How to set heat pump temperature

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heat pump cycles per hour

Hello, Can someone explain to me what cycles per hours mean? I noticed that my system can be set for 2,3,4,5, or 6. Thanks for any help. Join Date Jan Location Ft. Originally Posted by rickytz What aircooled53 said. A setting of 3 is typically recommended. CPH isn't air changes per hour. At 3 CPH, you will have on off cycles. A on time and a off time makes 1 cycle. EG: First cycle,10 min on 10 min off, second cycle,10 min on 10 min off, third cycle,10 min on 10 min off; would be 3 CPH.

Cycles per hour

Contractor locator map How-to-apply-for-Professional How many times must one fix something before it is fixed? Thanks for the replys. Right now my ac system is set for 3 cycles per hour.

Is it ok for it to come on for close to ten minutes and then shutoff for 10 minutes? I was told that it should run closer to 20 minutes before it shuts off. I have been timing it for the past hour or so and i'm getting anywhere from minutes of off time and run times of about the same.

Is that ok? I just want to make sure the system isn't oversized for the house. I have it set for 76 degrees in the house.

Do all of these reading seem normal? I have a allegiance 14 AS 4 ton system cooling a sq ft house.Jan 4, BlogHome Comfort. The refrigerator turns off and on. The basement sump pump cycles. The clothes dryer runs until the clothes are dry and then turns off with a friendly melody letting you know that it has completed its job. If any of these machines did not cycle off as we expect, we would naturally think something is wrong.

So when the weather gets cold and your heat pump runs constantly, myths are born. Do not turn the heat pump off by switching to Em.

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Emergency Heat. So if heat pumps are so efficient, then why do they run all the time? Here is a blog from the past with more information on this. But what if my heat pump really is broke and running non-stop?

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How will I know if I need service? Here are some tips to keep you from calling for service every time it gets cold. But hold on! Not only does my heat pump run all day and all night, but when it does get cold outside, my home feels colder!

What about that Mr. Heat Pump Expert?! Great question. Meanwhile the heat pump has been running non-stop throughout this time to maximize the cheap heat. What should you do, suffer? The heat pump is very efficient so make it do its thing. Do not suffer and submit yourself to the old myth that heat pump homes are cold. One tip that is not a myth. If you do this frequently, you will be calling up the expensive heat to accommodate the fast blast of heat.

This will not hurt your heating system but it can raise your bill if you do this often. More questions? Call Precision Comfort Systems. Request Service Emergencies — Call Request Service Now! Precision Comfort Systems Inc. June 27, Using these energy calculators provides rough figures. You should use the results to get a rough estimate of the size and cost of your required system. To get more accurate information it is advised that you consult an accredited renewable energy supplier.

For information about how heat pumps work, see the Heat Pumps article this web site. The objective of using a heat pump calculator is to determine the size, cost and eventual cost savings of the heat pump system you will need based on your heating requirements. These calculators offer various variables and it is a good idea to try them all to get a good idea of what is involved in calculating heat pump requirements.

The list of terms below gives an explanation for the variables. Heat Pump Calculator 1. Heat Pump Calculator 2.

Btu is a unit of energy used to measure heating and cooling systems, as such, a heating or cooling system will have a Btu rating, e. This operating point considers a condition for an indoor temperature and humidity level and an outdoor temperature and humidity level at a given location.

It is generally used for determining the cooling efficiency. COP stands for — Coefficient of Performance. COP is expressed as:. Because the energy consumed will always generate an amount of heat, calculating the COP for heating and cooling is different, i. This difference has to do with the system setup, where a cooling system is usually designed to release heat generated from the energy consumed outside of the area to be cooled. This measurement is mainly for industrial purposes.

This measures the amount of heat actually delivered to a house compared to the amount of fuel that must be supplied to the furnace, e. It is generally used for determining the heating efficiency. Heat Pump Calculator.Thermostats with adjustable cycle rates are something any home owner can install to lower power cost and help an HVAC system last longer.

All thermostats have a set temperature that will turn on and off a heating and cooling system. It is also sometimes referred to as the cycle rate since it is the cycle that a unit such as an air conditioner turns off and on. When HVAC units are turned on and off constantly it takes a toll on the equipment leading to parts wearing out and needing to be replaced. A unit that cycles often can also lead to larger electric bills. Why is there Higher Electricity Cost? When an air conditioner first turns on is when it has the biggest power consumption.

This is the reason that short cycles can run up a power bill. For example, an air conditioner must pump refrigerant through a cooling system which takes more work at the start then it does after it has been running. Your current thermostat may be capable of changing the cycle rate which can be seen in its manual.

Adjustable Cycle Rate Differential Thermostats. It can be set from 1 degree too as much as 3 degrees in half-degree steps. It also has a 5-minute minimum compressor off-time which is great when power is interrupted as too not damage the compressor. So, how do we remove or turn-off the 1 degree differential to keep the temp at what i set, not something different from what i set? The thermostat that the installer provided is a honeywell T6pro programmable thermostat.

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The problem is that the furnace cycles on for 5 minutes and off for 15 minutes day and nite. The installer turned off the program which supposedly senses the room temperature change before it actually goes down. He says this cannot be changed. Any suggestions as to what would be a sutable replacement to use. Our old thermostat 12yrs old would be set at 70 degrees and fire u[p when temp dropped to 69 and run til it reached Any help would be appreciated.

Hope this helps. Differential 1 to3 F.

heat pump cycles per hour

I leave in Winston Salem NC — often very humid in the summer. Will the Fast cycle be better at lowering the RH than the other Cycles? No the faster cycle will not allow enough air to be dehumidified during the process.Thermodynamic heat pump cycles or refrigeration cycles are the conceptual and mathematical models for heat pumps and refrigerators. A heat pump is a mechanical system that allows for the transference of heat from one location the "source" at a lower temperature to another location the "sink" or "heat sink" at a higher temperature.

In either case, the operating principles are identical. According to the second law of thermodynamics heat cannot spontaneously flow from a colder location to a hotter area; work is required to achieve this. Similarly, a refrigerator moves heat from inside the cold icebox the heat source to the warmer room-temperature air of the kitchen the heat sink.

The operating principle of the refrigeration cycle was described mathematically by Sadi Carnot in as a heat engine. A heat pump can be thought of as a heat engine which is operating in reverse.

Heat pump and refrigeration cycles can be classified as vapor compressionvapor absorptiongas cycleor Stirling cycle types. The vapor-compression cycle is used in most household refrigerators as well as in many large commercial and industrial refrigeration systems. Figure 1 provides a schematic diagram of the components of a typical vapor-compression refrigeration system.

The thermodynamics of the cycle can be analysed on a diagram [4] [5] as shown in Figure 2. In this cycle, a circulating working fluid commonly called refrigerant such as Freon enters the compressor as a vapor. The vapor is compressed at constant entropy and exits the compressor superheated. The superheated vapor travels through the condenser which first cools and removes the superheat and then condenses the vapor into a liquid by removing additional heat at constant pressure and temperature.

The liquid refrigerant goes through the expansion valve also called a throttle valve where its pressure abruptly decreases, causing flash evaporation and auto-refrigeration of, typically, less than half of the liquid. That results in a mixture of liquid and vapor at a lower temperature and pressure.

The cold liquid-vapor mixture then travels through the evaporator coil or tubes and is completely vaporized by cooling the warm air from the space being refrigerated being blown by a fan across the evaporator coil or tubes. The resulting refrigerant vapor returns to the compressor inlet to complete the thermodynamic cycle. The above discussion is based on the ideal vapor-compression refrigeration cycle, and does not take into account real-world effects like frictional pressure drop in the system, slight thermodynamic irreversibility during the compression of the refrigerant vapor, or non-ideal gas behavior if any.

In the early years of the twentieth century, the vapor absorption cycle using water-ammonia systems was popular and widely used but, after the development of the vapor compression cycle, it lost much of its importance because of its low coefficient of performance about one fifth of that of the vapor compression cycle.The Wall.

Click here to Find a Contractor in your area. Here are the website rules, as well as some tips for using this forum. If you've found help here, check back in to let us know how everything worked out. It's a great way to thank those who helped you. Need to contact us? TeeDog Member Posts: 4. January in Gas Heating. I have a 5 yr old Honeywell Programmable Tstat that has a cycles per hour setting.

The manual leads me to believe that I should have it set at 4 for my gas furnace, however I notice that it cycles several times when its set to rise from 64 to 68 first thing in the morning, and it cycles a few times an hour throughout the day. Can I lower the cph until the room fluctuations are a problem, then bump it up one, or am I way off in my thinking? January Sure will make you colder. So we have controls and equipment that avoids satisfying the setting.

Why would my tstat cycle during a scheduled rise of 4 degrees? Why not stay on until the tstat is satisfied?

heat pump cycles per hour

I thought that forcing the furnace to come up to operating temp 3 or 4 times vs once would be more costly. Cycling: It's my understanding, and I probably misinterpreted it. But, the "cycles per hour" have to do with how many times per hour that the thermostat "checks" itself to see if it needs to come on. If you have high mass emitters like cast iron radiators, they usually are set to one cycpe per hour because they release heat for such a long time.

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High output, low emitting heaters like copper baseboard heat up quickly and cool down quickly. So the thermostat needs to "check" more often. I have setback thermostats. I hear the one near me click all the time, but it is always comfortable and the swing is never more than two degrees. If the setback starts, it just doesn't come on. Thats my understanding of ow it works too. I guess I dont see why this is advantageous over an anticipator or swing setting.

Heat pump and refrigeration cycle

Adjust the swing temp for comfort and let it come on when it needs to. Now I have to live with a preset swing temp and tell the Tstat how many times an hour it can check it.

If the swing temp is tight, as mine appears to be, then it will come on every time it checks Cycling: That's not my experience with mine. February Update I have been running the stat with the CPH set at I was a propane tech on RVs for 24 yrs and was always told, and it sure makes sense, that the least efficient part of the cycle is start up. Until the combustion chamber came up to a particular temp, the flame was not burning at peak efficiency.

As well, the heat exchanger had to rise to a set temp to activate the fan switch.The Wall. Click here to Find a Contractor in your area. Here are the website rules, as well as some tips for using this forum. If you've found help here, check back in to let us know how everything worked out. It's a great way to thank those who helped you. Need to contact us? Mike T. Provided the room temp setting has not changed, the thermostat will limit the number of calls for heat in an hour to the setting.

For example, with a setting of 1 cph suggested for steam, you will get one heat call in an hour. The length of that heat call will vary with the load on the system, e. One cycle per hour with a steam system helps ensure a good, long and efficient steam production cycle at the expense of less "tight" temperature regulation.

I would presume that the lower the number of cycles per hour the greater the overshoot allowed above the thermostat setting. The "brainier" thermostats likely start with an overshoot assumption and then measure the rate of temperature rise during a call for heat and the rate of temperature fall after the call ends. This is quite different than other electronic thermostats whose calls for heat are determined by a fixed deviation from the setpoint. The traditional mechanical thermostats with adjustable anticipation are similar to this sort of electronic but you must measure the current available through the t-stat to properly "zero" the anticipator.

Tom S. Member Posts: December Confused by the concept Can someone explain the concept of cycles per hour to me? I mean if my thermostat is set for 1 cycle per hour steamdoes that mean it will only cycle on once per hour even if there are two or three calls for heat in that hour?

Or if there are no calls for heat will it turn on once in that hour? Thanks in advance, Bill. ChasMan Member Posts: You would think you could infinately adjust it. Perhaps in their next version. I hate thermostats. Thanks, that helps me understand it. I will for curiousity's sake keep my eye on how it all works - my Honeywell Digital is set for 1 cph, but it seems anytime I walk up to it and decide to bump up the temp, it responds. Perhaps that act of manual override takes precedence over cph settings, or perhaps I'm just hitting it at the right time.

They offer automatic and inherently infinite adjustability. Also, most steam boiler have pressuretrols I know you dont like them.

If the 1 cph is long enough, it could cycle on the pressuretrol anyway, effectively giving you more than 1cph, correct? By the way, how does an outdoor reset work with steam? From what I understand with hot water, it adjusts the temp of the water. Can't really do that with steam though.