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Type: Posts; User: hcong

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  1. Replies
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    Ditto, always listen to the manufacturer and...

    Ditto, always listen to the manufacturer and don't do anything that can void the warranty like creating an opening in the back.
  2. The kW power consumption numbers are...

    The kW power consumption numbers are instantaneous, they doesn't always translate nicely into kWh which is what your electricity company bills you for.

    The nice thing about the ductless splits is...
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    California Energy Codes say minimum 13 SEER for...

    California Energy Codes say minimum 13 SEER for your original 2010 condenser. SEER is cooling capacity divided by watts of power used, so a 16 SEER should theoretically use 23% less electricity than...
  4. 9 tons should be more than enough for your house....

    9 tons should be more than enough for your house. How is your airflow from your supply registers? What temperature is coming from those supply registers. Lastly, does your ac keep running constantly...
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    Looks like your min and average temperatures are...

    Looks like your min and average temperatures are pretty low for a heat pump. From your product number, you don't have any aux/backup heat. Is it warming the place up at all? I see your indoor unit...
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    Thanks!

    Thanks!
  7. Replies
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    Why is Rheem so hard to get a hold of?

    Anyone have old product data on an RRGG-07N42JKR? Any reps from Rheem located in the San Diego office?
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    College Degree Pros & Cons (Engineering) ...

    College Degree Pros & Cons (Engineering)

    Pros:
    1. Can say you have a degree.
    2. Can take 8 hour state exams and say you are now an "engineer-in-training"
    3. Can take another 1-2 day exam...
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    Poll: We are using Daikin REYQ240PBTJ with 12 zones of...

    We are using Daikin REYQ240PBTJ with 12 zones of mixed FXMQ & FXZQ. We have 12 branch selectors, and 12 nav. controllers. We have a MUA, exhaust fan, and Daikin VAMs for the OA requirements.

    We...
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    Poll: Yeah, we just met with the building owner and one...

    Yeah, we just met with the building owner and one of them is German (Europe had these for a while) and it is pretty much a done deal. I made some phone calls and only negatives on heard was that the...
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    Poll: Why is that?

    Why is that?
  12. Replies
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    Poll: VRF Systems - Would you recommend one?

    We have a project here that is a potential for those City Multi-split systems. We looked at both Daikin and Mitsubishi options (24 tons). I know these systems have been around for 20-30 years in...
  13. Ultra Sensitive to Dust, Mold, Pollen Design

    Hi all,

    I have this client that is ultra sensitive to everything and has a phobia fans. So here is what I have looked at putting in. Let me know if you have any recommendations.

    1. Humidity...
  14. Wattage Meter to Track Roommate's Electric Use

    Hey, anyone know of a good wattage tracking meter that you can plug in appliances to? Roommate is running his server nonstop curious if that is really causing the high electric bills.
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    My question is why you would want that? Primary...

    My question is why you would want that? Primary drain getting overfilled?
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    There is also Sea World, Legoland, and Safari...

    There is also Sea World, Legoland, and Safari Park if you like theme parks. I would visit Balboa Park too.
  17. Thread: Garage Heater

    by hcong
    Replies
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    2,162

    Try William Comfort Products. They come with...

    Try William Comfort Products. They come with direct vent/side vent options. No fan required.

    http://e-wfc.com/heating/
  18. Replies
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    Haha, thanks your guys. I found a field installed...

    Haha, thanks your guys. I found a field installed propane conversion kit, made sure the unit said Nat. Gas/Propane... and I am done :)
  19. Replies
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    Propane Rooftop Packaged Unit?

    Hey, I have a contractor who needs a propane packaged system... I never really heard of one before. Any suggestions?
  20. I usually look at overall performance over...

    I usually look at overall performance over whether the company brands it "Comfort" or "Performance." I do engineering and energy analysis so I focus on SEER and HSPF values. The higher the value the...
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    Then that examples why the spec manuals are off.

    Then that examples why the spec manuals are off.
  22. Replies
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    I would say 6 ton gas package unit... but the "J"...

    I would say 6 ton gas package unit... but the "J" in 48TJD is a little confusing since the spec manual says TJs are 15+ tons.
    ...
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    If manual J was done right and suggested a 3.79...

    If manual J was done right and suggested a 3.79 ton then your 4 ton system is fine. I usually don't oversize coils, but I know some do to get higher efficiency. So the coil should be fine.

    Is the...
  24. I don't think there is a boycott on Carrier...

    I don't think there is a boycott on Carrier products... people probably are just working or haven't had the time to look up model numbers. I usually spec Carrier.
  25. The "B" in HBC & FB4 stands for base model, the...

    The "B" in HBC & FB4 stands for base model, the "C" in HCC stands for comfort model. "V" in the FV4 is the performance model (variable speed). There are four tiers, base/comfort/performance/infinity....
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    You probably have to get a HERS (Home Energy...

    You probably have to get a HERS (Home Energy Rater) aka third party to do the testing. Not bad though, they aren't usually contractors so no conflict of interest and trying to sell you stuff.
  27. Replies
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    If all those items got put in correctly, then you...

    If all those items got put in correctly, then you have a very efficient house and if they did load calculations, they probably figured a single 4 ton was enough. The perks of a dual zone is you...
  28. Replies
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    Yeah, I have gotten some comments from...

    Yeah, I have gotten some comments from contractors and architects that load calculation numbers have been over estimated at times. I assume there are just factors that aren't accounted for... like...
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    Yep load calc first, see if you can get the unit...

    Yep load calc first, see if you can get the unit down in size. Also the load calculation might show that you don't need so much airflow. It will be loud, but you also can try to upsize the blower fan...
  30. Thread: 1/4 liquid line?

    by hcong
    Replies
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    2,559

    The 2 ton @ 50 ft lineset (outdoor unit below...

    The 2 ton @ 50 ft lineset (outdoor unit below indoor unit) is cutting it close but doable for Carrier ACs. The manufacturer will provide a chart to shows cooling capacity drops and as long as the...
  31. This is for an hospital operating room? The only...

    This is for an hospital operating room? The only part I don't understand is why the chilled water should be running at 30 F below... should the 50 below setting of heating or cooling the air to 50 F...
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    I did some free engineering for you... quick and...

    I did some free engineering for you... quick and dirty calculations and I think there is something wrong with your numbers. I assumed high bay industry (40 workers) and retail space (66 customers) in...
  33. Replies
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    You can get a 2 ton HP with 6 kw electric...

    You can get a 2 ton HP with 6 kw electric resistance heat. Your indoor blower will need can be 800 CFM. If your ductwork is complex, maybe a 1200 CFM blower.
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    Yeah, the 16 SEER is only 16 SEER when you match...

    Yeah, the 16 SEER is only 16 SEER when you match it up with a Furnace of the same caliber. How are you going to tell the heat pump when to turn on?
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    Thanks you guys, this really helped! :)

    Thanks you guys, this really helped! :)
  36. Replies
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    Singer Heat Pump Tonnage

    So there is this Singer FV400833 heat pump. I believe this is pretty old, anyone have literature or know the tonnage?
  37. Replies
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    I haven't heard of heat pumps going out sooner...

    I haven't heard of heat pumps going out sooner than AC systems. I would definitely go with the variable speed fan and two stage compressor. If the compressor is only single stage then you are usually...
  38. The general question that everyone asks is did...

    The general question that everyone asks is did you get a load calculation done? Humidity problems are usually due to oversized units. Higher electricity bills may also mean shorter on cycles because...
  39. 1). Yes. mini-splits can get up to 21 SEER and...

    1). Yes. mini-splits can get up to 21 SEER and this is a lot cheaper than what you would be paying for a similar efficiency split system. Mini-splits also get as small as 1 ton, smallest split...
  40. Replies
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    If the ductwork is not indoors, then it needs to...

    If the ductwork is not indoors, then it needs to be insulated. I agree with Lentz, check the plumbing also because inspectors can miss stuff.
  41. Replies
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    Your duct are not undersized. How many people are...

    Your duct are not undersized. How many people are in the rooms? Residential units defer because they assume not many people and there isn't any outside air requirements. Your 2 ton might be a little...
  42. Replies
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    If the room is 71 F when the alarm goes off, then...

    If the room is 71 F when the alarm goes off, then I don't think it is going off due to high heat... is there something wrong with the alarm sensor? Or is the alarm sensor both a temperature and...
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    The perk of living in California is all new units...

    The perk of living in California is all new units need Title 24 energy calculations... so your hvac contractor should run calcs and size your system accordingly. Do you live in the East Bay? I...
  44. When the fan is "on" then it is running even if...

    When the fan is "on" then it is running even if you do not have your heating or cooling on (basically re-circulating the air). When the fan is in "auto" mode then it will only turn on when you are...
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    I understand that part, my question is whether...

    I understand that part, my question is whether there is an independent duct to the A/E, then from the A/E to the supply registers. The current drawing shows air coming from the basement and out the...
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    My confusion is why the supply is in-taking air...

    My confusion is why the supply is in-taking air from the basement? Unless your "supply line" means as supplying your A/E (which is actually the return for the levels).
  47. I would use size the unit based on ACCA Manual J...

    I would use size the unit based on ACCA Manual J then tell the Tech guys what Sensible load, Latent load, and CFM you want to meet. There really isn't a easy way to get engineering data, even us...
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    Yeah, you will get similar debates here. I see a...

    Yeah, you will get similar debates here. I see a lot of copper with aluminum fins (as a compromise). I heard about higher leaks with all aluminum coils where it meets the copper refrigerant lines....
  49. Replies
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    At night the fan won't need to be on "full blast"...

    At night the fan won't need to be on "full blast" and actually the lower the fan speed/CFM the more moisture is removed from the conditioned air. The Santa-Fe Dehumidifier is for your crawlspace and...
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    To confirm, no cooling just heating? I am...

    To confirm, no cooling just heating?



    I am a bit confused about the basement intake. It seems like you have an air intake in your supply? From what you said, it sounds like your have the intake...
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