This diagram is breaker indoor to outdoor.
1 and 2 is L N for outdoor and Sig is signal.
Outdoor have 2 stage diode bridge which is the same. You can connect either top or bottom.

The only possible way is to find the same piping size but the unit is 1.5hp. Usually piping for 1.5hp is 1/4 - 1/2 inches for Daikin pana or ME. However, I found a unit which is Fujitsu inverter model ASAG12JLCA/AOAG12JLCA the piping is using 1/4 - 3/8. I'm not sure about samsung lg Sharp or other brands. You can always check it on their broucher upon visit the air con shop.

Good luck.

Before it was 1.0hp. And you plan to change it to 1.5. So I assume 1.0hp isn't really enough for you although the space is about 180sq. Is really up to you tho. For my perspective more cooling is better than less in our tropical country. Sometimes we can't predict how hot it will be in Malaysia.

You can install the plaster bone first. Let the air con man finish run the piping and drain pipe then only ask the plaster guy to cover the whole ceiling. Get the air con man and plaster man to meeting. Both of them must discuss first. Once done run the pipes, ask the plaster guy to cut approx 34 x 34 inches for the air con. And a 12 x 12 main hole for servicing. Then air con only install.

1hp - 1.5hp
Rm250 for r410 inclusive
10 ft copper pipe
10 ft drain pipe
Bracket
Wiring to nearest power point with cable clips

2hp - 2.5hp is around rm350 for r410

If is more than 5 years and now it's breakdown you might consider to get a new one. Afraid that after repaired than other stuff spoil. And then will cost you a fortune to replace a new one.

1/4 high side pipe
Thickness 0.61 (withstand r410 pressure)

5/8 low side pipe
Thickness 0.61 (withstand r410 pressure)

Or could be..

1/2 low side for 2.0hp you need to check your air con spec first before purchase the pipes. 1/4 is definitely need it. Is just the low side pipe could be different.

Insulation get 7/8 x 3/8 1 piece insulation is 6 feet so you need get 4 piece for 20 ft

Wiring tri-core get about 30ft for extra. Wiring get either

1. Fajar cable (sirim approved)
2. Million cable (sirim approve)

Or 2.5mm pure copper cable. 2.5mm will get in separate colors red/black/green

Tri-core is all in one. 2.5mm durability is better for concealed job.

The brand I'm working with only charge for compressor replacement after a year. Means we provide 1 year free charges and spare parts. However compressor is 5 years warranty. Within a year if compressor dead we do not charge a single cents. But after a year. We have charges for the labour but not the compressor.

Your case like this is not acceptable. Totally wrong.

Include wiring?

Not expensive then. Is reasonable.

Item 3 is one of the possible way of water leakage. If the refrigerant is not enough. The liquid line gets colder. When the liquid line run through the cooling coil the water droplets at cooling coil tend to get bigger and it will pull out from the blower wheel. Usually cooling coil will will receive the liquid at the back of the indoor (mostly cooling coil is in V shape) and then to the front. Since is not enough refrigerant, the front coil will not get cold after the liquid is evaporated into gas. Worst scenario it will get frozen up and you can't get the maximum cooling capacity. If a unit is enough of refrigerant. The water will get much more tiny and it will flow down from the coil to the drain pan. I have some example at the following pictures. This unit is a R410 non inverter. You can check out how bad is the leakage. Btw. Recommended psi for R410 is 130 - 150psi


This post has been edited by weng-aircon: Aug 12 2016, 12:37 AM


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Not only inverter or non inverter needs recharge more than 100 psi, any air con which is using HFC refrigerant (R410) needs more than that. Are you mentioning about R22 ? R22 is less than 70psi.

This post has been edited by weng-aircon: Aug 12 2016, 09:52 AM

Why the price is expensive is because it gives better benefit and advantage. Cassette usually mount at the center of the area. it has 4 air vents where the air comes out. So cassette require a larger fan motor and lightweight blower wheel to produce this capacity to ensure each area get to cool down faster compare to a wall mounted.

This is 1 cost

+

Cassette has a build in water pump in it. If you find your area don't have a proper place to discharge. Well. Cassette have 2 types of choice to discharge. Not forget the powerful water pump can push the water up to 2 feet to the top and flow down gradually.
1. Discharge at the top of the ceiling to outside
2. Discharge from top to ground to outside

This is another cost

+

Cassette panel nowadays have surround air meanwhile traditional cassette only have 4 way to bring the cool air out. With this design. End user get to enjoy more comfortable air wherever they are in the area. With this design...

There's another cost.

+

If your cassette is has a inverter function. There's another cost

=


Cost more compare to a wall mounted.

This post has been edited by weng-aircon: Aug 16 2016, 10:27 PM

You have layout?

Your room need 2.0hp to support your room base on the measurement you provided. Since your old ac is Midea 1.5hp the piping should be size at 1/4 and 1/2 in inches and the thickness is confirm less than 0.61mm

Nowadays the piping for Daikin, Pana, ME or Acson in 2.0hp should be using the same measurement as the 1.5hp Midea but in terms of the thickness, mostly aircon man will suggest to replace the old piping with the new inverter piping cause the thickness is different (R410- 0.61mm) (R22- 0.51mm) so here's the trick, we know latest refrigerant needs at least 0.61mm to support the pressure but... If your piping is not concealed then I will suggest to replace entire piping. If your piping is concealed and don't wanna spend a big buck. Tell your aircon man to braze the 0.61mm piping near the indoor and outdoor joints. This trick is safe too and will not blown the joints if the technician is well experience in brazing.

Not to forget the piping need to do entire flush down with nitrogen. The oil in the old piping is very contaminated.

Your case is still have hope to replace a 2.0hp air con. You just need to find a right guy to do it.

Check the picture for the Midea 1.5hp and Pana 2.0hp piping size. Is actually to suit your needs. Just thickness different but it can be solve.

This post has been edited by weng-aircon: Sep 11 2016, 03:36 PM


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0.57mm still in my room as test lab. It's about 2 years. So far not blown yet. But still suggest to braze with 0.61mm first as I still not confirm will it burst for another 3 years. Btw is not a difficult job for the tech guy to braze it. Just make sure they braze it properly.

Play safe first. Ask them to braze.

Much more expensive. Compare to 3 sets single split. Multi save more.

Need to make a hole for a person to look up + measure + check how to runs the pipes.

I find this model airflow noise quite loud.