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Gary
@gary
Member
Prominent Member
Joined: Feb 8, 2023
Last seen: Aug 13, 2025
Profile Activity
Topics: 2 / Replies: 348
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Reply
RE: Volumisers in Heat Pump Systems: Does Placement Matter?

My Mitsubishi does exactly the same as David's above, there wouldn't be enough volume of water/heat in the primary circuit alone to defrost the heat p...

8 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Newbie: utterly confused with my Mitsubishi Zubadan air source heat pump running on 55C set flow temperature

If you want to check what your pump speeds are set to here is the video, they can be set to 1-5 for heating and DHW as others have said 17L is low for...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant ASHP not reaching target temperatures

@hillswick if you engage more radiators then it will take longer for the flow and return temps to stabilise so the heat pump will run harder. what f...

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

@davidnolan22 Nice out of interest do you know how much power it pulls at that temp at 32C my 8.5KW unit pulls about 800W

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

@davidnolan22 good spot, that should probably be ideally removed not needed for a heat pump. Needs to be set so it doesn't do anything if possible. ...

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

@sandman1600 If you unscrew all of the actuators then the circuits will always be open regardless of what the thermostats are doing, then you just ...

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

@sandman1600 Control logic is either auto adapt, weather comp or fixed flow you want weather comp the graph symbol in the image below What is tell...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Grant ASHP not reaching target temperatures

You don't say what flow temperatures you are running at, are you using weather compensation or a fixed flow temperature? What are the flow and retur...

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

@sandman1600 What controller do you have there are good videos from mitsubishi on how to set weather compensation, I will assume you have an FTC7 cont...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: SolarPV tables / online calculator

8 months ago
Forum
Solar Photovoltaic (PV)
Reply
RE: -20c room temperature on Ecodan with P1 code

If you have a Mitsubishi wireless controller then it should be set to Room RC not Main RC, if you use Main RC it will now be using the main controller...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: -20c room temperature on Ecodan with P1 code

That is the target room temperature and if its showing -20C then its not getting a temperature signal from the thermistor. Are you using the main co...

8 months ago
Forum
Air Source Heat Pumps (ASHPs)
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