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  1. Afternoon, guys....Having the same issue with my...

    Afternoon, guys....Having the same issue with my new laptop, can someone forward me that patch again for the i-Vu software? (Tried to send MechMike2 a PM, but his PMs are turned off or something)
    ...
  2. Should be manifold, but the supply pressure spec...

    Should be manifold, but the supply pressure spec will also be elevated. The only other device on this gas line is a generator which required HTN pressure, so they are looking for a HTN rated tankless...
  3. HTN Natural Gas pressure boiler/water heater

    Looking to find a tankless water heater (Commercial or residential) and boiler (around 300-400k btu) that run on Natural gas pressures in the 8-14" w.c. range.

    Most I find are 3.5-8" w.c.

    ...
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    WSHP tower in the North East winter

    Just inherited a building with about a 200 ton WSHP tower - About 65 heat pumps in the building.

    There are boilers to 'reheat' the condenser water, but not sure if we need to winterize the tower...
  5. Thanks again Mike...Everything worked perfect...

    Thanks again Mike...Everything worked perfect after I updated the Field Assistant.


    My next question -

    I have three rooftop units feeding ~6 VAVs each. I can tie them all together to...
  6. Cool....Thx! I will give it a shot!

    Cool....Thx! I will give it a shot!
  7. Can't connect to Carrier BacNet decives with i-Vu

    Doing a startup on some VAVs this week, and having trouble with the i-Vu software that came with the VAVs.

    I installed everything, and am connecting through the USB dongle.

    When I try and...
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    Thanks, Kontrol!! I think you're...

    Thanks, Kontrol!!




    I think you're reffering to the Carrier 3v 'VVT', not the BacNet I-vu VAV.

    I hated that 3V with the 'linkage coordinator' nonsense. Trane's VariTrac system is sooo...
  9. Replies
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    Should be doing startup soon....Where can I get...

    Should be doing startup soon....Where can I get the 'SpongeBobs'??

    Also - McGreevy - Are you saying the daisy-chain has to go in the order of the VAV #'s?

    The longest string only has 8...
  10. Replies
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    I see....I will advise and see if they'll do a...

    I see....I will advise and see if they'll do a change order. Thanks! Certainly easier to run it now with everything open...
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    Ascj - I believe their thought was to have each...

    Ascj - I believe their thought was to have each trunk of VAVs communicate directly to the rooftop that is supplying air to them.

    They are not 'that' close to each other either, and there is no...
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    Thanks for all the help, Wolf, Dallas, and...

    Thanks for all the help, Wolf, Dallas, and Tleyden.

    Yeah, it's coming along, waiting on sparky to get us some power so we can program them.

    It won't really be on an open network yet. But we...
  13. Replies
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    Carrier I-Vu BacNet VAV

    We are doing a project with the newer Carreir VAV system 'I-Vu' with BacNet.

    On the VAVs there are two dials (as pictured), just wondering if these are for setting up the address.

    ...
  14. Replies
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    2,402

    Ok. Got it...That should be easy enough....Big...

    Ok. Got it...That should be easy enough....Big thanks!

    After looking at electrical diagrams online for the past hour I look like this --> :gah:
  15. Replies
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    2,402

    Can I average two thermistors together?

    I have a customer that is currently using a return air sensor (thermistor) to control a rooftop unit.

    They want to add a thermistor to one room, but also use the return air sensor and 'average'...
  16. Replies
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    1,517

    Suction pressures. I would imagine that we would...

    Suction pressures. I would imagine that we would see an increase in suction pressures/temperature if the valves were shot. How else would it melt that 176 deg F plug on the suction line?
  17. Replies
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    But we'd see some indication of that by the...

    But we'd see some indication of that by the pressures, no?
  18. Thread: Mcquay RPS

    by turbo50mike
    Replies
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    656

    Most of the current RPS' pump themselves down at...

    Most of the current RPS' pump themselves down at the end of the cooling cycle.

    You're on the right track. Let the unit pump down, and then close the service valve near the filter. You'll still...
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    The unit is not old at all (maybe 5 years)...And...

    The unit is not old at all (maybe 5 years)...And these reliefs were not on the compressor, but about 2 feet away on the suction piping. Carrier says the suction one melts at 176 deg F, liquid at 210...
  20. Replies
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    Suction meltaway relief valve open

    Got a service call on a Carrier condenser that wasn't working. Found the suction meltaway relief valve open, and the entire charge gone.

    Condenser fans seem to be working, and everything else...
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    Two things...Does it have an Economizer? If...

    Two things...Does it have an Economizer?

    If so, turn off power, unplug Econo at the board, restore power; See if that changes anything.

    If that doesn't help; just hang the sensor with a new...
  22. Thread: Boom.

    by turbo50mike
    Replies
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    598

    Boom.

    This probably made some noise...


    Air cooled 06e, R22.
  23. Replies
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    It's a single compressor condensing unit for a...

    It's a single compressor condensing unit for a single air handler.

    My tech found a few other surprises...He was changing the suction filter, and found out someone had already taken it out, and...
  24. Replies
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    947

    One unloader or two?

    Looking at a 25 ton replacement compressor - New compressor comes with a spot for one unloader. Existing compressor (which is a replacement, also) has two unloaders (pictured).

    Carrier tech says...
  25. Replies
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    I think I worked on a Carrier 25 ton earlier this...

    I think I worked on a Carrier 25 ton earlier this week...Does it look like this or have similar unloaders?
  26. Replies
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    So it should look like this- Insulation...

    So it should look like this-

    Insulation
    \\\\\\\\\\\
    Vapor Barrier (8 mil plastic)
    \\\\\\\\\\\\
    Ceiling Tile
    \\\\\\\\\\\\
    Conditioned Space
  27. Replies
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    Pulls the air from the plenum, and then through...

    Pulls the air from the plenum, and then through some ductwork back into the plenum (~near the central return for the building system).
  28. Replies
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    Yes. Well, it's open, but the return for this...

    Yes. Well, it's open, but the return for this unit is in the room.
  29. Replies
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    2,417

    Yes, it's the self contained MiniMate 1.5 ton....

    Yes, it's the self contained MiniMate 1.5 ton. The humidifier is rated at 2.5 lb/hr.

    I would say the surrounding spaces are 72-73 deg F.

    The walls are insulated, but likely no vapor barrier...
  30. Replies
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    Water quality should be good, (we even did the...

    Water quality should be good, (we even did the 'add a pinch of salt' to the canister) - Liebert says their electrodes should work even with the lower conductivity water. They used to offer a...
  31. Replies
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    Liebert Mini Mate and Humidity Issues

    We are working on a small space (~450 sq ft) that has a new Liebert 1.5 ton minimate with a factory steam humidifier installed. (No outside air at all)

    The area needs to be at about ~40%...
  32. That sounds like you're on the right track. I...

    That sounds like you're on the right track. I believe this building used to have two different pressures depending on if it were heating or cooling. Found two separate regulators tied into the old...
  33. Pneumatic guys - Diverting and Reversing Relay ??s

    Took over a building with some pneumatic VAVs, and found a bunch of these 'Diverting Relays' and some 'Reversing Relays' as well.

    Not sure exactly what these do, or how they work...Did a web...
  34. Replies
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    Is this a re-heat VAV? What is the temp/pressure...

    Is this a re-heat VAV? What is the temp/pressure of the air in front of the VAV? What is the discharge air temp at the unit/AHU?

    I've had pretty good luck with the VV550's. If it is having a...
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    That's a big help...Thanks! MJB

    That's a big help...Thanks!

    MJB
  36. Replies
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    We'll have to consult with the architect. They...

    We'll have to consult with the architect. They didn't list any special equipment for the surgery area.

    The whole office is about 7000 sq ft, and the surgery area is about 600. Not wanting to...
  37. You are thinking way too hard about...

    You are thinking way too hard about this...Barometric relief is just a 'doggy door' for air (and it literally looks like a doggy door on Trane units and some others).

    If you saw one you'd figure...
  38. Replies
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    HEPA unit for Lasik Eye Surgery area?

    One of the buildings we service has a new tenant which does some Lasik eye surgery.

    Just trying to figure out if this area would require a HEPA filtered unit, or something special. Or should we...
  39. Replies
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    Yeah...They crap out all the time. Replace the...

    Yeah...They crap out all the time. Replace the assembly. And when you do this, be sure to clean that mesh screen that is held in place by two of the bolts...If it has been running for a while like...
  40. People look at me funny before I even say a word!

    People look at me funny before I even say a word!
  41. D'oh! Whatever it's called!

    D'oh! Whatever it's called!
  42. lol...That's exactly what I was going to do if no...

    lol...That's exactly what I was going to do if no one responded.


    Thanks, dad...We'll try the delrin ones and see how they do.
  43. Brass ferrules or delrin with polyethylene tubing?

    We are doing some air line upgrades (70-80psi), and want to use the polyethylene tubing with compression fittings. However, they offer delrin compression fitting, or brass.

    The delrin seem...
  44. Replies
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    One end should have an expansion bearing if the...

    One end should have an expansion bearing if the shaft is going to be subject to large temperature swings (i.e. Greater than 25-30 degrees).

    A supply fan shaft that is after the heating/cooling...
  45. Not all of them, but when we have replaced...

    Not all of them, but when we have replaced compressors the charge we took out was within ounces of what is indicated on the tag.
  46. There is no doubt that these two will end up in...

    There is no doubt that these two will end up in court over this and other issues...
  47. Hammered as in head pressures out of control for...

    Hammered as in head pressures out of control for so long, that 6 of the 8 compressors have been replaced. The fins are fine - I'll have to ask the tech that did most of the calls more of the...
  48. I dunno, I think it was circuit 1 tripping before...

    I dunno, I think it was circuit 1 tripping before 2....These units are out in the open...We've ducted the fans on units that were packed tightly together in between buildings in NYC, but these aren't...
  49. Yeah, we had professional powerwashers backwash...

    Yeah, we had professional powerwashers backwash the coils either two or three times. The coils are not bent over...Both them and us knew what we were doing, so no bent fins...



    And...
  50. They are 22's. They're not old...But they are...

    They are 22's. They're not old...But they are HAMMERED.

    The ambient vs head used to be crazy, but after multiple cleanings it got better. On mild days (less than 80 deg), no problems, and head...
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