Ohio Geo run time question

Discussion in 'General Discussions' started by nightowl, Dec 14, 2016.

  1. nightowl

    nightowl New Member

    I had my broke 20 year old 2.5 ton Water Furnace replaced with a 3 ton Century geo back in Sept. The water Furnace had a single stage compressor and aux heat. Aux heat ran a lot in cold weather.
    The Century has a 2 stage compressor plus aux heat. It finally got cold this last week with temps in the low 20's and wind. The geo would go from stage 1 to 2 to aux then off and keep the temp right at 70.
    Yesterday it was in the high 20s, little wind, stat set at 68 and it ran in stage 1 almost constantly, shutting off now and then but kept the temp steady at 68. I set stat to 67 before I left for work, got home and it is 7 outside, no wind and running stage 2 then dropped to stage 1 and holding steady at 67.
    Should it be running constantly without shutting off?
    I have a closed loop with water temps in the low 30's, which leads to my next question.
    My stat is Heat Controller, INC. communicating thermostat. When I go into system status it says the leaving water is 3 degrees warmer than the entering water. When I check at the unit in the ports with a thermometer is is the opposite. I'm assuming wires are crossed somewhere. Would this cause any problems with operation?
    My water temps are 31 entering and 34 leaving checked at the unit. opposite at the stat.
    I am firing up the wood stove to give it a rest and get it to around 75+ in here.
    Thanks for any input.
  2. urthbuoy

    urthbuoy Well-Known Member Industry Professional Forum Leader

    You need to clarify what you are saying about the temps of the water. d

    But generally, nothing wrong with long run times.
  3. nightowl

    nightowl New Member

    Checking the loop water with a temp probe in the line in and line out ports are opposite what it says on the stat.
    Thermostat says:
    "entering water 33"
    "leaving water 37"
    Checking at ports with probe thermometer it is
    water in 37
    water out 33
  4. Mark Custis

    Mark Custis Not soon. Industry Professional Forum Leader

    I am a big fan of KISS controls and analog instrumentation and measurements. I live in Ohio always have always will.

    Why are you lowering the set point? A heat pump system needs to be set and forgotten.

    Run time as urthbouy notes is not an issue.
  5. nightowl

    nightowl New Member

    I start out with it set at 70 in the fall and lower it as it gets colder. I don't turn it back up unless we get a warm up. It is at 67 now and will stay there. I just fired up the wood burner so it won't run much now.
    I was more curious about the line out and line in loop temps being opposite on the stat compared to a actual reading with a thermometer.
  6. Mark Custis

    Mark Custis Not soon. Industry Professional Forum Leader

    Switch the sensors and see what happens.

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