How to best configure my Mitsubishi heat pump to work effectively?
Hi,
I've a Mitsubishi 14kWh Ecodan which has just been fitted ( commissioned at the end of last week).
We have the room stat (Mitsubishi) and FTC.
Our house is around 180m2 with a variety of ages of the house. (Some parts 1840, some early 00's - with varying and questionable insulation in some parts - though we're working on that).
Installers commissioned the system, but I would say in a way that is very reflective of a twice on/off a day system with a heat curve where the lowest flow temp is 25 deg c - even at an indoor temp of 20 dec c.
It's a Mitsubishi FTC controller - but it doesn't currently have energy monitoring ( annoying and hopefully to be resolved shortly).
The heat pump is cycling off and then throwing hot water through the rads - so I need to get a more even temp.
Installers set combo of curve and room stat - but the crazy heat up/ off cycle is still happening. So - how do I get this to stop happening?
I adjusted the curve, which has helped a bit in some parts of the day, but still getting lots of cycling.
I have the Mitsubishi app - but it's not very user friendly and I'm at a total loss to know what it's trying to tell me.
I've tried switching weather comp only on - but the system stayed at 18 overnight which was far too warm for comfort. (I think this is because the app is set at 18 - it seems to have overridden the controller and I don't know how to get that back...)
I know the set back needs to just be a couple of degrees but the commissioning engineer put the set back at 10 degrees and I KNOW that's not correct.
I tried following a reset the curve at 8 degrees from Heat Geek, the cycling is less, but still present.
I'm aware that this is not an easy ask, but I've no confidence that the installers will give me advice that works correctly for an ASHP as they seem quite determined to give me a set up that reflects my old boiler!
Help is much appreciated.
Posted by: @cheshirecatHi,
I've a Mitsubishi 14kWh Ecodan which has just been fitted ( commissioned at the end of last week).
We have the room stat (Mitsubishi) and FTC.
Our house is around 180m2 with a variety of ages of the house. (Some parts 1840, some early 00's - with varying and questionable insulation in some parts - though we're working on that).
Installers commissioned the system, but I would say in a way that is very reflective of a twice on/off a day system with a heat curve where the lowest flow temp is 25 deg c - even at an indoor temp of 20 dec c.
It's a Mitsubishi FTC controller - but it doesn't currently have energy monitoring ( annoying and hopefully to be resolved shortly).
The heat pump is cycling off and then throwing hot water through the rads - so I need to get a more even temp.
Installers set combo of curve and room stat - but the crazy heat up/ off cycle is still happening. So - how do I get this to stop happening?
I adjusted the curve, which has helped a bit in some parts of the day, but still getting lots of cycling.
I have the Mitsubishi app - but it's not very user friendly and I'm at a total loss to know what it's trying to tell me.
I've tried switching weather comp only on - but the system stayed at 18 overnight which was far too warm for comfort. (I think this is because the app is set at 18 - it seems to have overridden the controller and I don't know how to get that back...)
I know the set back needs to just be a couple of degrees but the commissioning engineer put the set back at 10 degrees and I KNOW that's not correct.
I tried following a reset the curve at 8 degrees from Heat Geek, the cycling is less, but still present.
I'm aware that this is not an easy ask, but I've no confidence that the installers will give me advice that works correctly for an ASHP as they seem quite determined to give me a set up that reflects my old boiler!
Help is much appreciated.
You could start by turning any thermostats up to 23C, then see if that has any effect upon the cycling.
By contrast - 13:00 for an hour is relatively stable. This is reflective of the period 10 am to 1pm. Cycling happened at 9:00 and 15:00
It would appear that the heat pump was heating the hot water cylinder, when the Flow Temperature went above 50C. Once the DHW was up to temperature it switched back to CH, and has gradually raised the Flow Temperature up to the present 40C.
I would suggest that you see if the Flow Temperature stabilises, and if the indoor air temperature remains constant.
When you say that you have a Mitsubishi 'room stat', do you know if it is actually a thermostat or a temperature sensor? Does it have a model number?
Thank you!
Just need to work out how to solve the app/ room stat overriding the controller now!
Posted by: @cheshirecatThank you!
Just need to work out how to solve the app/ room stat overriding the controller now!
Please explain what you mean?
Looking at the first graph, it would indicate that your heat pump is carrying out the hot water reheat cycle, which will be set in the schedule.
The second graph would appear to show that your heat pump is operating normally, without any obvious cycling, but is responding to the variation of the outdoor air temperature.
If that is the case then you may wish to reset the 'room stat' to its original setting.
They told me that any manual temp change would revert at the next programmed change.
It’s set to 17 during the day and 15 at night on the main controller/programmer.
I manually changed it to 18 in the app yesterday and it stayed at 18 all night although at 10pm it should have switched back to 15.
Posted by: @cheshirecatThey told me that any manual temp change would revert at the next programmed change.
It’s set to 17 during the day and 15 at night on the main controller/programmer.
I manually changed it to 18 in the app yesterday and it stayed at 18 all night although at 10pm it should have switched back to 15.
You will need to check the settings in the schedule. If you read through the manual it should explain how to do this, if not there will be a YouTube video I feel certain.
Who set the indoor temperature at 17C and 15C? It seems rather cold to me.
- 25 Forums
- 1,438 Topics
- 30.2 K Posts
- 35 Online
- 1,224 Members
Join Us!
Latest Posts
-
RE: Spacing for roof fixing bolts ?
There is another consideration...but alas this doesn't ...
By Transparent , 3 hours ago
-
RE: Air source heat pumps and noise
Yes, but when they go wrong things get really sticky. D...
By Majordennisbloodnok , 4 hours ago
-
RE: No-code, plug-and-play monitoring for your heat pump
...except that's not how probabilities work. The chan...
By Majordennisbloodnok , 5 hours ago
-
RE: Noise problems with newly installed Samsung 8kW ASHP
Hi, Bit of an update. I bought a decibel meter and moni...
By Lokisam , 5 hours ago
-
RE: ASHP sizing - value of Heat Transfer Coefficient
@bontwoody I might add that the control wiring indicate...
By Toodles , 5 hours ago
-
RE: Incorrect Billing of Customers with a Smart Meter
I have provided them with a link to this discussion and...
By KoRWraith , 6 hours ago
-
RE: Are You Getting the Most Out of Your Renewable Energy?
As I mentioned, there are going to be some follow-up ar...
By Majordennisbloodnok , 7 hours ago
-
RE: Tell us about your Solar (PV) setup
Now, I know that this may be a little simplistic and pe...
By Toodles , 21 hours ago
-
RE: Are Octopuses Slowing Consumer Adoption of Heat Pumps?
I find increasingly staggering that the MCS rules don't...
By JamesPa , 23 hours ago
-
-
RE: Save the Energy Save the World using Daikin Altherma 3 operation mode and schedules settings.
Hello Mevl, I won't be able to answer all your question...
By HCas , 1 day ago
-
I have been watching, with interest, the rebuild and re...
By iantelescope , 2 days ago
-
RE: Making best use of Agile with a battery and ASHP
On the subject of automating battery charging schedules...
By jamesw , 2 days ago
-
Safety update; RCBOs supplying inverters or storage batteries
BEAMA have issued a safety update (March 2024) regardin...
By Transparent , 2 days ago
-
RE: Home energy storage & battery register
Hanchu ESS - Home-ESS-LV9.4K (9.4kWh)
By IRMartini , 3 days ago
-
RE: Insulation of flow and return Heat Pump piping
@dr_dongle I saw a YouTube presentation from one of ins...
By Toodles , 3 days ago
-
RE: Jokes and fun posts about heat pumps and renewables
@editor Oh Mars, just as I was becoming interested … To...
By Toodles , 3 days ago
-
It is certainly possible, using a modbus connection. If...
By cathodeRay , 4 days ago
-
I did another reconnection/ reconfiguration session wit...
By Abernyte , 5 days ago
-
RE: Recommended ASHP installers in Hampshire
@benson After my initial enquiries with Octopus, we had...
By Toodles , 5 days ago
Heat Pump Humour
Latest Topics
-
Spacing for roof fixing bolts ?
By heat-pump-newbie 3 days ago
-
ASHP sizing - value of Heat Transfer Coefficient
By jamesw 3 days ago
-
Incorrect Billing of Customers with a Smart Meter
By KoRWraith 6 days ago
-
Home energy storage & battery register
By Mars 6 days ago
-
Meter Readings - What are theses meters telling me?
By Potatoman 7 days ago
-
Have Octopus Energy discovered a way to Narnia?
By Davesoa 1 week ago
-
Making best use of Agile with a battery and ASHP
By jamesw 1 week ago