Weather Compensation Cost not efficiency?
Posted by: @jeegneshso this is on Valiant aroTHERM and my settings has the the room temp mod now set to inactive, so essentially no thermostat, hence my question what the timer is for
The timer is for if you are in expanded mode the wc is modified by switching off the heating if it’s too warm. You can have a set-back temp overnight or other period with a lower temperature for a certain time.
The other mode is active which is wc plus aiming to a set temperature (ie like ‘normal’) and that is for certain times.
2kW + Growatt & 4kW +Sunnyboy PV on south-facing roof Solar thermal. 9.5kWh Givenergy battery with AC3. MVHR. Vaillant 7kW ASHP (very pleased with it) open system operating on WC
If I am in inactive mode, then how or when does setback kick in?
Timer mode lets you specify a time and a temperature but as inactive the temperature for sure has no input.
13.6kw Solar, 27kw Battery, 10kw Heat Pump and EV Car
@jeegnesh Doesn’t matter which room temp mod mode you’re using; the following behaviour happens:
During scheduled ‘heating’ periods, the heat pump targets your chosen set point temp.
During scheduled ‘off’ periods, it targets your chosen setback temp.
So this is it, what is my chosen set point, how does it get that? Considering the Room Temp Mod explanation and mine is set to Inactive.
-
InactiveThe thermostat is only a display, and the heating circuit is not being used
-
ActiveThe thermostat adjusts the flow temperature based on the difference between the room temperature and the indoor target. For example, if the room needs more heat, the system will increase the flow temperature.
-
ExpandedThe thermostat acts as an on/off switch for the heating, turning it off if the room temperature is exceeded. The system control also regulates to the target room temperature, regardless of the outdoor temperature.
13.6kw Solar, 27kw Battery, 10kw Heat Pump and EV Car
@jeegnesh Your chosen set point temp is the desired indoor temperature that you choose via your SensoCOMFORT controller and myVaillant app.
If you’re finding that your house doesn’t drop in temp enough to hit your chosen setback temp during the scheduled ‘off’ period, then this means that either your weather comp curve needs tweaking, and/or you should select a lower setback temp.
@ectoplasmosis so it constantly breaches that number and turns on.
I do know if I switch to expanded then it adheres to that temperature. So I guess I am asking what inactive does
13.6kw Solar, 27kw Battery, 10kw Heat Pump and EV Car
@jeegnesh It’s all been explained to you already.
Inactive is pure weather compensation mode, where the only sensor which affects flow temperature and thus heat input into your house is the outdoor temp sensor. There is no longer a concept of an indoor thermostat.
If your system is overshooting your chosen set point temperature, then your weather compensation heat curve setting is set too high. Lower this setting, wait a couple of days and see how your house reacts. This is a process of trial and error, and takes time to end up with the perfect curve setting which suits your particular house.
Make sure any TRVs etc are fully open.
@ectoplasmosis perfect this now makes total sense to me.
13.6kw Solar, 27kw Battery, 10kw Heat Pump and EV Car
- 26 Forums
- 2,136 Topics
- 46.8 K Posts
- 27 Online
- 5,662 Members
Podcast Picks
Latest Posts
-
RE: Powerwall 3 or Myenergi or something else?
We have a Tesla Powerwall 3, recently installed, so I m...
By Old_Scientist , 29 minutes ago
-
@majordennisbloodnok The drying out of air shouldn't ha...
By dgclimatecontrol , 40 minutes ago
-
RE: Does anyone have experience of a smart water meter?
Thanks, @technogeek. So far as I can make out, whilst...
By Majordennisbloodnok , 21 hours ago
-
RE: Mitsubishi PAR-WT60R-E Wireless Controller installation
@morgan They have been paired once but it was thought b...
By DavidAlgarve , 23 hours ago
-
RE: Isolating the system for a planned power cut
A great many ground-mounted local substation transforme...
By Transparent , 23 hours ago
-
@bontwoody From what I’ve learned the hard way: 1) T...
By DREI , 2 days ago
-
RE: Heat Pump Servicing & Maintenance – Good Value or Rip-Off?
Having bit the bullet and paid £250 for a service, our ...
By Old_Scientist , 2 days ago
-
New heat pump heating system underperforming in Italy... Advice needed!
hi all, first post! I've just renovated a house in sout...
By robinlawrie , 2 days ago
-
RE: Anyone still weathering it out with Agile?
I went to Agile when I had solar installed July last ye...
By NJT , 3 days ago
-
RE: Mitsu Wireless Controller and MelCloud
Well it has now become obvious that the installation of...
By DavidAlgarve , 3 days ago
-
RE: Say hello and introduce yourself
Whilst you're busy installing services (pipes and wires...
By Transparent , 4 days ago
-
RE: New Vaillant aroTherm Plus in black - When will it come to the UK?
@editor I know it was formally announced at Ish the oth...
By PatrickVito , 5 days ago
-
@moman0311 welcome to the forums. I've received your em...
By Mars , 5 days ago
-
RE: Thermostat for Ideal Logic Air with 3 zone support
No harm at all in plumbing it as 3 zones, I would have ...
By JamesPa , 6 days ago
-
RE: ASHP heat output monitoring
@carlo I see there is a discussion in Facebook user gro...
By Tim441 , 6 days ago
-
RE: Flexi-Orb Heat Pump Scheme: A Game-Changer for the UK's Heat Pump Industry
MCS have set a potential trap in the new version of MCS...
By JamesPa , 1 week ago
-
RE: Who has a V2G EV installation
General comment on battery care... I guess if ev is on ...
By Tim441 , 1 week ago
-
@old_scientist like for like comparisons are almost imp...
By Tim441 , 1 week ago
-
RE: Who's your electricity provider and what's your tariff?
@old_scientist There is an option in the Tesla app that...
By Toodles , 1 week ago
-
RE: Octopus Cosy & Octopus EV + bidirectional smart tariff, together. What, eh?
@old_scientist me too. Just installed my new heat pump ...
By Eliuccio , 1 week ago