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  1. Thread: Noisy duct

    by mccann
    Replies
    20
    Views
    599

    Balancing damper screw loose?

    Balancing damper screw loose?
  2. Thread: Liebert AC4

    by mccann
    Replies
    2
    Views
    279

    On Lieberts, you need to always shut the unit off...

    On Lieberts, you need to always shut the unit off with the off switch before killing power or it creates a power fail alarm. To reset it you need to power it off correctly again with the off switch...
  3. Replies
    11
    Views
    527

    Why don't vacuum pumps have a check valve?

    Why don't vacuum pumps have a check valve?
  4. Replies
    46
    Views
    2,268

    The solid wires should be pre-twisted together...

    The solid wires should be pre-twisted together with linemen's pliers before putting the stranded to it.
    If putting stranded to a solid or group or solids, strip the stranded longer so the end sticks...
  5. Thread: A/C Renew

    by mccann
    Replies
    31
    Views
    2,411

    We just had the same thing happen on a new...

    We just had the same thing happen on a new Liebert Minimate. After 24 hours it started running great. Suction went from 20# to 65#.
  6. Replies
    84
    Views
    3,475

    Lieberts now come with 407c in them. Many with...

    Lieberts now come with 407c in them. Many with the same R-22 compressors they always had. There's a small difference in settings but no big deal. I do not know if Liebert did a bunch of research and...
  7. Replies
    19
    Views
    1,081

    I find several issues with these units. It's...

    I find several issues with these units. It's hardly redundant. The unit has two compressors and two heat exchangers with no isolation valves, and one very expensive pump. The controller has no useful...
  8. Replies
    19
    Views
    1,081

    Unit is a KKT Kraus, model KSC 215-L-U/S, Bladder...

    Unit is a KKT Kraus, model KSC 215-L-U/S, Bladder style expansion tank which is part of the chiller. Closed loop. No storage tank. One pump. Everything on it is in German. Can't shut anything off...
  9. Replies
    19
    Views
    1,081

    Good idea.

    Good idea.
  10. Replies
    19
    Views
    1,081

    Yes it has an expansion tank. It sounds empty....

    Yes it has an expansion tank. It sounds empty. You are right there must be a leak. It has very thick insulation. I shall not give up.
  11. Replies
    19
    Views
    1,081

    This is a sealed loop.

    This is a sealed loop.
  12. Replies
    19
    Views
    1,081

    Where does the water go?

    We take care of a couple of little Kraus chillers for some MRI machines. We have had to add a little water (perhaps a gallon or two) to them a few times because the suction side of the pump goes down...
  13. Replies
    2
    Views
    273

    What company is that from?

    What company is that from?
  14. Replies
    3
    Views
    354

    Top section of indoor coil dry

    Lennox, 13CHPA-36-230=1A, S#1607K07565, package heat-pump.
    Reported problem: Not keeping up in the afternoon. Goes to a bank in a supermarket.
    Outdoor 105*, outdoor RH 22%, indoor at stat 78*,...
  15. Replies
    11
    Views
    1,321

    Yes, I found out: don't turn on the compressor if...

    Yes, I found out: don't turn on the compressor if there's cleaner in there. Froze up solid in no time. haha.
  16. Excellent info, thank you.

    Excellent info, thank you.
  17. Replies
    29
    Views
    1,708

    Your market experience and attitude makes you a...

    Your market experience and attitude makes you a valuable person to other areas of this field.
    I too liked markets because they were complex and important. I did supermarkets for 20 years. It beats...
  18. Follett ice machine intermittently trip drive amps.

    We have just started taking care of 50+ Follett ice machines in a hospital complex. We get a lot of calls with drive amp trips. Sometimes it has been just ice backing up in the transport tube for a...
  19. Replies
    11
    Views
    1,321

    I see amps the same as you see. They seem to be...

    I see amps the same as you see. They seem to be very picky units. They must make their money on selling bearings.

    I have been finding on some Follett machines if the tube is not perfect; If it...
  20. Replies
    7
    Views
    344

    Was there some issue with power stealing? I see...

    Was there some issue with power stealing? I see most honeywell stats allow batteries and say Common is optional if you have batteries.
  21. Thread: PM check list

    by mccann
    Replies
    26
    Views
    1,267

    Perhaps they know it is ridiculous, but it keeps...

    Perhaps they know it is ridiculous, but it keeps the pressure on the workers to move faster and find a way. Perhaps they just don't have time or skill to take such things into consideration. ...
  22. Thread: PM check list

    by mccann
    Replies
    26
    Views
    1,267

    The reason for these check lists is because of...

    The reason for these check lists is because of the many, very large, national, 3rd party, management companies managing large properties from a distance. Our corporate sales people talk to their...
  23. Thread: C Vs Z charge

    by mccann
    Replies
    8
    Views
    468

    The z charge is for low temp. If it's working, be...

    The z charge is for low temp. If it's working, be thankful. If it's not. Check if you got enough liquid there first. If it's on a system, Valve off other units to see if refrigerant feeds better to...
  24. Thread: PM check list

    by mccann
    Replies
    26
    Views
    1,267

    PM check list

    What do you guys think when they give you little time per unit and a PM check list from the customer that asks for amps of everything, pressure safeties tested, superheats and lots of other things?...
  25. Replies
    17
    Views
    13,139

    One less likely possibility; How is the...

    One less likely possibility; How is the superheat? I had a package unit years ago fling water past the pan because the coil was not being feed evenly. It was dry in sections and water seemed to blow...
  26. Replies
    30
    Views
    2,107

    As to the original question; how long before...

    As to the original question; how long before damage? It depends on the humidity at the time, how open open was, how saturated with refrigerant the oil was, the condition and quality of the drier. ...
  27. Replies
    22
    Views
    1,557

    I don't know. You never really know. I like to...

    I don't know. You never really know. I like to have a core removal tool handy with the core remover stem taken out. If refrigerant starts blasting, you can put the removal tool over the schrader,...
  28. Replies
    3
    Views
    601

    The more they want to change, the more we make...

    The more they want to change, the more we make money.
    Robots will build it so well, it will never need service.
  29. Some units reheat by having a secondary condenser...

    Some units reheat by having a secondary condenser coil in the supply. I thought that cool.
  30. Replies
    28
    Views
    3,099

    Assuming motor is good, coil is clean, pressure...

    Assuming motor is good, coil is clean, pressure control is working correctly, wiring is tight; Data-Aire seems to have this issue; like the P66 is not fast enough on a cold night, when your not...
  31. Replies
    20
    Views
    1,860

    I've saw a big piece of sheet metal blow off the...

    I've saw a big piece of sheet metal blow off the roof up into the power lines and take out the whole building. Does that count?
  32. Replies
    11
    Views
    804

    Supplement your formal learning with Youtube...

    Supplement your formal learning with Youtube videos. Although a lot are terrible, some are ok, and anyway, it gets you a view of moving through equipment and the terminology that's out there. Just...
  33. Replies
    7
    Views
    734

    I have had intermittent low pressure alarms on a...

    I have had intermittent low pressure alarms on a Liebert. New board and switch. Pressure is good. All that is left is the wiring plug or gremlins. Next time all will have some electronics cleaner...
  34. Belimo makes one they advertise with zip-code and...

    Belimo makes one they advertise with zip-code and easy read trouble shooting and alarm. I have not seen one yet. Honeywell liked to make things as unclear and difficult as possible in the past. I...
  35. Replies
    76
    Views
    4,847

    Is that all you got to say? ha ha, very good.

    Is that all you got to say?
    ha ha, very good.
  36. Replies
    28
    Views
    3,099

    I am new to the computer room ACs. I had two...

    I am new to the computer room ACs. I had two separate Data Aire units do this head trip at the same location. I was told it was a problem for a long time because it was not factory fan motors even...
  37. Replies
    40
    Views
    2,235

    point?

    point?
  38. Replies
    40
    Views
    2,235

    If it gets a big leak or if they have other...

    If it gets a big leak or if they have other systems that can use the r-22, I would change it out to 407c to save money for the customer. As for torching the receiver, I try to torch it in a good spot...
  39. Replies
    76
    Views
    4,847

    I agree. It seems stupid to me to run a little...

    I agree. It seems stupid to me to run a little poky freezer in a vacuum if you care about ever having a leak on the low side. They do not care about that or service. They care about production cost...
  40. Thread: Leak repair

    by mccann
    Replies
    38
    Views
    2,716

    Very good Sir. I too was thinking of a saddle....

    Very good Sir. I too was thinking of a saddle. Weld a schrader or a small piece of soft ¼" pipe through a piece of copper pipe bigger than your leak. Cut out a saddle shape around it with a carbide...
  41. Thread: Sight glass

    by mccann
    Replies
    33
    Views
    2,867

    Leak Lock is great. It has saved old flares and...

    Leak Lock is great. It has saved old flares and unions in a pinch.
  42. Replies
    65
    Views
    5,893

    You have to prioritize as a tech. The PM check...

    You have to prioritize as a tech. The PM check list sometimes has crazy stuff like write down the amp draw of some ¼ hp motor. Who really cares? Are you going to change it if it's a little off? No. ...
  43. Replies
    2
    Views
    414

    curs-id non-labelers

    I wish installers would label the t-stat with the corresponding unit number. It's a pain going up and down the ladder to see if your working on the right unit quickly.
    Curse you non-labelers. ...
  44. Replies
    9
    Views
    1,408

    Oh, now I recently saw those check valves. Why is...

    Oh, now I recently saw those check valves. Why is it there? Migration?
  45. Replies
    9
    Views
    1,408

    It is good to have a bunch of those green magnet...

    It is good to have a bunch of those green magnet things to energize all solenoids when evacuating. I don't know the model# of the unit. On the few Mini-mate Lieberts I've seen, I think the solenoid...
  46. Replies
    9
    Views
    1,408

    Most R-22 headmasters start bypassing hot gas...

    Most R-22 headmasters start bypassing hot gas into the receiver at about 180# to maintain head pressure, at the same time refrigerant starts backing up into the condenser coil. Although it is...
  47. Sounds like you make quality stuff. I like taps...

    Sounds like you make quality stuff. I like taps and sensors in as many places as possible. Service valves are better than schrader, less leak potential. Siemens makes good stuff, high quality in...
  48. I would think it's to save money on the...

    I would think it's to save money on the production line in some way or it was just where they put it without engineering deep thought. Need high side port, mmmm, put it there. Get it out the door...
  49. Replies
    18
    Views
    1,754

    I have seen supermarkets get warm because the...

    I have seen supermarkets get warm because the exhaust hoods were pulling out a bunch of the cold conditioned air. The AC couldn't keep up. The MUA units were broken swamp coolers. ha ha. I hate...
  50. Replies
    35
    Views
    4,639

    I recently had a Liebert that had been converted...

    I recently had a Liebert that had been converted to Digital Scroll a year before by others. They changed out the B66 fan control to a VFD. Liebert said the VFD reacts much faster. The head pressure...
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