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  1. How would I trace (find) a circuit from the rooftop down to multiple panels?

    This is a new account and new owners that have no clue and can barely speak english. They bought this small restaurant attached to a gas station. The walk in freezer has never been started. They want...
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    The service valve is in terrible...

    The service valve is in terrible condition.Leaking and stem saw a few channel locks and pipe wrenches. (Ive been using another port near compressor to monitor LP) I'll get one of the staff to help...
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    Can I temporarily remove LLS coil?

    LPC needs adjusting on low temp application..specifically for the pumpdown cycle. Tstat is located inside....several staircases and feet away. Thinking of temporarily removing the LLS coil (which is...
  4. Thank you, gentlemen, for the edumacation. I went...

    Thank you, gentlemen, for the edumacation. I went out on Xmas day to check on the unit and could tell the unit had been starting (compressor warm). I went ahead and installed a (new) 12' self...
  5. cold ambient and having trouble 'making' LPC after LLS solenoid opens

    Got called out today, XMAS eve, for a nuisance problem (again). It seems when we get frigid weather (zero degree, -10 wind chill) this walk in cooler has trouble starting. Here are the parameters....
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    not getting 24v to contactor

    I should say I'm getting one leg. When I measure the red wire - to ground - I get 24 V, but I do not get 24v when I measure across the two low volt legs (Yes the tstat is calling) Further the fan...
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    Let me correct Texas. The icemaker arm must be in...

    Let me correct Texas. The icemaker arm must be in a DOWN position to allow the thing to cycle. Grabbing and turning icemaker ..ahh not really recommended. WHY? Gears are all plastic. You will bust it...
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    I used to work at XDX...

    ..and I can tell you guys exactly what is in the 'secret valve" Nothing. Nothing except (as a previous poster accurately described) copper tubing w a tee. When I first started there, I cut those...
  9. Gosh isn't that the truth. I started in this...

    Gosh isn't that the truth. I started in this business in 1979 doing nothing but domestic refrigerators. (NO I'm not an appliance repair person, I'm a refrigeration man..dammit!) Thru the 80's amp...
  10. If the capacitor has failed the motor...

    If the capacitor has failed the motor (compressor) usually doesn't run at all. If it is weak the motor will run at a higher amperage and will run hotter. Either way it's a no good sitcheeation.
    ...
  11. I'm mainly referring to 1 ph compressors.. ...

    I'm mainly referring to 1 ph compressors..

    BTW...power factor correction devices (capacitors) can be installed on 3 phase equipment
  12. Why dont we see more run caps on commercial...

    ...refrigeration compressors. yea I see a few now and then but it not like a residential AC unit where EVERY unit has a run cap (to increase power factor). Maybe the mfg's (copeland, tecumseh,...
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    Wonder how the dog liked sleeping next to the...

    Wonder how the dog liked sleeping next to the unit....?
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    Why dont we see power factor correctors (run caps) on refrigeration units

    Great thread guys but it leads me to a couple of questions. If power factor correction (run capacitors) are used on nearly all residential AC units (and on some newer domestic refrigerators) why dont...
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    What is best condenser coil cleaner?

    Sometimes high pressure gases aren't enough. And acid based chems are very messy especially if water rinsing is required inside a restaurant. Double the problem if the condenser is on top of the walk...
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    Yea I've had to draw for electricans in the past....

    Yea I've had to draw for electricans in the past. That is what I did with this problem. Once you got me the idea, I sat down and drew it. I would like to post the diagram for the benefit of somebody...
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    Yea ..got it now. Went there today, wired it up...

    Yea ..got it now. Went there today, wired it up as I sketched it out and WahLa ..off and running she goes. Adjusted LPC to proper sets and everyone is cool. BTW,,Customer explained he shuts off the...
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    1,832

    I would love to.... just don't know how to post a...

    I would love to.... just don't know how to post a sketch:rolleyes: Inform me how to upload a sketch and I'll try. I have it on paper and cant wait to get back there tomorrow to giter done. (and get...
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    That's it!! I beleive this will work. BTW...LPC...

    That's it!! I beleive this will work. BTW...LPC is cutting in about 12 psi, and off at 4-5. It was never an issue with the LPC because I could never get the contactor to pull in when I (mistakenly)...
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    LPC is properly set. Prob is power isn't even...

    LPC is properly set. Prob is power isn't even making it to the LPC because the contactor isn't being pulling in. For an experiment I wired TStat back to original and all works well. (I have LLS...
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    problem adding (wiring) a pumpdown cycle

    This customer of mine has lost two compressors in the last seven years.
    (Med. temp remote unit 1 HP 208/230, 1ph, R12 coverted to Hot Shot.) Happens in winter. I'm suspecting flooded starts due to...
  22. Wait let me guess.. lack of PM with the acid...

    Wait let me guess.. lack of PM with the acid cleaning of the evaporator, led to the ultimate failure. Once they get all 'gummed' up there is no turning back. Evaps need to be replaced.

    Maybe his...
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    Get a tech service manual from your nearest...

    Get a tech service manual from your nearest Scotsman dealer if you dont have one already. Then budget a couple of hours to sit and watch. My experience with icemachines is you must spend some time...
  24. I can't offer ya much help here bro...you've done...

    I can't offer ya much help here bro...you've done more evap changes than I, but if I was in your shoes, I'd contact Manitowac directly. Their tech support is very helpful as you probably know. You...
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    Some need to re-read the original post. Once the...

    Some need to re-read the original post. Once the pinch off has been applied, the pig tail will be WITHOUT pressure. Thanks to those that have performmed this quick and effective 'field expediency' (I...
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    LLS valve chattering.....I GOT IT !!

    Gents the culprit was indeed the defrost clock. I changed the clock and all operation were normal Yipe! I have a temp logger deployed and will confirm in a few days what I get.

    Now can somebody...
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    LLS Chattering follow up report

    I dont think I have an issue with the LLS at all. Here is what I found. I'm still confused

    It's a Russell 1 HP split system, R-22, 208/230/1. (MLH100L44) At first I was looking for a refrigeration...
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    pinch off tool

    In HVAC 101, we were all taught never to apply heat to a system under pressure. In all my years in the service business I've never used a pinch off tool. I may have a need to use one now as I have a...
  29. Try this link:...

    Try this link: http://www.mccallrefrigeration.com/Store/OnlineCatalog.asp

    If this doesn't work, just google the model number

    Good luck
  30. Replies
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    That is pretty cool. I'm looking for an old...

    That is pretty cool. I'm looking for an old refrigerator with the condenser on top. Any clues where to find?
  31. Thread: NFL Week Six

    by vettehead
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    509

    Bears coaches stink

    Bears coaches stink
  32. Yea letting him know now is the honorable thing...

    Yea letting him know now is the honorable thing to do for him and his family. He'll have more opportunity to plan or shop his skills.

    My 2 cents
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    I dont dwell on what other techs / businesses...

    I dont dwell on what other techs / businesses have poorly done. I. too, feel it makes you look bad.

    "It's been like this for X years" is something we all have to deal with ...with our customers....
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    I agree with post below. 3000 microns is not good...

    I agree with post below. 3000 microns is not good enough. Moisture left behind may freeze at cap tubes and no cooling results until temps rise to where moisture thaws and refrigeration begins again....
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    Thanks Leo. I always thought the LLS opened and...

    Thanks Leo. I always thought the LLS opened and closed on coil voltage. Period. Either open or closed...no grey area. Are you saying if the pressure on the 'front' side of the LLS is too low, the...
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    Chattering LLS on small WIF

    I ran across a small WIF that was only able to get to 20F. Tstat was calling so LLS was open and unit running. Once I got back to the roof the liquid line was making all this chatter. I ran back...
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    chaterring LLS on WIF

    I ran across a small WIF that was only able to get to 20F. Tstat was calling so LLS was open and unit running. Once I got back to the roof the liquid line was making all this chatter. I ran back...
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    sizing questions

    most WIC mfg's are very helpful in getting the right sizing for a specific application. Dont completely disregard the counter guy. Some long time guys are pretty good
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    it's a Honeywell modulating gas valve. It opens...

    it's a Honeywell modulating gas valve. It opens fully (high fire) when second stage htg is called. Otherwise it sits in first stage (low fire). There is linkage with a pointer arrow showing which...
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    No it's a Honeywell modulating valve.

    No it's a Honeywell modulating valve.
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    Applied Air Heat unit - low fires only

    Let me preface by saying I am a refrig service guy and totally green to this commercial heating stuff that has been dropped on my lap with this new position I've taken. I'm very eager to learn....
  42. Thread: superheat

    by vettehead
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    1,106

    Evaporator SH is measured very near TXV bulb....

    Evaporator SH is measured very near TXV bulb. Compressor SH is typically measured 6" from compressor inlet. Hope this helps. After reading the question again...YES Compressor SH will undoubtedly be...
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    economizers re-engineered? HELP

    At the mfg. facility where I was recently hired, we have a "HVAC guy" who wants to keep the entire building at a slightly positive pressure. Fair enough. Currently the economizer actuator motors are...
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    These types of jobs crack me up. There's a lot of...

    These types of jobs crack me up. There's a lot of re-engineering out there. Usually done by the business owner that thinks you can 'just change a thermostat' to make a freezer a cooler. Explain to...
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    Viessmann Vitola 200 question

    I am getting an occasional (3-4 times per season) 'burner fault' error from my Vitola 200. ..which shuts the burner down until I manually reset. This unit is in my home only 4 years old and never...
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