Why is this?
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Because only thing what is matter is is how comfortable you are, and on what efficiency that comfort is delivered. If you don't feel any difference in comfort with on-off system and that on-off system deliver heat more efficiently, than you could say that there is not necessary inverter system better than on-off system. Especially when its poor control nulls its gain in performance on other points.
From power consumption stand point, it doesn't matter if 2kWh are consumed in intervals or as steady or varying current draw.
It is same 2kWh of power consumed.
However, it is important at what COP is outdoor heat transfered to heated space.
Only real comparison in real life conditions could tell you if your inverter system is more efficient and comfortable than on-off system.
That real comparison is when you, in two identical places, put two different systems at identical conditions for one season and then compare total power consumption of each and feel of comfort.
I personally don't like feeling when indoor unit of inverter is at minimum.
From what I know, there is no such comparisons documented.
I found it fairly ambiguous and confusing.
In particular, the specs are for a dual compressor system. Having one compressor changes things.
As to the min/nominal/max ratings: No two systems are truly identical. I would assume that a number of systems were tested under tightly controlled conditions and some performed at min while others performed at max, the nominal rating being the average performance. Therefore, given the specified conditions, anywhere in that range should be considered normal... but then, this assumes a dual compressor system, for which we do not have the specs.
I would say that spec are for that particular AC, as you could see from model# on header of specifications.
Also, I would say that description of control logic is maybe not for this particular model and I would love to see this model service manual for that reason.
Regarding min/nominal/max ratings: Maximum rating is when compressor speed is highest at that particular temperatures of return air and outdoor air, and that is usually "120-130%" of nominal capacity. That speed compressor could hold only relatively short time period, when there is need for capacity high, like after power up.
Then, min rating is when compressor is on his last power step before shut down (and at same return and outdoor temperature as above) , and that is usually around 30-40% of nominal capacity.
Nominal capacity is "100%" capacity.
Gary page 210 of http://mylg.co.uk/data%20for%20site/...%20outdoor.pdf shows that the FM25AH UE3 has just the inverter compressor. My model is the UE1 version, which also has just the inverter compressor. Mine is the European Model however the specs book doesnt show the UE1 so I have been told to go by the UE3 specs which is the same as mine apart from a few cosmetic changes.
So gary the specs on page 218 are indeed for one inverter compressor. Can you eleborate on this now?
Ok so its never reaching the last step down it prefers to shut off totally so I thought that it wasnt reaching this because the outoor ambient wasnt high enough. I thought that the min, rated & max were based on a max for the highest comp output in very cold weather and the rated is what the indoor and outdoor temps were based on
Right guys, despite the problems and confusion above the outdoor temp ambient has been hovering at 0.2 and is now -0.5 now. I got in the flat at 3pm and the indoor temp was 10C!!! It was cold!
UPDATE:
Remote sensors arrived today, what a mess around trying to fit them as the plugs on the end that connects to the board are designed for cassette/ducted unit. SO had to take the plugs off and fit to the existing return air plug.
Have mounted them at 1.5mtr from the floor on a wall where warm air flow from the unit will not affect it.
Couple of things: The lounge sensor had to move several times as it appeared that the sensor was being affected by the temperature of the outside wall which is very cold to the touch, this was making the outdoor unit run at full speed However moving it so it wasnt touching an outside wall means that temperature control in this room is no longer an issue.
2nd point is on the bedroom unit... now seems to be the problem unit. Have mounted it on a non external wall however (but fitted on wall opposite the external wall) temperature control in this room is even worse now. Before warm air was cycling back to the unit and shutting off too soon but now the temperature is way overshooting the set point temperature. For instance set point of 19C the room temp reaches 22C before shutting off. If I try to compensate by putting down to 18C doesnt make any difference unit still seems to be a couple of degrees over. Tried connecting the old temp sensor to the end of the new long cable and same results. COuld the wire be damaged or something? I have measured temps with an accurate digital thermometer right next to the remote sensor, is it still sensing wall temperature despite not being on an external wall? I dont understand as the digital thermometer is small yet manages to pick up the air temp being 22C when 19C is wanted. I appreciate a 1C differential either side of set point but not 3C.
MODS: Any chance of moving this to the Main Air Con forum and out of Heat pumps as I feel will get more attention and if possible could post be renamed to LG Air Con Problem as I did not start the original post someone did it for me.
Thanking you all.
I think that it has been receiving enough attention not to need moving and as it is about a heat pump seems to be in the right place.
Sensors arrived,
After being quoted £40 by several distributers for each sensor I ended up dealing with LG comfort cooling who have been helpful from the start to finish they quoted £18 per sensor... much more reasonable!
After receiving these and arranging for them to be fitted, they didnt fit, wasnt just simple unplug existing sensor! had to remove the plug at the end and mess around with existing plug to get it fitted as the plug was too big on sensor. But then this didnt work so have had to just extend the existing sensor using the cable provided with the remote sensor. So I have paid for a posh box and cable for nothing really.
If you listened my advice than you will be now richer for that 36 pounds and you will be having hot home from day one of your posting! Don't forget, this is first response on your problem.;)
http://www.refrigeration-engineer.co...51&postcount=2
Sorry, but I just cannot resit to tell you "I told you so!". :D:D
Yes nike but I paid £18 per sensor from LG comfort cooling not the quoted £40 from other installers.
So I have done ok. An electrician would have charged same ammount. Plus electrician would have had to mess with the control board to get it wired in.
Sensors now put 1.5metres above floor level.