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  1. Replies
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    If there is a temperature rise on the condenser...

    If there is a temperature rise on the condenser coil and the suction at the compressor is some reasonable # like < 55 degrees it's safe to say the unit is doing something...There is no way to tell...
  2. 24vdc power is separate from the control signal....

    24vdc power is separate from the control signal. The ALC boards that we use IO Pro something or other have a jumper selectable output but the control program has to be setup to control it properly....
  3. Make sure you don't have and voltage between...

    Make sure you don't have and voltage between neutral and ground. That can screw up flame rectification...One of the few reasons why polarity would matter...Loose neutral in the panel or somewhere in...
  4. Replies
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    609

    Aqua snap would be a 30ra air cooled that starts...

    Aqua snap would be a 30ra air cooled that starts a 10 tons. Good machine but probably way more expensive then a smaller process chiller.:eek:

    Sorry after I posted what I thought I knew I saw this...
  5. Thread: TXV

    by Hrdworkingacguy
    Replies
    22
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    1,258

    If the indoor txv "stuck" in heat then became a...

    If the indoor txv "stuck" in heat then became a restriction In defrost mode I can't see how the outdoor would freeze. If the indoor txv became a restriction in heat mode, seeing how it is after the...
  6. Replies
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    The only correct answer is ABB. :eek:

    The only correct answer is ABB. :eek:
  7. 558871Here is my take on this problem...The motor...

    558871Here is my take on this problem...The motor might be wrong not sure...:eek:
  8. Replies
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    1,878

    If you were talking to me, I mean liquid...

    If you were talking to me, I mean liquid line...The bottom of the condenser is liquid and if the line comes off the bottom you can free return oil to the evaporator on the off cycle when the...
  9. Because I can't exactly make sense of the last...

    Because I can't exactly make sense of the last post but at the end its says "just need some clarification" here goes...

    Sub-cooling indicates a liquid level in the condenser, 0 being empty and the...
  10. I guess I should explain what going on instead of...

    I guess I should explain what going on instead of being an a-hole like the last post. Since you have to compress gas to a high enough pressure to move heat into the outside air, the larger the cooler...
  11. The larger the cooler the lower the delta t...

    The larger the cooler the lower the delta t across it. If you use ambient plus anything for a "rule of thumb" you should introduce yourself as an AC mechanic because you aren't being technical enough...
  12. Replies
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    1,667

    I looked at the earliest manual I could find and...

    I looked at the earliest manual I could find and it was a 2008 boiler that had the external vfd for the motor. On that machine the O2 range is like 5% at 100% fire rate and it goes to like 6.8% at...
  13. Replies
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    1,667

    I am master certified for aerco for whatever that...

    I am master certified for aerco for whatever that is worth. Your O2 numbers can't be right. O2 over 10% will blow the flame out...that boiler is older then anything I have worked on but...

    Does it...
  14. Replies
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    1,489

    Never seen that unloader before. Is that a hot...

    Never seen that unloader before. Is that a hot gas bypass vs a suction cut off style? :eek:
  15. Replies
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    1,878

    The liquid line probably comes strait out of the...

    The liquid line probably comes strait out of the condenser and goes down through the roof. I always make an inverted trap at the condenser and bring the liquid line 1/2 way or so up the height of the...
  16. Replies
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    1,648

    You don't need scoops on a static pressure...

    You don't need scoops on a static pressure designed system. A velocity system possibly. If it's a straitish run of square duct with take offs then scoops are a waste of time. :eek:
  17. This is an incredibly bad idea. A 48va...

    This is an incredibly bad idea. A 48va transformer is <2amps @ 27volts. If the transformer has a circuit breaker its probably a 75 va with a 3.2a trip point. But I think I saw blowing the fuse on the...
  18. Replies
    64
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    2,543

    Can draw a picture on my phone but it basically a...

    Can draw a picture on my phone but it basically a aux contact from the contactor paralleling a control relay creating a holding circuit that is broken by a lp control or a timer. Will pump down once...
  19. Replies
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    2,184

    If the line voltage doesn't change much when it...

    If the line voltage doesn't change much when it fails but the current or voltage reading at the igniter drops it has to be the board or the wire between the board and the ignitor...

    If you can't...
  20. Replies
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    2,543

    I don't do residential or light commercial...

    I don't do residential or light commercial anymore...but when I had to hire guys in the past I could get a very good sense of where people are just by talking about their last few jobs...what they...
  21. Replies
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    709

    I love my dv-200n 's...best pump on the market...

    I love my dv-200n 's...best pump on the market imho. Pulled down a 860 ton chiller over night with triple evac. I replace the tree fitting with a 1/2" pipe thread x 3/4" ref hose adapter then reduce...
  22. The fact that it's intermittent I would look to...

    The fact that it's intermittent I would look to things that don't happen every cycle. Heat pumps in az that rarely go into defrost with a rubbed wire on the rv coil will pop a fuse in defrost...:eek:
  23. The 485 side is the boilers, the 232 through the...

    The 485 side is the boilers, the 232 through the 485 converter(that is powered off the acs 12vdc) would go to their protonode...you need to enter pw of 6817 and set the acs to network and enable mod...
  24. Replies
    29
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    2,498

    I have 4 or 5 fluke meters(one is a cap tester...

    I have 4 or 5 fluke meters(one is a cap tester from meterman that I am told is made by fluke or was)

    But my best meter that i can't function without is a fluke 289
    ...
  25. Replies
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    5,299

    Essentially Black is common, Yellow is run, and...

    Essentially Black is common, Yellow is run, and Brown is start...Brown to yellow "Should" have the most resistance. Black to Brown the second highest, and Black to yellow the least...A volt meter can...
  26. Replies
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    7,681

    Keep the parts you don't want melted wrapped with...

    Keep the parts you don't want melted wrapped with a rag, make sure everything is clean, use the right torch tip, go hard, go quick and get it done, then cool it off...:eek2:
  27. Thread: Txv

    by Hrdworkingacguy
    Replies
    6
    Views
    760

    When you say 100 degree air cooled to 70...

    When you say 100 degree air cooled to 70 "upstream", is that unit ducted into this unit? or is it a plenum return and its just dumping tempered OSA above the ceiling or into the space? If its ducted...
  28. When you have high superheat, and high sub...

    When you have high superheat, and high sub cooling, the liquid is in the condenser...The only thing that will cause that is liquid restriction of some kind(plugged drier, underfeeding TXV,...
  29. Replies
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    2,547

    If its in a place where you can afford it being...

    If its in a place where you can afford it being down a day or two, I would wait until it dies...Its better(imho) to bring in the carcass of a dead compressor for warranty, then risk getting jerked...
  30. All three circuits share the same return and...

    All three circuits share the same return and OSA??? The difference in SC/SH is the txv and/or the adjustment nut...All three circuits seems underfeeding to me...Possibly the outdoor coil is...
  31. What are your water temps??? Do you have just one...

    What are your water temps??? Do you have just one of these or are there a two paralleled together, is so do they isolate when they aren't running? :eek2:
  32. Replies
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    2,533

    These don't care....But if your differential...

    These don't care....But if your differential pressure is low and the pump is auto-reversing, switching the direction can "sometimes" give you better differential pressure...:eek:
  33. Replies
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    2,533

    Is it a Copeland discus compressor? I have a...

    Is it a Copeland discus compressor? I have a couple 25hp and 35hp in a 100ton unit...I had a similar problem...differential pressure was like 7psi fully loaded...Those compressors run like 30-40#...
  34. Replies
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    1,097

    The bumping is from transistors of some sort...

    The bumping is from transistors of some sort opening and closing in the end bell of the motor(the drive part)...The motor is actually a 3 phase DC motor in a lot if not all cases...I have personally...
  35. Replies
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    1,097

    ECM motors that rock like that are usually otw...

    ECM motors that rock like that are usually otw out from what I have seen...:eek:
  36. Replies
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    It looks on the surface like liquid restriction...

    It looks on the surface like liquid restriction type symptoms...If the tech was messing with the txv he might have suspected that also and might not want to replace it under warranty...:eek:
  37. Replies
    12
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    1,315

    I should say if it used to work and now doesnt...

    I should say if it used to work and now doesnt then bad board...Last time that same thing happened to me I pulled the board and flipped it over to find it crispy...:eek:
  38. Replies
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    1,315

    Bad board :eek:

    Bad board :eek:
  39. Replies
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    7,183

    19xrv centrif or 23xrv screw = best chillers on...

    19xrv centrif or 23xrv screw = best chillers on the market today...I like turbocor a lot but those two carrier machines own all...:eek:
  40. If you have the newer style motor protection...

    If you have the newer style motor protection module there is a service bulletin that says you need to install a bypass timer in parallel with the oil safety control...The control just opens when the...
  41. Replies
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    5,028

    I saw something online showing a 60/5uf at 370v...

    I saw something online showing a 60/5uf at 370v run cap for that unit...The three identical ohm readings are a little weird...look at the electrical data on the compressor label, does it say 3 phase...
  42. Replies
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    2,308

    condensation happens when something is lower...

    condensation happens when something is lower temperature then the dew point...It condenses the moisture in the air...If something doesn't have access to air it can't create condensation....thats why...
  43. Replies
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    4,096

    Cast iron would be "ideal" but isn't...

    Cast iron would be "ideal" but isn't required...Ive done both and they are just different...one isn't better then the other...:eek:
  44. Replies
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    4,096

    Sometimes I will render the fat out of bacon and...

    Sometimes I will render the fat out of bacon and make a roux with that...Depends on what i'm making...gumbo brown or black roux is easier but takes alot longer if you cook it in an oven for a...
  45. You can't win when it comes to 410a conversion...

    You can't win when it comes to 410a conversion from a 22 system...Trane says it doesn't matter, units with run with 50% PoE oil, 50% mineral oil...CPS sells gauges that do both refrigerants and says...
  46. Replies
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    437

    I might know somewhere...Does he have any...

    I might know somewhere...Does he have any schooling...:eek:
  47. Replies
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    515

    No, blood is good enough...Others will ask for...

    No, blood is good enough...Others will ask for the turn your head a cough thing but thats on them...:eek:
  48. Replies
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    Eddie Murphy Raw = best of all time.... Best in...

    Eddie Murphy Raw = best of all time....
    Best in the last 10 years = Richard Jeni Greatest Bits
    Best of 07' = Lewis Black Red, White, and Screwed...

    My opinion only...:eek:
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    I would talk to management...:eek:

    I would talk to management...:eek:
  50. Replies
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    In the situation the OP talks about I would be...

    In the situation the OP talks about I would be looking to the person who bid/sold the job that said it was 8 hours and gave you nothing to go on...You can't possibly go to a job with 1/10 of the...
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