Honestly, the first and most important step is to find the controller for the ASHP - do you know where this is?

Hi @dawnrg - welcome to the forums. @batalto is correct. You will need to find the control panel for our heat pump first – this will control everything your heat pump does. Once you have that, we can try to figure things out.

I've also just contacted Grant to see if they can help.

Hi Dawn,

Welcome to the forum. Don't apologise for a long post, the more information that you can provide the better.

Grant would appear to be 'really helpful'. 🤨 

If you can confirm that your heat pump is a HPID10R32 and that you have a manual, that would be a good start. Also see if you have the remote controller, as shown in section 7 of the manual.

@derek-m Hi Derek it is indeed this model. I downloaded all the manuals off Grants website including the full installation manual and user manual (which isn't very helpful) before we moved in to start getting to grips with the beast. I plucked up courage this morning and opened up the control box to find that the installer hadn't bothered to even set the time! 

Also thanks so so much to you all for coming to help me so soon. That's blown me away. ASHPs are a steep learning curve aren't they?! Dawn.

@dawnrg 

Hi Dawn,

If you look at the installers manual, section 8.2 Weather Compensation on page 39 and section 9.9 Weather Compensation on page 52.

You may be asking 'what is weather compensation'. In basic terms, it automatically varies the water flow temperature with variation of the ambient air temperature, and in doing so tries to ensure that the heat pump is operating at maximum efficiency.

Water flow temperature, is the temperature of the water flowing around your radiators and/or UFH, the water being heated by the ASHP. The hotter the water, the harder the heat pump has to work to produce it. So for maximum efficiency it is necessary to keep the water flow temperature as low as possible, but still meet the heat demand.

If you have the remote controller easily accessible, you will probably find that your installer has left your system set for a fixed water flow temperature, and told you to control the indoor air temperature using the thermostats. Whilst this approach will work, it is far from ideal. If you read section 8.2, and study figure 8.4 and table 8.5, it will identify the 'group' and 'code' of the parameters that need to be adjusted for weather compensation to be enabled and used. Then read section 9, which explains how to make adjustments. You will need to use installer level access to be able to set and adjust the weather compensation.

I'm afraid my wife is about to drag me out to dinner (among all those sick people), just because it is my birthday, so I suggest that you read through the instructions and familiarise yourself with the controls, and we can continue when I am safely back home. 😀 

@derek-m, have a terrific birthday dinner 🎂 🥳 

@dawnrg 

Hi Dawn,

I'm safely back from my ordeal, and I managed to limit my wife to two large glasses of Prosecco, otherwise she starts lusting after my body, AGAIN. 🙄

When time allows, if you would care to look at section 10.7 Display Monitor Function, and see if you can obtain the values of the parameters listed in table 10.3 Monitor display, it would be most useful. Take the readings whilst your ASHP is operating.

Posted by: @derek-m

@dawnrg 

Hi Dawn,

I'm safely back from my ordeal, and I managed to limit my wife to two large glasses of Prosecco, otherwise she starts lusting after my body, AGAIN. 🙄

When time allows, if you would care to look at section 10.7 Display Monitor Function, and see if you can obtain the values of the parameters listed in table 10.3 Monitor display, it would be most useful. Take the readings whilst your ASHP is operating.

TMI Derek 😮 🤣 

Oh, and Happy Birthday 🥂 

@dawnrg 

Hi Dawn,

The Grant controller is not very user friendly, so may take a little explaining.

It should be possible for you to lower the hot water temperature, but I would need a little more information to ensure that I provide the correct advice.

From what I can see reading through the manual, the only data that you can collect is as detailed in my previous message.

I'm afraid that you will not be able to produce pretty graphs, since the Grant heat pumps do not have the required facilities.

To be able to calculate the COP value, with any degree of accuracy, would require dedicated electricity meters along with a heat energy meter, which I don't think have been installed on your system.

To be able to provide the correct advice, it would be useful if you could supply information (manufacturer and model number) or closeup photo's of all the equipment in your system, controller, pumps, valves, buffer tank and all the equipment fitted to your hot water tank.

@dawnrg 

Hi Dawn,

The Grant controller is not very user friendly, so it may take a little explaining.

It should be possible for you to lower the hot water temperature, but I would need a little more information to ensure that I provide the correct advice.

From what I can see reading through the manual, the only data that you can collect is as detailed in my previous message.

I'm afraid that you will not be able to produce pretty graphs, since the Grant heat pumps do not appear to have the required facilities.

To be able to calculate the COP value, with any degree of accuracy, would require dedicated electricity meters along with a heat energy meter, which I don't think have been installed on your system.

To be able to provide the correct advice, it would be useful if you could supply information (manufacturer and model number) or closeup photo's of all the equipment in your system, controller, pumps, valves, buffer tank and all the equipment fitted to your hot water tank.

It would also be useful to know the floor area and any heat loss calculations.