I bought Hisense HAC-12DJN 1.5HP Air Conditioner and alrdy used for 5 months until now. surprisingly the indoor and outdoor unit work more silent compare to other brand. 4 star energy rating which is very rare to get on its price range

This post has been edited by firdausenzo: Oct 26 2017, 05:03 PM

Copper size depends on how many tons or hp : R410 use thicker copper.
I assume most are mini split unit for home and shop-lot.
1 hp : 1/4" and 3/8"
1.5 hp : 1/4" and 1/2"



When you see ice build up at the vapor line (the smaller tube near compressor) and the indoor fin, meaning not enough gas. Investigate the leaking, 95% due to connector.
Your electricity bill will double/triple if you still continue to ON the A/C unit because compressor will not cut-off.

So, the question is how long the gas could last? The answer is forever but even a perfect flare will not guarantee 100% no leaking.
A good installation could last you more than 10 years of gas, gas will start to leak due to :
1) vibration of compressor, flare connection, liquid nut, rubber inside the nut (start to worn out after > 5-10 years)
2) bad flare, bad connection, etc

My 1 cents

This post has been edited by amco: Oct 27 2017, 12:42 AM

I see, I suppose its possible that the R410 gas is leaking then, my electricity bill has shot up recently =\

If I were to investigate the leak, is it enough to brush soapy water on the pipes like how its done for tyres? Or should I get a repairman to have it checked out professionally?

Once again, thanks and cheers!

Not cooling could be :
1) Blower (indoor unit) wind not strong/not blowing -->indoor capacitor RM 3 (can diy)
2) Check compressor (outdoor unit), if ice building up at vapor line --->. need to recharge gas (need handyman to repair leaking & charging)
3) Compressor or fan not starting up --> investigate & start checking fan & compressor capacitor (can diy)
4) A/C cool for first few minutes --> Fan problem and/or compressor overheat heating (need handyman)

** if your compressor not blowing hot and strong wind, you have problem with A/C**


To check leaking, use soap mixed with water will do. No need spend extra $.

If leaking via the connector, try tighten the nut. If still leaking, either you call an AC handyman.
No point DIYing if you only have 1 or 2 units, because you need to buy many tools :
- flaring tools & cutter RM 50-90
- manifolds gauge RM 130
- R410A gas 13kg RM 400 (can use >10 times though)
- vacuum pump RM 250-350
- Clamp meter to check amp draw RM 50 - 200



This post has been edited by amco: Oct 28 2017, 02:20 AM

Wow - thanks for the wealth of info man. That's really really helpful.

I checked for leaks with soapy water but didn't find anything. Ice doesn't build up on other places, only the edges where some fins are bent badly - I slowly straightened them but I don't think it had much of an effect on overall coolness. It did stop icing up though.

Anyways, I ended up calling an AC handyman to help me get the unit checked out, and it was overhauled (cleaned indoor and outdoor units). Apparently the gas was not leaking - guess its just my indoor unit that was pretty dirty and clogged up.

Once again, thanks! Learnt a lot from you.

what if when i turn on my aircond the outdoor unit start a bit late that indoor unit, like 1-2 minute late.. is there something wrong with my outdoor unit or it just a normal things.. not sure it was always like this because i rarely use that aircond.

It's normal the compressor (outdoor unit) will start after 10sec - 4min), and it depends on brand and model because parts are different such as PCB, coil sensor, temperature sensor, etc.

Ohh i see, ask the handyman about the pressure reading, R410A gas should be around 100-110. Anything lower than this should be topped up with gas and major leaks should be investigated asap (like no cool after 1-30days). Icy on indoor fins are due to :
(1) Indoor blower not strong/ not blowing -->change capacitor or change blower motor
(2) Not enough gas

Dirt only prevent cool wind blowing out efficiently and should not make any ice. Most probably insufficient gas and can be checked by using manifold gauge meter & amp clamp meter.

thanks a lot bro

Gentlemen,if you like reliability get Carrier. If you still can find one even though the price is slightly higher, get it. It lasted for almost 20 years. It is still working though,only because it became noisy and repairman said no more parts so i changed. Carrier is crazily reliable. Googled the brand and it was them that invented aircond! And the space station used carrier! Btw i changed to Panasonic mid range ion 1hp model and it broke down exactly 1 week after the 1 year warranty! Repairman found the cooling coil leaked and require weldering. Cost me almost $300 to fix. Seems like even japanese brand is not trustable anymore.

This post has been edited by turion64: Jul 14 2018, 03:19 PM

Rm300?
Better change aircon.

Once one of the c-joint start leaking, the rest will follow soon.
And there will be endless cycle of repair.

It’s been 3 years. How’s your Hisense holding up?

3 years bro any regret?

How about your feedback after 3 years?

Feedback on your Hisense?

I’m considering one 2.5hp and one 1.5hp Hisense.

Get Acson/Daikin if you want reliability

Installed a new 2.5hp inverter Hisense AC right before puasa month (2.5 months ago). So far so good. Outdoor unit noise acceptable. Still too new to make an assessment but so far it does the job cooling my living room+dining area. I only turn it on when it's really hot or when we have guests though.

So far so good. It just as cold as Wira aircond..
- If you need a basic budget aircond for cooling your home, go for Hisense.. Been using for 2 years, satisfied with product qualities..
- Hisense blowing fresh air and the air smell wangi..
- I am currently using Non inventer Hisense 1.5hp to cooling my bedroom..
- Electricity is about RM 1.00 per day..
- For a basic budget aircond, is a worth buy.


Anyway, if have more budget, you might want to upgrade to Sharp with Plasmacluster, because it capable to clean the air..

hisense aircon and tv also good

Where to buy hisense? I saw Haier rm900 1 hp 3 years warranty. Is it similar to hisense?

hisense 2.5 hp 1.5k RM only....other brands need at least 2k...500 saving..worth or not

Hi, mind sharing average how many hours you are using per day? am considering to get the R32 gas non-inverter one

How’s hisense