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  1. How do you start it now? Use the ICM as a pilot...

    How do you start it now? Use the ICM as a pilot relay for the secondary relay to start the motor. Use another relay to break the power to the distributor to stop it. Pretty simple.
  2. Just use an ICM450 phase monitor. Use the NO...

    Just use an ICM450 phase monitor. Use the NO contacts to break the electric motor starter. Wire the gas motor through the NC contacts.

    When you have electricity, the phase monitor closes the...
  3. kinda hard to help you with such a vague...

    kinda hard to help you with such a vague question, and so little information.

    do you have any equipment information? manufacturer, model, etc?

    what does the "gas motor" do? inducer fan motor?...
  4. Thread: delta T

    by 71CHOPS
    Replies
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    274

    if an evaporator is designed to collect 12,000...

    if an evaporator is designed to collect 12,000 btu's, the condenser is generally sized to reject 15,000 btu's.


    the additional heat (3,000 btu's) comes from heat added to the refrigerant by...
  5. good luck. a lot of those systems seem to be...

    good luck. a lot of those systems seem to be spec built for each site. I've had several different weirdo brands like that. every one seems to have an extreme lack of support across the board, as...
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    Your question was specific to anyone with...

    Your question was specific to anyone with experience with their chillers, but I will add....if the quality of their RTU’s is transferred into the chiller line up, a york will look like a stamped...
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    Ok. So the only issue is that the new pump (on...

    Ok. So the only issue is that the new pump (on the right) draws locked rotor amps when
    Started?

    You said nothing changed except
    You rotated the pump, and added piping. That could be quite a...
  8. Replies
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    902

    I can’t tell anything from the pic. What are the...

    I can’t tell anything from the pic. What are the vertical items? One a pump, one a heat exchanger? What are the brass parts? Valves, check valves? What is the direction of flow? What is...
  9. Replies
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    Aaon makes decent equipment. I've worked on a...

    Aaon makes decent equipment. I've worked on a fair amount of their RTU's. I like how they lay out the compartments, cabinet quality is good and sturdy, nice doors, latches, etc. component layout...
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    I usually go by discharge temps if I have a leak....

    I usually go by discharge temps if I have a leak. running everything 100% for about 15 minutes, I look for 170-190*.......but that's still just guessing.
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    ok, so you said 407C ....lets ASSume it's...

    ok, so you said 407C ....lets ASSume it's designed for a 90* condensing temp, and 15* evap temp. (just for argument). that puts you at around 170 psi head and around 45 psi suction.

    so you had a...
  12. Replies
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    If this is the first startup of the year, and...

    If this is the first startup of the year, and you’re just starting to make ice, then yes, you have too high of a load.

    The problem with using approach is that you don’t know what the system...
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    690

    what refrigerant? WhAt is the design condensing...

    what refrigerant? WhAt is the design condensing temp.? What is the design evap. Temp. ?

    4 compressors with 2 condensers? You likely only have one condenser, but have other heat exchangers for...
  14. Replies
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    1,105

    Well, If you have a 3 watt heater, with the mass...

    Well, If you have a 3 watt heater, with the mass of a compressor, and 5* ambient.....what’s going to win?
  15. Replies
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    I could see less effective below 50*. The...

    I could see less effective below 50*. The actual small amount of heat they generate (especially back then) prolly couldn’t combat extreme cold.

    Kinda like cooling tower heaters. When it’s 5*...
  16. Strictly small oxy/acet. Torch sets: 7 and 7. ...

    Strictly small oxy/acet. Torch sets:

    7 and 7. The only reason to crank up your regulators past 7 psi is for using the oxy cutting tip.

    You can braze 3” copper with a small oxy/acet. Rig, but...
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    579

    I thought I wanted to do industrial compressor...

    I thought I wanted to do industrial compressor work (huge recips, screws, etc.) until I got a taste of it. Like valdeloc said, it's over rated. Don't get me wrong it's very interesting, but it...
  18. Replies
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    with reciprocating compressors they are...

    with reciprocating compressors they are crucial....scrolls can tolerate liquid, but you still don't want a mix of refrigerant and oil in the crank case.

    just to add to what was said......when you...
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    that module should be the Honeywell W7340 Premium...

    that module should be the Honeywell W7340 Premium western. it should have Modbus.....can you not connect to that?

    refer to honeywell doc# 63-2569. all the diagrams show the 2-10VDC as the...
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    it looks like PTFE not only can begin to distort...

    it looks like PTFE not only can begin to distort at 256*F, it also grows in size 5-8%.....this is also pressure dependent.


    so I would say yours at least got close to that 256* mark, as it also...
  21. Replies
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    Interesting....

    Interesting....
  22. Replies
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    792

    The valve is controlling hot gas? Or the chiller...

    The valve is controlling hot gas? Or the chiller leaving water set point is 40*, and the EXV is the primary liquid metering device to the cooler?
  23. Replies
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    792

    make sure the end is set right. not sure on...

    make sure the end is set right. not sure on those larger tonnage valves, but on the smaller ones, that wonky lookin base is a smooth domed point that screws onto the stem that opens and closes it. ...
  24. When I was in school, we filled a short coupled...

    When I was in school, we filled a short coupled system with something like 30 lbs of refrigerant. It was most definitely a liquid pump! Something other than a Scroll prolly would have detonated.
  25. Replies
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    Visit the junkyard section of the site to sell...

    Visit the junkyard section of the site to sell parts and equipment.
  26. Thread: Lennox A55

    by 71CHOPS
    Replies
    20
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    812

    is that software still available for download? ...

    is that software still available for download? I searched their site, but couldn't find it.
  27. Replies
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    one more thing to consider on intermittent trips...

    one more thing to consider on intermittent trips is to also watch it running with all the panels in place. could be something that only happens with it all closed up.
  28. so they installed a downflow unit in a horizontal...

    so they installed a downflow unit in a horizontal application, big deal, we see it all the time around here!!
  29. I did some work for a friend, they just bought a...

    I did some work for a friend, they just bought a church. I was in the ceiling looking for a utility room light feed when I saw 2 pieces of romex cut off, laying on some tiles...both of them were...
  30. Replies
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    393

    Yeah, there are different controls depending on...

    Yeah, there are different controls depending on the unit age.
  31. Replies
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    Just order a RTRM board for a constant volume...

    Just order a RTRM board for a constant volume unit, and get the stat interface board (if the new board doesn’t have the terminals).

    Why reinvent the wheel when you can get the OEM parts to make...
  32. Replies
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    If the BAS still works, just lock the speed drive...

    If the BAS still works, just lock the speed drive at whatever Hz you need to get the job done. If you need to have high (cool) and low (heat), use the digital inputs on the drive for set speed...
  33. Replies
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    Sounds like a lack of primary flow. Has the...

    Sounds like a lack of primary flow. Has the system Flow rate been determined?
  34. Replies
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    I’ve NEVER done that!🙄....I swear!

    I’ve NEVER done that!🙄....I swear!
  35. Replies
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    🤣🤣🤣 😬. Wait, I meant I have no idea who that...

    🤣🤣🤣

    😬. Wait, I meant I have no idea who that guy is!!
  36. Replies
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    They had software and EXV controller issues with...

    They had software and EXV controller issues with a large run of units....hundreds. Your serial number should have been included in the service repair bulletin, and corrected under warranty.
  37. Replies
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    KISS. If you have cold..... hot water pipes,...

    KISS.

    If you have cold..... hot water pipes, you either don’t have flow, due to a restriction, valve, or air lock. Or you don’t have any water in the hot water loop.


    Wayne is correct....
  38. Replies
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    Did you check the limits in the heat exchanger...

    Did you check the limits in the heat exchanger compartment?
  39. Replies
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    I would prolly never do it on a refrigeration...

    I would prolly never do it on a refrigeration system. Unless I had a filter downstream.

    On a hot water loop, it shouldn’t matter.

    A cutoff wheel seems to produce more debris than a saw. ...
  40. Thread: VAV Rookie

    by 71CHOPS
    Replies
    5
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    512

    If you have something called “insight” for a...

    If you have something called “insight” for a front end, you have a mish/mash of controls. Never a good situation.

    Trane VAV’s are pretty stable over the long term (20+ years). You might try...
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    Am I missing the simple fact that part winding...

    Am I missing the simple fact that part winding start is supposed to reduce starting amps.

    Starting amps are reduced by causing the motor to begin rotation before full voltage is applied.

    It...
  42. Replies
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    if you have an issue that is common to all units,...

    if you have an issue that is common to all units, the problem likely isn't with the units.
  43. I would say if you aren't having any issues,...

    I would say if you aren't having any issues, don't fix what isn't broken.

    the upgrade is pricey.....if you're just dumping end of year cash, go for it!
  44. Replies
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    Ok, thanks for the info. Everyone starts from...

    Ok, thanks for the info. Everyone starts from somewhere.

    That is a basic service valve. Back seat (counterclockwise) opens the compressor to the line, and closes the access port. Crack the...
  45. Replies
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    I would try removing the delay first (as chev...

    I would try removing the delay first (as chev said). Take out the time delay and run the second contactor coil through an auxiliary relay in the first contactor.

    Sounds like the entire system is...
  46. Thread: She blew up

    by 71CHOPS
    Replies
    7
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    857

    Put a nitrogen purge on your pump, and you won’t...

    Put a nitrogen purge on your pump, and you won’t have to change oil.
  47. I have a feeling the failures you experienced,...

    I have a feeling the failures you experienced, were also due to the high ambient conditions in your area.

    Wether they have a VFD, or are Wye/delta start, they are still gonna be spinning the same...
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    Good deal!

    Good deal!
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    not only the above, but the beds on 3D printers...

    not only the above, but the beds on 3D printers are generally pretty small.....unless you spend some SERIOUS cash.

    if you really want make some parts, get the titanium 3D printer.
  50. what type of compressors do you want.....scrolls...

    what type of compressors do you want.....scrolls or screws?
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