LG Air Con FM25AH Outdoor Unit in defrost Mode

[AXNPictures]

For how long does the a/c run before entering in defrost mode ? And how cold should be outside to make it start auto defrost ?

[richardc1983]

@AXNPictures Depends on how long unit has been operating, the outside air temperature, heating demand (how hard the compressor has been working) etc etc. SO hard to say. On a day below 0C and high heating demand inside could be once an hour, on a day of say 5C it could be once every 4 hours but no visible frost on the unit just an oil return process.

[KadirTurcia]

LG's new system outdoor units feature a white fan. fan and compressor needs produces inverter systems and internal, external environment, the transfer rate according to the settings. Class A energy efficient air conditioning and outer environment according to 40% -15 up to have a performance in heating

[garryt]

hvguy,

Richard is absolutely correct. These can be anything up to 535% efficient depending on conditions. Do some research before posting - try googling it!!

[andywsm]

@hvguy:

You are absolutely wrong. It is a heat pump, so called because it is moving heat from one place to another, not burning energy to produce heat. The high efficiency is because you are taking heat from a "free source" - i.e. outside and moving it inside.

[hvguy]

However the unit burns about 2kw of electricity when running at full whack but outputs 7kw of heat. About 350% more efficient. Compare this to a 2kw electric heater that burns 2kw and outputs 2kw of heat this is only 100% efficient!

lol, what are you smoking... nothing can be more than 100% efficient... let alone 350 lol, you sir are funny

[richardc1983]

@hvguy @hvguy No LOL at you, you clearly need to do research before commenting... ever heard of "Coefficient of performance"... heat pumps are more than 100% efficient... you get more out than you are putting in....

Look it up on Wikipedia.

[hvguy]

@richardc1983 you can throw a fancy formula together and publish it all you want... but the law of physics never changes. Lets say you have a heater, mounted on the wall, 1 inch gap, it draws in cold air and quickly heats it then it rises out of the unit... thus drawing in more air, does this make it more efficient because it has no fan? no, however, using a fan and a pump along with electronics to move hot air around IS however less efficient because of the loss in mechanical parts

[Swipe650]

@hvguy In the case of a regular convector heater, you are using an electrical heated element (100% efficient) to generate heat i.e. 1KWh drawn from the mains results in 1KW out.

In a heat pump, the electricity used is to power the compressor and fan. The effect of moving refrigerant around the circuit (the transfer of heat from outside to inside) results in a higher output rate of heat e.g 3.KW than the amount of power drawn by the heat pump e.g 1KWh to generate it, thus a higher efficiency.

[hvguy]

@Swipe650 but to move that refrigerant it uses power.. and moving heat is measured in BTU's.... so your basically creating energy...

how about this: what would be the efficiency of a gravity fed siphon system.. 1/4 hose, 5 gallons, 3 ft off the ground with a 3ft hose...

[richardc1983]

@hvguy The outside air, although very cold, bears energy. In the case of air to water pump, i.e. water are heated using the outside air, the pump uses this energy to heat the water cycling in the pipes. The energy is renewable but electricity is used to “pump” it inside the house. The energy invested in the pumping can be considered as a commission, the electricity is used to utilize the energy in the air for actual heating.

[richardc1983]

@hvguy AS someone has just posted above:

@hvguy:

You are absolutely wrong. It is a heat pump, so called because it is moving heat from one place to another, not burning energy to produce heat. The high efficiency is because you are taking heat from a "free source" - i.e. outside and moving it inside.

You are totally wrong and need to do your investigations... Google it!

[andywsm]

@hvguy

You are absolutely wrong. It is a heat pump, so called because it is moving heat from one place to another, not burning energy to produce heat. The high efficiency is because you are taking heat from a "free source" - i.e. outside air and moving it inside.

[fedders4]

Why is the fan in that system white?

[richardc1983]

@fedders4 No Idea, I guess just designed that way.

[Jakeequa]

@fedders4 It is just the model of the outdoor unit. I like white better.

[mrjunior41]

heat pump is the same as a ac unit?but the difference is that you use the wasted heat that the compressor make for something usual ??? or it is different from a ac unit?

[richardc1983]

@mrjunior41

Yes your correct but in winter it runs in reverse so air conditioninig outside and heating inside.

[GrantLogan2]

@richardc1983 it does exactly what it says...it pumps heat from outside inside in the winter and theopposite in the summer

[richardc1983]

@GrantLogan2 Hi Grant, yes I know, were you meant to reply to me?

[maxonian23]

Wow, that's really fascinating. Tell me, do you know how much it is to buy a systme like yours?

[gamwam]

i lived in a flat that had one of these,. i think it was made by daikin,...it did a great job keeping the living room cool (it gets hot in the south east lol),.. and i used to use it in winter instead of the evil storage heaters as it was much cheaper to run,. nice instalation :)

[richardc1983]

Yeh apart from the actual piping etc, the installers did it on the cheap and finish of cabling and pipe runs wasnt that great!

Did you have the outdoor unit on the balcony?

[gamwam]

well yeah it was kind of mounted on a wall which was deviding my balcony from the neighbours,.it was really quiet in cooling mode,. .but noisier when heating,... and in very cold weather it used to gather icicles and create a small frozen puddle on the balcony under it,. i kind of miss it as all i have now is a shitty portable unit which is so noisey its been relegated to the cupboard under the stairs,. luckily ive moved to nottingham and its cooler here so havent needed it

[richardc1983]

Yeh my unit had a frozen puddle at the front of it when it was snowing last week, was like an ice rink!

[abekhoy]

RICHARD, How many compressor this outdoor unit?

[richardc1983]

There is one inverter compressor.

Older models used to have 2, one fixed speed and one inverter, this model has just one.

[richardc1983]

My units are 12000btu in cooling and 13000 in heating.

Whether you need as much as me or more than me I dont know you would have to do the load calculations but mine are oversided a bit to give me that extra power if I need it, i.e very hot or very cold. This also always quicker warm up times when it is cold as there is more output.

The Mr Slim range are for commercial use really, they are a lot more expensive than the other Mitis Range.

YOu should be looking at the M Series units.

[fedders4]

how much BTU Per indoor unit?

[richardc1983]

Yeh window units have heat pumps but they dont use inverter technology which is why they are noisy!

[fedders4]

ohhhh thanks for telling me i'm going to get a mitsubish electric mr slim do they have the inverter?

[fedders4]

do window units have heat pumps?

[richardc1983]

Hi !Pidd,

I cant comment really on these systems, I think what you end up with is a budget system and if anything goes wrong with it you will find it hard to get the parts as no one will supply the parts. You are best of paying that little bit more and having a guarantee etc.

Im sure they will be ok just dont expect major savings etc. They will be cheap.

However go for it but make sure you buy the next size up from what you require so that you have the xtra capactity if need be!

[iPidd]

Richard, have you seen the easy fit inverter systems? Any idea if they are any good?

[richardc1983]

Sam, who said there was a problem... the systems are used for heating central heating is expensive to run and when you live in rented accomodation and dont have any control over the central heating heating via fan heaters is very expensive.

Wow.. you have hot summers, the fact is your aclimatised to it. In UK we may get 2 hot days at a time then it goes cold again so we never aclimatise. Also factor in working nights and having to sleep in a bedroom that has large % traffic noise! THINK!!!

[sam19771977]

Whats this crap all about - somebody filming an a/c compressor! Wtf do you want a/c for in an English house!!! You must be mad - why don't you just get central heating! Where I live its 40 degrees in the summer and I manage without a/c so whats your problem!?

[richardc1983]

No there are two units connected to it, however you can connect upto 4 indoor units to the outdoor unit.

2 units for me however is enought to heat my entire ground floor flat.

At present with UK temps of 8C outside, only one unit is used as it is more than enough.

[gamwam]

that unit heat just one room?

[richardc1983]

I know especially for LG. The fan is also very powerful throwing air at high speed out the front!

[classifiedinfo]

Also very sleek looking.

[25HNA6]

Quiet!