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  1. Thread: Question??

    by hands
    Replies
    11
    Views
    328

    There's an old saying, A/C work is just sloppy...

    There's an old saying, A/C work is just sloppy refrigeration work.
  2. Replies
    3
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    152

    One is just as bad as the other.

    One is just as bad as the other.
  3. If you posted the gas pressures correctly, the...

    If you posted the gas pressures correctly, the unit is over fired. You should have -.2" WC.
  4. Thread: wshp

    by hands
    Replies
    16
    Views
    258

    Whatisthesuperheatandsubcooling?

    Whatisthesuperheatandsubcooling?
  5. You said the INDUCER motor was replaced. It's...

    You said the INDUCER motor was replaced. It's actually called a Combustion Blower, this unit doesn't have induced draft. As far as I know, Trane doesn't sell just the motor, so whoever replaced it...
  6. I would say that a 70* temperature rise and a...

    I would say that a 70* temperature rise and a 180* Hi-Limit would be normal. You need to be careful about replacing a Hi-Limit without knowing what it should be. If the unit has been overheating and...
  7. Replies
    7
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    303

    What I have read about the Testo 510, it doesn't...

    What I have read about the Testo 510, it doesn't read negative pressure. Is this incorrect?
  8. Replies
    7
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    303

    Digital Manometer

    I would like to get a digital manometer that will also read negative pressures since I work on a lot of Trane RTU's. Several guys have told me that the digital manometers are not very accurate. I...
  9. Replies
    46
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    1,902

    That's funny, I think "hack" when there isn't...

    That's funny, I think "hack" when there isn't electrical tape on a wire nut and the nut has worked loose and the wire has shorted.
  10. Replies
    13
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    708

    The manifold gas pressure should always be...

    The manifold gas pressure should always be checked after doing a repair on a burner or heat exchanger. For that matter, it should be checked yearly while doing the Fall maintenance.
  11. Replies
    14
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    569

    So you think that with winter temperatures of -26...

    So you think that with winter temperatures of -26 F that old people will have their windows open all the time? Is this something you would do in your house?
  12. Replies
    14
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    569

    I wouldn't think that windows could be used for...

    I wouldn't think that windows could be used for minimum outside air requirements in the rooms.
  13. Replies
    8
    Views
    429

    So did you actually see flame with the combustion...

    So did you actually see flame with the combustion blower off? When the combustion blower did run and the burner fired, what was the gas pressure?
  14. Replies
    22
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    917

    [QUOTE=mixsit;18991981]'Cause I didn't do this.....

    [QUOTE=mixsit;18991981]'Cause I didn't do this..

    You stated in your original post that you did.
  15. Thread: Evap coil repair

    by hands
    Replies
    8
    Views
    497

    I have made repairs like that on condenser coils....

    I have made repairs like that on condenser coils. I used a hacksaw blade to cut the copper tubing and blew nitrogen through the system to remove the shavings. I then used a piece of larger tubing...
  16. Thread: HVAC Consultant

    by hands
    Replies
    4
    Views
    562

    A lot of travel time and long wait time for...

    A lot of travel time and long wait time for someone to let you in the fenced area. I had a service call at one and couldn't even drive my van up the very long and steep hill. The maintenance guy that...
  17. Replies
    19
    Views
    987

    Most process chiller water loops are not a sealed...

    Most process chiller water loops are not a sealed loop. So there will be evaporation over time. If it is a glycol mixture, you will need to check the glycol % when the water loop is low because the...
  18. Replies
    17
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    1,389

    I have seen a lot of problems with Trane units...

    I have seen a lot of problems with Trane units over the last several years. I have a customer that has mostly Trane units. In the last four years, there have had nine RTU's installed. Eight of them...
  19. Replies
    3
    Views
    375

    If the subcooling looks good and you don't have...

    If the subcooling looks good and you don't have an airflow problem, you will have to adjust the TXV. But I would make sure the evaporator is clean. I just went through similar problem with a RTU,...
  20. Thread: BDP RTU problem

    by hands
    Replies
    5
    Views
    591

    Well, I got back to the unit today and found that...

    Well, I got back to the unit today and found that the evaporator coil was dirty, especially on the lower half which is circuit #1. So I would say it did have ice on it the other day when I was having...
  21. Thread: BDP RTU problem

    by hands
    Replies
    5
    Views
    591

    I haven't been able to check the unit any...

    I haven't been able to check the unit any further. It is possible that circuit #1 had ice on it, but circuit #2 ran fine. I didn't check it out very good due to the rain. I hope to get back to it...
  22. Thread: BDP RTU problem

    by hands
    Replies
    5
    Views
    591

    BDP RTU problem

    I was doing the PM on BDP RTU, M# 580DEV120180AAAA. I found that ckt#1 was tripping on low pressure and the suction line was frosted from the evaporator to the compressor. I added 1 lb. of R-22 which...
  23. You should check it at the outlet of each...

    You should check it at the outlet of each evaporator coil as you would with any system. I would setup each circuit by itself, then run both circuits together and check them again.
  24. Replies
    2
    Views
    271

    filter-drier pressure drop.

    I was just wondering what kind of pressure drop across a filter-drier core you guys change the core. It seems that I remember reading that when it gets to 3 psi above the starting pressure drop, you...
  25. Thread: leak testing ?

    by hands
    Replies
    12
    Views
    638

    I think it's just the temperature difference. If...

    I think it's just the temperature difference. If you have the time, you could watch the pressure to see if it goes back up to 170 psi as the ambient temperature goes up. Put I would start evacuating,...
  26. Replies
    8
    Views
    575

    I have repaired several leaks on the factory 90...

    I have repaired several leaks on the factory 90 right off the compressor. This is very common on Trane equipment. I have always just brazed over the leak, but put a heavy coating of sil-foss over...
  27. Replies
    12
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    764

    Staybrite #8 will not stick to braze, I have...

    Staybrite #8 will not stick to braze, I have tried it. But you can braze over staybrite, and yes I have done it.
  28. Replies
    34
    Views
    2,045

    Why don't you just braze in your fitting and then...

    Why don't you just braze in your fitting and then braze around the soft solder fittings that you are worried about. You can braze right over solder with no problem. You could also just cut out some...
  29. Thread: Laptops

    by hands
    Replies
    7
    Views
    635

    My company gave all Service Techs net books to...

    My company gave all Service Techs net books to use. We do electric service reports with them.
  30. Thread: Work Pants

    by hands
    Replies
    52
    Views
    4,593

    I like Dickies Carpenter jeans. They are made...

    I like Dickies Carpenter jeans. They are made well and hold up good.
  31. I would think every service tech could sweat...

    I would think every service tech could sweat loose a solder joint and re-solder it. If they couldn't, they would have a problem changing a compressor. As for the solders he mentioned, Stay-Brite #8...
  32. I would just sweat it loose, clean the joint...

    I would just sweat it loose, clean the joint good, flux it and solder it with 45% silver solder.
  33. Replies
    5
    Views
    332

    I get them from Air Filters Direct in Cincinnati.

    I get them from Air Filters Direct in Cincinnati.
  34. Replies
    30
    Views
    1,970

    Why don't you just send a tech that knows what...

    Why don't you just send a tech that knows what he's doing, recover the charge, replace the liquid line filter drier, evacuate the circuit and charge it. This would be the right thing to do and would...
  35. Thread: r22 at 300 psig?

    by hands
    Replies
    30
    Views
    2,138

    With a space temperature that low, the suction...

    With a space temperature that low, the suction pressure will be low and the evaporator coil will freeze up. They might be trying to keep the head pressures up which will also make the suction...
  36. Replies
    18
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    892

    Sounds like one fan is moving all of the air and...

    Sounds like one fan is moving all of the air and the other fan is freewheeling. Try starting out with both fans at say 20 Hz and increase them at the same time and see if the amps stay closer. Have...
  37. Replies
    4
    Views
    371

    I attended a class on compressor rebuilds. The...

    I attended a class on compressor rebuilds. The guy giving the class said that a full remanufactured compressor, even from Carlyle, still uses mostly used parts. He said that they only replace the bad...
  38. Thread: Leak on HP

    by hands
    Replies
    16
    Views
    988

    I would consider 5 psi every 3 hours a large...

    I would consider 5 psi every 3 hours a large leak, it should be easy to find one that size. That being said, I have also had trouble finding large leaks. You might have to remove the insulation from...
  39. Replies
    4
    Views
    850

    What was the actual DSH?

    What was the actual DSH?
  40. I think that a lot of motors that are coming out...

    I think that a lot of motors that are coming out nowadays can't handle speed controls. I replaced a condenser fan motor about a year ago with a OEM from Trane. This unit had a ICM Fan Speed Control...
  41. Replies
    4
    Views
    402

    Well I returned to the job today and the circuit...

    Well I returned to the job today and the circuit held pressure over the weekend. I purchased a 1/2" vacuum hose and another Appion core removal tool. I evacuated for over an hour and got it down to...
  42. Replies
    4
    Views
    402

    I know it could be the hoses, micron gauge or...

    I know it could be the hoses, micron gauge or vacuum pump. I was using 1/4" refrigeration hoses, my company doesn't want to buy vacuum hoses.
  43. Replies
    4
    Views
    402

    Pfannenberg Cabinet Cooler

    Friday I was working on a Pfannenberg Cabinet Cooler. It had a leak around the braze joint on the discharge of the compressor. It is a sealed system with no access valves, so I installed a piercing...
  44. Replies
    13
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    1,147

    It could be the pressure switch not making, did...

    It could be the pressure switch not making, did you check to see if it had voltage to the switch? You said that the induced draft fan was running, it could be an obstruction in the flue if the...
  45. Replies
    6
    Views
    590

    I appreciate your input valdelocc, but I don't...

    I appreciate your input valdelocc, but I don't see any liability by replacing a flame rod with a UV detector. This is a Trane MUA with a Maxon burner and manual that came with the burner states that...
  46. Replies
    6
    Views
    590

    This Maxon burner didn't have a scanner nipple,...

    This Maxon burner didn't have a scanner nipple, it only had threaded holes in the end plate for the pilot, igniter and flame detector. I first installed a flame rod like the original burner had, but...
  47. Replies
    4
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    466

    I left the programming instructions for him to do...

    I left the programming instructions for him to do before he a left and and came the store freezing.


    What?
  48. Replies
    6
    Views
    590

    UV Flame Detector icing up.

    I had a call on a Trane MUA. It is a upflow direct fired unit and I found the UV flame detector had ice on it and the heat block it was screwed onto was plugged with ice. The beginning of this...
  49. Replies
    18
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    1,431

    [QUOTE=ch4man;17485191]it means you must have no...

    [QUOTE=ch4man;17485191]it means you must have no more than 14" wc static (burner off) and more than 5"wc working (burner on) pressure.

    ch4man, that's a good explanation of the inlet rating. It is...
  50. Replies
    18
    Views
    1,431

    Adjusting gas regulators

    I was just wondering how other Techs adjust the pressure on gas regulators, do you do it with the burner on or off? Say a unit calls for a inlet gas pressure of 5" to 14" w.c., does that mean with...
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