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  1. Replies
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    Views
    181

    220 lbs of refrigerant for a 5 ton unit sounds...

    220 lbs of refrigerant for a 5 ton unit sounds about right. As long as the line set is 1mile long.
  2. Thread: High pressure

    by hands
    Replies
    29
    Views
    1,036

    Sounds like it has a restriction, did you replace...

    Sounds like it has a restriction, did you replace the filter-driers? Does it have a TXV or is it fixed orfices?
  3. Replies
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    400

    I have seen pillow block bearings that were not...

    I have seen pillow block bearings that were not greased from the factory. You should be able to see if they had grease in them after running for seven months. Have the belts been changed, if so, were...
  4. Replies
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    502

    I know that Trane use to sell screen kits to keep...

    I know that Trane use to sell screen kits to keep the coils clean. They were advertised that when the fans shut down, all of the cottonwood and debris would fall off of the screens.
  5. Replies
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    3,077

    If you want to get technical, then you shouldn't...

    If you want to get technical, then you shouldn't even be around an open control panel. If a contractor pulls in and there is a problem with the motor, it could explode just as if you push it in by...
  6. Replies
    11
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    735

    This unit has the fixed orifices in the liquid...

    This unit has the fixed orifices in the liquid line feeder tubes going into the evaporator coil. You will see this in many RTU's. Trane is known to get restrictions in the orifices, usually a waxy...
  7. You need to have a good load so both compressors...

    You need to have a good load so both compressors are running and disable the HGBP. If there is a liquid receiver, the only way to charge it, without knowing the factory charge, is to go by the sight...
  8. Replies
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    724

    I have seen this on several Trane units. I have...

    I have seen this on several Trane units. I have always brazed over the hole and spread it around the pipe. I have never had a problem with doing this.
  9. Replies
    20
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    708

    The electric heaters should have pressure...

    The electric heaters should have pressure switches to prevent them from energizing if there isn't enough air flow.
  10. Replies
    37
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    1,719

    How does it run with just one of the tandem...

    How does it run with just one of the tandem compressors? What is the sub cooling? Sounds like it could be low on charge, sometimes the manufacturer lists the wrong refrigerant weight. Has this unit...
  11. Replies
    10
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    495

    It's a shame this happened, the unit is only...

    It's a shame this happened, the unit is only about 14 months old. In the Fall, roofers were working and hit the coil with something. They actually reported something spraying out of the unit. I was...
  12. Replies
    10
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    495

    I have considered a take-apart shell, but there...

    I have considered a take-apart shell, but there really isn't a good place to support it where the cores could be replaced. I'm also concerned about the cover leaking with the high pressures of ...
  13. Replies
    10
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    495

    Liquid Line Flare Filters

    I was just wondering how liquid line filter-driers with flare connections hold up with R-410a systems. Do any of you guys use them and if so, do they tend to leak? I will be replacing the condenser...
  14. Replies
    11
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    757

    I work on a few Advantage process chillers. In...

    I work on a few Advantage process chillers. In the last five years that I have been doing the maintenance on them, there has never been a problem or repair needed.
  15. Replies
    20
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    2,316

    A few years ago I found a leak like that on a hot...

    A few years ago I found a leak like that on a hot gas solenoid valve stem. This was on a Koolant Koolers chiller and the solenoid valve cycled a lot. I think the plunger wore out the top of the stem.
  16. Thread: Green POE Oil

    by hands
    Replies
    7
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    845

    I have worked on several Koolant Koolers chillers...

    I have worked on several Koolant Koolers chillers that had Copeland scroll compressors with fluorescent yellow refrigerant oil.
  17. Thread: Travel Pay

    by hands
    Replies
    19
    Views
    1,131

    If I was sent to a job 2 hours away and worked...

    If I was sent to a job 2 hours away and worked there until quitting time, I would be paid straight time for the ride home. If I ran an after hour service call that was 2 hours away, I would be paid...
  18. I don't know if it's code, but I have seen them...

    I don't know if it's code, but I have seen them in many mechanics garages. I have even seen them and wood shops and they were full of wood dust.
  19. If the unit is on the roof, you will need to use...

    If the unit is on the roof, you will need to use a lift or a crane. One guy won't be able to lift it up safely. They are easy to change, but if it was me, I would quote 8 hours for the job. I like to...
  20. Replies
    17
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    977

    X2

    X2
  21. Thread: Liebert Issue

    by hands
    Replies
    8
    Views
    975

    Does it have a P266 Fan Speed Control. If it...

    Does it have a P266 Fan Speed Control. If it does, you may need to set up the parameters for 407c. I have also seen the boards go bad in them and the fan will run full speed all of the time or not at...
  22. Thread: Holiday Pay

    by hands
    Replies
    65
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    4,398

    Going by the union contract, we don't get paid...

    Going by the union contract, we don't get paid holidays. But if you work on a holiday, you get double time. Now the contractor I work for does pay me for holidays, but this is something I have worked...
  23. Thread: Trane Voyager

    by hands
    Replies
    28
    Views
    1,646

    It sounds like an air flow problem or the supply...

    It sounds like an air flow problem or the supply air is being pulled into the return giving you a high return air temperature. I have see this where the supply and return diffusers were high in the...
  24. Thread: Trane Voyager

    by hands
    Replies
    28
    Views
    1,646

    What was the return air temperature? Have you...

    What was the return air temperature? Have you checked the manifold gas pressure to see if the burner is over firing? What is the induction blower?
  25. Thread: Question??

    by hands
    Replies
    24
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    2,079

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

    There's an old saying, A/C work is just sloppy refrigeration work.
  26. Replies
    3
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    846

    One is just as bad as the other.

    One is just as bad as the other.
  27. 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.
  28. Thread: wshp

    by hands
    Replies
    16
    Views
    779

    Whatisthesuperheatandsubcooling?

    Whatisthesuperheatandsubcooling?
  29. 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...
  30. 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...
  31. Replies
    7
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    574

    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?
  32. Replies
    7
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    574

    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...
  33. Replies
    46
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    2,889

    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.
  34. Replies
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    2,354

    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.
  35. Replies
    14
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    905

    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?
  36. Replies
    14
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    905

    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.
  37. Replies
    8
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    692

    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?
  38. Replies
    22
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    1,221

    [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.
  39. Thread: Evap coil repair

    by hands
    Replies
    8
    Views
    636

    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...
  40. Thread: HVAC Consultant

    by hands
    Replies
    4
    Views
    725

    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...
  41. Replies
    19
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    1,448

    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...
  42. Replies
    17
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    1,796

    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...
  43. Replies
    3
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    512

    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,...
  44. Thread: BDP RTU problem

    by hands
    Replies
    5
    Views
    730

    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...
  45. Thread: BDP RTU problem

    by hands
    Replies
    5
    Views
    730

    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...
  46. Thread: BDP RTU problem

    by hands
    Replies
    5
    Views
    730

    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...
  47. 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.
  48. Replies
    2
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    360

    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...
  49. Thread: leak testing ?

    by hands
    Replies
    12
    Views
    777

    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,...
  50. Replies
    8
    Views
    691

    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...
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