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Type: Posts; User: martik

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  1. Replies
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    My Toutside was about 5C so:...

    My Toutside was about 5C so:
    67000*20/(20+120)*37/(19-5) ~ 29k

    This compares closely to my Manual J model which is 35k at Tdesign of -7C. It would appear my furnace is about 2x oversized. Is it...
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    Thanks for the info. I get 9571 BTU/hr using...

    Thanks for the info.

    I get 9571 BTU/hr using 67000 * 20 / (20 + 120)
    Times are in minutes. Seems very low but the formula makes sense.


    Using the 2nd formula I get the same value (9571):...
  3. Replies
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    945

    pstu

    PSTU:
    I have a similar program (Hot2xp) that models the entire house, rather than room by room, which is free from the CDN government. I'm somewhat reluctant to provide a link as I assume this site...
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    945

    Can a building's heat loss be calculated based on...

    Can a building's heat loss be calculated based on area and temp drop over a given period of time? In my case, at 3C outside my inside temp drops from 19C to 16c in 6hours or 2C every 2 hours in a...
  5. Replies
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    You spent your money on the wrong upgrade. If...

    You spent your money on the wrong upgrade. If your home's energy efficiency is 50 years old, you should have upgraded the insulation, replaced windows (low-e argon), replaced doors and air sealed. I...
  6. Contractor did not want to put in a smaller...

    Contractor did not want to put in a smaller furnace, there are the odd -15 days here and the next owner may want to maintain a higher temp.

    If it only runs twice a day, 4 months a year it will...
  7. After upgrading insulation and windows and...

    After upgrading insulation and windows and replacing a 30 year old 120k NG furnace with a 75k 92% unit, my calculated heat loss went from 110,000 to 32,000 btu/hr. At a setpoint of 19C with outside...
  8. Replies
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    2,037

    Adding more insulation will result in...

    Adding more insulation will result in insignificant savings. Concentrate on windows, air sealing and wall and basement insulation.

    Download hot2xp and model your home's heat load here:...
  9. Replies
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    741

    If I set it to 3 does it create 3 20 min...

    If I set it to 3 does it create 3 20 min intervals? If the setpoint is reached in 5 mins does it keep the furnace off for the next 15 and let the temp drop?
  10. On my programmable tstat the default is 5 cycles...

    On my programmable tstat the default is 5 cycles per hour for a regular furnace and 2 for a condensing. Why is there such a difference? The other option is to disable cycling in which case in starts...
  11. Re: Really, Your data is ___ ?

    My model shows 32% "Usable Internal Gains" (see below):



    HOT2XP Version 2.61 File: HOME_R40_LOW Oct 10/06 12:35:21 Page 1


    ...
  12. Replies
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    2,574

    Contractor simply extended the exhaust 12" to the...

    Contractor simply extended the exhaust 12" to the right. Inspector had no problem with the elbows.
  13. Replies
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    2,574

    make-up

    make-up
  14. Replies
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    2,574

    It is code here in BC (vancouver) near seattle....

    It is code here in BC (vancouver) near seattle. My air leakage is 6 ACH at 50kpa
  15. Replies
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    2,574

    Re: fresh air

    Inspector said that w/o it the same old air would continually be recirculated and would make us feel sick as air would become oxygen depleted. It feeds the main air return duct just above the filter...
  16. Replies
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    2,574

    Inspector says the capped air supply on the left...

    Inspector says the capped air supply on the left is too close (36" min) to the exhaust and must be re-opened. The contractor could either move the exhaust over 12" or extend the fresh air intake 12"....
  17. Replies
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    780

    3000 sqft 75k btu 91% in Pacific northwest coast....

    3000 sqft 75k btu 91% in Pacific northwest coast. Extrtapolate that to 640sqft = 15k btu!!!
  18. Replies
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    780

    For heating such a small space I would use a...

    For heating such a small space I would use a couple of portable or baseboard heaters. We regularily heat our 300 sqft kitchen/family room with one 1500 watt (5200btu) heater with winter temps down to...
  19. Replies
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    525

    After reading the "Ignorance" thread (closed), I...

    After reading the "Ignorance" thread (closed), I would like to say a big thank you to all of you for your many helpful responses helping me select a condensing gas furnace and ensure the contractor...
  20. Replies
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    It works! I was expecting the fan to come on...

    It works! I was expecting the fan to come on immediately but had to wait a few secs for it to startup after turning on the safety switch. I guess it needs to run thru some self diagnostic on power up.
  21. Replies
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    792

    In summer, our basement, where the gas condensing...

    In summer, our basement, where the gas condensing furnace is located, is about 15F cooler than the main floor. There is 1 return duct in the basement and 2 on the main. Would it be possible to cool...
  22. Replies
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    630

    Tech 91 G191BU gas condensing just installed this...

    Tech 91 G191BU gas condensing just installed this year. The terminal block on the PCB has 5 terminals marked R C W Y G. This is no fan limit switch
  23. Replies
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    630

    Anyone? I tried jumping the R and G but the fan...

    Anyone? I tried jumping the R and G but the fan does not come on. It's hot as hell here.
  24. A gigajoule (GJ) of Natural gas costs approx $10...

    A gigajoule (GJ) of Natural gas costs approx $10 which is about 1 million btu. So a lower COP rated HP would not save significant $? We use approx 60 GJ's per year.
  25. Replies
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    630

    I want to run the blower during hot days (furnace...

    I want to run the blower during hot days (furnace is in the cooler bsmt) My thermostat does not have a fan setting just 2 wires connected to R and W terminals. Can I run a jumper between R and G to...
  26. Replies
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    549

    How much noise is normal? I need to turn the TV...

    How much noise is normal? I need to turn the TV volume up about twice as loud when the AC is running. It makes some gurgling noise when the compressor first kicks in. Would some foam padding where...
  27. Replies
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    Install manual states that the exhaust must be...

    Install manual states that the exhaust must be 18" above intake in extremely cold climates and only 6" in milder climates. I am in the Seattle area. Is that considered mild?

    Is a screen required...
  28. Replies
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    dandyme: There is only one other 90degree and a...

    dandyme: There is only one other 90degree and a 45 in each pipe, both short radius.

    Where could I purchase a better hanger? Link?
  29. Replies
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    Any ideas how to improve the looks of this...

    Any ideas how to improve the looks of this termination? Notice how the exhaust pipe is at an angle (due to the slope of the pipe inside). Also, there is a screen on the intake but none on the...
  30. Replies
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    Sounds like rushing air, low pitch - no rattles

    Sounds like rushing air, low pitch - no rattles
  31. Replies
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    673

    Horizontal in bsmt furnace very noisy (audible...

    Horizontal in bsmt furnace very noisy (audible from 1st and 2nd floor) when burners start as well as when fan starts. Is this normal for this model of furnace?
  32. Thread: Crimped HX

    by martik
    Replies
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    566

    What is the difference between a crimped on...

    What is the difference between a crimped on primary HX and welded? My contractor had a look at the Fridgidaire and refused to install it because of the crimping and yet recommends the armstrong which...
  33. Replies
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    I called Lennox for the AFUE of my 28 yo furnace...

    I called Lennox for the AFUE of my 28 yo furnace and they said no testing was done back then so they could not give me a rating.
  34. Replies
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    476

    The contract contains a completion date of June...

    The contract contains a completion date of June 30 - 50% down and balance on fire-up. I know the contractor cannot control the supplier's delivery times. I guess I'm just frustrated after dealing...
  35. Replies
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    IS this Normal? Contractor A provides quote...

    IS this Normal?

    Contractor A provides quote and I accept, he says " I'm busy, call me back in a couple weeks". So I call back and he promises to be out the next day. He doesn't show up or call....
  36. Good old pythagorean theorem sqrt of (8^2 +...

    Good old pythagorean theorem

    sqrt of (8^2 + 6^2)

    Thanks for the help!
  37. My dryer vent is 8 ft below and 6 ft horizontal...

    My dryer vent is 8 ft below and 6 ft horizontal from the proposed location of the intake. Could this cause any contamination of intake air?
  38. Replies
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    715

    Here's an alternative ...

    Here's an alternative

    http://www.buildingsgroup.nrcan.gc.ca/software/hot2xp_e.html
  39. Replies
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    1,066

    At which COP? So at 0C I would extrapolate it to...

    At which COP? So at 0C I would extrapolate it to be 300% efficient?
  40. Replies
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    1,066

    Deme: How well does your HP work in that...

    Deme:

    How well does your HP work in that climate? Do you ever need backup heat? Seer, COP rating?

    I'm in your area (North Delta)
  41. Replies
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    http://www.ourcoolhouse.com/monitor/monitor.htm ...

    http://www.ourcoolhouse.com/monitor/monitor.htm

    Don't know if this person will ever see a payback but it's one hell of a cool design.
  42. Replies
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    http://www.bchydro.com/powersmart/elibrary/elibrar...

    http://www.bchydro.com/powersmart/elibrary/elibrary669.html

    "In the heating mode, do not set the temperature back at night or when you are at work unless a "smart" programmable heat pump...
  43. Replies
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    637

    He was highly recommended by the supplier. Spent...

    He was highly recommended by the supplier. Spent 2 hours here on his initial visit and based on what I have learned here he was the most knowledgable and honest.

    I did ask him why his prices are...
  44. Replies
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    Not yet the contractor is backed up a few weeks....

    Not yet the contractor is backed up a few weeks. I'll post a picture when he's done.

    I considered DIY, even talked to the local gas inspector, who had no problem with it, but I found a reasonable...
  45. Replies
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    637

    Reading the specs for a Nordyne 60k upflow states...

    Reading the specs for a Nordyne 60k upflow states that maximum length(s) for non direct 1 pipe vent (2") are 60' vs. 30' for 2 pipe direct vent. Why such a huge difference?
  46. Thread: Frozen House

    by martik
    Replies
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    919

    That's Hola not Ola, the 'H' in spanish is silent

    That's Hola not Ola, the 'H' in spanish is silent
  47. Replies
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    18,716

    Reading all the contradicting opinions, I think I...

    Reading all the contradicting opinions, I think I have a 1% chance of finding a contractor who knows what they are doing.
    Definately will not choose a 2 stage as chances are lowered to less than 1%...
  48. Replies
    329
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    18,716

    Assuming the furnace is correctly sized, how...

    Assuming the furnace is correctly sized, how could a single stage be as or more comfortable than a dual?
  49. Replies
    329
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    18,716

    Are you saying that it can achieve 92% (as rated)...

    Are you saying that it can achieve 92% (as rated) in both stages? Could you tell me which adjustments are necessary so I know the technician is following the correct procedure?
  50. Replies
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    With a max of 55% efficiency on 2stage I would be...

    With a max of 55% efficiency on 2stage I would be DECREASING my efficiency! We never felt uncomfortable with the old single stage w/o VS.
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