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Type: Posts; User: brent

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    Trane CGAM with pumps

    I have a CGAM with unit mounted dual pump package. It also includes a factory mounted VFD for the pumps. The question I have is related to the control of the VFD. I have a field supplied and...
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    709

    T7350 with motion sensor

    I have a customer that wants a motion sensor to control occupied times in a conference room. It should be no problem since I can use a T7350D which has 2 terminals for a motion sensor. I am having a...
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    That is a problem. In our area technically you...

    That is a problem. In our area technically you are not allowed to run condensate into the sanitary sewer. The sewer dept does not want any water introduced into the sewer system that was not paid...
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    If the contractor isn't really experienced with...

    If the contractor isn't really experienced with geothermal I would stay away from them. Another red flag is them suggesting a separate loop for each unit. I always design my systems with a single...
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    package units will be considerably cheaper than...

    package units will be considerably cheaper than splits. If you can avoid splits especially above 5 tons you will save money.
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    JCI: branch vs distributor

    I am looking to tap some of the knowledge out there. We have a decent size retirement community that has existing Johnson Controls system in some of the buildings. They have three N30's, some...
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    Taco

    We recently changed the impeller in a Taco split case pump (100 hp). It's not the same but very similar. With 2 guys the first one took about 6 hours of working and the second one took about 4 hours.
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    You can design to whatever you want. Out in the...

    You can design to whatever you want. Out in the southwest they can design for 115 outside 75 inside. 20 is just typical, 95 outside 75 inside. You can design for 15 or 10 difference if you...
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    I'm not familar with the Bard units. The FHP...

    I'm not familar with the Bard units. The FHP units I have experience with that had hot gas reheat were water source units. So if you can go geothermal that would be great. Climatemaster also makes...
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    I think permability may be an issue. Typically in...

    I think permability may be an issue. Typically in spaces where you are controlling humidity you want a vapor barrier so you are only dealing with the humidity inside the space. You want the...
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    Typically the humidity setpoint is 50%. It is...

    Typically the humidity setpoint is 50%. It is normally an acceptable design to let the humidity drift up to 60% during heavy use.
    The problem may not be the humidity level but you do not have air...
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    As someone said, having modulating or 2 position...

    As someone said, having modulating or 2 position valves can make a difference in humidity levels. But 3-way or 2-way valves should make no difference at all.

    brent
  13. That is an interesting setup for autofill....

    That is an interesting setup for autofill. Something I have never seen. I would have issues with it if it were my house. First, 60 psi loop pressure seems really high. Typically we would install a...
  14. It's hard to see but I don't think your make up...

    It's hard to see but I don't think your make up water connection is correct. You should have a small expansion tank in the loop somewhere. Do you? I would not recommend an auto fill setup on a closed...
  15. Thread: York BAS

    by brent
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    2,469

    We have an underfloor building with all York...

    We have an underfloor building with all York controls and it has not been a good experience. The thermostats were the biggest piece of junk ever. The thermostats were made by Delta and they have a...
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    We have used Powrmatic units with good success....

    We have used Powrmatic units with good success. They are made in Maryland. I was involved in a building that used an air rotation unit to heat a 3 court tennis building. It worked well especially...
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    I'm not sure what you are asking. Are there...

    I'm not sure what you are asking. Are there existing air rotation units that you are looking to replace? Is this a new building?
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    Do the apartments currently have air...

    Do the apartments currently have air conditioning?
    How many floors do the building(s) have?
    Probably the most practical thing to do is install a gas furnace with AC and run a minimal amount of...
  19. Thread: 2003 Energy code

    by brent
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    581

    Are you interested in residential or commercial?

    Are you interested in residential or commercial?
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    Did you drain the loop before adding the glycol?...

    Did you drain the loop before adding the glycol? If you introduced air to the system your air scoop may continue to remove air for a while. How long have you been losing pressure? 1 week? 3 weeks?
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    I too would be pissed if you turned off the gas....

    I too would be pissed if you turned off the gas. I see no reason for it. Yes, it should be replaced. You said your company is checking in with Trane to see what the current recall status is. What is...
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    It's a good chance that there are auto flow...

    It's a good chance that there are auto flow regulators built into the hose kits. They may be built into the ball valves and not noticable at a glance.
    Post a picture of a typical unit.
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    This type of system is often seen in apartments...

    This type of system is often seen in apartments where the domestic hot water and the space heating load are both low. My cousin lived in an apartment that had this setup. He said if he was in the...
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    Packaged units on the ground outside would be the...

    Packaged units on the ground outside would be the easiest. You can run the duct through the wall and up inside the building or up the outside of the building and through the wall high. The good thing...
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    Buy yourself a refractometer. I think you can get...

    Buy yourself a refractometer. I think you can get one for around $100. You can take a sample and see what your freezepoint currently is. You then can add straight glycol while draining your loop...
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