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  1. Replies
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    Somewhat. I am sometimes afraid of creating a...

    Somewhat. I am sometimes afraid of creating a short so I am trying to understand it.
  2. Replies
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    351

    Meaning of COMMON in a circuit

    I have a hard time grasping the term COMMON. I understand that common may have a few different meanings in different circumstances. Lets say you have a 208 volt crankcase heater on the L1 line side...
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    Dont need FDNY refrigeration license as far as I...

    Dont need FDNY refrigeration license as far as I know
  4. $80k without overtime

    $80k without overtime
  5. Replies
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    519

    Ok, there can't be any leaks because the system...

    Ok, there can't be any leaks because the system held nitrogen over the weekend.
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    Help with Micron gauge

    I bought a CPS VG200 Micron gauge and used it for the first time today. I am using a brand new set of yellow jacket gauges to pull a vacuum (hoses aren't vacuum rated). I can't get a reading unless...
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    Mitsubishi MHK1 wireless thermostat

    I was trying to connect a Mitsubishi MHK1 wireless thermostat to the receiver last night and the thermostat seemed to be unable to connect to a receiver. There's 3 units (2 of which were successfully...
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    Oh ok so I'm sure you know everything then.

    Oh ok so I'm sure you know everything then.
  9. Replies
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    1,238

    The pumps are slightly below the first floor in...

    The pumps are slightly below the first floor in the boiler room. Building is 2 stories. Pump is on a VFD but runs at 60 hz. Pressure is 30 lbs....system is all PVC.
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    The problem we're having is that there doesn't...

    The problem we're having is that there doesn't seem to be a pressure differential in some places and the water is not flowing from supply to return through the unit. Sometimes if there is a...
  11. Replies
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    They are not insulated so I can definitely say...

    They are not insulated so I can definitely say they are different sizes. One is probably 1" and the other is like 2". I would think the smaller would be supply so that it stays pressurized around...
  12. Replies
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    1,238

    Condenser water loop systems

    My company has a contract with a 200,000 square foot office building that has a condenser water loop that feeds 270 water source heat pumps on the perimeter. My question is this; there are two pipes...
  13. Emailed local 30 they said there probably won't...

    Emailed local 30 they said there probably won't be an apprenticeship recruitment this year. 2 year wait list
  14. Been looking for about a year

    Been looking for about a year
  15. I've also been trying to get my foot in the door...

    I've also been trying to get my foot in the door but have had no luck. Everyone seems to be looking to hire people who are already in the union.
  16. Replies
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    There's actually three pumps. Two 50 hp which...

    There's actually three pumps. Two 50 hp which were designed to run just the condenser water for the chillers but now run the whole loop. Only one runs at a time. There is a third pump that was...
  17. Replies
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    Yes, condenser water is pumped by this pump as...

    Yes, condenser water is pumped by this pump as well as the water for the heat pumps. There's 270 something heat pumps in the building.
  18. Replies
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    The pump runs at 50 hz 24/7. There is also 5 60...

    The pump runs at 50 hz 24/7. There is also 5 60 ton chillers run on the same water. Strainers are at the pump and are clean.
  19. Replies
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    I'm wondering if the check valve at the pump is...

    I'm wondering if the check valve at the pump is bad? There's no other valves besides manual loop isolation valves that are all open.
  20. Replies
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    No I haven't seen any valve like that. It's a...

    No I haven't seen any valve like that. It's a very simple system but I'm assuming that there has to be a pressure differential so that the return water doesn't reverse the flow?
  21. Replies
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    We've swapped hoses numerous times

    We've swapped hoses numerous times
  22. Replies
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    The pump is on a VFD but it runs at 50 hz all...

    The pump is on a VFD but it runs at 50 hz all day. I can assure you that the return is the return. There's 2 pipes one is larger in diameter (return).
  23. Replies
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    We have two pipes that lay on the floor under the...

    We have two pipes that lay on the floor under the unit that go throughout the perimeter of the building. What I've noticed is that there seems to be more pressure behind the return for some reason....
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    We've flushed the unit, flushed the lines ...

    We've flushed the unit, flushed the lines Strainers were cleaned last week.
  25. Replies
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    In cooling, the outlet should be hot. All it is...

    In cooling, the outlet should be hot. All it is is a loop that goes around the whole building with a supply and return. Supply has a 1/2 ball valve and so does the return. The problem is that when...
  26. Replies
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    Water source heat pump problems

    We have one troublesome water source heat pump in a building that had a condenser water loop. The one spot has an Islandaire water source heat pump that cuts out. The inlet water gets really hot....
  27. Replies
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    Are the techs in 638?

    Are the techs in 638?
  28. Replies
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    1,365

    So does anyone know about United? How it is to...

    So does anyone know about United? How it is to work for them?
  29. Replies
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    Yes I have. Emcor is pretty big.

    Yes I have. Emcor is pretty big.
  30. Replies
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    No http://www.unitedac.com/

    No
    http://www.unitedac.com/
  31. Replies
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    United Air Conditioning Long Island City?

    Does anyone know of them? Seems like a pretty big company.
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    638 shops hiring?

    Does anyone know of any 638 shops that are hiring?
  33. Yep that's it

    Yep that's it
  34. Ok, after googling, they are definitely circuit...

    Ok, after googling, they are definitely circuit setter valves.
  35. Water regulating valve on chilled water coil

    We have 4 air handlers each with their own chiller and closed chilled water loop that doesn't leave the room. On the coil (not sure whether it's the inlet or outlet can't remember) they have a...
  36. Removing calcium buildup from cooling tower intakes?

    We have this one evaporative tower that has bad calcium buildup on the intakes. Its hard, white and is like concrete. I tried power washing it but that didnt do much. Any ideas?
  37. Thread: Wages

    by nmt6789
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    Depends...I get $18.56/hr. Will be a second year...

    Depends...I get $18.56/hr. Will be a second year apprentice in May and will be bumped to $22.
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    Fieldpiece leads breaking easily

    I'm wondering if anyone else if having problems with their leads breaking easily. I have a SC77 and HS36 and the leads have broken on both.
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    I believe they are York.

    I believe they are York.
  40. Replies
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    639

    Linear "cdm" pneumatic diffusers?

    One of the buildings I work in has these linear diffusers that have these plastic bladders that inflate or deflate depending on the temperature. I'm not sure who makes them but they are controlled...
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    I am 24 years old, been around the business for a...

    I am 24 years old, been around the business for a few years but worked for some crappy residential companies until I got my foot in the door with my current company. My company was impressed with my...
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    Honeywell Thermostat key?

    Hello, does anyone know where I can buy a Honeywell thermostat key? There's many locking thermostats in the buildings I work in (mostly yo yo stats). I have a brown plastic key but I am looking for...
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    Trane PTAC toubleshooting

    We had an empty suite in one of the buildings I work in and we pulled out 3 Trane water source heat pump PTACs. These units look like they had external thermostats on them at some point. There are...
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    Turns out it was a bad freeze stat.

    Turns out it was a bad freeze stat.
  45. Replies
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    447

    Saftronics FP5 wont run in "remote"

    Hello there, I was doing a maintenance and had to shut down a air handler to change the belts but now the drive will only run in "local" and not in "remote".

    Does anyone know what I have to do...
  46. Replies
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    Testing a relay on a PTAC

    What is the proper procedure for testing a 5 pole relay?
  47. Question about 2 companies in Long Island area

    What do you guys know about Michael James Industries and Donnelly Mechanical? Good? Bad?
  48. Thread: 638A vs 638B

    by nmt6789
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    11
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    2,474

    Interview went really well.

    Interview went really well.
  49. Replies
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    Went really well. Answered all the technical...

    Went really well. Answered all the technical questions correctly and they were very impressed because I have no field experience.
  50. Thread: 638A vs 638B

    by nmt6789
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    11
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    2,474

    638A vs 638B

    I'm going for a interview today for a company that is in Local 638B. Is this the metal trades union or Construction trades union?
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