You choose aesthetics as your most important criteria. Okay then.

This post has been edited by stormer.lyn: Mar 17 2024, 12:05 PM

Compressor overheating?
Compressor start capacitor problem?
Control relay(s) on IDU PCB intermittent?
IDU temperature sensor intermittent?

Actually I would think installer is more than 70% important, as factory is so very rarely going to produce a lemon design. Maybe individually within a production run there will be a (maybe) 1.5% failure rate due to bad soldering or component failure etc, but the warranty takes care of that one unit failure.

But installer? 100% of the air conds are commissioned by an installer. I honestly think you do the right thing by hiring a good installer.

That's not exactly true. Most people do not know there are certifications for techs in M'sia, hence do not ask of it from the installer.



(I hope I haven't doxxed anyone)

This post has been edited by stormer.lyn: Apr 18 2024, 08:29 PM

Actually there is..... but I bolded and underlined the part of your post that I have found to be pertinent. Plus we come back to the standard of enforcement in M'sia of "there is none".

Just yesterday I was with a friend, following him while he was servicing his car air cond with bawah-pokok bengkel run by foreigners. No need recovery pump, just release the gas into the atmosphere who cares.

This post has been edited by stormer.lyn: Apr 18 2024, 10:48 AM

I donno lah. Is it because people just don't care? Throw radiator water, or just dump engine oil (the rempits staying my apartment complex do their own servicing), and then ask why the rivers are polluted. F@rk lah these people.

Edit: I better stop here, becoming political rant already

This post has been edited by stormer.lyn: Apr 18 2024, 11:24 AM

1. Tells you the pressure (and thus the temperature) in the system
2. Multiple input/outputs so equipment or gases can be connected to
3. A system of valves that allow you to isolate the pressure system in the a/cond unit


This post has been edited by stormer.lyn: Apr 19 2024, 09:40 PM

Unfortunately, yes. You will have the same issue in the future if the leak is not fixed first.

I'm qualified to install air conds, and I actually wouldn't mind Midea for my own home. (Especially MSEP series because easy to clean)
Just anecdotal opinion from me.

1. To remove moisture from the system
2. To remove non-refrigerant gases from the system

How long is the a/cond turned on per day? 10 hours per day at 18°C set temperature can easily reach that amount a month for a 2 HP unit

Are you looking for a magic answer like "just clean the filters and the a/cond will be cool"?

Something is obviously not working properly. Call a competent repair person to have a look and tell you what is wrong with the unit.

This is the copper pipe pressure data from Daikin



In theory the thinnest walled copper pipe (0.61 mm) can withstand the pressure in an R32 system. My data tables go until 400 psi for the high pressure side for R32, which is well under the bursting pressure limit. R410 and R32 systems run at similar pressures, so a R410 system should convert to R32 without issues. Opinion: I believe the failure point when using thinner pipe is at the joints, not the actual bursting of the pipes. So I also use Nylog Blue on all the flares.

You can use the incorrect pipe size for the a/cond, but the efficiency (both cooling and electrical) will drop. By how much I can't tell you.
Please note that brazing copper pipe will form copper oxides on the inside if there is normal air inside the tube. You must flow a dry inert gas when brazing. The particles formed by bad brazing is bad for the system. (I use Argon not Nitrogen, because I do a bit of TIG welding, and already have the gas on hand. No need for the cost of additional N₂ gas and tank and flow meter, although Ar is more expensive)

You shouldn't mix lubricating oils. Some lubricating oils are incompatible with each other, for eg PAG and mineral oil. Wear and tear will increase or the compressor may jam. So the tubes must be flushed with solvent before changing refrigeration gas systems. It is not necessary to purge the system with N₂ gas at this point, only during brazing.

And finally, you can't vacuum the system for too much or too long before charging the refrigeration gas.

Any of the above done/not done, will lead to a failure. Maybe in 3 months, maybe in 3 years, maybe in 30 years. I donno cannot say depends on luck, the star sign of the installer, and the phase of the moon.

Hope the information helped. Run new surface piping, if done properly, should give you the best results. But like you said is a bit uglier than concealed piping.

The correct way would be bolted with isolation mounts, but at the very least should be bolted/screwed.

Sorry I can't help, I'm not in the home consumer side of HVAC (yet). But I can say I think* the Midea All Easy Pro is good. I have installed personally for my own family members. So far so good, and really easy for doing a good cleaning service.
*my opinion

This post has been edited by stormer.lyn: May 27 2024, 10:55 PM

Pressurize the pipes and you may be able to detect the leak with an ultrasonic leak detector

That's a tough choice. You want something that easily spoilt, so everyone makes spare parts for it...
or....
something that rarely spoilt, but difficult to find spare parts for it?

I also donno what to think. But if you see the ranking for China specific manufactures, Gree is at top place
Top 10 air conditioning manufacturers in China
So I guess your a/cond tech may be somewhat telling the truth.

Me personally I like Midea all easy pro because easy to service

But won't there be spare parts for a commodity item like an a/cond that always spoilt? If the 3rd party spare parts manufacturer can make money, won't they choose the parts for the model that always kong?

If you were a car spare parts manufacturer in Malaysia, would you make brake pads for Myvi, or for Dacia? That's my logic anyway.