Air conditioning - Any recommendations please?? - Part 2

[light84]

Hello, I'm intending to also revamp my parent's air-conditioning system. May I check if it's advisable to place 2 aircons back to back like the image below (sorry and thanks bro BiG_FisH borrow ur photo for example), both on the wall inbetween Bedroom 2 and the Master bedroom. Will it cause any condensation or heat issues if the aircons are so close to each other?

Spoiler

No issues, in fact it is good as 1 trunking can run the pipes for both fan coil blowers and the drain pipe can be shared as well.

 

[Alphas]

It’s advisable to place FCU above the door whenever possible.

 

[freedom-strike]

Any more reviews for Upton Aircons, anyone?

 

[freshvibes]

It’s advisable to place FCU above the door whenever possible.

Best placement to avoid obstructing furnitures too.

 

[Horchew]

Anybody using Avolta sys 4?

 

[scorpy81]

Hi all,

Need some advice since I noob in aircon.

a)Is it ok to buy 3 FCU (3 x 9000BTU) and then later down the road after few years time, add one more 9000BTU FCU to the current outdoor unit (this is considering the outdoor unit is capable of handling the extra FCU unit). Or it cannot be done due to piping or things already sealed etc? Or will cost be very expensive?

b) If example 5 room HDB resale unit (i cannot say the square feet because not really sure) living room (closed kitchen) install a 9000BTU FCU, if we are ok to on the aircon way early (like 30 minutes earlier) to slowly cool the room for accepting guests, will it make sense or doable? Or 9000BTU just cannot cool living room no matter how early we on the aircon?

Thanks in advance and hope for advice

 

[potato_chips]

No issues, in fact it is good as 1 trunking can run the pipes for both fan coil blowers and the drain pipe can be shared as well.

Thank you for your reply

 

[Alphas]

Hi all,

Need some advice since I noob in aircon.

a)Is it ok to buy 3 FCU (3 x 9000BTU) and then later down the road after few years time, add one more 9000BTU FCU to the current outdoor unit (this is considering the outdoor unit is capable of handling the extra FCU unit). Or it cannot be done due to piping or things already sealed etc? Or will cost be very expensive?

b) If example 5 room HDB resale unit (i cannot say the square feet because not really sure) living room (closed kitchen) install a 9000BTU FCU, if we are ok to on the aircon way early (like 30 minutes earlier) to slowly cool the room for accepting guests, will it make sense or doable? Or 9000BTU just cannot cool living room no matter how early we on the aircon?

Thanks in advance and hope for advice

Firstly, I think there is some assumption that the house can only have a single compressor due to electrical current or placement constraints.
a) If you get a system 4, and install 3 FCUs. Then at a later time install another FCU, it’s typically very troublesome and costly especially when there are ductings that go into build-in wardrobe etc. So it is always better to plan ahead and get 4 FCUs. The cost of a FCU is not that expensive.

b) Typical HDB living room range from 20-35 sqm. A FCU of 9k BTU cannot effectively cool down such large volume. Even it was turn on 30 min earlier, the temperature would not reach the set temp. For example, the ambient temp is 30C and set to cool to 18C. The rate of heat removal of the FCU is not sufficient to pump the heat away. So the temperature of the living room will reach a dynamic equilibrium of say 27C no matter the duration.

 

[light84]

Hi all,

Need some advice since I noob in aircon.

a)Is it ok to buy 3 FCU (3 x 9000BTU) and then later down the road after few years time, add one more 9000BTU FCU to the current outdoor unit (this is considering the outdoor unit is capable of handling the extra FCU unit). Or it cannot be done due to piping or things already sealed etc? Or will cost be very expensive?

b) If example 5 room HDB resale unit (i cannot say the square feet because not really sure) living room (closed kitchen) install a 9000BTU FCU, if we are ok to on the aircon way early (like 30 minutes earlier) to slowly cool the room for accepting guests, will it make sense or doable? Or 9000BTU just cannot cool living room no matter how early we on the aircon?

Thanks in advance and hope for advice

Yes you can add on later. As long as you make provision for future trunking path from compressor to your future aircon. Usually ppl dun do so cos it is more expensive as contractor need to pump down the system, run new pipes, vaccum and charge the system again as compared to do everything one shot. And your new trunking might interfere with existing cabinets and furniture.

B) Yes you can as the 9k, 12k and 18k fan coil blower have all the same blower fan speed except the highest fan speed. At highest fan speed, the 18k will blow more volume of air more den 12k and 12k more den 9k. The consequence is your living room will take much longer to cool down as the 9k highest fan speed is much slower than the 18k highest fan speed. Once the living room is sufficiently cool, all the blower fan will slow down and at this point of time, it does not make a difference.

But I dun see why you should do this as the 9k, 12k, 18k price is maybe just a difference of 100 and 200 bucks.

 

[flyerfox]

Is it true that the mitsubishi starmex 4G38 compressor need 32A isolator for warranty to be valid ?

 

[bunn85]

Daikin System 3 (Mks65qvmg + 3xctks25qvm) - older SMILE Series

Mitsubishi Electric System 3 (Mxy3G28Va2 + 3Xmsxyfn10Ve)

Hi, may I know if there is any key difference between these 2? Both are 3x 9K BTU and compressor is both about 6KW.

Are these 2 comparable and which is better? The price difference is quite significant.

Is is worth to spend more to upgrade to the new I-Smile series with Wifi? Thank you.

 

[scorpy81]

Thank you alphas and light84 for your kind advice.

For b) if really go for 9k BTU for living room, since take very long to cool or struggle to cool, actually it will be higher electricity bill compared to using 18k BTU? Always thought higher BTU, more electricity bill and also need more expensive higher BTU outdoor unit, so keep thinking of getting lesser BTU

 

[NeptuniaVictory]

Thank you alphas and light84 for your kind advice.

For b) if really go for 9k BTU for living room, since take very long to cool or struggle to cool, actually it will be higher electricity bill compared to using 18k BTU? Always thought higher BTU, more electricity bill and also need more expensive higher BTU outdoor unit, so keep thinking of getting lesser BTU

my 22k BTU system 1 outdoor unit cannot go higher than 12k BTU due to dust clogging, when the ambient is 30C to maintain humidity at 45% I have to set the temp on remote at 27C, the living cools down to 27C-28C BTU was around 9k.

2 weeks ago was really hot 32C I had to set 28C-29C to maintain 42% BTU, living room temp 28C. BTU at 8.5k.

last week the ambient was 24C-26C I had to set remote temp at 25C to maintain 40% humidity BTU 12k to 9k, living room temp 24C-25C, when I set temp to 26C the compressor stopped.

the lower the ambient temp I need more BTU to maintain humidity at 40%-45%.


mitsubishi

9.6k BTU consumes about 0.62 kWh - 620 watts per hour, a 9k FCU can go up to 12.9k BTU @ 0.90kWh, if the ambient is 30C you should be able to cool down living room 26C-28C it will be slower than a 18k FCU.

the 18k FCU won't stop at 12.9k, the rated is 17.6k BTU @ 1.23kWh, it will go as high as 19.7k BTU @ 1.73kWh till it reaches the set temp on the remote then lower to the required BTU to maintain temp if it's 9.6k - 12.9k BTU then the power consumption would be the same as 9k FCU.

 

[melankholy]

Anyone using starmex know how to set permanent off timer? Can't seem to find it in the manual. Need to set off timer everyday currently

 

[wongminmin]

sounds like daikin is better :x

 

[light84]

Thank you alphas and light84 for your kind advice.

For b) if really go for 9k BTU for living room, since take very long to cool or struggle to cool, actually it will be higher electricity bill compared to using 18k BTU? Always thought higher BTU, more electricity bill and also need more expensive higher BTU outdoor unit, so keep thinking of getting lesser BTU

This question hard to answer already. I suppose the electricity consumption is the same because if the amount of heat in a room is the same, the 18k only remove the heat faster den the 9k but the total heat removed is the same.

There are other ways to save electricity such as prevent excess heat from entering the room such as double glazed windows, solar films, cover all gaps between doors and windows, insulating walls etc.

 

[wongminmin]

Daikin System 3 (Mks65qvmg + 3xctks25qvm) - older SMILE Series

Mitsubishi Electric System 3 (Mxy3G28Va2 + 3Xmsxyfn10Ve)

Hi, may I know if there is any key difference between these 2? Both are 3x 9K BTU and compressor is both about 6KW.

Are these 2 comparable and which is better? The price difference is quite significant.

Is is worth to spend more to upgrade to the new I-Smile series with Wifi? Thank you.

Both are equally good, replacement parts can be easily find in the market. We buy ME cause we used them for over 15 years without any issue. While daikin is widely used in the industrial/commercial building and the app connection fit the needs of current users.

Hardly see any discounts from ME, daikin got different promos every month.
The price different is always around $200.

For ME system 3, i was advised to get MXY4G33VA2+ 3Xmsxyfn10Ve.

Currently i still choosing between these 2 brands.....hardly find any bad reviews for daikin....
i ask few tech, their reply always the same.....both are equally good for reliability, servicing and maintenance.

 

[micgoh]

what about Mitsu Heavy industry? saw their models also 5 ticks and cheaper than ME starmex

 

[Alphas]

It’s hard to judge specific brand and model as there are always problems with batches and probability of failure. If you are concern with efficiency, there is a value that determines the efficiency is the coefficient of performance (COP), Generally the higher value the better efficiency, other things like fan noise and wifi connectivity is also something to consider.

 

[MooYang]

Hi guys,

I've read through a couple of posts here but still can't decide between these 2:
1) ME Starmex System 2: MXY2G20VA2 & MSXYFN10VE(2x)
2) Daikin System 2: MKS50TVMG & CTKS25TVMG(2x)

If I will be using 2 units at the same time, can I say that the Daikin is a better choice due to a more powerful condenser?

And also maintenance and repair wise, is daikin more expensive?