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AllyFish
@allyfish
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Noble Member
Joined: Oct 31, 2022
Last seen: Aug 20, 2025
Profile Activity
Topics: 23 / Replies: 471
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RE: Crossed flow and return

There sure is, but it's not the most rewarding work going round sorting out other folks' cock-ups. If there's one thing I've learned on my domestic AS...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Crossed flow and return

The refrigerant side of the ASHP plate heat exchanger is a condenser, superheated refrigerant gas in at the top, lower pressure sub-cooled liquid out ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Is the Grant controller a thermostat?

@dodgyknee - yes, Grant controller is a CH and HW thermostat. Not a very user friendly one, and very complicated to work. It's capable, with features ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How to turn ASHP heating off!?

On the Grant system you can either turn the ASHP controller off, but that also turns off the timed hot water boost. Or turn the 3rd party thermostat o...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: ASHP hot water vs solar PV via diverter - tank average temperature

@iancalderbank Yup, tried that, but the tank maxes out at 55degC indicated on the cylinder. The immersion thermostat cuts in and it then cycles on tha...

2 years ago
Forum
Domestic Hot Water & Cylinders
Reply
RE: ASHP hot water vs solar PV via diverter - tank average temperature

@derek-m thanks. The immersion heater thermostat on Grant cylinders is pre-set to 65degC and it cycles on/off on that. However, the separate cylinder ...

2 years ago
Forum
Domestic Hot Water & Cylinders
Topic
ASHP hot water vs solar PV via diverter - tank average temperature
2 years ago
Forum
Domestic Hot Water & Cylinders
Replies: 8
Views: 1441
Reply
RE: ASHP + Diesel heater?

Much of the struggle with ASHPs in winter is the defrost method. ASHP Evaporator coils have very narrow fin pitch, 1 to 1.5mm. That gives a large surf...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Our Grant Aerona R32 13kW ASHP installation

You may need a mains pressure regulator on the cold water inlet to your house. The pre-plumb cylinder inlet manifold has a 3bar pressure relief valve ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Adding Solar Gain influence to Weather Compensation Curve

This is interesting @sunandair. The basic weather compensation, relying solely on instantaneous outdoor dry bulb temperature, is crude. I've wondered ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Adding Solar Gain influence to Weather Compensation Curve

This is interesting @sunandair. The basic weather compensation, relying solely on instantaneous outdoor dry bulb temperature, is crude. I've wondered ...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Our Grant Aerona R32 13kW ASHP installation

@marvinator80 it does this with my 10kW. Algorithm within the ASHP as it monitors air and return water temperature. It’ll turn the ASHP off for a leng...

2 years ago
Forum
Air Source Heat Pumps (ASHPs)
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