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  1. It's a wine chiller room, so I'd say the client...

    It's a wine chiller room, so I'd say the client wants the temp around 55*.

    The unit uses R22. I'll convert what you said about the pressures, temperatures, and cut in/cut out settings to match...
  2. Thanks Mike19, Yes the condenser unit has a...

    Thanks Mike19,

    Yes the condenser unit has a receiver.

    Can you recommend a specific type of pressure switch. What would the cut-in cut-out settings be?
  3. need help with piping schematic for wine chiller

    Hey guys,

    I need some help with a small wine room, air cooled refrigeration unit that my company is installing.

    I have a Copeland condensing unit M# MCFH-0056-1AA-201

    I have an Air Handling...
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    I know. I was expecting a little ball of solder....

    I know. I was expecting a little ball of solder. Finding a rock in there speaks volumes about the lack of talent in our instal dept. I now send picture to my boss on a daily basis. This was a...
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    1,238

    I'm surprised this sparked a debate on TXV...

    I'm surprised this sparked a debate on TXV sizing. I've always thought the TXV or piston is sized to the condensor.

    The thing that has me confused is the high suction pressure at around 160#
    ...
  6. Replies
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    1,238

    5 ton AH with 2-1/2 ton HP

    Hi brothers,

    My company installed a Goodman 5ton AH with a 2-1/2 ton heat pump. Hey mistakes happen, right?

    Anyway, I get there and suction pressure is low and SH is high.

    I open up piston...
  7. I added the TEL up. I looked up the fittings in...

    I added the TEL up. I looked up the fittings in an ACCA friction rate book. It looks like the square duct with start collars is about twice as restrictive than the TY's.
  8. What design is less restrictive air flow?

    Hey guys,

    I have a question regarding duct design and lay out.

    Picture a rather large diameter flex (16" or 18") running from a plenum to a square to round fitting that's connected to a...
  9. Replies
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    685

    I checked return temp at unit. (Thru small hole in the side discharge duct panel)

    I checked return air temperature at the unit. With just the blower running it was 64*. When I turned on the compressor, the return temp quickly raised to 74* within about 10 min of run time. The head...
  10. Replies
    9
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    685

    RTU heat pump tripping on high limit

    Hi guys,
    I'm working on a Ruud/Rheem 5ton RTU heat pump that keeps locking out on a high pressure limit in heat mode. The unit is 2 years old and went through last winter no problem.
    Indoor coil is...
  11. Replies
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    1,806

    So what happens when the ptrap dries out over the...

    So what happens when the ptrap dries out over the summer?

    I've installed a bunch of Carrier condensing furnaces and never had to prime them.
  12. Replies
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    1,806

    Ok. I think I may have figured this out. I...

    Ok. I think I may have figured this out.

    I went to another new install and had the same problem.

    I'm pretty sure it's the ptrap on the furnace, that's has no water in it (unprimed), creating...
  13. Replies
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    1,806

    That's right gravity. I removed all external...

    That's right gravity. I removed all external field installed flue piping and it wouldn't fire off, until I removed the chamber cover.

    The installers had the flue piping (terminating to a...
  14. Replies
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    1,806

    Sequence gets hung up after gas valve opens-no...

    Sequence gets hung up after gas valve opens-no flame-lock out.

    If it was draft pressure switch, it would lock out earlier in the sequence.

    With the pressure switch open, it wouldn't proceed to...
  15. Replies
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    1,806

    Condensing furnace not firing off

    Need some help on this one guys.
    Brand new Trane/Am.Standard TDC120 condensing furnace not firing.
    It ran through the sequence; inducer-HSI-gas valve opens-no flame-shut down.
    I've got 24 v...
  16. Replies
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    514

    If you really want to know how restrictive to air...

    If you really want to know how restrictive to air flow they are, check static pressure going into the box and then coming out. The difference would be the pressure drop. Flex duct systems are...
  17. Replies
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    Sorry guys about not responding. The issue is...

    Sorry guys about not responding.

    The issue is there is a back family room under a flat roof. I have to run ducts across the roof to get supply registers in there.
    The existing duct work that come...
  18. Replies
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    Using both duct openings on RTU

    Hey guys,

    I'm designing a duct system for an RTU. I need to utilize the side openings on the unit, in order to run ducts across the roof. Currently, the duct work come off the bottom of the unit,...
  19. Yes. 55 psi at suction access port. Runs good...

    Yes. 55 psi at suction access port. Runs good during the day. ( or both times I was checking it) problems occur at nite, when temp drops.
  20. Didn't check that. I had my hands full working on...

    Didn't check that. I had my hands full working on other system at the time. Amp draw would be high on a comp that was eventually going to open on overload?
  21. [QUOTE=Brent Ridley;14865541]Give us a little...

    [QUOTE=Brent Ridley;14865541]Give us a little more info. You say pressure were good - What were your pressures? R22 or 410? Split or package? Outdoor temp? indoor temp? What's the model and serial? ...
  22. Compressor thermal overload open in heat mode

    Hey guys,
    Hoping you could steer me in the right direction. I'm working on a heat pump in heat mode. Pressures are good while I'm there. Indoor coil clean, blower good. Issue is compressor is...
  23. Replies
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    Crane doesn't reach.

    My company is bidding on a big apartment complex job-replacing about 180 gas pack RTU's. Problem is the crane will not be able to access about 1/3 of them. Which means we would have to wheel them on...
  24. Replies
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    1,182

    New Goodman, bad compressor

    Changing out a bad compressor today on a Goodman 410 split system. Low side running at around 150psi / 50 sat temp with about 8 superheated. High side 425psi/130 sat temp with 10 subcooling. Brand...
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    Thanks guys, Interview went well. Took small...

    Thanks guys,

    Interview went well.
    Took small written refridge test that was about basic stuff, then took a "let's see if your a serial killer" computer test. I had to "agree" with the last...
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