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Type: Posts; User: brent

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  1. Replies
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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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    765

    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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    1,072

    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
    Replies
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    2,599

    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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    615

    Are you interested in residential or commercial?

    Are you interested in residential or commercial?
  20. Replies
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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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    I need some help tuning a building pressure loop...

    I need some help tuning a building pressure loop for a Carrier RTU. This is what I have

    Setpoint: 0.08

    Building Pres Master Ref 0.08 in H2O
    Building Pres Subm. Ref 0.00 in H2O

    Economizer...
  27. You said you have a 3 ton AC now. Does that keep...

    You said you have a 3 ton AC now. Does that keep the house cool enough for you in the summer? If it does you need to replace it with a 3 ton unit. You don't want to go bigger. What size is your...
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    Why don't you just install a elec HW heater...

    Why don't you just install a elec HW heater (maybe 80 gal) in line with your current domestic HW heater? The cold water will enter the new elec HW heater first and then to your current dom HW heater....
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    I'm assuming they are closed circuit coolers. Do...

    I'm assuming they are closed circuit coolers. Do you drain the pan water from the middle tower in the winter? I have also always seen 70 loop temp in the winter.
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    I think sl is saying that he has a differential...

    I think sl is saying that he has a differential pressure switch or gauge across the filters. When the pressure drop gets to 0.5 (or whatever) it indicates that the filters are dirty and should be...
  31. Thread: horriblezontal

    by brent
    Replies
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    5,554

    thoglow- If your system is undersized and running...

    thoglow- If your system is undersized and running all day to maintain 78 on hot days you are spending less money then if your unit was half a ton larger. If it was larger it could probably maintain...
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    I am assuming you are saying that you try to use...

    I am assuming you are saying that you try to use the economizer for cooling when you go below 27. That seems a little high. I don't think you will get much cooling at 27. I just set a job at 24. It...
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    We have installed several Powrmatic units. They...

    We have installed several Powrmatic units. They are made in Maryland. They are the only units I have experience with so I can't say how they compare. We have been happy with them.
    Another...
  34. Thread: ventilation

    by brent
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    573

    both Core & vern's response is correct. 0.05 cfm...

    both Core & vern's response is correct. 0.05 cfm per square foot is the amount of outside air that is required by code for the building occupants. You usually can get away with not having a...
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    I just stayed in Duck for a week vacation. I had...

    I just stayed in Duck for a week vacation. I had a great time. I couldn't believe all the million $ homes that were built in the last 5 or so years. Where does all the labor come from to build (or...
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    It sounds like it is right on the money. You...

    It sounds like it is right on the money. You wouldn't want to go to 5 tons because 4 tons meets your needs even on the hottest days.
    You possibly could go to 3.5 tons but the temperature would drift...
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    Do you have high return grilles for your main...

    Do you have high return grilles for your main unit?
    Does the bonus room have a door that you can close or is it open to the rest of the house. I think the hot air is drifting up to the bonus room...
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    Does your main house unit run continuously during...

    Does your main house unit run continuously during hot weather? Do you have high return grilles for your main unit? Maybe if your main unit could draw some more hot air before it drifts up to your...
  39. Thread: PTAC's in SFR's

    by brent
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    1,435

    I'm just curious... why do you care so much...

    I'm just curious...
    why do you care so much about the operating costs? If you are selling the units then the home owners will be paying the utility bills. People want their homes to be cool in the...
  40. Thread: PTAC's in SFR's

    by brent
    Replies
    18
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    1,435

    Since you have an upscale housing development...

    Since you have an upscale housing development have you looked into geothermal? You will have warm heat and you can try to market the environmental angle. Another positive is there will not be any...
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    This relates to the original topic. ...

    This relates to the original topic.

    http://www.johnsoncontrols.com/CorpPR/Releases/cg/release1002.asp

    Brent
  42. Thread: PTAC's in SFR's

    by brent
    Replies
    18
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    1,435

    It seems like these homes are going to be...

    It seems like these homes are going to be marketed as "upscale". Correct me if I am wrong.
    I do not think most home buyers would find it acceptable to have mini splits hanging on the wall. Around...
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    Have you had any negative experiences with a cold...

    Have you had any negative experiences with a cold sandwich? When I use the kitchen sink I will run the water (warm) for a little to wash something off, turn it off, turn it on a minute later and so...
  44. Thread: PTAC's in SFR's

    by brent
    Replies
    18
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    1,435

    How many bedrooms do these units have? I am...

    How many bedrooms do these units have? I am assuming the first floor is one open area. You might be able to get away with 1 mini split on the wall but probably not. Upstairs how many units would you...
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    I had scheduled with a York service tech for him...

    I had scheduled with a York service tech for him to come out yesterday (Thurs) to a job site. He didn't show up in the morning and when I called his cell phone it went straight to voice mail. I...
  46. Thread: PTAC's in SFR's

    by brent
    Replies
    18
    Views
    1,435

    Are these going to be single family homes, town...

    Are these going to be single family homes, town houses, or condos? 2 bedroom units?
    I'm not sure if you would save much money installing 2 mini splits and a few pieces of electric baseboard versus...
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    why do you say it is a builder's grade? It looks...

    why do you say it is a builder's grade? It looks like a stellar model which is the standard line. What was the model no? HDB...?

    Brent
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    We have installed a few aprilaire flush mount...

    We have installed a few aprilaire flush mount sensors. They work fine. You have to make sure your building is not in a negative pressure and you have to drill a perfect 1" hole. Check out other...
  49. Thread: Proper trapping

    by brent
    Replies
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    1,241

    The purpose of a trap is to prevent the unit from...

    The purpose of a trap is to prevent the unit from sucking air in from the condensate drain. If air is drawn in from the drain the water will not be able to enter. In your situation the condensate...
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    The latent figure seems way low. I believe most...

    The latent figure seems way low. I believe most programs use 150 latent btu for each person. So for 4 people you should have 600 btu latent just for the people. Typical residential split system run...
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