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  1. Replies
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    It seems that one possibility for trip is using...

    It seems that one possibility for trip is using the flow switch to enable / disable the chiller. I would think that you would be getting low evap flow trips, but, there is about a 3 second delay on...
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    McQuay low water CO

    I suspect a couple of possibilities here. You didn't mention flow trips, so, the flow protect device is not indicating major flow drop.( or its not functioning ) Is the chilled water loop fairly...
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    3,134

    Asilva..... I think you have gotten your moneys...

    Asilva..... I think you have gotten your moneys worth in advice with your question. To begin with, you are in a great field, that if it suits you will bring you a lot of personal satisfaction, and...
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    1,195

    Thanks for the response Clyde...... I didn't...

    Thanks for the response Clyde...... I didn't expect many replies, since this is a unique animal to say the least. Only a few installations in the country that I could determine. The concept is...
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    1,710

    Cool Perfect had a good idea.... it is similar to...

    Cool Perfect had a good idea.... it is similar to an oil failure switch, but only one capillary input from suction pressure.
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    1,779

    Two things come to mind...... since you say it...

    Two things come to mind...... since you say it happens in the morning, and if it is on pump down, I suspect that the unit may be on a time clock, and LL solenoid leaks through in the off cycle. At...
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    I am assuming the evap is DX. Back in the old...

    I am assuming the evap is DX. Back in the old days, a bulb was strapped to the outlet of the expansion valve set at around 28 degrees as I recall. That seemed to work fairly well, even with a slow...
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    Has anyone in the forum been involved in the...

    Has anyone in the forum been involved in the operation, or maintenance / service of ADsorption chillers? ( as opposed to ABsorption chillers ) I am interested in how well they performed, and any...
  9. Replies
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    2,847

    Since you say you have an oil differential...

    Since you say you have an oil differential switch, you do have a 100 series Microtech controller. On that one, you may be dropping out the oil pump contactor due to a flaky oil pump overload control...
  10. Replies
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    1,501

    If this is a standard application, say 54 / 44 on...

    If this is a standard application, say 54 / 44 on evap, and 85 / 95 on condenser, 2 degree or less approach temps are typical. Evap runs at 37-38 psi at design leaving, and condenser runs around...
  11. Replies
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    2,881

    I have a question, and some suggestions..... is...

    I have a question, and some suggestions..... is the starter fused? Or, fuses in distribution panel? If fused remotely, I might suspect L1 and L2 get together on occasion. It is also possible that...
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    2,585

    I hate to say I can't remember if this model was...

    I hate to say I can't remember if this model was made in a HI/RE/LI or not. If it has an expansion valve indoors and out, it is a conventional heat pump. If it only has one valve in the system...
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    I take it there is a good chance this is a scroll...

    I take it there is a good chance this is a scroll compressor. If the resolution of your ohm meter is not very discrete, the difference in 4 to 5 ohms may not be telling you very much. The possible...
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    2,585

    I work for a group that used to be Westinghouse...

    I work for a group that used to be Westinghouse Air Conditioning. When I go in tomorrow I'll check in the old manuals to see if I can dig up info for you. There is a good chance I have it.
  15. Better late than never, motor was wired properly....

    Better late than never, motor was wired properly. Noted that volts output to motor lagged the frequency output. Changed the output to "linear" in the drive, and, was able to ramp motor up to 55 hz...
  16. Thanks for the replies guys! The motor wiring...

    Thanks for the replies guys! The motor wiring was "checked out", but, I have suspicions about how closely. I will find out tomorrow and post results.
  17. That was a question to be answered on the job...

    That was a question to be answered on the job site visit. I am wondering if the problem may be that this dual voltage motor may be wired for 460 with an applied of 230.
  18. I don't get to deal with many air side problems,...

    I don't get to deal with many air side problems, but, I bet a lot of you do. I haven't been to the site yet, but, here is the info I have... AHU motor running FLA at 40 hz. CFM, motor, and fan RPM...
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    I suggest 2 items, 1, get a phase sequence...

    I suggest 2 items, 1, get a phase sequence indicator ( tool ) to verify the phase sequence at start up. 2, I like the ICM 450 phase monitor which is programmable, and can be applied on 208 or 460...
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    Thats probably a Model IK180. 15 ton RTU. Just...

    Thats probably a Model IK180. 15 ton RTU. Just guessing, its 25-30 years old. If you really need the maufacture date, I should have some old literature at work to decipher the serial number.
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    I would first re-tap to the 208 volt tap to get...

    I would first re-tap to the 208 volt tap to get back closer to 24v. Is the transformer in the condensing unit? If so, does the 24 volt wiring go 1/2 a mile on small gauge wire then back to the...
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    1,874

    I do have two files on CD that I think will help...

    I do have two files on CD that I think will help you, although I don't have an 090' listed in them. Is the Trane unit 90 tons? Or 7 1/2 tons? Either way I'm sure the files will help you out. How...
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    1,874

    I assume its an S"T"090 unit, rather than S1090. ...

    I assume its an S"T"090 unit, rather than S1090. That would be a 7 1/2 ton condensing unit with can compressor. Seems that I recall the compressors had unloading capability. It is possible I can...
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    Hey SalesSlime, I believe this is confusing due...

    Hey SalesSlime, I believe this is confusing due to the statement..... bad volts ratio is the one you're thinking about. I'm pretty sure the statement is an earlier version of phase/volts
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    Temporarily jumper the phase monitor control...

    Temporarily jumper the phase monitor control circuit and see if you can clear the alarm. If it does, check setting on the monitor to verify that it agrees with the actual voltage. If you still have...
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