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  1. No. Heat energy travels from hot to cold. The...

    No.
    Heat energy travels from hot to cold. The air surrounding the hotter condenser is colder than the condenser. Typically, more so at night. So heat transfer is greater at night. Humidity in the...
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    Gotcha. I see that all three of your ships, and...

    Gotcha.
    I see that all three of your ships, and my one, are all decommissioned. My was scrapped about 1999, in Bremerton. I read that the Ranger and Constellation are in Brownsville, waiting to be...
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    I wonder if we were ever in the same Carrier Task...

    I wonder if we were ever in the same Carrier Task Force. I was on the USS Mississippi (CGN40) which sailed with the Nimitz on two Med. cruises (1981-2 and 1982-3), until it left the Atlantic for the...
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    Had a coworker find debris in the bottom of a new...

    Had a coworker find debris in the bottom of a new drum of low pressure refrigerant (R11, I think).

    Had another coworker find water in a nitrogen cylinder.

    You can't trust anybody or anything,...
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    JWPATE, sorry to hijack, but as an ex-Navy guy, I...

    JWPATE, sorry to hijack, but as an ex-Navy guy, I have to ask - what's up with your avatar? :grin2:
  6. This thread is in its 18th day! OP, unless...

    This thread is in its 18th day!
    OP, unless you're satisfied with playing with graphs, and discussing them, it is way past time to call in another technician. Not a controls tech, an equipment tech....
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    I've seen a leaking sensor cable, too. It was a...

    I've seen a leaking sensor cable, too. It was a puzzler for me, too...
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    Are you asking why didn't he hear it two years...

    Are you asking why didn't he hear it two years ago? Probably because it wasn't slugging two years ago. A lot can happen in two years.
  9. Once air is the system, it will often get moved...

    Once air is the system, it will often get moved around, and you can spend a lot time bleeding air from multiple points. I like to avoid that if possible.
  10. You're right, it is different. It's not so much...

    You're right, it is different. It's not so much that I disagree, I just like to avoid having any part of the system ever see a vacuum. While idle or running. I'd much rather find out there is a leak...
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    On that cool day (50F) it was at the very low end...

    On that cool day (50F) it was at the very low end of acceptable subcooling. Could be slightly low on charge. Since fan control is based on saturated temps converted to pressure, maybe fan control is...
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    Thanks Nyrb. You too, Under Pressure.

    Thanks Nyrb.
    You too, Under Pressure.
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    Got it. So apparently there is another oil...

    Got it. So apparently there is another oil pump/motor/pressure input that is checked prior to what I mentioned in the start sequence. Would the oil pump motor contactor dropping out during normal...
  14. Also, what I like to do, is with the system...

    Also, what I like to do, is with the system on-line and the pump running, check that the highest point and the pump suction are at 10 psig. So that in case of a leak, water comes out and no air goes...
  15. Good job spotting the tree in the forest,...

    Good job spotting the tree in the forest, Buttwheat!
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    The electrical diagram appears (to me, anyway) to...

    The electrical diagram appears (to me, anyway) to show a NO auxiliary contact on the oil pump motor contactor in series with the compressor discharge pressure switch. Those two items appear to...
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    X2!

    X2!
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    This was in response to the other chiller...

    This was in response to the other chiller mentioned in post #15.
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    Well, that little tidbit would have been...

    Well, that little tidbit would have been helpful... :grin2:

    Unfortunately, it's not unusual for seemingly useless info to actually be very useful, and therefore be left out. Live and learn. No...
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    I'm afraid I don't anybody else over in Georgia....

    I'm afraid I don't anybody else over in Georgia. Except maybe one. I think he relocated to Atlanta after the merger. S.I.? In management, I think.
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    JK, Under Pressure has just given a big clue with...

    JK, Under Pressure has just given a big clue with those page numbers. Try not to miss it. But then, you've already missed another big one. Twice! I think you'll soon see what Under Pressure meant...
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    I would send more business to that supplier! ...

    I would send more business to that supplier!

    Good job Royal. :cheers:
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    I would be surprised to see any conversation on...

    I would be surprised to see any conversation on return or replacement get beyond the fact it was installed before it was inspected. There's a reason a signature is required to accept delivery.
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    Ha ha! Funny story: I was thinking of asking...

    Ha ha! Funny story: I was thinking of asking where in Georgia that is, so I could maybe e-mail my former service manager from my previous job and ask if he might have somebody on staff who may...
  25. The best way to compare the two locations is with...

    The best way to compare the two locations is with one instrument. Your way, you are using two instruments: each locations thermostat.
    I would be suspect of your primary home's thermostat readings....
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    Yeah, thanks, Ammoniadog.

    Yeah, thanks, Ammoniadog.
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    I don't want to be around when you pull out the...

    I don't want to be around when you pull out the ol' Buick.... :whistle:
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    If you're asking me, I don't know. But Ammoniadog...

    If you're asking me, I don't know. But Ammoniadog seems to. It supports my anecdotal evidence, too.

    Also, I think a pager is passive. It doesn't seem to be actively looking for a connection like...
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    I carry both, and I have seen the pager receive a...

    I carry both, and I have seen the pager receive a call while I'm in a basement, and then while I'm walking to the building in alarm, I receive a text alert on my phone. Both generated by the same...
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    We still use pagers. At our facility there are...

    We still use pagers. At our facility there are places where there is no cell reception. But the pager will receive a page in those places. Basements and sub-basements. Also, when away from work there...
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    Awesome! Thanks for sharing David. A full view...

    Awesome! Thanks for sharing David.

    A full view of that startup log would be nice... :whistle:

    David, do you know where that startup tech is now? Still working, retired,...?
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    I think it predates Trane's use of CVHA/B/E/F/S...

    I think it predates Trane's use of CVHA/B/E/F/S model numbers. I'm thinking it's a CTV.
  33. If I was forced to work under those conditions, I...

    If I was forced to work under those conditions, I would consider using evacuated nitrogen cylinders.
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    Probably to prevent migration to the evaporator...

    Probably to prevent migration to the evaporator while shut down. To minimize the possibility of compressor slugging on startup.
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    Excellent advice! If I was the OP, this would...

    Excellent advice!

    If I was the OP, this would be at the top of my to do list.
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    I'm speculating the CRACs are cooled by the...

    I'm speculating the CRACs are cooled by the cooling tower, which also cools a water-cooled chiller. And in the winter the chiller is off-line and a plate and frame heat exchanger is used to maintain...
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    If it's a larger RTU, it may have variable air...

    If it's a larger RTU, it may have variable air flow. Meaning it will vary the amount of air with either a speed drive on the blower, or a mechanical inlet damper. In which case it won't have a relief...
  38. I'm a commercial guy, and deal with this only on...

    I'm a commercial guy, and deal with this only on my own house, but what do you guys think of the 1" fiberglass filter at Home Depot and Lowe's? The only ones I see have a flimsy looking cardboard...
  39. You or your landlord should have a tech, who is...

    You or your landlord should have a tech, who is familiar with this specific model equipment, look at it.

    You were probably lucky to be able to operate at these conditions in the past. When the...
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    I have seen a site where one constant volume unit...

    I have seen a site where one constant volume unit and one VAV unit were shipped there, and then installed in the wrong locations (swapped). They were large units and it was cheaper to change out the...
  41. You're welcome! :cheers:

    You're welcome! :cheers:
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    They simply said "no", with no explanation? Nice....

    They simply said "no", with no explanation? Nice.

    I'm not familiar with CRAC's (no smart remarks, please..), but I would look into a head pressure control valve (modulates the water flow thru the...
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    Perhaps the tower water is that cold in winter...

    Perhaps the tower water is that cold in winter because there is a plate and frame heat exchanger for cold weather use? If so, somebody missed the CRAC units while designing the system.
    Can't a water...
  44. Has this unit performed well in past summers?

    Has this unit performed well in past summers?
  45. The red plastic device is an "Outside Air...

    The red plastic device is an "Outside Air Pressure Sensor". It is used on units with the capability of controlling building static pressure. It enables the unit to compare building static pressure to...
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    The "C25" means 25 tons.

    The "C25" means 25 tons.
  47. Is the valve body installed in the correct...

    Is the valve body installed in the correct direction? I can't recall what side that equalizing port is vented to, but it does matter.
  48. In the first pic, the one on the left appears to...

    In the first pic, the one on the left appears to be larger. It has a larger diameter. Both the green part and the metal part. Is that the case, or is it an illusion? Maybe the left one is nearer to...
  49. No DIY. OP appears offended by the best advice...

    No DIY.

    OP appears offended by the best advice given...
  50. Are you replacing the entire valve, or rebuilding...

    Are you replacing the entire valve, or rebuilding the existing valve with parts from the new valve? Could be a mismatch due to small design change.
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