different brand have different piping size one

1.0 hp copper pipe size 1/4" + 3/8"
copper piping 1/4" + 1/2" 1.5hp york, 1.5hp n 2.0hp for pana.
Copper piping 1/4" + 5/8", 2.0hp n 2.5 hp york, 2.5 for panasonic

3/8" + 3/4" for 3.0hp

Thanks for the info, i do recall something about 5/8" my friend told me. If not mistaken many will use 1/4" & 5/8" for 2hp and above.

as i said: it will totally depend on many factors. major factor overlooked: how well or badly is the room insulated and how big is the air-exchange? 25 sqm is absolutely enough if the room is insulated.

Air tight

When choosing an air condition to your home is a big decision,.Canvass is the best thing to do..then,try to choose the very best.

Thanks for sharing..!

Called the A/C shop. Daikin released a new model with 1.75HP Inverter using R22.

Hitachi and Mitsubishi Mr Slim inverter aircond have higher EER, and provides 2 years part warranty and 7 years compressor warranty. although they are expensive than others, it is good to invest it in long run.

Mitsubishi Mr Slim come with lousy remote control

Panasonic Inverter 1.75HP has the highest EER among all the Panasonic models, i.e. 12.7
How about Hitachi and Mitsubishi?

Hitachi RAS-X13CY (1.5HP) has EER of 12.7, BTU is 12,630
Mitsubishi Mr Slim MSY-GE15VA (1.5HP) BTU is 14,330, EER is 11.3

I have Hitachi RAS-X10CZ, it has highest EER of 13.4 among all 1HP airconds, really energy saver, only drawback is kinda noisy sometime in quiet mode.

if you want to have faster cooling, mr slim has better rating, although it might not as energy efficient as Hitachi.

y said so? My Mr Slim remote even better than the basic Pana

the problem with EER and inverters is that it doesnt totally reflect the true savings. if i understand it correctly, EER will be calculated under full load which is not the optimal usage point for inverter a/cs. under partial load the effective EER would be a lot higher.

that beeing said my point on the issue is this:

make sure you slightly oversize the inverter ac for the room so that it always runs on partial load. if you care to research, choose one with the highest EER under 1/2 and/or 3/4 load.

consider:

desired room temp

degree of insulation (no need for it to be airtight. my example the room has one or two doors open, PC running 24/7, people run through a couple of hours per day, usually 12 hours per day one person inside only though. a/c cools to actual 25°C (setting 28° dry gives actual 25° across the room) and is mostly on lowest partial load once the room is chilled down)

amount of people

level of air-exchange

amount of appliances

how many windows (and how much heat from there)

ceiling insulation

if you do that, you'll be able to choose the right choice of A/C (hopefully). all the installers suggested that we hopelessly underpowered the ACs for the rooms but they dont break a sweat. i cool a 45 sqm hall (3,5 ceiling height) with 1 (!) 2 HP inverter ac and a ceiling fan to distribute the cool air properly in the hall. even on a hot day the ac is on minimum load almost all the time. windows tinted, ceiling insulated, heat reflecting paint, draft-safe windows etc. all add up.

Are you sure Mitsubishi Mr Slim MSY-GE15VA (1.5HP) BTU is 14,330? I think it should be 11943.

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Added on April 3, 2012, 8:05 pmDoes R410a much more energy saving than R22? If yes, why?


This post has been edited by slackinux: Apr 3 2012, 08:05 PM

http://www.coolserve.com.sg/htmdocs/produc...ils.asp?id=2398

It is as powerful as Panasonic 1.75HP version

Opps, sorry. Is my mistake. 11,943 BTU should be MSY-GE13VA

http://www.melcosales.com.my/products/aircond/mr-slim-rac

MSY-GE15VA not available in Malaysia market.

No real time on off timer

Want real cooling, but don't mind the noise. Get York or Acson.

What you want the Real time for? You use it as time?
Just set the timer for How long you want it start or stop when need, instead of a timer to start in where keep let the aircon in standby mode.

Like Sharp, only have running timer. Not clock timer. Clock timer you can set what time it switch on, and what time it switch off.

very specific question. what's sure: R22 is beeing phased out because it harms the ozone layer. that for me is enough reason no to use ACs with R22 and i dont.

now to your question: R401A tends to be more energy efficient than R22. if i remember correctly by 10-15% but i really dont have the supporting figure at hand anymore. i looked into this around 4 years ago when i changed my ACs to 401A inverters. i found an interesting read on the issue here:

https://docs.google.com/viewer?a=v&q=cache:...zusFVDI_EZB-DUg