Ground Source Heat Pumps

matelodave

Have you tried bleeding them to get rid of any air in the system

JHen

Sorry, I should have mentioned that I have bleed them

matelodave

OK then have they been OK and are now not heating up as well as they used to or have they allways been cooler.

Was the system balanced and has there been any tweaking of the radiator valves. Have you got TRV's or zone controls

JHen

We have lived in the property for just over a year and the rads upstairs, especially the one furthest away which definitely is cooler, appear cooler than downstairs. It's the furthest away one that is the main issue as it heats my daughter's bedroom which is always cold. I'm not sure if its the fact that this room only has one rad for a large room and this is making the rad appear cooler. I suppose I should get a digital thermometer and test to be sure. The system is several years old. All rads have TVR's which are all fully open. Apart from some tweaking to the control panel, as advised on this forum, we have had nothing done to the system.

As usual the prompt replies on this forum are much appreciated :T

matelodave

If all the TRV are fully open then they aren't really doing their job. It sounds like the system needs balancing as all the heat is being dissipated in the down stairs before it can get upstairs.

Havre a read up on Google on how to balance the rads and then you can adjust the TRVs so that they can do their job of regulating he temperatures.

You should also bear in mind that the radiator temperature will be lower with a heatpump than they are with a conventional boiler, usually around 40-50 degrees rather than 60+ so the system is a lot slower to react.

You really need to understand how the system works as you need to adjust timers etc differently to a conventional boiler as rooms will take longer to heat up so the system has to be on longer and ideally not shut off, but turned down a bit.

What other controls have you got and how are they set. (timers, thermostats etc). What make is your system and how is it configured

Perhaps others with a similar set up could advise you - I've got a airsource heat pump but with underfloor heating in a bungalow but it still took a whole winter before I'd learnt how it should be adjusted to get the best out of it.

It never gets turned off but it's got programmable thermostats which just turn it down by 3 degrees over night and up again an hour before we get up. If it's turned down too much or off it can take nearly 2 days to re-heat the house at this time of the year.

beardymarrow

Yeah, agreed dave. My first port of call would be to turn down the rads downstairs on the trvs. If they are all fully open, then as you say they could be taking more than their fair share of the heat. See if that helps. If it does that suggests that the rads are out of balance. Balancing it would be a good idea. Balancing involves restricting the flow on some rads and opening up others so that all have the same temperature drop across them.

lovesgshp

Agree with the above comments re balancing the rads etc.
It would be useful to have the make and model of the unit and what settings/timers you have set.
You say that you tweeked the system, so what did you alter?

JHen

It's an IVT Reg0637W (?)
I had issues with electricity consumption previosly and change the following settings as advised (which appears to have worked)
"Ok I have set 1.11 to 5 from 0. As soon as I did this the Shower Head light came on.
Temp Inc from 3.1 to 4.0"

My current heating settings
Temp incr/decr 4.5
Temp fine tune 1.0
Room Temp 24.6
Heat RAD mode - heat pump only
Stop 37.1 - Present 30.3

I have UFH in the hall and kitchen and rads in the rest of the downstairs and upstairs. I am awaiting delivery of an Infrared Thermometer to double check the temps of the rads.

I must confess I'm not clear on most of the settings and must take some time to read up on it - is there and Idiots Guide to IVT Heat pumps?

lovesgshp

Hi.
Can you give me the the readings from GT1 to GT11 when the unit is in heating mode, ( not DHW)/
Just a quick look at the figures you gave, seems to show that temp inc/dec seems to be set at underfloor heating level and not for a combined system. It should be at least 5.
Room temp @ 24.6 is quite high.
Looks like you are using the pump on compressor only heating? Flow cutoff temp looks low, depending on outside temp.

JHen

GT1 33.2 30.2
GT2 7.9
GT3 47.0 46.5
GT4 28.7 30.3
GT5 24.6 24.4
GT6 70.2
GT7 there is no GT7
GT8 37.7
GT9 30.7
GT10 75.0
GT11 -1.8