-410a conversion; distributor nozzle sizing?

    When converting an evaporator from R-22 to R-410a and there's a distributor nozzle, do you replace the nozzle when the TXV is replaced? If so, what would be the effect of not replacing the nozzle?
    ...
  48. Replies
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    797

    R-410a fractionization experiences?

    I know that fractionization is not supposed to be an issue with R-410a and that it is supposed to be charged as a liquid. My questions: Does anybody have any experiences where fractionization was...
  49. Replies
    0
    Views
    378

    Ice proof hydronic valves for a brewery.

    I redid some valves in a brewery on the fermentation and storage tanks a few years ago. It was my first and only experience with a glycol system operating below freezing (25F). I used 3-way ball...
  50. Replies
    9
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    1,453

    I take the H.E. outside the house and flush it...

    I take the H.E. outside the house and flush it with water.
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