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Thread: Rheem Heat Pump

  1. #1

    Rheem Heat Pump

    We have just purchased a home that has a Rheem 10 Seer Classic Heat Pump M/N RBEH. We had never even heard of heat pumps until we moved to the east coast in Canada. We have our thermostat set to 70 degrees and when it comes on it puts out hot air until it reaches that temperature then it puts out cold air for 3 to 4 minutes then shuts off. So now the house cools down faster and the heat pump starts the cycle again. Are we doing something wrong? The thermostat is set to heat we just keep it on the daytime setting and the fan doesn't run all the time. Any suggestions?
    Bob

  2. #2
    Join Date
    Aug 2012
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    2,594
    It's designed to run for 30 or 60 seconds after cycle ends call a pro and have them adjust it for a shorter time if possible.

  3. #3
    Join Date
    Mar 2012
    Location
    West Chester, PA
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    511
    Heat pumps are known for low discharge air temperatures. It is a common complaint and it could simply be that you aren't used to that type of heat. There could be a blower delay at the end of the cycle that is keeping the fan on for about 90 seconds. This is common on air conditioning and the same control might be forcing a 90 second 'post purge' after the call for heat ends. You could have a technician install a separate relay for the hear side which negates any blower off delay that you might have but as long as the space temp is reaching the set point then you probably don;t have a problem. When the unit stays 2-3 away from set point and blows cold air when it is within 2-3 degrees, then you have a problem with the heat pump and it is simply that the aux heat is keeping you within 2 degrees. Also if you are setting back more than 2-3 degrees then you will be running heat pump and aux until you get within 2 degrees then aux drops out and you get heat pump only. This could be causing your cold blow

  4. #4
    [QUOTE=ADillon;14539991]Heat pumps are known for low discharge air temperatures. It is a common complaint and it could simply be that you aren't used to that type of heat. There could be a blower delay at the end of the cycle that is keeping the fan on for about 90 seconds. This is common on air conditioning and the same control might be forcing a 90 second 'post purge' after the call for heat ends. You could have a technician install a separate relay for the hear side which negates any blower off delay that you might have but as long as the space temp is reaching the set point then you probably don;t have a problem. When the unit stays 2-3 away from set point and blows cold air when it is within 2-3 degrees, then you have a problem with the heat pump and it is simply that the aux heat is keeping you within 2 degrees. Also if you are setting back more than 2-3 degrees then you will be running heat pump and aux until you get within 2 degrees then aux drops out and you get heat pump only. This could be causing your cold blow[/QUOTE

    I am very new at this heat pump thing so pardon my lack of knowledge. So when the temp. in the house gets cooler than the 70 it is set at, the heat pump turns on then when it reaches the set temp. or above the set temp. it then blows cold air to keep the house at that 70 degrees. It seems like the heat pump is on constantly because it cools it down so fast. And the cold air runs for 3 minutes or so and the house seems cold all the time.

  5. #5
    Join Date
    Aug 2012
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    2,594
    Quote Originally Posted by ADillon View Post
    Heat pumps are known for low discharge air temperatures. It is a common complaint and it could simply be that you aren't used to that type of heat. There could be a blower delay at the end of the cycle that is keeping the fan on for about 90 seconds. This is common on air conditioning and the same control might be forcing a 90 second 'post purge' after the call for heat ends. You could have a technician install a separate relay for the hear side which negates any blower off delay that you might have but as long as the space temp is reaching the set point then you probably don;t have a problem. When the unit stays 2-3 away from set point and blows cold air when it is within 2-3 degrees, then you have a problem with the heat pump and it is simply that the aux heat is keeping you within 2 degrees. Also if you are setting back more than 2-3 degrees then you will be running heat pump and aux until you get within 2 degrees then aux drops out and you get heat pump only. This could be causing your cold blow
    This is an excellent explanation
    Home owner if you cannot be helped by this it is time to call the pros. In other words get your unit "tuned up".
    Heat pumps are much more complicated than straight heat and air and the same logic does not apply to the end user.

  6. #6
    Join Date
    Jan 2004
    Location
    Lancaster PA
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    67,770
    Quote Originally Posted by diannemburgess View Post
    We have just purchased a home that has a Rheem 10 Seer Classic Heat Pump M/N RBEH. We had never even heard of heat pumps until we moved to the east coast in Canada. We have our thermostat set to 70 degrees and when it comes on it puts out hot air until it reaches that temperature then it puts out cold air for 3 to 4 minutes then shuts off. So now the house cools down faster and the heat pump starts the cycle again. Are we doing something wrong? The thermostat is set to heat we just keep it on the daytime setting and the fan doesn't run all the time. Any suggestions?
    Bob
    I think you have a control sticking. call a local service company.
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    How many times must one fix something before it is fixed?

  7. #7
    Join Date
    Feb 2009
    Location
    Tallahassee, FL
    Posts
    6,018
    A heat pump has 2 sources of heat. One way is with the same parts that cool your house in summer. The outdoor unit will switch gears and absorb heat from the cold outdoor air and deliver it to you. The amount if heat you get is directly proportional to the temp outside. At 20 or below the air temp coming out may be as low as 80. Lower than our body temp however it is still adding heat.

    This is the most efficient source of heat.

    The 2nd source of heat is just electric heat strips. They come on anytime you raise thermostat 2-3 deg warmer. These consume lots of energy but the air coming out is considerably warm and is not dependent on outdoor temps.

    One last function is called a defrost cycle.

    As the outdoor unit builds ice on its coil absorbing the heat it will need to periodically melt that away.

    It will shut off the outdoor fan and switch to cooling mode. The heat strips should now energize to keep air from being cold.

    Now heat from inside is used to melt the ice.

    Once ice clears fan comes back - unit shifts back to heat (whoosh sound) and strips may turn back off.

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