It reminds me of TerryE 's comment in his excellent posts about using the slab as a heat store posted in Boffins Corner. He mentioned that the low-wattage UFH circulation pump was over time fundamentally just another kWh of heat going into the slab. Similarly, if the heatpump is in the house then the losses from it contribute to the heating but detract from the cooling.
You don't need the command unit to get cooling to work, provided the cooling temperature has already been programmed into the unit. Changing the Carrier-based units from heating to cooling is just a matter of the way you wire up the 12 V dry contact controls, as shown on this diagram I drew up:. Is it that simple?
In both cases the temperature that the ASHP will run at depends on what's been programmed into it, either during manufacture or from the command unit, so without knowing the internally stored settings it's hard to be sure how cold the flow will be in cooling mode or how hot the flow will be in DHW mode. My guess is that the internal control board may be set to the default values in the command unit manual. I set ours up with a motorised valve in the buffer tank loop the buffer provides hot water preheat in our system.
This valve is normally open in heating mode, but closes when the ASHP is in cooling mode. There's a tank thermostat that can over-ride the cooling mode and switch the ASHP to heating mode, opening the valve to the buffer in the process, if need be, so hot water always has priority. The thing that makes it easy to understand is almost all heat pumps only ever heat hot water OR space heating, never both at the same time.
Mainly so it can operate at a lower temperature when space heating. Ours has a switched output for a motorised valve so you can use a different medium for cooling if you want to, e.
You need to be a member in order to leave a comment. Sign up for a new account in our community. It's easy! Already have an account? Sign in here. Recommended Posts. Triassic Posted July 15, Share this post Link to post Share on other sites. ProDave 5, Jeremy Harris 5, Posted October 1, Note that cop while cooling is not as high as when heating.
Dreadnaught Ed Davies Posted October 1, edited. Edited October 2, by Dreadnaught. If it helps here are the default values from my carrier unit. Posted May 23, Create an account or sign in to comment You need to be a member in order to leave a comment Create an account Sign up for a new account in our community.
Find out how much cavity wall insulation costs. The main cost of a heat pump is the upfront cost for buying and installing it. The pump will use a small amount of electricity, but the running costs are minimal. Exactly how much your heat pump costs to run depends on:. The payback time how long it takes to recoup the cost of the system in energy savings depends on:.
The Renewable Heat Incentive RHI gives payments to homes which install certain types of renewable heating to help offset the costs. Payments are made over seven years. It will close to new applications at the end of March Find out more about the Renewable Heat Incentive and how much you could earn. If you already have an efficient heating system, see more ways to save money on energy bills.
Air source heat pumps are usually positioned outdoors at the side or back of a property. They need plenty of space around them for air to circulate. Inside, you'll usually have a unit containing pumps and hot water. It's usually smaller than a standard boiler. They are less disruptive to install than ground source heat pumps, as they do not require any digging in your garden.
Check first whether you will need planning permission for an air source heat pump. If you live in a listed building, then you'll usually need the consent of your local authority. Also check that your installation will meet the building regulations in your area. Speak to your home insurance provider too to check if your policy will cover the changes to your heating system.
If you're getting an air source heat pump it's important to make sure that your home is well-insulated so that is can retain the heat. Underfloor heating or larger radiators are often installed alongside heat pumps to disperse the heat better. Your installer should tell you how to use the controls for your heat pump to help you use it most effectively.
You will probably need to heat your home for more hours but at a lower temperature. When your system is completed, you should get a Commissioning Certificate from the installer. You should also get an MCS installation certificate once the system has been registered the installer must do this within 10 days.
You'll need this to qualify for most funding schemes. If you're considering an air source heat pump, use Which? Trusted Traders to find a reliable heat pump installer. Air source heat pumps require little maintenance and can provide heating and hot water, but they aren't flawless systems. Here are some of the key advantages and disadvantages:. An air source heat pump system can help to lower your carbon footprint as it uses a renewable, natural source of heat — air.
How much CO2 you'll save depends on the fuel you are replacing. For example, the figure will be higher if you are replacing coal or an oil boiler rather than natural gas. A heat pump needs a power source, usually electricity, to power the heat pump, so there will still be some resulting CO2 emissions. To get the best from your heat pump, you'll need to know how to use it most effectively.
Often you'll need to set your heating to come on for longer than with a traditional system. Your installer should show you how to control your heat pump system. You should also have your heat pump serviced every two to three years. Check that any grills are free of leaves and debris on a regular basis and follow any other maintenance checks advised by your installer. Heat pumps must have an energy label on them.
It states how energy efficient the pump is on a scale from dark green most efficient to red least efficient. Since 26 September , all new heat pumps must be sold with an EU product label.
The installer should also produce a package label that displays the efficiency based on several different components in the heating system. All heat pumps certified by the Microgeneration Certification Scheme must be sold with a product label, and the installer must produce a package label. If your heat pump is not sold with a product label, it may not be eligible for the Renewable Heat Incentive.
Read more: tips on saving electricity and money. Find out how air source heat pumps work, how much they cost, and how much they could save you on your energy bills. SI Sarah Ingrams. In this article How does an air source heat pump work? What is an air source heat pump? Air-to-water heat pumps Air-to-air heat pumps How much does an air source heat pump cost? Air source heat pump installation Air source heat pump advantages and disadvantages Are air source heat pumps efficient? View more links.
Other options to generate your own heat include: ground source heat pumps solar PV panels for electricity solar water heating wood burning stoves. Figures courtesy of Energy Saving Trust website. Share on Facebook Share on Twitter Share by email.
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