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  1. Replies
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    Anyone care to elaborate? Am I completely...

    Anyone care to elaborate? Am I completely misunderstanding the meaning and use of CPH?
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    Another question about CPH

    I realize this has been probably asked and discussed before, but I am still left trying to make full sense out of it... from reading some posts here it seems that the CPH settings is a MAX value that...
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    Thanks! My energy efficiency evaluation report...

    Thanks! My energy efficiency evaluation report says I have 4.09 Air Changes per Hour @50 Pa tested with a blower door. I have since blocked a make-up air supply in the basement so might be a tad...
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    Right, as I said - defrost is run internally by...

    Right, as I said - defrost is run internally by the HRV and it's completely independent from the thermostat. I meant the VisionPro IAQ can turn OFF scheduled ventilation, but not defrost

    So what...
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    Oddly it doesn't... But even if it had, would...

    Oddly it doesn't... But even if it had, would defeat the convenience of switching it OFF from the thermostat. There's a reason I paid for a VisionPro IAQ :)
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    I am located in Ottawa, Ontario and we just got...

    I am located in Ottawa, Ontario and we just got out of a week-long deep freeze (-13F). I am turning the ventilation OFF at the thermostat when it's really cold, so I don't over-dry the air but the...
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    When outside air temperature drops, defrost...

    When outside air temperature drops, defrost cycles are automatically run by the HRV every ~30 minutes even if I turn OFF ventilation in VisionPro IAQ. So I have no control over that. But the change...
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    Thanks TB, My issue with the HRV is an odd...

    Thanks TB,
    My issue with the HRV is an odd one... It has 4 speeds plus a standby mode and I have it hooked up and controlled by the thermostat (VisionPro IAQ using VNT1/2 terminals). The HRV...
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    Alternative to HRV

    Hi everyone, I am having an issue with my HRV and looking for either replacing it or other alternatives. In my searches I came upon this:

    http://www.plusaire.on.ca/

    and just wanted to ask if...
  10. Second floor return grill is well... on the...

    Second floor return grill is well... on the second floor :) so yes return air goes through TWO levels of wall cavities to reach the return trunk and unfortunately this is more than usual around here...
  11. Thanks Second Opinion I read this too in the...

    Thanks Second Opinion I read this too in the manual, but here's what's been said in another thread that instilled my doubts:
    ...
  12. So you all agree that a warmer wall will...

    So you all agree that a warmer wall will significantly affect the thermostat? Even with careful air sealing and an extra layer of insulation?

    I also thought about adding the remote sensor -...
  13. Thank you, but I already invested in the VP IAQ...

    Thank you, but I already invested in the VP IAQ and not quite ready to upgrade
  14. Thermostat affected by location - options?

    Hi everyone,
    I am having a comfort issue with my thermostat being installed on a wall that has a heating duct running inside (stupid builder). To make things worse I think the duct also leaks which...
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    Anyone has any thoughts on this? Have enough...

    Anyone has any thoughts on this? Have enough openings in the ducts (plugged), don't want to put another one unnecessarily

    Thanks
  16. OK I goofed, I thought being so small means it...

    OK I goofed, I thought being so small means it MUST be mitered. You're right, the 1-1/2" size is fooling me...

    So the 90s are "long" but the 45s are mitered (I checked their code against the...
  17. This is one other issue I want to raise with...

    This is one other issue I want to raise with them, but I am afraid they will brush it off as "that's the same duct sizing in all houses in the area and there's nothing to do about it". Hence why I am...
  18. The one in the picture above is made by IPEX and...

    The one in the picture above is made by IPEX and is a mitered 90
  19. Don't mean to argue, but... the installing...

    Don't mean to argue, but... the installing contractor has been around for about 20 years, and it's definitely not a flight by night. Now you have to realize the landscape in Ottawa (Canada) is...
  20. You mean "room for improvement" is an...

    You mean "room for improvement" is an understatement, right? Thanks for suggesting the long radius elbows, didn't even think of that. Deductions are almost 3 times less for these (8 down to 3 for 90...
  21. No, it's the original installation

    No, it's the original installation
  22. There is not much they can do outside, but on the...

    There is not much they can do outside, but on the inside I think there is room for improvement... What makes it challenging is the HRV that needs the room in front to open the door
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    HRV ducting improvement

    Hi everyone, I have another question for professionals here...

    When I bought my house I found the HRV was improperly installed (HRV exhaust was pulling hot air from furnace supply, and it's supply...
  24. It's not DIY by any stretch, I am just an HO...

    It's not DIY by any stretch, I am just an HO trying to make sure my furnace will last as long as possible. I am appreciative of all your comments and observations, that's my main reason for coming...
  25. Just to make sure I get this right... the exhaust...

    Just to make sure I get this right... the exhaust is the upper one in the picture, are you saying I should take out the termination 90 elbow and let the pipe open pointing upwards?

    What about the...
  26. Just to make sure I get this right... the exhaust...

    Just to make sure I get this right... the exhaust is the upper one in the picture, are you saying I should take out the termination 90 elbow and let the pipe open pointing upwards?

    What about the...
  27. Thanks! Yes the code here (Ottawa, Canada)...

    Thanks! Yes the code here (Ottawa, Canada) requires insulating vents if they extend further out the wall. The metal spike is actually Stainless Steel wire which I added to stop any bird or other...
  28. This is the exact configuration: - inside the...

    This is the exact configuration:

    - inside the wall each pipe has 3x45 elbows and 1x90
    - outside the wall each has 1x45 and 1x90 before they reach the "termination"
    - what I called...
  29. Not sure why you say there's 5 elbows... Both the...

    Not sure why you say there's 5 elbows... Both the intake and exhaust have 4 elbows each (actually one is 3 the other is 4, but to simplify I used 4 for both), and the ones used on the termination...
  30. So here's a picture of my termination, they look...

    So here's a picture of my termination, they look identical to what the manual calls "standard termination" so I assume I can safely discount them
  31. By termination I meant the final pieces, I will...

    By termination I meant the final pieces, I will take a picture of that and post tomorrow

    Thanks a bunch everyone!
  32. Guys, vent pipes don't terminate at the chimney...

    Guys, vent pipes don't terminate at the chimney inside I never said that... They go outdoors through the side wall. One other thing I forgot to mention - outside termination exhaust is using another...
  33. Furnace model number

    Furnace is an ICP brand (Comfortmaker) and exact model number is G9MAC0601714A
  34. The white box is my VisionPro IAQ's EIM :) I...

    The white box is my VisionPro IAQ's EIM :)

    I will ask for your help here to determine if the venting was sized correctly... The installation manual has a procedure to determine this, and in trying...
  35. Here's a picture (furnace is 60K BTU) and the...

    Here's a picture (furnace is 60K BTU) and the venting pipe size is 2" and 1.5" respectively
  36. I am not sure what you mean... venting is behind...

    I am not sure what you mean... venting is behind furnace in the picture (white PVC pipe) and was installed WITH the new furnace (old one was mid-efficiency vented through the same chimney with the...
  37. Thanks, At the time they installed it we...

    Thanks,
    At the time they installed it we realized the ductwork was undersized but short of replacing most of it there was not much could be done. I mentioned they installed an extra return, and that...
  38. This is the annual check-up required so I...

    This is the annual check-up required so I maintain the warranty. I am doing it a little early, that's all
  39. New furnace - 1 year inspection checklist

    First I want to thank everyone who participates in these forums for providing advice and information!

    I had a new natural gas furnace installed back in January, and looking to have it inspected...
  40. Thank you Ted! You are right on, the 60K mod goes...

    Thank you Ted! You are right on, the 60K mod goes down to 24kBTU output while the 40k two-stage stops at 25kBTU output....

    RE: When and why does it ever go to high - the furnace has a mode called...
  41. So a few months have passed since I had a 60K...

    So a few months have passed since I had a 60K modulating furnace controlled by my existing VisionPro IAQ. Installation went OK with one exception - when the furnace goes on to highest output the...
  42. Anyone has any thoughts on this? I'm trying to...

    Anyone has any thoughts on this? I'm trying to wrap-up the work I've put into re-ducting the HRV

    Thanks
  43. HRV damper defrost port - duct somewhere or leave open?

    Hi everyone, I have a Lifebreath 150 MAX HRV that aside from the "regular" 4 air ports (indoor supply, indoor exhaust, outdoor supply, outdoor exhaust) has an extra (5th) air port used for defrosting...
  44. VisionPro IAQ Discharge Air Temperature Sensor

    I'm looking to monitor the supply air temperature of my ICP (Comfortmaker) 60K modulating using a Discharge Air Temperature Sensor (C7735A1000) wired to my VisionPro IAQ. I had tRise measured when...
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    This is the Ask Our Pro's forum. In order to post...

    This is the Ask Our Pro's forum. In order to post a response here, you must have verified qualifications and have been approved by the AOP Committee. You may ask a question by starting a new thread....
  46. So I finally got quotes from both Lennox and...

    So I finally got quotes from both Lennox and Tempstar and they're both significantly higher than the Comfortmaker (including 10 years labour warranty). From speaking with the Comfortmaker dealer he...
  47. I wasn't trying to put down one-man shops, but...

    I wasn't trying to put down one-man shops, but had legitimate concerns about labour warranty that isn't manufacturer-backed, as well as what level of service can I expect should emergency repair be...
  48. Thanks a bunch for helping! I am expecting a...

    Thanks a bunch for helping! I am expecting a quote early next week for Comfortmaker, discussion with salesman indicates it comes with 10 years parts and labour from ICP (learned here it's very...
  49. OK, I understand the part about the blower...

    OK, I understand the part about the blower maintaining constant 600 CFM to keep tRise fixed at 45. But how does keeping tRise at max make any sense? I attached a snapshot from installation manual...
  50. My point exactly - it's unsafe to operate the...

    My point exactly - it's unsafe to operate the Rheem on Low at 600CFM. If the static pressure increases slightly then tRise will exceed HX max rating. On the other hand the Comfortmaker has a wide...
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