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  1. Looks to me like they expect the discharge air...

    Looks to me like they expect the discharge air temp. To match the thermostat reading.
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    342

    yeah, the coremax fittings are used for charging...

    yeah, the coremax fittings are used for charging by the factory, as CC said, there should be another suction port.
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    502

    interesting, I wonder if the motor/sensor is...

    interesting, I wonder if the motor/sensor is correct for the unit? could be the wrong one for that exact model.

    Also, might wanna check the parts lists, it's possible that there should be an...
  4. can you even buy separate parts (motor/module)...

    can you even buy separate parts (motor/module) for those?

    I always figured it would be all or nothing.
  5. Thread: York Rtu

    by 71CHOPS
    Replies
    16
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    689

    Sign up for PRO membership.

    Sign up for PRO membership.
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    984

    Good deal, being open and honest about your work...

    Good deal, being open and honest about your work is the best way to work!

    I don't pay much attention to subcooling on an industrial refrigeration system....especially with receivers.

    I...
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    602

    LOL! No biggie man, I've been there too.

    LOL! No biggie man, I've been there too.
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    984

    I've seen vapor lock on refrigeration skids with...

    I've seen vapor lock on refrigeration skids with liquid refrigerant pumps, but that was due to the lack of pressure differential in the vessels...well, some other issues also...

    Anyway, with 40%...
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    602

    you'll likely just have to play with it. you...

    you'll likely just have to play with it.

    you should be able to get into the PID loop adjustments...they may or may not be using the Derivative....prolly not.

    you can also change the number of...
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    I don't do rack work, but If that were me, I...

    I don't do rack work, but If that were me, I would suspect the system is low on charge.

    do supermarket racks use liquid refrigerant pumps to circulate to the cases?
  11. yeah, it's actually quite impressive what an ABB...

    yeah, it's actually quite impressive what an ABB (and others) can do as a stand alone "controller".....we never really even scratch the surface of what can be accomplished with one.
  12. So do you guys condemn heat exchangers strictly...

    So do you guys condemn heat exchangers strictly on combustion analysis, or do you use that as the first step, then do a visual to confirm?
  13. that controller is an Eaton product, rebranded...

    that controller is an Eaton product, rebranded for BAC.

    search for "Eaton ELC-GPXX".....that is an 02, there are several controllers in the GP series.


    It looks like it's pretty flexible, with...
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    850

    that's pretty nice.

    that's pretty nice.
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    850

    I've got an Extech Oyster, and a Kele signal...

    I've got an Extech Oyster, and a Kele signal generator. they both do 4-20, 0-10, 2-10.....the Oyster will act as meter also to check loops, the kele is just a generator.


    Each Econ module is...
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    It depends on the software version how the vanes...

    It depends on the software version how the vanes and drive react. it also is dependent on several operating parameters, including lift, tower water temp., chilled water temp., etc. etc.

    it is...
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    so when you cycle through using the test...

    so when you cycle through using the test terminals, circuit 2 cooling energizes before circuit 1??

    should be blower, cool 1, cool, 2, heat 1, heat 2, economizer (for a basic unit).......that's not...
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    Trane used to do this in their large packaged...

    Trane used to do this in their large packaged condenser units. There was a section of piping with a check valve and solenoid, which isolated that section. All those units had a relief valve piped...
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    There is a whole world of knowledge associated...

    There is a whole world of knowledge associated with grease and bearing lubrication. Its a rabbit hole that is never ending.

    In its most simple form, grease is oil suspended in a delivery...
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    The only time I've dealt with components...

    The only time I've dealt with components exploding was a Mitsubishi multi city. One of the check valves exploded. They said it was due to internal wear from low load operation.

    I would also...
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    unless the bladder in the tank is ruptured..... ...

    unless the bladder in the tank is ruptured.....

    but yeah, shouldn't be popping off regardless of what the boilers are doing.
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    What's your model number? did you weigh the...

    What's your model number?

    did you weigh the charge?
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    1,243

    You might also have an issue causing high return...

    You might also have an issue causing high return gas temps.

    What were your amp readings on each leg compared to bame plate?
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    pull an oil sample and send it to a lab for...

    pull an oil sample and send it to a lab for analysis.

    and, like was said, pull all the wiring off the compressors and check at the peckerheads.
  25. usually the new units will be shipped with wood...

    usually the new units will be shipped with wood bolted to the bottom that is removed before install, it kinda helps protect the bottom but you should still have longer forks to move them around.

    ...
  26. Thread: Tube delays..

    by 71CHOPS
    Replies
    23
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    1,885

    Damn you guys are old!! :grin2:

    Damn you guys are old!! :grin2:
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    yeah, I will fix it, just don't feel like messing...

    yeah, I will fix it, just don't feel like messing with it this year.
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    house I just bought (new subdivision) has 2 year...

    house I just bought (new subdivision) has 2 year old carrier split......little tiny thing....2 ton maybe. It seemed like it was running a lot when we moved in....finally put some gauges on it,...
  29. Thread: Cng vehicles

    by 71CHOPS
    Replies
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    916

    My buddy works at UPS, they've converted a LOT of...

    My buddy works at UPS, they've converted a LOT of vehicles......he said they do well.

    Might want to take it to a shop that specializes in CNG to have a check up done....sounds like it may need...
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    If there is an engineer involved, you should...

    If there is an engineer involved, you should receive detailed drawings with lists including the exact specified isolators, and where/how they are to be installed.

    you can't just toss isolators on...
  31. Thread: heater sizing

    by 71CHOPS
    Replies
    4
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    848

    yeah, that's what I would pay attention to. all...

    yeah, that's what I would pay attention to. all the electrical is already in place, and if the unit worked before, then just go from the electrical specs.

    personally, I'd be looking at natural...
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    you might have better luck in the controls forum....

    you might have better luck in the controls forum.

    get the model of the AHU controller, have this moved, or start a new thread in the controls section.


    Something else to think about, the...
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    1,017

    You've got to stop and break things down into...

    You've got to stop and break things down into basic components. Nothing in a control system happens without something giving it information......you just have to break each part down and figure...
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    Everybody starts somewhere........ and I'd be...

    Everybody starts somewhere........

    and I'd be lying if I said, I've never taken that approach on a piece of equipment! LOL!!
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    Looks like it's a "smart" sensor....did you put...

    Looks like it's a "smart" sensor....did you put it in learn mode with the motor running? It has to self calibrate.

    also, there's a short note on that sheet that says it doesn't ohm out like a...
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    so they are removing the large single point...

    so they are removing the large single point secondary pumps and installing multiple smaller loop pumps?

    Low Delta T syndrome usually has multiple contributing factors, including piping design...
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    I'm not sure about the Yaskawa, but ABB's have...

    I'm not sure about the Yaskawa, but ABB's have the ability to completely stand alone and control something like an AHU, using multiple inputs and outputs.

    If the Yaskawa has the same...
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    I dunno, it's kind of handy to have the...

    I dunno, it's kind of handy to have the pre-change sample. It gives you a "it was this bad before" baseline! LOL!!
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    as was said, it's likely not necessary, but if...

    as was said, it's likely not necessary, but if they want it done, it's their money.......

    I would pull a sample before changing the oil though, and use that for future comparison of the "new" oil.
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    do you have the right amplifier card in the 7800?

    do you have the right amplifier card in the 7800?
  41. Thread: FML

    by 71CHOPS
    Replies
    34
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    2,530

    I had one like that last year.....maint. guys...

    I had one like that last year.....maint. guys said, "we just looked at it last night, it was quiet as could be!"

    half the bearing was missing, and the shaft had a groove about like that in...
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    whenever you have an electrical issue like this,...

    whenever you have an electrical issue like this, best practice is to turn off all breakers, etc, and check all the equipment BEFORE you start resetting, and trying to restart everything.

    you could...
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    99.7% recovery rate for anyone 80 years and...

    99.7% recovery rate for anyone 80 years and younger........
  44. Replies
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    1,033

    Lightning.

    Lightning.
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    396

    check all the usual stuff then!

    check all the usual stuff then!
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    https://www.americancompressorinc.net/ I've...

    https://www.americancompressorinc.net/

    I've installed several copeland 6D's from these guys....never had any problems.


    If you want to keep it in the family, call remanworld. not only does he...
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    1,117

    Yup, that is a whole other issue....as was...

    Yup, that is a whole other issue....as was stated....DO NOT take responsibility, you should be given specs for exactly what is required.
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    I'm also wondering why the fire guy cares about a...

    I'm also wondering why the fire guy cares about a belt loss.....unless they are using the rtu for smoke ventilation....seems odd.

    You could use a high quality Differential pressure switch for air...
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    If its 100% OA, they should have pressure...

    If its 100% OA, they should have pressure limiting heads on the TXV's also.
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    You're gonna plug some of the passages, but...

    You're gonna plug some of the passages, but that's ok, those coils are designed with the allowance of losing a certain percentage of them anyway.
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