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Type: Posts; User: Keith_O

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  1. Replies
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    thanks for the email. My Trane dealer called back...

    thanks for the email. My Trane dealer called back and said it is a various peed obsolete unit. it can't be combined with any furnace today. they don't make any parts or accessories for it. He said it...
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    trane 2 stage condenser wiring

    I'm trying to help out a contractor friend of mine. he is working on a Trane TTS748A100AO 2 stage ac and the wiring diagram is missing. The last contractor quit on the job and left it not hooked up....
  3. Thread: Thermal Imager

    by Keith_O
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    7,014

    With the heater or A/C on I usually turn on some...

    With the heater or A/C on I usually turn on some exhaust fans, wait about 10 minutes and take a look at the attic, walls and ducts. I will use the blower door on low if there aren't any exhaust fans...
  4. Thread: Thermal Imager

    by Keith_O
    Replies
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    7,014

    I have a Flir B60. I think it was around $6K...

    I have a Flir B60. I think it was around $6K when I bought it a year ago. I do whole house energy and comfort retrofits though. Insulation, Air Sealing, HVAC. It is more for the customer than me....
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    With a tank hot water heater the cooler water...

    With a tank hot water heater the cooler water comes in and mixes with the hot water creating a new temperature which is heated to exactly it's set point. A tankless would need to modulate pretty low...
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    I put in First Co units in California mainly...

    I put in First Co units in California mainly because furnaces are too large for our loads. That is probably why the utility is recommending them. PG&E offers a class on them.
    I normally set them...
  7. Thanks airtight. I was thinking about astro foil...

    Thanks airtight. I was thinking about astro foil and tape for that same reason. I am still not sure about astro foil but I have used it a couple times. I actually started a thread on this site to...
  8. Thanks Genduct. I know that our humidity is low...

    Thanks Genduct. I know that our humidity is low here I was just double checking about the vapor barrier.
    I'm not planning on sealing the ducts themselves, just the boots, connections, plenums,...
  9. Yes, it is the other 25% that I am concerned with...

    Yes, it is the other 25% that I am concerned with that aren't on the attic floor. Also, I am concerned with future jobs that may not include attic insulation but the client wants there R-4 ducts to...
  10. Thanks for the reply. It isn't a sealed...

    Thanks for the reply. It isn't a sealed combustion unit so no. There is adequate ventilation in the attic.
    I should have been more specific with my question. I want to know about adding duct wrap...
  11. Duct insulation around wire flex with vapor barrier

    So I have been getting asked to seal and insulate over existing flex ducts. Whenever I test these systems I almost always give a price for replacement due to incorrect sizing, leakage, low...
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    Where are you located? What are your heating...

    Where are you located? What are your heating loads and heating degree days?
    I put in combined hydronic units with the Vertex hot water heaters and with standard efficiency hot water heaters...
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    Thanks for the reply. What kind of insulation...

    Thanks for the reply. What kind of insulation are you recommending? R-8 what? Fiberglass duct wrap, FSK?
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    Thanks. I also insulate to R-8 (code here is...

    Thanks. I also insulate to R-8 (code here is R-6). One of the jobs is for duct sealing and insulating KD pipe. The only way I could do it with astro foil is to insulate it with fiberglass duct...
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    Duct Insulation - Astro Foil

    Does anyone have any experience with Astro Foil insulation for ducts and plenums? I was asked by a contractor to put it in on a job a month ago and by a homeowner yesterday. I have always used...
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    It is a standard gas water heater.

    It is a standard gas water heater.
  17. Replies
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    ASHRAE 62-89 Volume * .35 / 60 = Airflow CFM ...

    ASHRAE 62-89

    Volume * .35 / 60 = Airflow CFM

    (7000 * 8)*.35/60 = 326 cfm

    This is to get you .35 air changes per hour. Have you done a blower door on your house to test infiltration? What...
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    All I am saying is to make sure you have created...

    All I am saying is to make sure you have created an adequate air barrier in your attic and crawl before you seal your windows. How is that "nonsensical"? I have done a lot of home sealing along...
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    Do you have ECM motors in your air handlers? If...

    Do you have ECM motors in your air handlers? If not, running both of those units 24/7 will cost you a lot of money in electricity. Up to 800 watts per unit. I would recommend a separate system...
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    That's if you do supply ventilation. And if...

    That's if you do supply ventilation. And if given a choice, what air would you rather breathe - Air coming from your attic, crawlspace or your leaky window?
    Windows should be the last place to...
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    Air sealing the attic and the crawlspace should...

    Air sealing the attic and the crawlspace should be your first measure. Windows would be the last thing to seal if you are concerned with air quality. That is the only good air you have being...
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    Pretty funny. If you don't mind, how much did...

    Pretty funny. If you don't mind, how much did that install cost you?
    Also, did he use any mastic or at least tape on your plenums / unit?
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    -Advanced framing 24" on center 2x6 studs...

    -Advanced framing 24" on center 2x6 studs
    -Windows facing south for solar heat gain and correct eaves for shading in summer. Good thermal mass on that side.
    -Cellulose wall insulation
    -Loose fill...
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    Like said before, make sure they do a Manual J...

    Like said before, make sure they do a Manual J before replacing equipment. Also, get your duct leakage tested while you're at it. I see an average of 30% leakage out here and it's usually not a huge...
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    Thanks Tiger. Nice picture.

    Thanks Tiger. Nice picture.
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    ASCJ, Are you suggesting a mini split with...

    ASCJ,

    Are you suggesting a mini split with only one fan coil? Multiple fans would cost a lot of money to service the main rooms. Would you suggest one fan for a main room or multiple? I do not...
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    Thanks for the tip. The FirstCo 18HBQB gets down...

    Thanks for the tip. The FirstCo 18HBQB gets down to 295 cfm which is adequate. 800 would be way too much though. The client has asked for an ECM motor so that is why I listed the 24HBQB earlier...
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    Also, I am trying to look for other hydronic air...

    Also, I am trying to look for other hydronic air handler options and not oversize the unit. That is why I started this topic.
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    One of my quotes is for a mini split system. The...

    One of my quotes is for a mini split system.
    The hydronic air handler setup will cost them about $100 - $150 / yr to run off of their existing hot water heater.

    Keith
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    First Company 24VHBQB. 120 degree water, 20...

    First Company 24VHBQB. 120 degree water, 20 degree TD is my normal setup. I will have to reduce the water flow to reach my desired output but it will be oversized.
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    Heat exchangers are required here for that setup...

    Heat exchangers are required here for that setup because I will be using the existing standard hot water heater. It is required to separate the drinking water from the radiant water.
    The air...
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    A baseboard system ends up being pretty expensive...

    A baseboard system ends up being pretty expensive and I don't have much experience with them. The heat exchanger setup is what gets expensive. It is also a 500 s.f. house so there is little to no...
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    Will do, thanks for the tip!

    Will do, thanks for the tip!
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    Combined Hydronic Air Handlers

    I know that a lot of you have real heating loads but I am in California so bare with me. I am working on a 500 s.f. house with a 10,000 btuh heating load in Berkeley that is currently heated with...
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    New Guy from California Bay Area

    Hi,

    I am a 33 year old General and HVAC contractor in California. I generally do Green Building and Home Performance work here is the bay area. I have looked at this site for a while but never...
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