Suggest a 2T Non-Inverter AC for top floor room

A

alpha1980

Messages
60
Location
India
ISP
Airtel
Hello,

I need to buy new AC for 190 sqft room top floor (sun directly hits the roof). So I know I need at least 2 Ton, but confusion is many people says that few brands 1.5 Ton AC's cooling is equivalent to 2 Ton in the other. So which brand I need and what tonnage?

A bit history on why I want new AC.
My first AC was 1.5 ton Voltas non inverter, It ran good the first year but cooling reduced from next year.
Many technicians have visited only to tell me that my AC is running perfectly. God knows what happened. But it won't chill the room as it used to do before and the compressor continues to run and room temp goes down but very slow. After so many diagnostics I came to a conclusion that because the unit was not vacuumed at install time, it's cooling efficiency was reduced but all technicians deny this fact. But I don't want to waste anymore time and money on this, I would rather buy new. My current AC already 5 years old now but this problem started happening since 2020, I bought it in 2019. In a nutshell I want to avoid this voltas brand all together.


Back to where we were, this post is about which brand's AC is must buy and what tonnage do I need 1.5 or 2 and it's cooling capacity, I want non inverter only.


Regards!
 
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I might get this vacuum done as a last resort. Even though the local technician says it won't make any difference but I still want to try. There must be a good reason why this step is included in the installation manual and yet it was not performed.

In India that's the thing, every another guy can become ac technician with little to no knowledge (with some practical knowledge). In other countries, there's a proper course for this which you must pass and other steps before getting your license.
 
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@nitin_g3
Did you see whether your ac was vacuumed at the time of installation? Such issue where "the room temp won't come down even after longer AC runtime" can be due to two factors if everything else is working correctly according to LG technician.

1: room size too big for the AC you've. Which I'm sure is not the case.
2: air somehow entered the gas lines, reducing cooling.

I still need to confirm this myself whether air in the lines can really affect the cooling performance. I'm thinking of releasing the gas of my current AC, flush the lines with nitrogen to remove any moisture then vacuum and refill up fresh gas. If this doesn't improve it's cooling then I will give up and buy new AC.
 
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Vacuuming needs to be done during setting up the AC before starting it for the first time and if you are moving an AC which calls for dismantling it.

Once the AC is in running state, it won't make any sense to vacuum it because the impurities are already part of the system.
 
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Vacuuming needs to be done during setting up the AC before starting it for the first time and if you are moving an AC which calls for dismantling it.
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I wish I knew that before buying AC otherwise I would've said something to the installer guys, but when they didn't vacuum during shifting time, I told them why they didn't vacuum, he said it won't make any difference and he has 5 years of experience doing this.

Unfortunately I was not at home during this time otherwise I would've forced them to vacuum before releasing the gas.
 
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What type of impurities are we talking about?
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Impurities such as air which is a mixture of many gases. This needs to be removed for the proper functioning of the whole system and only the required gas should be present. And I think this is a fundamental truth, lets see it like this, if you mix water into the pure ink color, it will dilute and loose it's original quality same with milk, if you mix water in it, it will loose it's nutritious value. Same concept here, if air is mixed with pure refrigerant gas, it will loose it's designed cooling capability.
 
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Couple that with how the impurities mixes with the refrigerant and damages the AC system internally. This is a long process and depending on the impurities, the process can be fast or slow.

Hence vacuuming is a must to ensure optimal performance and longevity.

Those fake technicians will tell you there's no need and the refrigerant will remove the impurities, but in that process, you also lose valuable gas. So if your system is designed for 5000W at 5 kg refrigerant, as the refrigerant was used to clear the system of the impurities, you are only left with, say, 3.5-4kg of gas. Obviously your efficiency is going down and you will run your AC longer to cool your room, which will further damage your system internally and the cycle continues.

Who wins here?? It's the manufacturer!!
I don't know if it's Daikin or Mitsubishi, but they clearly mention warranty will be void if vacuuming is not done in their manual.
 
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@alpha1980 hey I'm late to the party, but I noticed no one talking about cleaning outdoor unit. I face the same issue with my 1T IFB AC.
I live in a city with hell lot of dust, this AC runs for 16-18 hrs daily and a lot of dust gets accumulated in the heat sink grills of the outdoor unit.
When this happens after every 2 years the AC cannot cool the room below 27-26 °C.
Every time the technician runs the ODU with lot of water that literally turns black when coming out of it.
After such service the AC cools down to my desired temperature (22 - 24°).

You can get the ODU cleaned completely if not tried this yet.
 
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