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  1. The noise could be coming from the auger scraping...

    The noise could be coming from the auger scraping against scale build up in the evaporator or scraping against the evaporator itself if the upper and/or lower bearings are bad. You can remove the top...
  2. Replies
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    I second this. It doesn't take much to overcharge...

    I second this. It doesn't take much to overcharge microchannel coils. Another thing to check would be non-condensables


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  3. Replies
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    694

    Is there an OA cooling lockout or changeover...

    Is there an OA cooling lockout or changeover setpoint? Another thing to check is if the OA dampers are 100% because the unit is trying to make the static setpoint. If so, make sure the static...
  4. There are certain values that Alerton uses in...

    There are certain values that Alerton uses in their programming designated for microsets. If you're able to access the front end you shouldn't need the service tool. Look at all the device's values...
  5. I usually do it in the return/mixed air section...

    I usually do it in the return/mixed air section up at the unit, but I've done measured in the space as well. Depending on the type of return, I wouldn't think there would be much of a difference but...
  6. Good to know, thank you! Sent from my iPad...

    Good to know, thank you!


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  7. If you can even get them to sell it to you, the...

    If you can even get them to sell it to you, the dumbed down version of Rover is expensive (water, test and balance kit) and the full version is ridiculous IMO. Correct me if I'm wrong, but I thought...
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    I've ran into a similar Aaon setup but instead of...

    I've ran into a similar Aaon setup but instead of supplying to a space, it's only purpose was to supply fresh air into all of the RTU's returns because none of them had economizers. In your setup I...
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    2,938

    Unfortunately not all handhelds work with all...

    Unfortunately not all handhelds work with all Aaons. I think they need the right software version or something like that depending on what unit you're trying to connect to


    Sent from my iPad...
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    2,938

    You'll have to get ahold of a wattmaster handheld...

    You'll have to get ahold of a wattmaster handheld and punch in the address of the dip switches on the wattmaster board. It's more than likely using the space sensor for control but you can change it...
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    2,520

    You have to take what you can get and if you...

    You have to take what you can get and if you really want, apply a general rule of thumb for pressure drop through the condenser. Otherwise it'll get you close enough. You can also usually get close...
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    Thank you for the response! Until I smell it...

    Thank you for the response! Until I smell it myself and find the source I'm not sure what to think. This was just the closest thing I could find from what the customer was describing


    Sent from...
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    1,027

    I added water to the floor drains in both...

    I added water to the floor drains in both bathrooms and the janitor's closet today as well. Now we play the waiting game


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    Yes Sent from my iPad using Tapatalk

    Yes


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  15. Replies
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    Alright so the smell wasn't present today since...

    Alright so the smell wasn't present today since it comes and goes randomly. I checked everything to do with the condensate, inspected the duct insulation, unit components and outside air intakes but...
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    1,027

    I read that it's mostly found in residential heat...

    I read that it's mostly found in residential heat pumps that were in high humidity southern states, but were starting to see it commercially as well. Preclude is a very strong word my friend!! I'll...
  17. Replies
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    1,027

    "Dirty Sock Syndrome"

    Tomorrow, I'm going to one of my commercial accounts (in a mall) for complaints of a gym smell coming from a particular unit. It's a larger Trane split system with a DX coil and economizer. It also...
  18. Thread: economizers

    by reeferrat
    Replies
    18
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    2,021

    Interesting... so it was a proportional...

    Interesting... so it was a proportional controller modulating the damper motor with resistance? Were there separate sensing bulb type stats controlling changeover and low ambient lockout?


    Sent...
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    Besides water treatment; regularly spray the...

    Besides water treatment; regularly spray the media and louvers, clean the nozzles and nozzle plates, remove the sediment from the basin and clean the pump strainers


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  20. Thread: economizers

    by reeferrat
    Replies
    18
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    2,021

    I've actually only ran into a handful that had...

    I've actually only ran into a handful that had the bypass plug in, but at new buildings and accounts I'd say over 50% of them don't work. Mainly because the dry bulb / enthalpy sensors are cheap,...
  21. Thread: vfd drive

    by reeferrat
    Replies
    4
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    785

    As bill said, you have to be more specific to get...

    As bill said, you have to be more specific to get any help. I'm assuming that you think there's voltage issues because the drive is faulting on a voltage fault?


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    Recently had a newer Trane that would do...

    Recently had a newer Trane that would do something similar. As soon as the gas valve was energized, the current drawn by the valve would cause the board to think there was a flame failure if I...
  23. Replies
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    510

    Carrier Zone Controller TSTAT

    Is it a ZS plus sensor? I think the heating and cooling setpoint adjust values (rNet #'s 400 + 401) determine how much you're able to adjust the actual setpoints (rNet #'s 402 + 403) using the slider...
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    I would check the return grates to see if they're...

    I would check the return grates to see if they're dirty or plugged, the RA damper to make sure it's working and traveling properly, and your supply duct to make sure nothing is restricting airflow
    ...
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    Does it happen shortly after the compressor...

    Does it happen shortly after the compressor starts or after it's running a while?


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  26. Replies
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    This was new to me as well at a golf course that...

    This was new to me as well at a golf course that I take care of. They have hydrogen detectors controlling exhaust fans in the garage where they store and charge the golf carts. I'm not sure what the...
  27. Replies
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    If the manifold pressure and gas valve (opening...

    If the manifold pressure and gas valve (opening too slow or excess gas pressure on initial opening) checks out tomorrow and the burners are truly aligned with the HX then it's a draft or HX issue. It...
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    Does it seem like there's a delay on ignition and...

    Does it seem like there's a delay on ignition and does the rollout occur on ignition? Or is it just during the cycle from that one burner?


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  29. Replies
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    1,798

    Is it just the angle of the picture or is that...

    Is it just the angle of the picture or is that burner not lit? If it's not lit i would pull + clean the burners and orifices. It looks like either that orifice is plugged or the burners are very...
  30. Replies
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    If you end up changing the resistor let me know...

    If you end up changing the resistor let me know how it goes, I'm curious to see how it turns out


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  31. Replies
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    I'd definitely check the internal contacts on the...

    I'd definitely check the internal contacts on the module before you go down that road. Especially if you've verified that the sensor is reading correctly. Another thing it could be is the changeover...
  32. Replies
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    740

    Are you sure it's an enthalpy sensor problem?...

    Are you sure it's an enthalpy sensor problem? Make sure it's mounted in the airstream and that your OA dampers aren't pinched off. I've had the external contacts in the module get stuck open or...
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    I've had the best luck with gates belts. I'd...

    I've had the best luck with gates belts.

    I'd check the following:
    Motor amp draw
    Alignment
    Play in the motor and/or shaft bearings

    If it's an old unit with new issues, what's changed? ...
  34. Have you seen it lockout? If so is it at the...

    Have you seen it lockout? If so is it at the beginning, during or after the cycle? What type of scanner is it?


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  35. Replies
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    I've only ran into it once. It was a VVT system...

    I've only ran into it once. It was a VVT system with bypass dampers on all of the RTUs that had multiple zones. The system was only a few years old and was a complete nightmare. They are the poor...
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    Parameters 117, 118 + 119 are for CO2. I have yet...

    Parameters 117, 118 + 119 are for CO2. I have yet to see a Lennox unit without power exhaust when their controlling the CO2 levels so that might be a quick indication. Or you can look at the 4th...
  37. Will it not respond to a set point change from...

    Will it not respond to a set point change from the front end or is it an adjustable stat and won't respond to changes on the stat itself? I would go through the micro set parameters and make sure...
  38. Replies
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    You can always isolate the actuator and manually...

    You can always isolate the actuator and manually give it a signal with a signal generator, etc. if you're ever unsure whether the problem lies within the module or the actuator. Hope this helps!

    ...
  39. Replies
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    Here's how I check the black Honeywell modules on...

    Here's how I check the black Honeywell modules on a typical 2 stage carrier RTU. There are minor changes from manufacturer to manufacturer but you can figure that out as you go

    1. Make a Y1 call...
  40. Replies
    3
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    396

    If the unit is specifically designed for it then...

    If the unit is specifically designed for it then it should be represented by one of the values in configuration id 1 or 2. Or you can find what parameter the CO2 set point is and go to it in the...
  41. Replies
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    Does the pumpdown come from the microtech or the...

    Does the pumpdown come from the microtech or the compressor board?
  42. Replies
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    Did anyone take an amp draw of the motors that...

    Did anyone take an amp draw of the motors that were removed? Are the new motors dual voltage or just 208V? Are you reading the amps on the drive or a meter? If you're using one drive for both fans, I...
  43. Replies
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    Check the timing on all of the timers. I can't...

    Check the timing on all of the timers. I can't remember them all but I recall a LP timer, minimum on/off and one for the cooling relay and also the reset cube relays. Make sure the compressor aux...
  44. If the 3 way valve is installed and operating...

    If the 3 way valve is installed and operating properly and the coil isn't plugged or restricted then it sounds like a balancing issue to me
  45. Kind of sounds like a balancing issue to me

    Kind of sounds like a balancing issue to me
  46. Replies
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    847

    Alerton's term for that is negate. You might be...

    Alerton's term for that is negate. You might be able to do so in the AO properties on envision or whatever front end you have. Otherwise it has to be done in the programming on visual
  47. Replies
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    Leave it up to Aaon to be a pain in the ass. I've...

    Leave it up to Aaon to be a pain in the ass. I've came across this scenario on a condensing unit with nuisance high head pressure trips because the CFMs were replaced with non-OEM motors that were...
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    1. Max pressure for the actuator is 25#, 22# is...

    1. Max pressure for the actuator is 25#, 22# is too much. I wouldn't be surprised if it's seen over 25# and messed up the diaphragm, piston or valve

    2. Your thermostat needs to be calibrated
    ...
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