Air conditioning - Any recommendations please?? - Part 2

[zyklon86]

I have input the living and dining area sqm (40sqm) into the link provided to calculate the btu required. However, it says the btu required is only approx 10860, which means I probably only need a 9k or 12k btu. However, it doesn’t tally with what most people who own an EM do. Most people install 2 fancoils. One in the living area and another in the dining area.

And since the unit is an EM, I was told that I need to consider the fact that the dining area has a staircase which reaches to the 2nd level, which means my ceiling is not 2.6m.

In that case, how should I input the sqm? Should I divide the two areas and input the area separately ie. dining area will have a higher ceiling (approx 5.2m)?

Fan coil cannot reach so far one. One fan coil maybe only cool the 4-5m width in front of it.

Just install 1x 13,000 in dining, 1x 13,000 in living. You can choose to only turn on one when only need one.

Hot air rises, cold air sink. My staircase 2nd level is hot when downstairs on air con.

 

[zyklon86]

Anyone got quote for ME single split 13k/18k? Can PM?

 

[rerear]

Aircon leak problem has been recurring even though servicing regularly, is there any real systematic fix for this? Need to really dismantle all the pipes? Should consider changing aircon servicing firm?

 

[f1y555]

Daikin currently got 55 months warranty, is it a good promo? Other brands only one year right ?

 

[a4973]

Daikin currently got 55 months warranty, is it a good promo? Other brands only one year right ?

Could be good if it is 55 months unlimited no questions asked top to bottom warranty.

 

[The_King]

most of the big AC store only give SWG22. when i told them R32 guideline recommend 0.8 thickness for copper pipe.

all the big store salesperon most of them blackface

 

[The_King]

this swg21 or g21 is something new... daikin proshop is recommending g22 piping. Of cos thicker piping is better and less likely to have hole and leak if install correctly

yes many shop recommend swg22. and many manufacturer recommend SWG 21. i think let the buyer decide how best for them


sauce :

toshiba installation manual
Thickness of copper pipes used R32 must be more than 0.8mm. Never use copper pipes thinner than 0.8mm.
page 3: https://www.toshiba-aircon.co.uk/wp...30_R32_MIRAI_RAS-24BKVG-E_RAS-24BAVG-E_EN.pdf



Panasonic installation manual
For connection piping, use copper phosphate seamless pipes (1220T) as regulated in "JIS H 3300" and the pipe
thickness is 0.8 mm.
In the market, there are some pipes of 0.7 mm thickness, but do not use these pipes (0.8 mm thickness has to be strictly followed).
page 48: https://www.manualslib.com/manual/1175421/Panasonic-Cs-Vz9ske.html?page=48



Fujitsu installation manual
Thicknesses of copper pipes used with R32(R410A) are as shown in Table1. Never use copper pipes thinner than 0.8 mm even when it is available on the market.
page 3: https://www.energex.com.au/__data/a...Installation-Guide-R32-Refrigerant-Models.pdf



Mitsubishi starmex installation manual
Refrigerant pipes Minimum wall thickness 0.0315inch or 0.8mm
page 2: https://www.theacoutlet.com/documents/Installation-Guide-Mitsubishi-MUYGE.pdf








https://forums.hardwarezone.com.sg/...same-with-the-official-recommendation.6905232

 

[GBC]

yes many shop recommend swg22. and many manufacturer recommend SWG 21. i think let the buyer decide how best for them


sauce :

toshiba installation manual
Thickness of copper pipes used R32 must be more than 0.8mm. Never use copper pipes thinner than 0.8mm.
page 3: https://www.toshiba-aircon.co.uk/wp...30_R32_MIRAI_RAS-24BKVG-E_RAS-24BAVG-E_EN.pdf



Panasonic installation manual
For connection piping, use copper phosphate seamless pipes (1220T) as regulated in "JIS H 3300" and the pipe
thickness is 0.8 mm.
In the market, there are some pipes of 0.7 mm thickness, but do not use these pipes (0.8 mm thickness has to be strictly followed).
page 48: https://www.manualslib.com/manual/1175421/Panasonic-Cs-Vz9ske.html?page=48



Fujitsu installation manual
Thicknesses of copper pipes used with R32(R410A) are as shown in Table1. Never use copper pipes thinner than 0.8 mm even when it is available on the market.
page 3: https://www.energex.com.au/__data/a...Installation-Guide-R32-Refrigerant-Models.pdf



Mitsubishi starmex installation manual
Refrigerant pipes Minimum wall thickness 0.0315inch or 0.8mm
page 2: https://www.theacoutlet.com/documents/Installation-Guide-Mitsubishi-MUYGE.pdf








https://forums.hardwarezone.com.sg/...same-with-the-official-recommendation.6905232

A case of Caveat Emptor (Buyer Beware) ...

 

[petetherock]

The heat is on... this period is the litmus test for the compressors..
So did you buy something that's powerful enough or did you save and end up feeling the heat...

 

[devilcup]

yes many shop recommend swg22. and many manufacturer recommend SWG 21. i think let the buyer decide how best for them


sauce :

toshiba installation manual
Thickness of copper pipes used R32 must be more than 0.8mm. Never use copper pipes thinner than 0.8mm.
page 3: https://www.toshiba-aircon.co.uk/wp...30_R32_MIRAI_RAS-24BKVG-E_RAS-24BAVG-E_EN.pdf



Panasonic installation manual
For connection piping, use copper phosphate seamless pipes (1220T) as regulated in "JIS H 3300" and the pipe
thickness is 0.8 mm.
In the market, there are some pipes of 0.7 mm thickness, but do not use these pipes (0.8 mm thickness has to be strictly followed).
page 48: https://www.manualslib.com/manual/1175421/Panasonic-Cs-Vz9ske.html?page=48



Fujitsu installation manual
Thicknesses of copper pipes used with R32(R410A) are as shown in Table1. Never use copper pipes thinner than 0.8 mm even when it is available on the market.
page 3: https://www.energex.com.au/__data/a...Installation-Guide-R32-Refrigerant-Models.pdf



Mitsubishi starmex installation manual
Refrigerant pipes Minimum wall thickness 0.0315inch or 0.8mm
page 2: https://www.theacoutlet.com/documents/Installation-Guide-Mitsubishi-MUYGE.pdf








https://forums.hardwarezone.com.sg/...same-with-the-official-recommendation.6905232

Copper can corrode in certain condition. Maybe they reco thicker instead. I just thinking

 

[eting72]

currently using LG system 3 for my 4 rm flat. 2 x 9 btu, 1 x 12 btu. armflx 3/8. installed by GC since 2016.
looking at installing a unit in my living rm and maybe redoing the old pipping as there's condensation and leakage which was fixed.

any advice on what to look out for? i assume getting a different brand is not an issue? any recommended contractor?

any info will be much appreciated.

 

[Carbuncle]

1) You can get the BTU per room estimate here
https://www.calculator.net/btu-calculator.html
2) An optimal aircon system is one where the normal rated BTU on your outdoor compressor unit can support the total normal rated BTU of all your indoor units combined. What it means is that when you switch on all your indoor units at the same time, all of them can run at its rated BTU capacity without straining the outdoor compressor.

3) If your outdoor compressor unit is rated at let's say 25k btu and you have 2 x 17k = 34k btu indoor units running at the same time. What will happen is that your underpowered compressor unit can only support around 75% of the rated capacity of your 17k btu indoor unit, so your 17k btu indoor unit will only run at maybe around 12.5k btu instead of its normal rated 17k btu.

However, if you only run 1 x 17k btu indoor unit, it will run at 100% of its rated 17k btu as your 25k btu compressor unit is more than sufficient to support it.

Another alternative is to get a system 5.
System 5 compressor 44.4K BTU max MXY5H48VG

You can place 2 9k BTU in the living. 2 fan coil is able to spread and cool under space more efficiently.
9k BTU in each room.
The compressor is able to support all aircons to be on at the same time. In most of the time, probably 2-3 aircons is only on at the same time. And the compressor is running at optimal load (around 60% load). Aircons will be cold since compressor is not taxed at full load.

Another benefit is if by just using 1 system, you will be able to save electricity used when system is in stand by. 2 systems will use more electricity since 2 system are in stand by.
It might not seem a lot per month. But if it is calculated through a span of 10 years. Then the saving will be a lot.

Some will say that 2 systems is better and will last longer since it is less used.

But I will go for 1 system 5 since I will save on installation cost, additional wiring cost, electricity cost, compressor will not be running at full load most of the time. All the cost saved, can be used to replace or repair the aircon in the future.
This is my 2 cents.

Thanks GBC and anddrool! Will go and research further. Aircons are deeper than they seem!

 

[gtggtg]

most of the big AC store only give SWG22. when i told them R32 guideline recommend 0.8 thickness for copper pipe.

all the big store salesperon most of them blackface

probably easier if ask those independent installer like air connection right? since they can just go buy and install then charge you higher directly, no need go through the store sales staff

 

[The_King]

probably easier if ask those independent installer like air connection right? since they can just go buy and install then charge you higher directly, no need go through the store sales staff

most smaller independent installer no reviews, their workmanship is unknown

 

[juzzmee]

Hi,
Just want to seek advise for my 5 room resale. I’m intending to use Starmex system 3 and 2. Checked with GC and was advised the following,
4H33 x 2
3 rooms - 9/9/12
Living/Dining - 24/18
My question, is this combination of compressor suitable for the blower’s BTU? Was told that HDB cannot use 4H38 or something along the line. Can advise pls?
TIA

 

[SE4N23]

i always tell ppl this if cold i can wear more clothes, if i hot, i cannot strip naked

That's when you haven't encounter condensation, humidity and mold issues due to over sizing.

 

[simymxh]

Check PM, see if it helps

 

[simymxh]

Hi,
Just want to seek advise for my 5 room resale. I’m intending to use Starmex system 3 and 2. Checked with GC and was advised the following,
4H33 x 2
3 rooms - 9/9/12
Living/Dining - 24/18
My question, is this combination of compressor suitable for the blower’s BTU? Was told that HDB cannot use 4H38 or something along the line. Can advise pls?
TIA

Oops.. check PM to see if it helps

 

[petetherock]

Just sharing
I had a dozen friends over for bible studies, it only took 3 mins to cool my dining room
So size up your Aircon compressors well

 

[wkl1987]

Plan to buy a mitsubishi electric aircon replacing old one, system 3 for the 2 bedrooms.

can i know currently if there is any offer ? Want to buy the latest version one with 5 ticks.