Outdoor reset sensor can help your

heat pump work better.

    An outdoor reset added to your thermostat can help your heat pump work better by adjusting the temperature of your house with the outside temperature.
     This feature can be added to the Honeywell Y594 Thermostat. It is easy if your thermostat only has a heat function since some of these thermostats will have a heat thermostat on the left and a cool on the right.
    The thermistor costs about $10 and  the heater is a 1K ohm resistor. With a little skill it can be added to your existing Y594 for about $1.
 For more information please contact us.

Image of the honeywell C815A outdoor reset thermistor resistance curve. Notice the the "knee" of the curve is about 40 degrees F at 1000 ohms.

  1. Blower: usually a squirrel cage centrifugal air moving device. Will move large volumes of air relatively quiet. Will use less energy with more back pressure.
  2. Fan: a paddle type air moving device used where noise is not a major consideration. Will use more energy with more back pressure.
  3. Combustion blower: A blower used on high efficiency furnaces or oil burners to move combustion air. usually 1/20 to 1/6  horsepower.
  4. OEM: Original equipment manufacturer.
  5. Horsepower: 746 watts
  6. KW Kilowatt (1000 watts) or 3400 BTUs per hour
  7. RPM: revolutions per minute.
  8. Service factor: the extent to which a motor can be safely overloaded beyond its name plate ratting without over heating.
  9. Air over horsepower: The rating of a motor assuming air flow through the windings usually as a result of the air moving device.
  10. SAE: Society of Automotive Engineers.
  11. Ton 12,000 BTUs per hour of heating or cooling
    This page will be updated soon
 Good Luck Scott
If your heat pump forms ice outside in the heat mode click here.
If your air conditioner or heat pump ices up in the cooling mode click here.
If you have water leaking problems with your air conditioner  click here to solve it.
To identify your gas furnace parts click here.
For other heat pump problems click here.
For other heating system problems click here.
 Any other questions feel free to contact us by any of the means below. good luck Scott.
    If you were looking for Ice Machine repairs click here.
If you are looking for solar energy click here.

Written By:  Scott Meenen N3SJH of:
Specializing in Mechanical, Controls and Electrical Modifications Of
Heating, Air-conditioning, Refrigeration, Cold storage,
Ice Production and Food preservation. Anything having to do with Heat and Energy.
Serving MD, DC, and Northern VA.
Contact us by pager: 1-877-467-2914

Email us at: jsmeenen@toad.net

                 This text written by: Scott Meenen * G & S Mechanical

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