Inverter Air Con.

[Anthony5]

As it says in the link you post Some experts argue, some can argue about everything but I doubt that if it should be 55 degF that it will be double or half that figure if the move the thermometer a bit. I know that my 12000 Btu Daikin inverter units blow 7 degree Celsius in front of the outlet of the indoor unit

this temperature depends on the prevailing room temperature and can vary a lot. no 12k unit has an outlet airflow of 7ºC when switched on in a room which warmed up to 28 or 30ºC.

Will you agree and offer apologies if I take the test and post a picture of the thermometer?

If I don't get the 7°C or thereabout I will offer the same.

Don't know about Naam, but I'll take the bet. I don't think so.

Take a look at the post above yours, you lost already, please send the prize by EMS.

[bankruatsteve]

OK. Well done. But where are those leads next to? I claim foul if you put them next to the pipes.

Can't say I have measured all my A/C's over time, but when I have done it recently, the output air temp is 18C.

Cheers

[Anthony5]

OK. Well done. But where are those leads next to? I claim foul if you put them next to the pipes.

Can't say I have measured all my A/C's over time, but when I have done it recently, the output air temp is 18C.

Cheers

You can see from the picture where the lead goes. It is in the middle of the unit and lays on top of the swing.

I can post also pictures of a similar unit in another room from a few years ago when the Daikin technical team was here, and at that time it would reach about 6°C but that was in October so the ambient temperature was a couple degrees lower. 18°C is definitely a faulty unit, as I got a new unit from Daikin that was only blowing 14 degree.

[Naam]

As it says in the link you post Some experts argue, some can argue about everything but I doubt that if it should be 55 degF that it will be double or half that figure if the move the thermometer a bit. I know that my 12000 Btu Daikin inverter units blow 7 degree Celsius in front of the outlet of the indoor unit

this temperature depends on the prevailing room temperature and can vary a lot. no 12k unit has an outlet airflow of 7ºC when switched on in a room which warmed up to 28 or 30ºC.

What is my prize Naam?

your prize is zero till you publish the size of the room.

[Pib]

The method shown my Anthony5 using a digital thermometer with an external wire temp probe is an excellent way to perform some diagnostics on your A/C. You can pick these digital indoor/outdoor thermometers up is lots of places for just a couple hundred baht. Best to do the these during the heat of the day when its under high heat load when you are most likely to notice a poor performing A/C....at night the A/C has an easier job of cooling. Put the temp probe just inside the vent like shown in the pictures above but be extra careful not so far to where the spinning roller fan eats the probe. Now you have the probe only a few inches from the output of the evaporator cooling fins. After about 5-15 minutes the vent temp should be "around/below" 55F/13C...now your room will probably not have reached your desired temp yet, but your A/C is working hard to achieve it.

After 20 or more minutes you may be down around or maybe lower than 50F/10C...various factors such as A/C BTU size, room size, heat load of your room, etc., will affect this. And the lower you have the fan speed set the lower the temp will be (e.g., Low, Medium, High)...if set to Low speed it takes just a little longer to pull the air through the cooling fins which allows the air to be cooled more....set on High speed and it will be a little higher in temp because the air has less time to be cooled while being pulled through the cooling fins. You probably should do the test will the fan speed set to medium.

And as FYI, usually when you set an A/C to "Dry" mode to lower the humidity a little more all it's really doing is lowering the fan speed to slow down the speed of air through the cooling fins which allows more condensation/water removal.

And keep your roller fan clean....that has a BIG effect on how much air is pulled through the evap cooling fins and pushed into your room....your A/C can have ice cold air right at the evap fins but if volume of air being blown into your room is degraded by a dirty roller fan and/or filters you will still be hot under the collar because not enough air is being circulated within the room to cool properly.

[Anthony5]

As it says in the link you post Some experts argue, some can argue about everything but I doubt that if it should be 55 degF that it will be double or half that figure if the move the thermometer a bit. I know that my 12000 Btu Daikin inverter units blow 7 degree Celsius in front of the outlet of the indoor unit

this temperature depends on the prevailing room temperature and can vary a lot. no 12k unit has an outlet airflow of 7ºC when switched on in a room which warmed up to 28 or 30ºC.

What is my prize Naam?

your prize is zero till you publish the size of the room.

I think you play unfair Naam, since you're changing the rules of the game. Your remark was no 12k unit has an outlet airflow of 7ºC when switched on in a room which warmed up to 28 or 30ºC.

No mention about room size, and I also don't know what the size of the room matters, since this is a case of switching the unit to full power. You will also notice from the picture details that the temperature was reached within 51 minutes.

But to answer your additional question, the room is 4.90m x 4.50m, and before you say I'm making up things I will include the floorplan. The room is the one top left, called master bedroom.

Edited May 24, 2015 by Anthony5

[Barin]

18K BTU is definitely more than big enough for a 7M x 5M room (and assuming a 3M height).

18,000 BTU is more than enough for 100 sq, meters.

There is something wrong there.

Do you mean that you still feel hot in your 35 sq. meters room?

For a 35 sq. meters room just 8,000 BTU is more than enough if you have good insulation.

[uwe_rayong]

18K BTU is definitely more than big enough for a 7M x 5M room (and assuming a 3M height).

18,000 BTU is more than enough for 100 sq, meters.

There is something wrong there.

Do you mean that you still feel hot in your 35 sq. meters room?

For a 35 sq. meters room just 8,000 BTU is more than enough if you have good insulation.

That must be some pretty outstanding insulation or your target temperature must be almost identical to the outside temperature.

Did you see the pictures Anthony posted ?

That was aprox. 22sqm room, the AC was running at 100% with a target temperature of 18°C ( I photoshoped the remote a little bit as the picture was to dark):

From 31.1°C to 28.5°C took almost one hour.

The thermometer was directly under the unit but probably not near the air outlet. I assume Anthony set the fan to the lowest setting to archive the coolest air outlet temperature possible.

What I like to know Anthony, was your unit running constantly for the 4 hours or did you turn it off in between.

I have a similar sized bedroom also with a Daikin Inverter, I always have to turn it on about 60 minutes before I go to bed.

My target temperature is about 24°C, when I got to bed and I set it to 26°C during the night.

I was always somewhat unhappy that I need to turn it on something like an hour before got to sleep, but when I see you test pictures it looks like your unit is even worse.

Or was it because you put the fan to the lowest setting?

[Anthony5]

18K BTU is definitely more than big enough for a 7M x 5M room (and assuming a 3M height).

18,000 BTU is more than enough for 100 sq, meters.

There is something wrong there.

Do you mean that you still feel hot in your 35 sq. meters room?

For a 35 sq. meters room just 8,000 BTU is more than enough if you have good insulation.

That must be some pretty outstanding insulation or your target temperature must be almost identical to the outside temperature.

Did you see the pictures Anthony posted ?

That was aprox. 22sqm room, the AC was running at 100% with a target temperature of 18°C ( I photoshoped the remote a little bit as the picture was to dark):

From 31.1°C to 28.5°C took almost one hour.

The thermometer was directly under the unit but probably not near the air outlet. I assume Anthony set the fan to the lowest setting to archive the coolest air outlet temperature possible.

What I like to know Anthony, was your unit running constantly for the 4 hours or did you turn it off in between.

I have a similar sized bedroom also with a Daikin Inverter, I always have to turn it on about 60 minutes before I go to bed.

My target temperature is about 24°C, when I got to bed and I set it to 26°C during the night.

I was always somewhat unhappy that I need to turn it on something like an hour before got to sleep, but when I see you test pictures it looks like your unit is even worse.

Or was it because you put the fan to the lowest setting?

I ran it only for about an hour to do the test, and pressed the "powerful" button, second green on the left, which switch to lowest temperature and auto speed fan.

Also during the test the thermometer was right under the indoor unit, as you can see from one of the pictures, so the temperature in the room was lower than what the thermometer shows.

Don't be confused with the picture with the remote, as I said already that is a picture from 2 years ago in another room, when the Daikin team came to fix that unit.

My normal setting is 26°C and the fan in night mode, so you can't even hear the fan.

I don't have a thermometer in my room, but in the other room which is 3.90 x 3.60 I use the same setting and have a thermometer at the far end of the room, which will be in the morning around 10am show a temperature between 25 and 26°C

[Naam]

18K BTU is definitely more than big enough for a 7M x 5M room (and assuming a 3M height).

18,000 BTU is more than enough for 100 sq, meters.

There is something wrong there.

Do you mean that you still feel hot in your 35 sq. meters room?

For a 35 sq. meters room just 8,000 BTU is more than enough if you have good insulation.

15k btu/h is also enough to cool 200m² from +22º to +20ºC when the outside temperature is +15ºC

[Naam]

As it says in the link you post Some experts argue, some can argue about everything but I doubt that if it should be 55 degF that it will be double or half that figure if the move the thermometer a bit[/size]. I know that my 12000 Btu Daikin inverter units blow 7 degree Celsius in front of the outlet of the indoor unit

this temperature depends on the prevailing room temperature and can vary a lot. no 12k unit has an outlet airflow of 7ºC when switched on in a room which warmed up to 28 or 30ºC.

What is my prize Naam?

I think you play unfair Naam, since you're changing the rules of the game. Your remark was no 12k unit has an outlet airflow of 7ºC when switched on in a room which warmed up to 28 or 30ºC.

No mention about room size, and I also don't know what the size of the room matters, since this is a case of switching the unit to full power. You will also notice from the picture details that the temperature was reached within 51 minutes.

But to answer your additional question, the room is 4.90m x 4.50m, and before you say I'm making up things I will include the floorplan. The room is the one top left, called master bedroom.

Floorplan.jpg

collect your prize Anthony. i am totally dumbfounded and flabbergasted by your measured +7ºC

test yesterday:

-Daikin 12/13k btu/h, conventional compressor, 9 years old

-room temperature 26º

-ambient temperature 31.6º

-fan speed 3 (out of 6), temp 5cm from outlet 13.3º

-fan speed 2, temp 12.6º

-fan speed 1, temp 11.8º

[Sydebolle]

This should do the trick ......... and by own experience a 13'000 BTU a/c for a room of your size with proper (not special) insulation is working fine for us - for years

http://www.calculator.net/btu-calculator.html?roomwidth=7&roomwidthunit=meters&roomlength=5&roomlengthunit=meters&ceilingheight=3&ceilingheightunit=meters&insulation=normal&temperature=10&temperatureunit=c&calctype=heat&x=0&y=0

[shaurene]

18K BTU is definitely more than big enough for a 7M x 5M room (and assuming a 3M height).

18,000 BTU is more than enough for 100 sq, meters.

There is something wrong there.

Do you mean that you still feel hot in your 35 sq. meters room?

For a 35 sq. meters room just 8,000 BTU is more than enough if you have good insulation.

Sorry Barin that is rubbish never in a million years is 18,000btu more than enough for 100 sqr mts. Rule of thumb in wester country is 7-8 sqr mts per 1 kW. In hot country's like Thailand you need to work on 5 sqr mts per kW. 18,000 btu in western country is fine for 35 sqr mts but not enough for Thailand.

[Anthony5]

I think you play unfair Naam, since you're changing the rules of the game. Your remark was no 12k unit has an outlet airflow of 7ºC when switched on in a room which warmed up to 28 or 30ºC.

No mention about room size, and I also don't know what the size of the room matters, since this is a case of switching the unit to full power. You will also notice from the picture details that the temperature was reached within 51 minutes.

But to answer your additional question, the room is 4.90m x 4.50m, and before you say I'm making up things I will include the floorplan. The room is the one top left, called master bedroom.

Floorplan.jpg

collect your prize Anthony. i am totally dumbfounded and flabbergasted by your measured +7ºC

test yesterday:

-Daikin 12/13k btu/h, conventional compressor, 9 years old

-room temperature 26º

-ambient temperature 31.6º

-fan speed 3 (out of 6), temp 5cm from outlet 13.3º

-fan speed 2, temp 12.6º

-fan speed 1, temp 11.8º

I'll tell you the trick if you double the prize Naam. .....Hey you haven't named the prize yet, or can I just make my choice?

You keep the sensor 5 cm from the outlet, while I hang it inside the outlet, and which makes a big difference.

With my test I had the sensor in front of the outlet and would get to 10.5 °C, so when I hung it over the swing flaps the temperature would decrease to 7.5 °C within 2 minutes.

Where shall I send my prize suggestion?

[Naam]

This should do the trick ......... and by own experience a 13'000 BTU a/c for a room of your size with proper (not special) insulation is working fine for us - for years

http://www.calculator.net/btu-calculator.html?roomwidth=7&roomwidthunit=meters&roomlength=5&roomlengthunit=meters&ceilingheight=3&ceilingheightunit=meters&insulation=normal&temperature=10&temperatureunit=c&calctype=heat&x=0&y=0

what is the definition respectively the achieved temperature of "working fine"?

[Anthony5]

This should do the trick ......... and by own experience a 13'000 BTU a/c for a room of your size with proper (not special) insulation is working fine for us - for years

http://www.calculator.net/btu-calculator.html?roomwidth=7&roomwidthunit=meters&roomlength=5&roomlengthunit=meters&ceilingheight=3&ceilingheightunit=meters&insulation=normal&temperature=10&temperatureunit=c&calctype=heat&x=0&y=0

I'm not sure if using a North America based calculator, which doesn't take in account windows, doors, room position, insulation or whatever will do the trick in Thailand.

By the way, your aircon is over sized since you should need only 8.292 Btu.

[Naam]

I think you play unfair Naam, since you're changing the rules of the game. Your remark was no 12k unit has an outlet airflow of 7ºC when switched on in a room which warmed up to 28 or 30ºC.

No mention about room size, and I also don't know what the size of the room matters, since this is a case of switching the unit to full power. You will also notice from the picture details that the temperature was reached within 51 minutes.

But to answer your additional question, the room is 4.90m x 4.50m, and before you say I'm making up things I will include the floorplan. The room is the one top left, called master bedroom.

Floorplan.jpg

collect your prize Anthony. i am totally dumbfounded and flabbergasted by your measured +7ºC

test yesterday:

-Daikin 12/13k btu/h, conventional compressor, 9 years old

-room temperature 26º

-ambient temperature 31.6º

-fan speed 3 (out of 6), temp 5cm from outlet 13.3º

-fan speed 2, temp 12.6º

-fan speed 1, temp 11.8º

I'll tell you the trick if you double the prize Naam. .....Hey you haven't named the prize yet, or can I just make my choice?

You keep the sensor 5 cm from the outlet, while I hang it inside the outlet, and which makes a big difference.

With my test I had the sensor in front of the outlet and would get to 10.5 °C, so when I hung it over the swing flaps the temperature would decrease to 7.5 °C within 2 minutes.

Where shall I send my prize suggestion?

the prize is fixed and won't be published because it's a secret prize and meant to be a "surprize"

[Naam]

18K BTU is definitely more than big enough for a 7M x 5M room (and assuming a 3M height).

18,000 BTU is more than enough for 100 sq, meters.

There is something wrong there.

Do you mean that you still feel hot in your 35 sq. meters room?

For a 35 sq. meters room just 8,000 BTU is more than enough if you have good insulation.

Sorry Barin that is rubbish never in a million years is 18,000btu more than enough for 100 sqr mts. Rule of thumb in wester country is 7-8 sqr mts per 1 kW. In hot country's like Thailand you need to work on 5 sqr mts per kW. 18,000 btu in western country is fine for 35 sqr mts but not enough for Thailand.

in Thailand even 5000 btu/h are enough to get a room temperature of 32º if the ambient temperature is 29ºC

[CGW]

By the way, my Toshiba is about 5 years old and rattles and hums quite annoyingly. How old is your Mitsu and how's the noise level? I'm thinking of getting the Mitsu SuperInverter 18K.

Less than one year old, though you cant hear the compressor running when in the bedroom, if you are outside can hear the compressor running, they are not as quite as I expected!

Furthermore, you say the unit is an inverter- can y confirm what is cycling off. The condenser fan motor or the compressor?

G

Compressor, have to go outside to listen!

Maybe take a remote from one of the other Mitsubishi A/Cs that is cooling properly, use that remote control to turn off the problem child A/C for a few seconds and the use that remote to turn it back on again. When turned on the mode settings in that remote will be transmitted to the A/C setting it to the mode which was allowing the other A/C to work/cool properly....maybe the problem child A/C will start working properly also.

Have installed new batteries and "reset" AC, will see if it makes a difference?

I need to buy a thermometer to check the temp coming out from unit, Mitsu "techs" did check it and show me, but don't remember what it was, certainly not 7c!

Cheers

[Anthony5]

By the way, my Toshiba is about 5 years old and rattles and hums quite annoyingly. How old is your Mitsu and how's the noise level? I'm thinking of getting the Mitsu SuperInverter 18K.

Less than one year old, though you cant hear the compressor running when in the bedroom, if you are outside can hear the compressor running, they are not as quite as I expected!

Furthermore, you say the unit is an inverter- can y confirm what is cycling off. The condenser fan motor or the compressor?

G

Compressor, have to go outside to listen!

Oh the OP thought that they made aircons from which you can't hear the compressor when standing below it?

Looks more that he wanted to save on the installation cost and now isn't happy with his purchase.

[CGW]

By the way, my Toshiba is about 5 years old and rattles and hums quite annoyingly. How old is your Mitsu and how's the noise level? I'm thinking of getting the Mitsu SuperInverter 18K.

Less than one year old, though you cant hear the compressor running when in the bedroom, if you are outside can hear the compressor running, they are not as quite as I expected!

Furthermore, you say the unit is an inverter- can y confirm what is cycling off. The condenser fan motor or the compressor?

G

Compressor, have to go outside to listen!

Oh the OP thought that they made aircons from which you can't hear the compressor when standing below it?

Looks more that he wanted to save on the installation cost and now isn't happy with his purchase.

The replies received have been helpful, which lets be honest a lot if time people want to show how clever they are and go off track and get personal for no reason.

Appears we have reached that point with this thread, why bother replying Antony5? why would make the assumption that I would think they made AC that is silent?

Save on installation? what on earth are you assuming with this statement? please dont ruin what was a helpful thread!

Thank you.

[Anthony5]

The replies received have been helpful, which lets be honest a lot if time people want to show how clever they are and go off track and get personal for no reason.

Appears we have reached that point with this thread, why bother replying Antony5? why would make the assumption that I would think they made AC that is silent?

Save on installation? what on earth are you assuming with this statement? please dont ruin what was a helpful thread!

Thank you.

You may have noticed that I have gone out of my way already to show how you can check if your aircon is functioning correctly, and so have others in this thread, but all response you have given so far is that the Technicians from the manufacturer are incompetent, and that that the problem is not because your unit is undersized.

You also have already a few times got your answer that the problem is the unit is undersized and therefor your evaporator freezes and gives the temperature sensor the signal that the room is cold enough, but you like to believe the people who say that with 18.000 Btu you can cool a 100m² room.

As for your saving on installation, I'm 100% sure that the salesman has told you on purchase that you needed a bigger unit, and the technicians have that confirmed to you again, but you thought that you knew better than those greedy idiots who only want to rip you off with an oversized unit.

So yeah, I'm out of here and you're on ignore from now on, but not after to have wished you SOM NAM NAH.

[CGW]

^ Thanks for all your input and help A5, much appreciated. I'm sure the AC problem will be resolved. I just hope you are able to come to terms with and resolve your own personal issues, best of luck.

[Crossy]

And with that I think it's time to draw this thread to a close.