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  1. Replies
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    Cycled power...seems to be fine. Must have been...

    Cycled power...seems to be fine. Must have been something weird.
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    118

    Carrier 40GXM012 erratic control

    Wondering if anyone has encountered this problem. Put unit in cooling mode via remote control (snowflake shows on remote) and the heat symbol shows on the display of the air handler with a setpoint...
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    No not all have the same problem. 2 so...

    No not all have the same problem. 2 so far...seems to be a pattern
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    425

    Flow was a concern from the start. We had a...

    Flow was a concern from the start. We had a higher pressure on the return than on the supply from day one. Confirmed supply/return with building engineers. Tenant had to double the size of their...
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    Model # is E019HLU. Dont have serial number...

    Model # is E019HLU. Dont have serial number available right now. No modulating cooling or unloading.
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    If you call Mammoth they consider them WSHP but...

    If you call Mammoth they consider them WSHP but the customer special ordered them for cooling only.
  7. Replies
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    Problems with year old Mammoth WSHP

    I have a customer with 33 Mammoth horizontal units that seem to be developing the same problem. Original service call is diagnosed as a restriction (High head/low suction) - change the expansion...
  8. Donnelly doesn't lay people off.

    Donnelly doesn't lay people off.
  9. Pressurized overnight...no leak. I think someone...

    Pressurized overnight...no leak. I think someone let out the charge to be spiteful. 129 lbs 410A
  10. Mitsubishi City Multi evacuation and charging

    Had a service call yesterday for a City Multi system. Error code 1301 on the stat. Put my gauges on the system and its flat. (3) 10 ton condensing units tied together. (2) of which are "twinned" My...
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    The one I am talking about is this one ...

    The one I am talking about is this one

    http://www.cgnacontrols.com/members/product_documentation/ade36d4b5008ed81pg.pdf
  12. Replies
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    290

    Mars 32534 phase reversal protector

    Anyone familiar with these? Does the red light mean its in alarm or normal operation?
  13. Replies
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    529

    Knipex makes a bag with a laptop sleeve...

    Knipex makes a bag with a laptop sleeve...
  14. Thread: 638B to 638A

    by nmt6789
    Replies
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    14,763

    That statement holds no water. Look at how many...

    That statement holds no water. Look at how many people in total voted in the election. Much less than half.
  15. Yes you can be a "B" guy. Get the contractor list...

    Yes you can be a "B" guy. Get the contractor list and start sending resumes.
  16. Thread: 638B to 638A

    by nmt6789
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    14,763

    They're not always working though. Worst part is...

    They're not always working though. Worst part is "B" guys aren't represented and theres a lot of turmoil between "A" and "B". Also why dont we have an annuity?
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    From what i've seen you should have at least 10...

    From what i've seen you should have at least 10 years field experience to be a field supervisor. May have more opportunities in the HVAC field rather than ice making.
  18. Appion.

    Appion.
  19. Thread: New tool

    by nmt6789
    Replies
    23
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    2,114

    What do you guys use the vt04 for? Just curious...

    What do you guys use the vt04 for? Just curious if it has any use in the commercial end of this business.
  20. Liebert, Stulz, have seen mini splits hold server...

    Liebert, Stulz, have seen mini splits hold server rooms just fine
  21. Replies
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    Liebert keychain

    Does anyone know where I can get a Liebert 7/32" panel key (used to unlock panels from unit) They used to make a keychain style one but I haven't been able to find one.
  22. Thread: 638B to 638A

    by nmt6789
    Replies
    53
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    14,763

    Over the years, the work of the department has...

    Over the years, the work of the department has grown and now includes workers in the direct employ of federal, state and local governments or employees of private contractors who provide labor for...
  23. Replies
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    1,168

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

    Somewhat. I am sometimes afraid of creating a short so I am trying to understand it.
  24. Replies
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    1,168

    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
  26. $80k without overtime

    $80k without overtime
  27. Replies
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    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.
  28. Replies
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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.
  31. Replies
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    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.
  32. Replies
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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...
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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...
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    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...
  35. 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
  36. Been looking for about a year

    Been looking for about a year
  37. 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.
  38. 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...
  39. 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.
  40. 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.
  41. 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.
  42. 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?
  43. Replies
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    We've swapped hoses numerous times

    We've swapped hoses numerous times
  44. Replies
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    3,114

    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).
  45. 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....
  46. Replies
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    3,114

    We've flushed the unit, flushed the lines ...

    We've flushed the unit, flushed the lines Strainers were cleaned last week.
  47. Replies
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    3,114

    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...
  48. 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....
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    Are the techs in 638?

    Are the techs in 638?
  50. Replies
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    1,939

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

    So does anyone know about United? How it is to work for them?
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