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  1. Replies
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    Airflow for heat isn't a problem. the house is...

    Airflow for heat isn't a problem. the house is heated with a hydronic system (baseboard radiant heat) that operates independently of the AC system. It sounds like the consensus is that I either have...
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    If we increase the cycle time and decrease the...

    If we increase the cycle time and decrease the coil temperature to improve dehumidification, won't we supply colder air to the room and shut the thermostat off from the cold air entering the room? In...
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    Udarrell, I don't disagree with you. Sizing is...

    Udarrell,

    I don't disagree with you. Sizing is a large piece of the puzzle. Prior to installation, I asked the HVAC company to do a Manual J and a Manual D. They had the wholesaler do the...
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    Thanks Motoguy (and everyone else taking the time...

    Thanks Motoguy (and everyone else taking the time to try and help). The 3T unit has a properly sized 3T condenser (I'm told). The 1.5T unit is new (Rheem) and I saw them install a new Rheem...
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    Thanks Dan, I'm not sure what he total run...

    Thanks Dan,

    I'm not sure what he total run times are. I would have thought when it was 80F, the bedroom unit would have been running almost all day, but it doesn't, although the tech set it up to...
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    I don't have the model numbers for the inside and...

    I don't have the model numbers for the inside and outside units. I can get them (when I get back to the lake), but a trip to the attic is required for the inside unit information and I believe they...
  7. Replies
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    That is what I though.

    That is what I though.
  8. Replies
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    RH Humidity Problems - Help!

    I'll try to keep this as short as possible.

    I have a 3,000 sq ft ranch style home in western Canada. We had new AC system installed 5 years ago, including ductwork in the attic of our home. 2 AC...
  9. Replies
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    1,554

    Thank you for your comments. My primary concern...

    Thank you for your comments. My primary concern is for dehumidification in the summer. I'd also like some fresh air in the house (basement) summer and winter as not much air moves downstairs. I could...
  10. Replies
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    1,554

    HRV - Dehumidifier - Basement

    We live in prairie region of Canada in a single story 3,200 sq ft home with the same space in our basement. Our house is heated with radiant heat on both levels and with attic installed air...
  11. Replies
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    1,559

    I think most setback thermostats learn how long...

    I think most setback thermostats learn how long it will take at a given outside (and inside temperature) to get the house back to the desired temperature. Our old Honeywell thermostat did this 20...
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    1,559

    Our Tekmar control system monitors outside...

    Our Tekmar control system monitors outside temperature and insider temperature as well as the rate of temperature drop and temperature rise. From this, it calculates how may BTU's our Weil McLain...
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    I am dealing with a similar question with my 3...

    I am dealing with a similar question with my 3 year old Rheem equipment that was oversized. I have 6 ton total (2 - 3 ton units) and the manual J calls for 4.5T. Problem is you can't get 1/2T...
  14. Replies
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    1,631

    Who knows; maybe the duct temp sensor is...

    Who knows; maybe the duct temp sensor is defective. I'm able to read supply and duct temperatures on my Tekmar display (at the thermostat).
  15. Replies
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    1,160

    I just asked Rheem Canada this question as we are...

    I just asked Rheem Canada this question as we are replacing a wrongly sized 4 year old system with a new R410A system. Rheem said that as long as the line sets are the correct size and the correct...
  16. Replies
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    I looked at these systems and decided to avoid...

    I looked at these systems and decided to avoid them as I found the airflow too noisy.
  17. Replies
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    11,994

    I haven't seen the load calc yet, but I plan to...

    I haven't seen the load calc yet, but I plan to have it re done or at least review what they have done. The outside contractor didn't re do the manual J but felt that 2.5T in the LR and 1.5T in the...
  18. Replies
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    Rheem Canada finally got back to me. You are...

    Rheem Canada finally got back to me. You are correct, we can use the same lines for R410A provided they are the correct size and they are cleaned properly. You are also correct that the 2 stage units...
  19. Replies
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    Actually, I do have venting. Right now the...

    Actually, I do have venting. Right now the outside temp is 27C and the supply is 38C (so +11C compared to outside air @ 8:15 PM central time). The duct is 16C. I have newer roof on the house (5...
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    Well, we have a medium/dark roof on our bungallow...

    Well, we have a medium/dark roof on our bungallow (ranch style) and all of the ductwork is in the attic space, double wrapped with insulation. Last week it was 33C with the R/H at 80%. The Tekmar...
  21. Replies
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    What is the cost difference (percentage wise)?

    What is the cost difference (percentage wise)?
  22. I'm considering a 2 stage on a 2 Ton. For me it...

    I'm considering a 2 stage on a 2 Ton. For me it is a question of comfort, not a question of getting my money back. I'm no expert but allot of research is leading me to conclude that a 2 stage system...
  23. Replies
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    11,994

    Thanks, I get that. :) but what about a 2 stage...

    Thanks, I get that. :) but what about a 2 stage 2Ton in pkacw of a 1.5T single stage?
  24. Replies
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    I hope the installation works out for you. On the...

    I hope the installation works out for you. On the heating side I know the joy of room to room zone control. We have a 3,200 sq ft ranch style home and installed a new boiler system (baseboard radiant...
  25. Replies
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    11,994

    I spoke to Rheem customer service this morning....

    I spoke to Rheem customer service this morning. They say that unless the 3T units are being replaced with old stock R22 units, the lines should be changed.

    For the more complex question of how to...
  26. Replies
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    I wouldn't size my AC system for a "party load"...

    I wouldn't size my AC system for a "party load" unless you get a 2 stage system that can run at 1/2 capacity when you aren't having parties. My contractor ignored a Manual J and sized 6 ton of...
  27. Replies
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    Thanks for the reply. I guess I'll have to...

    Thanks for the reply. I guess I'll have to contact Rheem directly to know whether the lines from our R22 3 ton system will be the correct size for a new 1.5 and 2.5T R410 installation. I can't ask...
  28. Replies
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    11,994

    The question will be whether we will have more...

    The question will be whether we will have more comfort from single stage units totaling 4Ton, or two stage units totaling 5 ton? Glad to hear the Rheem has a horizontal air handler/coli. Is it...
  29. Replies
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    11,994

    Thanks for your replies. The HVAC company has...

    Thanks for your replies. The HVAC company has come back with an outside consulting firm. They confirmed that we have way too much cooling capacity @ 6 tons and recommend 1.5T for the bedroom unit and...
  30. Replies
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    14,653

    What is the Collage you've been to? Some people...

    What is the Collage you've been to? Some people here have probably been to College, but I've never heard of a Collage.
  31. Replies
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    My question is if she had 4 ton and the...

    My question is if she had 4 ton and the calculation showed she needs 3.5 Ton, can you just put a 2 stage 4 Ton in and then if she had a bit too much cooling the system will operate in stage 1 most of...
  32. Replies
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    Actually, now that I think about it, the unit...

    Actually, now that I think about it, the unit that was freezing had a blockage in one of the lines, creating a pressure problem. I've been pretty involved in the adjustments to our system and was...
  33. Replies
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    Money is always an issue, but after what we've...

    Money is always an issue, but after what we've been through over the last 4 years, we have to consider comfort too. If a 2 stage system will keep the humidity down better and will provide longer run...
  34. Replies
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    It might be false, but that is what happened. The...

    It might be false, but that is what happened. The problem went away as soon as the variable speed motor was turned up again. Another poster said he turned his fan speed down from 400 cfm/ton to 280,...
  35. Replies
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    We have a 3,200 sq. ft. ranch style home near...

    We have a 3,200 sq. ft. ranch style home near North Dakota. The house has radiant heat so we elected to install 2 sets of ductwork in the attic (all new). The wholesaler did teh manual J (they say)...
  36. Replies
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    14,653

    AC Bad Dog, Beenthere, Thanks for your posts....

    AC Bad Dog, Beenthere,

    Thanks for your posts. As you can tell, I'm just trying to educate myself a bit more this time around. Hopefully by doing so, I'll have a better dialog and better chance for...
  37. Replies
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    I was told that if you drop below 400 cfm/ton...

    I was told that if you drop below 400 cfm/ton you'll ice up the evaporator coil. That is what happened in our home.
  38. Replies
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    Replacing R22 System with R410A - New Lines??

    We will be replacing our 4 year old R22 AC system with a new properly sized system (total tonnage is going down). We currently have 2 separate systems (ductwork, outside units and air movers) rated...
  39. Replies
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    14,653

    This question is well on point for me. I am...

    This question is well on point for me. I am shopping for a central air system for the second time in 5 years. I live in the prairie region in Canada where we have July/August temperatures in the mid...
  40. Replies
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    I'm not too concerned about Legionnaire's...

    I'm not too concerned about Legionnaire's disease. Even if the bacteria were to develop, it would be killed once the tank temp comes back up to 192C. The tank is kept at this temperature in the...
  41. Replies
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    Vacation Temp - How Low is Too Low??

    Hi,

    We have a Weil McLain gas fired hot water heat system in our 3,200 sq. ft. bungalow. It is controlled by a Tekmar system. We are going on a 2 week vacation and will lower the heat in the house...
  42. Replies
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    1,245

    Thanks for the replies. I'd prefer not to use a...

    Thanks for the replies. I'd prefer not to use a "jumper duct" from the bedrooms to the hallway as noise from the rest of the house will travel easily into the bedrooms.

    As for the cfm air flow; I...
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    In my case, that would mean running a duct back...

    In my case, that would mean running a duct back to the main return plenum. The 20" x 20" return grill is placed about 4' from the air handler. The rest of the duct work is on the outfow side.

    The...
  44. Replies
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    Return Air Vent Sizing

    I have a 3,200 sq. ft. single level home servced by 2 - 3 ton AC unts. The duct work and air handlers are in the attic. The first until services the LR/DR/Kitchen/Den, all fairly open areas. The...
  45. Replies
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    Can we adjust airflow below 400cfm/ton without...

    Can we adjust airflow below 400cfm/ton without icing up the coil in the air handler? If not, we would need to have a smaller tonnage unit to be able to reduce airflow, correct?

    To measure...
  46. Replies
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    849

    I'm not sure who makes the air handlers. I do...

    I'm not sure who makes the air handlers. I do know that they are variable speed units (ECM). THe HVAC company tells me the minimum cfm per ton is 400, so with a 3 ton unit, that would mean 1,200cfm....
  47. Replies
    8
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    849

    Summertime Relative Humidity

    We had a new air conditioning system installed in our home 2 years ago. It has never really provided us with a comfortable air conditioned environment.

    The ac system can produce allot of cold air...
  48. Replies
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    Is the ductwork properly balanced? What is the...

    Is the ductwork properly balanced? What is the size of the kitchen relative to the LR? Airflow whould be matched to the room size, I would think. Is the LR colder than the kitchen?
  49. Replies
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    Hi John, thanks for the suggestion. The air...

    Hi John, thanks for the suggestion.

    The air movers were shut off last week with no improvement in RH. We can't run the duct heaters without air flow as there is a built in protection mode to...
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    Thanks for the suggestions firecontrol, I...

    Thanks for the suggestions firecontrol,

    I agree that it is a mistake to jump on the last change that was made, as it may be something that happened coincidentally at the same time that resulted in...
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