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  1. Replies
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    A few "rules" might have to be obeyed. Typically...

    A few "rules" might have to be obeyed. Typically you want your cooling tower water to be a certain amount of degrees over your chill water. That depends on your chiller. Ten degrees is usually a...
  2. Thread: Megger readings

    by Russ57
    Replies
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    2,102

    Rules of thumb can equal bad practice. Many...

    Rules of thumb can equal bad practice. Many would assume a 3 phase, 480 motor operates at 480 volts referenced to ground.....but it doesn't:) Since you have one end of the megger on ground you need...
  3. Thread: Megger readings

    by Russ57
    Replies
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    2,102

    You might find the following link helpful. ...

    You might find the following link helpful.

    http://www.biddlemegger.com/biddle/Lowdown-MC.pdf
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    It does get a little cloudy at times:) There...

    It does get a little cloudy at times:)

    There are certainly positive displacment pumps with pistons. Then you have centrifugal chillers that compress refrigerant with an impeller.
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    Your best bet will probably be a "shotgun"...

    Your best bet will probably be a "shotgun" approach. Call up True (800-424-TRUE) and give them model and serial number. You will want to buy the start capacitor, overload, and start relay. Those...
  6. Most walk in's have a "defrost termination and...

    Most walk in's have a "defrost termination and fan delay switch". This is mounted on the evaporator.

    When you go into defrost mode this switch lets the defrost heaters remain energized until the...
  7. Wait a second.....you mention something that we...

    Wait a second.....you mention something that we assume is a 115 volt home unit and next thing we know you are talking three phase. World of difference between something that is using a start cap and...
  8. Thread: Vacuum question

    by Russ57
    Replies
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    727

    Well....if you are at zero, or below as you have...

    Well....if you are at zero, or below as you have stated, and it stays that way, haven't you proven the valves hold?
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    Funny how you can make a walk-in mantain temp...

    Funny how you can make a walk-in mantain temp with a tsat and still have a lot of things wrong. It is a little harder to do that with just a pressure control.

    Do yourself a favor. Learn how to...
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    Yes, I am debating fighting it. But we have a...

    Yes, I am debating fighting it. But we have a great relationhip with the inspector and I'd like to keep it like that.

    A switch in series with the "4" terminal and the loads is the quick and dirty...
  11. Replies
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    I'm going to have to get up there and see what...

    I'm going to have to get up there and see what all I have. It turns out both evaporators are hard wired 208. Best I can remember, when I installed A419's in them, one had to be wired for 208 but...
  12. Replies
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    No. The 120 volt one just plugs into a ceiling...

    No. The 120 volt one just plugs into a ceiling mounted receptacle. The 208 volt one is all hardwired.

    Kinda looking to find out if NEMA 4X and/or low voltage is required.
  13. Replies
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    2,020

    Always best to ask

    My fire department inspector says we need a switch inside the walk in freezers to kill the evaporator fans in case someone gets trapped inside.

    These are normal pump down type systems. One...
  14. Replies
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    Bigtime, just all depends on conditions...

    Bigtime, just all depends on conditions (temps/humdity/etc). You could get away with stuff in some parts of the country that would never fly in others.

    These days I wouldn't even design with a...
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    You would always want primary flow to be larger...

    You would always want primary flow to be larger than secondary flow. You can violate that for short periods but doing so for any degree of time will cause lots of problems with humidity and such.
  16. Also.....lower voltage cause higher amperage "if"...

    Also.....lower voltage cause higher amperage "if" torque is required. In other words torque is proportional to square of voltage. Motors that are being started at reduced voltage are usually seeing...
  17. Replies
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    I would be careful saying a run capacitor's main...

    I would be careful saying a run capacitor's main job is to correct power factor.

    I'd rather say the capacitor shifts the phase of one of the windings so that the voltage across the winding is at...
  18. Replies
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    Not only is the voltage rating higher on the FNQ...

    Not only is the voltage rating higher on the FNQ series, the interupting current rating is WAY higher. If you don't know the importance of I.C. rating then best you make sure you always put the...
  19. This is the Ask Our Pro's forum. In order to post...

    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread....
  20. Thread: Pics for zw17

    by Russ57
    Replies
    0
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    503

    Pics for zw17

    Here are the pics for the old tube base Barber Coleman controls. This particular one isn't on-line anymore but I do have some that are.

    As you can see I have quite a mix of different "vintages".
  21. Replies
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    There is a reason why there are megger...

    There is a reason why there are megger tests....and then they are hi-pot tests.

    A megger test is supposed to be non-destructive. Every insulation class has a rating. We are supposed to be...
  22. Replies
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    For normal electrical stuff there is little...

    For normal electrical stuff there is little reason not to reference control voltages to ground. However there are a lot of valid reasons for floating neutrals and grounds. I work at a hospital and...
  23. Replies
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    7,338

    I love my old hand crank Biddle. If buying new...

    I love my old hand crank Biddle. If buying new today I'd go AEMC.

    Match the megger to the voltage classes you work with. If you work on 4,160 motors you need a 5,000 VDC unit.

    IMHO top uses...
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    Hmm, so now I'm a liar? Let me get through this...

    Hmm, so now I'm a liar? Let me get through this hurricane and I'll see if I can figure out how to post a pic.

    Pray tell, what is better about a 10mm?
  25. Replies
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    A combination of PH, conductivity, and nitrate...

    A combination of PH, conductivity, and nitrate levels will give you an idea of how much you are leaking. Leave the regulator on. There is no such thing as too much water but you can certainly have...
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    Yes, I did mean an EPR valve. BTW, thanks for...

    Yes, I did mean an EPR valve. BTW, thanks for the education above. I don't normally work on stuff quite like this.
  27. Replies
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    Cv equals GPM times (the square root of specific...

    Cv equals GPM times (the square root of specific gravity of the fluid over the pressure drop across the valve). Perhaps an easier way is to say, "Cv is the number of gallons per minute, at 60...
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    I have to admit to not being sure what I should...

    I have to admit to not being sure what I should do. Too bad work isn't interested in me adding a CPR and check valve.

    I think I'll put it back in service, order a TXV, and install it later on.
  29. Replies
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    That ain't nuthin. My liebert has pnuematic...

    That ain't nuthin. My liebert has pnuematic controls. 1978 vintage IIRC. Runs like a top.

    Now if you want a real laugh....I have AHU controls.....old barber-coleman....that run on vacuum...
  30. Replies
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    Don't guess. Get the performance chart and see...

    Don't guess. Get the performance chart and see if the compressor is operating correctly. Not enough info is given to say for sure.
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    Hard and fast rules are what gets begineers in...

    Hard and fast rules are what gets begineers in trouble.

    It is easy to say "charge by SC with a TXV and charge by SH with an orifice". However such rules assume the TXV or orifice and working as...
  32. Replies
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    What is the suction pressure on your chill water...

    What is the suction pressure on your chill water pump? Does the regulator have a part# on it? Why do you think it is letting too much water in?

    Glad the B&G link helped. Chill water systems...
  33. Replies
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    The frig section whichs setpoint just fine. ...

    The frig section whichs setpoint just fine. Maybe I don't really have a problem? If I understand you right I'm basically running a -30 evap with 80 degrees of superheat. TXV body is very cold but...
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    Password??? Another of my pet peeves. Systems...

    Password??? Another of my pet peeves. Systems with factory default passwords that can't be changed that anyone can find out about.

    When the control vendor comes to my site I want him to need me...
  35. Replies
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    A CRO is piped on the outlet of the evap and a...

    A CRO is piped on the outlet of the evap and a metering device would be piped on the inlet side of the evap (for quick check if not sure of what you have). In the pic it looks like you have a cap...
  36. Replies
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    The separator is piped to the expansion tank. ...

    The separator is piped to the expansion tank. Better I give a link. Didn't want to write an essay. This should work.

    http://completewatersystems.com/wp-content/uploads/2011/12/A-307A.pdf
  37. Replies
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    This is why I ask you guys questions. Blows my...

    This is why I ask you guys questions. Blows my mind to see a higher suction pressure with just the freezer running than just the frig running.

    Still have to think the frig TXV is bad. It runs...
  38. Replies
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    Okay, one chill water pump only??? If so you...

    Okay, one chill water pump only???

    If so you have variable pumping through the chiller. I would certainly cut off the bypass ports on the 3-way valves at the air handlers. Ideally there should...
  39. Replies
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    ONICON is nice but it costs money. The other way...

    ONICON is nice but it costs money. The other way is free. The guy might even learn something to boot:) Easy enough to enter the calculation into the BAS and spit it out on any graphic page you...
  40. Replies
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    I need medium temp...for frig section. And yes,...

    I need medium temp...for frig section. And yes, right now.
  41. Replies
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    Damn, you are right....that is a low temp valve. ...

    Damn, you are right....that is a low temp valve. Very little room. I guess I can get a bushing in there.

    Any thoughts on what sort of suction pressure I should see when on the refrig solenoid is...
  42. Replies
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    I suppose it solves a problem I don't need...

    I suppose it solves a problem I don't need solving. I have no need for a web interface. I don't care much about fancy graphics. I want a robust simple system not dependent on anything but some...
  43. Replies
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    42 chill water supply and 50 degree chill water...

    42 chill water supply and 50 degree chill water return says a lot. How old are the air handlers?

    Venting air may be doing more harm than good. The tank needs a certain amount of air in it. ...
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    IMHO CSI/INET is great stuff. If you understand...

    IMHO CSI/INET is great stuff. If you understand voltage dividers, how to scale inputs with Y= MX + B, and the calculations part of it....you can make it do anything. I also consider my BAS mission...
  45. Replies
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    The cheapest way will require that you can get...

    The cheapest way will require that you can get some info from whoever made the chiller. Most newer chillers have some pretty good sensors on them. So you should know supply and return temperatures....
  46. Replies
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    Quick question....before I make a mistake

    I have a two door reach in I'm working on. Freezer on the top, refrig on the bottom. Tstats, Txv's, LL solenoids for each. Unit runs R404a. It is made by Gem and designed for pharmacy/lab...
  47. Replies
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    Not to threadjack but are all tstats suited for...

    Not to threadjack but are all tstats suited for both applications? I just worked on two different lab refrig's. Both had danfoss kp71/060L2010 controls. One had the bulb in the return air stream...
  48. Replies
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    Wouldn't hurt to check evap superheat. Might...

    Wouldn't hurt to check evap superheat. Might need to open up the txv a bit.
  49. Replies
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    Hey we have all been new and didn't know all the...

    Hey we have all been new and didn't know all the answers at some point. It is tough when your boss throws you the responsibility for something you don't understand. The guy sounds like he knows the...
  50. Thread: Silly question

    by Russ57
    Replies
    8
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    1,233

    That would be before...or after the compressor...

    That would be before...or after the compressor stops?
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