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Type: Posts; User: coolairman

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  1. Replies
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    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...
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    2,106

    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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    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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    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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    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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    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...
  10. 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
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    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...
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    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
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    Stupid costs extra

    Stupid costs extra
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    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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    2,176

    They are just trying to discourage the copper...

    They are just trying to discourage the copper thieves.
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    4,438

    Where is the cleanout?

    Where is the cleanout?
  17. Thread: High head

    by coolairman
    Replies
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    1,750

    Rheem units typically have a manual reset high...

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

    by coolairman
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    2,425

    Just because you can doesn't mean you should.

    Just because you can doesn't mean you should.
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    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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    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...
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    1,846

    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
  22. Thread: gasleak

    by coolairman
    Replies
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    3,206

    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
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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
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    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...
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    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
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