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RobS
@robs
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Estimable Member
Joined: Oct 15, 2024
Last seen: Nov 23, 2025
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Topics: 0 / Replies: 57
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RE: Performance of Heat Pumps in Mild Weather

@heatgeek I'm going to try to answer all your questions, just maybe not in the order you asked them - I think it'll make more sense this way. Firs...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

@heatgeek Happy to answer questions about our 8kW Mitsubishi. Yes, it's able to run at ~2.0kW output for extend periods with a dT of ~2C and a COP ...

7 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

@heatgeek @jamespa I hope this may help with the modulation discussion. Comparing the Hitachi 2.5 HP to the Mitsubishi R290 6kW (just one compresso...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Ecodan 11.2kw Wireless thermostat drop outs

@skyecraig I've had our FTC7 wireless thermostat lose connection to the controller a few times, does yours display 3 in the top right where the temp...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

@trebor12345 I'm pretty sure Viessmann use an energy integral algorithm like Vaillant, so what we are seeing is that at a near constant outside temp...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

@heatgeak It's good to talk about mild temperatures and heat pumps, they don't get discussed very often. It's a 8kW unit. It does prove that ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Performance of Heat Pumps in Mild Weather

As both Vaillants do DHW but the Samsung doesn't, you'd expect the daily mean COP of the Vaillants to be less. Also the first Vaillant does a defrost ...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: What happens when the outside temperature exceeds the upper WC point?

@gary We've got the FTC7, maybe older controllers didn't have that setting? It's under Operational Settings on the FTC7.

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: What happens when the outside temperature exceeds the upper WC point?

See my post- it's called summer mode and is in the service menu.

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: What happens when the outside temperature exceeds the upper WC point?

Mitsubishi has a separate setting, like Samsung, to turn the heat pump off above an outside temperature. And turn the heat pump on below an outside te...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

It's from:/p> Suggest you use the menu (top right) and download the PDF - it's a big document as it has all of Mitsubishi's air to water heat pumps....

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

A few comments that might be helpful. As James mentioned, usually the biggest source of over estimating heat loss is the ventilation rate (air chan...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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