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 Aircon Discussion V3, Home Appliance

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ceo684
post Aug 10 2018, 03:47 PM

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QUOTE(mun2020 @ Aug 8 2018, 04:58 PM)
So, the R32 GAS is cheaper than GAS 410A ?
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Yes because R32 is single component and R410 is a composite (of a few component) refrigerant.

However in terms of longetivity, I think I haven't seen much R32 based aircon with 10 years warranty.
Many R410 AC can give 10 yrs compressor warranty because the discharge temp is lower for R410 (vs R32).

QUOTE
The significant problem is that R32 has a high discharge temperature. Its direct consequence is the oil degradation which can cause various compressor failures like bearing seizure, low system and compressor efficiency. So the discharge temperature should be limited at an acceptable level to make sure that system and compressor could work normally. Usually is to control discharge temperature by refrigerant.


from Sos: Danfoss website

Hence I think I'll stick back to getting an R410 inverter unit (instead of R32) as the compressor should last longer.
ceo684
post Aug 10 2018, 03:54 PM

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QUOTE(CP88 @ Jul 28 2018, 03:17 PM)
Which Mitsubishi? Mitsubishi Heavy Industries or Mitsubishi Electric?  biggrin.gif
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Care to share what's the diff between units from MHI vs ME? Is one of them supposedly better in terms of quality?
ceo684
post Dec 23 2018, 10:58 PM

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QUOTE(kumario9 @ Dec 23 2018, 10:40 PM)
Ok. Not Panasonic. Is Mitsubishi and Daikin good? Thinking of putting Daikin 2.0HP in hall and Mitsubishi 1.0 in each room. Any difference using Inverter and Non-Inverter? My friend told me doesn't make any big difference unless using the air-con 24x7.
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Inverter = motor soft start je. For the compressor motor.
If you run at 26-27C then inverter will save the running cost because each time the motor starts (from zero) it is maximum inrush of current i.e. maximum TNB consumption at that point moneyflies.gif moneyflies.gif moneyflies.gif . The theory is like you pushing a car from stationary position. Inverter is your lucky day, the car is on a downhill.

If you run at super cold temperature like 16-20C non inverter is cheaper since the motor wont turn off anyway. The theory is also you pushing a car, just that the car never stopped, so it is always easy to push.

This post has been edited by ceo684: Dec 23 2018, 10:58 PM
ceo684
post Mar 24 2019, 05:24 PM

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QUOTE(omg528 @ Mar 24 2019, 12:50 PM)
what will happen if the room is about 11000btu and I install 1.0hp aircond only...
is it ok?
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Should be OK if the walls are not exposed to the evening sun much [i.e. abnormally heated]. It'll be a bit slower to cool down compared to a 1.5hp (eg may take 45 mins to cool your room as compared to maybe 30 mins with a 1.5hp).

This post has been edited by ceo684: Mar 24 2019, 05:24 PM
ceo684
post Apr 30 2019, 11:19 AM

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QUOTE(ben3003 @ Apr 30 2019, 07:43 AM)
Just wanna check, my aircon from mhi srk series 1hp bought around 4yrs ago, anyone know if the unit can use r32 gas without modification?
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Theoretically R410 is a mixture of some R32 + some other gas.
If the world shortage of R410 I think you can still run with R32, but since its not world shortage, use the correct gas, later the internal organs lack lubrication or run too hot or compressor work 100% because cannot achieve R410 pressure kah, as we are not using as what the engineers designed originally.
Cos R32 and R410 technical characteristics are different.

This post has been edited by ceo684: Apr 30 2019, 11:19 AM
ceo684
post Apr 30 2019, 12:15 PM

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QUOTE(DuitNow @ Apr 30 2019, 11:30 AM)
So R410a aircon really can use R32 gas? blink.gif
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R410 = carrot susu drink
R32 = pure carrot juice
ceo684
post May 16 2019, 01:38 AM

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QUOTE(carimari @ May 15 2019, 12:48 PM)
is Daikin A/C any good? cooling wise and parts wise. I am thinking of updating my York A/C.. tried Panasonic before.. its doesn't provide enough cooling compared to York.

Also on same topic, is it still good to buy York? or can skip the brand it altogether?

Any tips on this.?
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Powerful cooling go for R32 Hitachi. The first gen R32 (not the latest one) i.e. the RAS-SX10CJ family, that one BTU/h higher.
ceo684
post Jul 11 2019, 02:52 PM

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QUOTE(barca96 @ Jul 11 2019, 01:14 PM)
Panasonic has the shower cooling effect. But is that really working? Wouldn't the fan need to be on high in order to achieve this effect where the cool air blows across the room?

user posted image
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They just angle the blade to throw the air farther so that the far ends of the room have cooling too. Think even cooling
ceo684
post Jul 11 2019, 02:57 PM

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QUOTE(seikoho1 @ Jul 11 2019, 12:17 PM)
i bought a trane 2.5 hp from lazada, seems good right now...
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How is the compressor noise? Hmm they give 6 years warranty on compressor only
ceo684
post Jul 26 2019, 10:56 AM

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QUOTE(Cyberbullies @ Jul 19 2019, 05:39 PM)
Any idea why our 1.5HP here uses 9.52mm copper pipe instead of 12.7mm and our 2.5HP uses 12.7mm instead of 15.88mm when the latter is the standard worldwide including Singapore?

And i was told by both air conditioner and daikin technician that it is not advised to connect 12.7mm to 1.5HP or 15.88mm to 2.5HP because doing so will increase noise and void warranty as it would cause problems to the compressor.

Seems to me that we are buying seemingly higher HP air conditioner but actually with lower capacity than advertised due to the limit of the copper size.
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I would follow the spec in the manual. Pipe diameter will vary according to the HP of the AC.
If it says 12.7 or 15.88 there then follow la. These contractors use smaller diameter so it will save cost for them as its not their aircon, its yours. It will still work but not optimum la.. Think of driving a car on second gear all the way.. Sure it will move but makan minyak la. If you use smaller than specced pipe, it will still work but in the end your system running at higher than usual pressure.. Another way to sell you more aircon in future.

I would trust the engineer who design the aircon system, who has completed at least an engineering degree rather than a cap ayam installer technician tongue.gif
ceo684
post Jul 31 2019, 10:37 AM

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QUOTE(jetwash @ Jul 16 2019, 09:51 AM)
Why the apparent lack of mention of York in this thread?

Really bad ah nowadays? Planning on getting a 2.5 HP York.
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York don't seem to have R32 models...
ceo684
post Jul 31 2019, 10:44 AM

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QUOTE(Spawny @ Jul 29 2019, 01:31 AM)
My interior design is suggesting a Cassette AC in the living hall, but i'm not sure if its the right choice for a double storey house. Does it takes more power and if the maintenance is much more expensive?
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You need to ensure enough height of the ceiling. You will need clearance left about at least 1.8m from indoor unit to floor.
These are excerpts from York/Gree ceiling AC manuals.

Attached Image

Attached Image
ceo684
post Jul 31 2019, 10:46 AM

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QUOTE(elmodistortion @ Jul 28 2019, 09:15 AM)
Hi guys, how to well position compressor, must be levelling, below or above?
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It is always advisable to keep the outdoor unit at the height above the indoor unit. If the outdoor unit is kept at level below the indoor, some of the compressor power is used in pumping the refrigerant against the gravity, thus reducing the overall performance of the compressor. Most of the outdoor units are quite silent so one does not have to worry about their noise. The internal parts of the outdoor unit are shielded against the rain and sun rays, so one can rest assured about their safety in different climatic conditions.

https://www.brighthubengineering.com/hvac/4...g-the-location/
ceo684
post Jul 31 2019, 10:49 AM

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QUOTE(Cyberbullies @ Jul 26 2019, 08:22 PM)
Haha you got my message wrongly, i was trying to say that Daikin should have allowed a bigger copper pipe like the international standards.

This aside, for back-to-back installation, did anyone ever request installers to drill left hole instead of right hole for easy maintenance since the copper pipe going to the outside can be connected indoor?
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Ahh my bad. I stand corrected. Maybe they designed their system differently, like not all cars say 2.0L will have the exact same exhaust pipe size due to variations in engine etc.

You mean the orientation of the AC piping? Whichever that allows for easy maintenance and no crazy bending of pipes would be the best. Straight as possible for max efficiency.
ceo684
post Aug 1 2019, 03:47 PM

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QUOTE(Snoy @ Aug 1 2019, 03:32 PM)
Need some advises here.

Recently, my aircon is not cold anymore.
After checking the coolant is OK, the contractor claimed that the compressor PCB board is defective.

Replacement cost is RM710 (part + labor).
Is the price reasonable for Panasonic 1HP inverter aircon?

Anyone has recommended contractor?

Should I consider to top up RM400 to get a brand new Sharp inverter aircon with installation?
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Better buy a brand new aircon especially if your AC >5 years, at least you get new warranty.
Can consider Hitachi as well if for own stay long term usage.
ceo684
post Aug 2 2019, 09:01 AM

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QUOTE(Snoy @ Aug 1 2019, 06:12 PM)
Current AC is about 4 years old and rarely used.
Just not sure why it can spoil suddenly.

Cost to replace the compressor pcb board is ridiculously high, any chance to get better price?
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For best result, outdoor unit need to be in cool place not baking in the sun or wet from rain.
If you can get the PCB out, can try taking to repair shops presumably ard Jalan Pasar to try to fix. Many ppl fix the ceiling fan capacitors.
But typically inverter lifespan is about 5-10 years (for industrial motors) - this is usually because of the inverter's capacitor failing circa 40000 hours (cap lifespan)

Sometimes it could also be because of surge/spike in voltage. TNB tries to give us 240V but sometimes can be higher (you can get a voltmeter and test) brows.gif
ceo684
post Aug 9 2019, 03:15 PM

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QUOTE(twosocks @ Aug 8 2019, 04:02 PM)
My daikin inverter Aircond unit showing error code E7.

From daikin website I managed to get the error message as
Outdoor DC Fan Motor Lock

Normally, what cause the fan to lock up?
Any idea cost to r place the fan?
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Can be jammed because of bearing stuck with dirt/hair/paint particles, or simply lack of lubrication. If u take a stick to try to poke the fan to rotate, does it start?
ceo684
post Aug 9 2019, 03:19 PM

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QUOTE(blibala @ Aug 7 2019, 09:02 AM)
What is the minimum thickness of pipe for inverter aircond? Technician said 0.61mm is sufficient but catalogue recommended 0.80.
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0.80 is not common, common is 0.61 or 0.7mm
0.80mm u are looking at good stuff e.g. inaba denko paircoil - https://www.monotaro.my/g/00213825/#
ceo684
post Aug 9 2019, 03:20 PM

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QUOTE(Spiderjohanna @ Aug 7 2019, 12:01 AM)
Hi all, have a question to ask. Recently bought a 2 HP casette aircon and a 1HP wall mount aircon (Both Daikin). Now the problem lies with the 2 HP Casette aircon, initially 2 of the vents was working fine as in they were blowing cool air, but the other 2 wasnt, technicians came to check,found that not enough refrigent gas was pump into the compressor during installation, once they pump gas in, everything was fine,aircon was cool again. However, after a week or so, I realise that the aircons performance wasnt as good as usual, when it turn it on to max fan speed and 16 degrees, its not as cold as i imagined it to be. Technicians came to check again and they mention that there was nothing wrong with it.

I would like to ask:
1. Is the blower of the 2 HP casette aircon as strong as the 1 HP Wall mount aircon (I noticed that when the blower was set at max speed, the 2 HP aircon power is significantly less than the 1 HP aircon
2. Temperature set to 16 degrees, will the air released from the 2 HP aircon at least feel 16 degrees near the vents? Granted my 2 HP aircon is situated in the waiting area which is slightly bigger than the room  where the 1 HP is in. I feel the air released from the 2 HP aircon is not as cold as i imagined to be.

Thanks all!
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Maybe got leak in the ac piping or insulation not good? Try spraying water into the outdoor unit fins for the 2HP and see if it cools better
ceo684
post Aug 14 2019, 02:46 PM

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QUOTE(Cyberbullies @ Aug 9 2019, 08:28 PM)
Just installed 4 aircons using inaba denko paircoil - good stuff. Didn't use all so got leftover for both 9.52 & 12.7 if anyone is interested to buy can PM me i cut for you the length you need.
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How long is the balance uncut length u have?


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