Ground Source Heat Pumps

DeeWestern

Is there a risk this makes my house cold?

lovesgshp

should make little difference

lovesgshp

Let me put it another way.
If it is 20C outside, then why should you need a heat setting of 25C on the pump?
You are lucky that at least your heat pump is working after a fashion. Here, the earthquake, apart from causing some major damage to the house, knocked out the circuit board and the compressor, so at the moment we have purely the electrical backup on, so nearly 1500 hrs extra at 6kwh.

DeeWestern

Oh dear! I can always do you a good deal on a nearly-perfect system that has some attention from a great engineer

Have made the changes.

DeeWestern

Alarming again with a high HTF delta.

GT1 33.9 / 31.6
GT2 9.0
GT3 47.9 / 48.0
GT6 77.2
GT8 49.3
GT9 32.3
GT10 3.1
GT11 0.1

lovesgshp

Change 6.5 to 5.5 for the moment you can revert back if required.
You must recheck the filter, as everything else seems ok at the moment.
Did you get a circuit plan for the installation?

DeeWestern

lovesgshp wrote: »

Change 6.5 to 5.5 for the moment you can revert back if required. Done that. got an alarm whilst it was doing hot water which seems a bit surprising (61.5 / 46.0 GT8/9)
You must recheck the filter, as everything else seems ok at the moment.Will be a while before I can do this, but will get on the case - doubtful this is the cause as it was super clean when I checked in March, and alarmed constantly throughout
Did you get a circuit plan for the installation?Ha ha ha ha. I'm lucky I was able to get a manual off the internet!

It seems the alarm goes off as the water temperature drops too much between the time the heating water is sent out of the boiler, and the time it gets back - have I understood this correctly? The manual suggests a 10 degree drop is OK, so I'm not too far off. Could it be the house is just too big for the system? I thought this was an over-specced installation (due to the UK government incentives).

lovesgshp

The delta between gt8/9 should be around what you are saying 10C. With the buffer tank, that should allow the dual system temperatures to remain stable as that feeds to the circuits as required.
Please let me know the balance of the 1.1 to 1.14 readings.
Pity I am not nearer as it is much better to be in front of the unit.
Just wondering if there is another valve fitted in the circuit somewhere that is causing the problem. Shame you do not have the plan of the installation, as that may have helped.
What heated sqm have you?

DeeWestern

It's about 2300 sq feet in total.

1.1 5.5
1.2 0.0
1.3 - as above
1.4 5.0
1.14 18.0

DeeWestern

If there's a buffer tank, I wouldn't have thought that anything that happened 'downstream' of this (i.e. radiators or UFH or DHW) would affect the heat transfer fluid - but this is obviously just based on a gut expectation. If it did affect it, I would have thought closing off some radiators would make the return water warmer.