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davidnolan22
@davidnolan22
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Joined: Jan 15, 2025
Last seen: Nov 29, 2025
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Topics: 0 / Replies: 134
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

Yeah, it’s all very complicated. My installer has put over 1000 Ecodans, so I’m leaving it to them. Both they and the mitshi engineer said my secondar...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

Did you self install it?? Why not get installer involved

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

@gary i'm not sure what it will do, but Mitshubishi engineer said the 11.2 ecodan needs to have the secondary flows closed during defrost. I was / ...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

@harriup Hi, just picking this up again. My installer has been out and the flows are going through the UFH slab and rad circuit on defrost when they...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Vaillant Arotherm ASHP gets noisier when it gets colder outside

@tallmarc it's exactly the same with the mitsubishi ecodan. i actually got their engineer out who just stated the figures in the brochure were lab and...

10 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

thanks for that reply I've had the pump speed on max and it's seems a bit worse, can't be sure yet, as the compressor ramps up even harder and defro...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

@gary yeah, mine is just a pipe with no volume with the system pipes coming off it, but its not part of the pre plumbed cylinder

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

@jamespa all good questions..... Look like I have a weekend sat in the loft again. the wife will be chuffed. Anyhow, installer coming left week....

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

i'd need to check. i'm not sure when the temp sensors are for the display i see in mel cloud. i assume they are the ASHP side of the header. the temp...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

@jamespa no buffer, no volumiser, piped 35mm Low loss header with one feed off to 2 UFH manifolds, and 1 rad run. Total system volume I have worke...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

@jamespa Hi James, all good questions. 1) no noise restrictions, but I will double check 2) yep, everything is fully open 3) yeah, sup...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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RE: Mitsubishi Ecodan 8.5kW Monobloc (FTC5) Defrost Mode

@gary Hi, my graph looks the same, but defrosts every 30 mins, takes 15 mins to recover the temp that's not high enough, then defrosts again. The hous...

11 months ago
Forum
Air Source Heat Pumps (ASHPs)
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