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Type: Posts; User: coolairman

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  1. Replies
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    Josh.: If you havn't found your UCPM software...

    Josh.:
    If you havn't found your UCPM software yet give Rich Hayner a call in the TCS Charleston office.
    Regards
    Coolairman
  2. Replies
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    459

    AAON problem

    We have an AAON split system heat pump air handler model # M1H011R2AA0A0:FTE101PA00000000
    s/n 200404-CFDC0007 230 v 3 ph with 5 hp exhaust and 7.5 hp supply fan with heat recovery wheel and hot gas...
  3. Replies
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    3,096

    You may have some extra refrigerant stacked in...

    You may have some extra refrigerant stacked in your system, like Sicofthis said 24 degrees is a lot. If your fans, P66 control all checks out and your coil is clean, I would recover some of the...
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    Thanks Balibe, I'll try that on the next one.

    Thanks Balibe, I'll try that on the next one.
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    955

    These are on VAV boxes. It is set up on an Ivu...

    These are on VAV boxes. It is set up on an Ivu with bridges. When one of these fails, I have had 4 in the last 2 years or so, most or all of the controllers on that floor will not communicate, until...
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    Carrier 33ZCFANTRM

    We are servicing a building with a hundred or so of these controllers. Every so often one will fail and crash the bus, and lose comm for the whole floor. Is there anything we can do besides replacing...
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    1,293

    A little more information on the application...

    A little more information on the application would be helpful, but on a comfort cooling application you can introduce the hot gas just downstream of the expansion valve, before the distribution...
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    If you just in your first year. you should have a...

    If you just in your first year. you should have a mentor, with more experience, that you can talk over decisions with so you can benefit from their experience. Experience ia another name for...
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    966

    Need help with Liebert humidifier

    Does anyone have a wiring connection drawing for the infrared humidifier for an old Liebert FH199-A01. I have one with a dead short in the lamp circuit and the wiring has been changed from the...
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    473

    YPAL problem

    I have a YPAL050CVC46BBCX. It has a tranducer package on 1 circuit only. The problem I'm seeing is the alarm led is lit and the pressures on the display are ???. Checked the transducers and got 3.5...
  11. Check the contactor, if the contacts are bad you...

    Check the contactor, if the contacts are bad you can get a current imbalance between phases in the compressor motor-causing overheating.
    Coolairman
  12. Replies
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    1,508

    Sounds like a classic restriction to me. You are...

    Sounds like a classic restriction to me. You are no doubt aware the metering device is in the ODU. When you pull the refrigerant out, you can put your pressure taps any where you want them.
    Good...
  13. Replies
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    8,456

    Sounds to me like the bearings are worn, main and...

    Sounds to me like the bearings are worn, main and or rod bearings. The excess clearance between the crankshaft and bearings wont allow oil pressure to stay up.

    Coolairman
  14. Replies
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    2,998

    Stupid costs extra

    Stupid costs extra
  15. Replies
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    1,187

    I assume you are changing the outdoor unit to a 2...

    I assume you are changing the outdoor unit to a 2 compressor setup where you will be running at approx. 50% capacity most of the time. I would get the information off the valve and check it out with...
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    2,383

    They are just trying to discourage the copper...

    They are just trying to discourage the copper thieves.
  17. Replies
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    4,965

    Where is the cleanout?

    Where is the cleanout?
  18. Thread: High head

    by coolairman
    Replies
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    1,869

    Rheem units typically have a manual reset high...

    Rheem units typically have a manual reset high pressure safety-must have been bypassed.?
  19. Thread: Easy access

    by coolairman
    Replies
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    2,890

    Just because you can doesn't mean you should.

    Just because you can doesn't mean you should.
  20. Replies
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    2,351

    Coolairman

    Contactor coils typically burn up from a chattering condition, caused by lower than normal control voltage from having the wrong primary tap or a high resisistance short in the control wiring-not bad...
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    1,208

    Coolairman

    You didn't mention if anyone worked on it before you got there.
    It sounds like you have a restriction in the filter drier or metering device.
    Sometimes inexperienced "techs" will add refrigerant...
  22. Replies
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    2,363

    Dont forget to check the hot gas bypass valve. If...

    Dont forget to check the hot gas bypass valve. If it is adjusted wrong your superheat will be high and your capacity will be reduced.

    Coolairman
  23. Thread: gasleak

    by coolairman
    Replies
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    3,329

    Dutch you work on some really cool hardware. I...

    Dutch you work on some really cool hardware.

    I have worked on a couple of Kraus chillers, very high quality.

    Regards

    Coolairman
  24. Replies
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    Doug is right. I did the same thing in one of...

    Doug is right.

    I did the same thing in one of my buildings.

    I'm hoping the new tax incentive will push the building owner to purchas a new control system.

    Coolairman
  25. Replies
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    1,585

    Nisong: Sometimes if you are running an air...

    Nisong:

    Sometimes if you are running an air cooled package chiller, or any refrigeration system really, in ambient conditions below 20 F and the capillary tube on the low pressure safety switch is...
  26. Replies
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    1,808

    I didn't see any mention of worn or pitted...

    I didn't see any mention of worn or pitted contacts on contactor or starter.

    my 2cents.

    Coolairman
  27. Replies
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    1,892

    What I do when I suspect a scroll is running...

    What I do when I suspect a scroll is running backwards is check the current. It will be about 1/3 of rated load current while running backward.

    Coolairman
  28. Replies
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    852

    The r terminals on your sub base are for the line...

    The r terminals on your sub base are for the line side of your transformer's secondary. The rc terminal is for your cooling transformer and the rh term is for heat. These are seperated electrically...
  29. Thread: DASHPOT

    by coolairman
    Replies
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    1,328

    Many years ago, when I was an apprentice, some of...

    Many years ago, when I was an apprentice, some of the compressors 30 to 80 ton recips that I ran into had autotransformer or part winding start, starter gear on them.
    The dashpot acted as a time...
  30. Replies
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    684

    Put in a tee at the bottom of the riser with a...

    Put in a tee at the bottom of the riser with a threaded plug so debris can be cleaned out of the trap assy.

    Coolairman
  31. Replies
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    There are a lot of good suggestions above....

    There are a lot of good suggestions above.
    Please allow me to add my 2 cents woth.

    As a long time hvac service guy I believe in the kiss principle-keep it simple ...

    Have a professional...
  32. Replies
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    1,464

    It's pretty typical for the company to purchase...

    It's pretty typical for the company to purchase the big ticket items and techs to purchase hand tools. Our company replaces worn or broken tools at the discretion of the first line supervisor.
    I add...
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    Dowadudda: Tell your customer that the direct...

    Dowadudda:
    Tell your customer that the direct fired heater is 100% efficient that is, there are no stack losses, every single btu goes into the make-up air stream.
    The only way he can save money...
  34. Replies
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    1,489

    Millerbug 42: With all due respect, you do not...

    Millerbug 42:

    With all due respect, you do not need an oil seperator on an R-22 air conditioning system if iit is piped correctly, i.e. proper sizing, oil traps at bottom of risers, dual risers...
  35. Replies
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    1,489

    Joe: When you change from a water cooled...

    Joe:

    When you change from a water cooled condenser you have to be very careful about line sizing. It sounds like the condenser is above the compressor. All compressors pump some oil so you have to...
  36. Thread: UV lights

    by coolairman
    Replies
    7
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    996

    Be careful if there is a plastic condensate drain...

    Be careful if there is a plastic condensate drain pan, the UV will behave just like sunlight and make the plastic brittle.

    Coolairman
  37. Replies
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    Gentlemen: You may find this website...

    Gentlemen:
    You may find this website useful-www.climatequest.com.

    They list degree day information, economizer hours info and lots of other good data pertinant to economizer usage.

    Regards
    ...
  38. Replies
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    If you are freezing a coil on a direct expansion...

    If you are freezing a coil on a direct expansion air conditioning system, the more likely culprit is a lack of air flow.
    When there is not enough volume (cfm) across the evaporator coil there is...
  39. From a service and maintenance point of view it...

    From a service and maintenance point of view it is always better to install your equipment on the roof.
    When equipment is installed where it is difficult to get to i.e. above a suspended ceiling,...
  40. Thread: Dunham-Bush

    by coolairman
    Replies
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    6,988

    Back in the early 70's I took care of a building...

    Back in the early 70's I took care of a building with a 15 ton Dunham Bush air cooled chiller. Had compressor failures each spring. Found out the dumbass installers put the receiver in backwards with...
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    1,338

    I purchase tinted safety glasses from the local...

    I purchase tinted safety glasses from the local welding supplier. They look just like sunglasses. They are good for soldering or silver brazing in close quarters. You can even use them for driving.
    ...
  42. Replies
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    1,396

    Lennox has always claimed to be cheaper by the...

    Lennox has always claimed to be cheaper by the pound.
  43. Replies
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    2,863

    Mike4hvac: It's difficult to know from the...

    Mike4hvac:

    It's difficult to know from the information you provided, but I would look at the mixed air control. It could be this is defective and telling the economizer control the mixed air temp...
  44. Replies
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    3,524

    A couple of years ago I had a ten ton split...

    A couple of years ago I had a ten ton split system Carrier heat pump that would lock out intermittantly. I went through all the drills to find out which switch was opening and when. What we...
  45. Replies
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    3,524

    Plain spoken is right on the money. ...

    Plain spoken is right on the money.

    Aprophet-the tattle tale will work if you jumper the normally closed contact on the CLO or bypass it altogether. Your safeties will still work it just won't...
  46. Replies
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    3,524

    The last time I checked, we get paid to diagnose,...

    The last time I checked, we get paid to diagnose, and replace if defective, (rare but it does happen) the compressor lockout i.e. CLO controls. They are there to protect the compressor. It would be...
  47. Replies
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    3,524

    If you use a freeze-stat to shut the compressor...

    If you use a freeze-stat to shut the compressor down when the low side ices, be sure it is put on the common side of the compressor contactor. If you put it in series with the other safties the CLO...
  48. Replies
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    3,524

    Absorbertek is correct. If you are running in the...

    Absorbertek is correct. If you are running in the cooling mode with outdoor ambient temps below 60 degrees, the system needs help to keep the condensing temp up to prevent coil freezing, liquid...
  49. Replies
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    2,081

    That's what I would do if I lived in a cold...

    That's what I would do if I lived in a cold climate which thankfully I don't anymore.

    Coolairman
  50. Replies
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    3,524

    The clo on Carrier units will lock out if any of...

    The clo on Carrier units will lock out if any of the safties open while the compressor is running. The inductive loop on the clo tells the electronic logic the comressor is running.
    One of your...
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