Page 2 of 2 FirstFirst 12
Results 14 to 20 of 20
  1. #14
    Join Date
    Apr 2008
    Location
    Princeton, NJ
    Posts
    581
    Quote Originally Posted by teddyc27 View Post
    Key1cc sorry for stealing your thread. I am curious your outcome because I plan on having the same thermostat (Possibly the 802) installed. I am no expert, but I would think you would get some cycling when it is mildly warm outside (like 75-80) and long run times when it is (90-100). What is the outside temp when you notice this short cycling? Thanks

    Teddy
    Yesterday it was 90 degrees outside....and I'm not sure 6-10 minutes is defined as short cycling. I took the advice of this site and set my cyles per hour from 3 to 2 today at lunchtime. Afterwork I will monitor it closely this evening to see how it does. The temp will be in the low to mid 90's.
    My compressor protection time is set at 5 minutes.
    Key1

  2. #15
    Join Date
    Jan 2008
    Posts
    91
    Key,

    I've got the 803, too. Do you have humidity control enabled on the stat along with comfort-r? ? How well is it doing?

  3. #16
    Join Date
    Mar 2008
    Posts
    87
    Thanks. Please keep us posted. Just curious, are you using the Comfort-R feature? Where it runs at 50% fan for a minute, then 80% for 8.5 minutes, then if it still needs cooling 100%? From what I have heard it can give longer run times.

    Teddy

  4. #17
    Join Date
    Apr 2008
    Location
    Princeton, NJ
    Posts
    581
    I have some results....but 1st I will answer your questions.

    I do have comfort R enabled (which is only a timer that runs the blower on low for 1 minute then 80% for the next 7 or 8 minutes then 100% if needed....I think). I am not using the dehumidification feature that dehumidifies by over cooling 3 degrees lower than the set point.

    Now the results. I took the advice from the pro's given in this thread and it appears to have worked. (I changed the cycles per hour from 3 to 2 earlier today). At 5:45 PM I begin monitoring as the condenser had just shut off. It was 92F/ 40% humidity outside. Inside was 75 and 44%. The Tstat was set at 75.

    It stayed off for 9 minutes then came on for 23 minutes then off for 12 then on for 19 then off for 23.

    When i first started the test.....the wife had just finsihed cooking so there was extra heat load from the oven....also the temp outside dropped to 86F/46% by the time I had finished as thunder clouds were approaching.

    With all the variables it is still better than the on/off every 6 to 10 minutes I was getting when it was set at 3 cyles per hour (not sure why that is the reccomended setting in the owners manual). I will try monitoring again earlier in the day tomorow hopefully without all the variables.
    Key1

  5. #18
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,879
    They base that on the unit being sized right for the house.

    Over sized systems will tend to short cycle at 3 CPH.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  6. #19
    Join Date
    Apr 2008
    Location
    Princeton, NJ
    Posts
    581
    Quote Originally Posted by beenthere View Post
    They base that on the unit being sized right for the house.

    Over sized systems will tend to short cycle at 3 CPH.
    Question 1. If changing the cph from 3 to 2 is good ....would changing it further from 2 to 1 be better?
    Question 2. Isn't it better for the compressor to run longer? and have long off times rather than quickly on and off trying to stay within 1 degree?

    Question 3. If I do set it on 1 cycle per hour and during the off time the temp changes more than 1 degree. Would the unit condensor come on even if it ment it would have to run more than 1 cph?

    Key1

  7. #20
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    67,879
    Quote Originally Posted by key1cc View Post
    Question 1. If changing the cph from 3 to 2 is good ....would changing it further from 2 to 1 be better?

    Probably not.


    Question 2. Isn't it better for the compressor to run longer? and have long off times rather than quickly on and off trying to stay within 1 degree?

    To some extent, yes. There comes a trade off point. The long run time can be too long and then you are not comfortable with the wide temp spread.

    Question 3. If I do set it on 1 cycle per hour and during the off time the temp changes more than 1 degree. Would the unit condenser come on even if it ment it would have to run more than 1 cph?

    That would depend on how long its previous on time was. It might let it rise further one time then the next. Making it uncomfortable at times.
    Key1
    Within reason, its better for the compressor to have long runs times.
    But, they are made to cycle on and off. All the compressor manufacturers know that compressors will have some short run times at the milder to mid design temps.
    Contractor locator map

    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

Page 2 of 2 FirstFirst 12

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Comfortech Show Promo Image

Related Forums

Plumbing Talks | Contractor Magazine
Forums | Electrical Construction & Maintenance (EC&M) Magazine
Comfortech365 Virtual Event