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Air conditioning - Any recommendations please?? - Part 2

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Old 17-09-2020, 12:55 AM   #5446
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If u want to switch all 5 at once, u have to get system 3+2. System 5 cannot switch all at once. Not enough power to support all 5.
System 5 is for those place with space constraints for the compressor.
Thanks, Craig! The Daikin system 5 MKS90TVMG is 29K BTU (with maximum BTU up to 43K), does it mean I could assume it could power my units till a total of 43K BTU?
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Old 17-09-2020, 01:39 AM   #5447
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Yeah definitely but do you know what are the latest model numbers please?
I don't know which the new equivalent models are eg in the Daikin iSmile range
Daikin ismile series latest model is ending with TVMG. With wifi.
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Old 17-09-2020, 01:41 AM   #5448
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Thanks, Craig! The Daikin system 5 MKS90TVMG is 29K BTU (with maximum BTU up to 43K), does it mean I could assume it could power my units till a total of 43K BTU?
Yes, able to provide u maximum output of 43k btu.
Do note that u can’t run it at max all the time.. too stress for the compressor.
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Last edited by craigchua; 17-09-2020 at 01:47 AM..
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Old 17-09-2020, 10:57 AM   #5449
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Hi AC gurus,

any recommendation to get Mitsubishi aircon system 3
payment method by installment from reliable company with good installation workmanship

Thanks
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Old 17-09-2020, 10:41 PM   #5450
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Hi AC gurus,

any recommendation to get Mitsubishi aircon system 3
payment method by installment from reliable company with good installation workmanship

Thanks
Courts flexiplan
Gaincity need to tallk to the salesperson .

Sent from Xiaomi MI 9T PRO using GAGT
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Old 18-09-2020, 01:33 AM   #5451
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Hi AC gurus,

any recommendation to get Mitsubishi aircon system 3
payment method by installment from reliable company with good installation workmanship

Thanks
Just compare pricing from the bigger players. ie Gain City, Audio House, Courts, Best Denki, etc.

Mine was installed by GC 10.5 years ago. I am still using the same piping and wiring even though I changed from MHI to ME recently.

I know at least 3 of my neighbors who need to redo their piping and wiring again.
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Old 18-09-2020, 07:37 AM   #5452
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Hi.
When the air con ppl say 1/2” insulation, does it apply to all the pipes? I i just had my AC installed, and there are two gas pipes, and one water outlet pipe.
So should the 1/2”’insulation be for the water pipe and BOTH the gas pipes?
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Old 19-09-2020, 08:52 AM   #5453
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The science behind max and rated colling capacity is this.

Max cooling capacity is what supplier claim

Rated cooling capacity is the true operating cooling capacity. Why rated cooling rate is the true operating cooling capacity? It is because the outdoor unit can only provide 29k cooling capacity when it tried to cool room to 27 deg from an external temp of 35 deg. Basically rated cooling capacity is obtained by going thru a standard test.

The higher the outdoor temp, the lesser rated cooling capacity is provided by the outdoor unit. Similarly, the lower temp u want for your room, the lower the rated cooling capacity.

A lot of time 25 deg is very cold. Why did people set 25 deg and don't feel cold? It is because they misunderstood that the lower temp u want, the lesser cooling rate provided by outdoor unit. So if only 1 indoor unit is turn on. Usually no problem. If many indoor units are turned on and fighting for cooling capacity from the outdoor unit. Then, no matter what temp u set. It won't be cold.

That why, most of the time, people ask how many indoor units are turned on at one time. Then, set temp to 25 deg. Stagger the turn on of indoor units. Get 2 outdoor units. All these help to ensure the outdoor units have sufficient cooling capacity for the indoor units.

There is this Daikin System 5 (MKS90TVMG). I am looking at 18k/12k/9k/9k/9k

1) May I check if this is sufficient to support all 5 unit switched on at the same time? The DAIKIN MKS90TVMG is 29K BTU (with maximum BTU up to 43K), so does it mean i could assume the compressor can perform up to 43K instead of 29K?
2) Such System 5 is cheaper than a Sys 3 + Sys 2. Should i take System 5 instead since it's cheaper or Sys 3 + Sys 2 is a better option?
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Old 19-09-2020, 09:00 AM   #5454
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A simple way to calculate is divide the area by 5

For example. 9.95/5 = 2kW.which is about 7k btu

Living room + open kitchen = 37/5 = 8kW. which is 28k BTU. There many configuration for this but I recommend 18k x 2.

MBR. 15k/5 = 3kW.which is 12k BTU

Cheapest.
Find 2x outdoor unit with 21k rated cooling capacity each.
Pair 1 x 18k with each outdoor unit. Don't cooect both 18k to one outdoor unit

Best cooling experience
Find 2x outdoor unit with 25k rated cooling capacity each.
Outdoor unit 1: 18k + 12k
Outdoor unit 2: 18k + 9k +9k

Dear AC Specialist,

what BTU should I consider for my 4room flat with afternoon Sun

Living Room with Open Kitchen (O.K)37m2
Main Br 16.8m2
Bedroom 1 9.95m2
Bedroom 2 9.30m2

Went to TAI WAH and the auntie said we can consider Sys4, 9,9,12,18.
Walk down to Geylang Daikin showroom, the salesman ask us get Sys4, 9,9,12,20.
On my facebook sms one quotation a shop near Eunos having sure win lucky draw, prizes like vaccum cleaner, ceiling fan, etc..... whatsapp them my floorplan and recommend me go 9,9,12,24.

Got no preference for brands, just wanna see which BTU to go for for my Living room right now.

However we might go for Mitsubishi because of the easy wash.


LOVE to hear your views.
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Old 19-09-2020, 09:09 AM   #5455
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What is your ceiling height?

Simplest way of calculating is area divide by 5 give u the kilowatt. Multiply kilowatt by 3412 give u the btu.

Master bedroom 13 sqm = 2.6kW
Guest bedroom 12.5 sqm = 2.5kW
Baby bedroom 5 sqm = 1 kW
Living room + Corridor 27.8sqm = 5.56kW

Recommendation.
MBR = 12k BTU
Guest room = 9k btu
Baby room = 9k Btu
Lviing room = 18k btu / 21k btu

Cheapest method.
Get 1 x 25k rated cooling capacity capacity outdoor units

Best cooling method
Get 2 x 21k rated cooling capacity outdoor units
Outdoor unit 1: 18k + 9k (guest room)
Outdoor unit 2: 12k + 12k (additional for Lviing room) + 9k (baby room)

If no budget.
Go for 2x25k rated cooling vapacity
Outdoor unit 1: 18k + 9k
Outdoor unit 2: 18k + 12k + 9k

Am moving into a resale condo next year and all the existing Daikin's and piping will be replaced as we're going to renovate.

Master bedroom 13 sqm
Guest bedroom 12.5 sqm
Baby bedroom 5 sqm
Living room + Corridor 27.8sqm

Current installed units:
1 x RKS35GVMG & 1 x FTKS35DVM
2 X 3MKS71ESG to 1 x FTKS35DVM & 1 x FTKS50FVM

I know the Master bedroom has its own compressor (RKS35GVMG) while the each other bedroom has its own single compressor shared with one living room blower each (ie two system 2's).

a) Can you suggest replacement new models (Daikin & Mitsubitshi) for these please? Prefer wifi instead of old fashioned remote control.

Our ID suggested just two compressors with a system 2 and system 3 but as we use a/c frequently and we stay in the same condo already in a different unit with same setup, we found out why it's useful to have 'redundancy' by not sharing the same compressor.

b) Have you seen a/c companies able to give decent guesstimates based using the above stats? Or do you need to give more info?

c) which BTU calculators do you use? See varying results so cannot get a good guide.

TIA
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Old 19-09-2020, 09:11 AM   #5456
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Your quote is too expensive.

Have been quoted these from renovation ID:


Cannot find how new these products, are they latest or not?

DAIKIN SYSTEM 2 AIRCON MKS65QVMG- 1 x CTKS35QVM, 1 x CTKS50QVM
DAIKIN SYSTEM 3 AIRCON MKS65QVMG- 2 x CTKS35QVM, 1 x CTKS50QVM

Also price include installation, exclude GST.
$8343.40 - is this price ok?
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Old 19-09-2020, 09:34 AM   #5457
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This happens for starmex only. I felt they are rather not transparent in telling consumer what they really need to know. They prefer to highlight the max btu instead of rated btu.

I guess the only reason is consumer don't understand how an outdoor unit really works. So the more they explain, the more consumer will be confused.

Furthermore starmex seller tends to create this illusion that my system 3 or 4 is cheaper than daikin. Why I say an illusion is because their system 3 or 4 tends to be powered by a lower rated cooling capacity, compared to daikin, which is not comparing apple to apple.

It really depends on the room size though. For the small-ish BTO room, 6K BTU should be more than sufficient. One notable thing is that the rated capacity with 5-tick units for condensers can be quite far off from what the model name suggests.

Pairing 2x FN10 + 1x FN13 with the 3G28/33 would be severely underpowered if all 3 switched on at once.

FN07 = 6.8K BTU
FN10 = 9.5K BTU
FN13 = 11.9K BTU
FN18 = 17K BTU
3G28VA2 = 20.4K BTU
4G33VA2 = 22.5K BTU
4G38VA2 = 25.2K BTU
5G48VA2 = 31.3K BTU
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Old 19-09-2020, 01:23 PM   #5458
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Your quote is too expensive.
Have been quoted these from renovation ID:


Cannot find how new these products, are they latest or not?

DAIKIN SYSTEM 2 AIRCON MKS65QVMG- 1 x CTKS35QVM, 1 x CTKS50QVM
DAIKIN SYSTEM 3 AIRCON MKS65QVMG- 2 x CTKS35QVM, 1 x CTKS50QVM

Also price include installation, exclude GST.
$8343.40 - is this price ok?
Expected. Renovation ID quote is normally = aircon subcontractor quote + ID %markup.
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Old 19-09-2020, 03:34 PM   #5459
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Hi.
When the air con ppl say 1/2” insulation, does it apply to all the pipes? I i just had my AC installed, and there are two gas pipes, and one water outlet pipe.
So should the 1/2”’insulation be for the water pipe and BOTH the gas pipes?
1/2” insulation is only for copper pipes, 3/8” is for drainage or condensate pipes.
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Old 24-09-2020, 10:30 PM   #5460
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Talking

Hi There!

Wish to seek some advices which one should I choose based on the following quoted brands and model below?

======================
Daikin Ismiles Series 5Ticks

MKS50TVMG (Outdoor unit)
CTKS25TVMG X 3 (Indoor Unit)
9k, 9k, 9k BTU - $2750nett
System 3

Installation with Full Upgraded Materials as below:
✔22g copper piping
✔Keystone wire (local brand)
✔1/2 inch class 0 armaflex
✔16mm drainage pipe with insulation
✔SINGAPORE CERTIFIED TRUNKINGS

Warranty
✔ 5years compressor by Daikin
✔ 1year fancoil by Daikin
✔2 years workmanship

* Additional charges may apply if piping longer than 15 meters*
Remove and dispose of existing aircon units are FREE!!

--------------------

Mitsubishi Starmex 5Ticks

MXY3G28VA2 (Outdoor unit)
MSXYFN10VE X3 (Indoor Unit)
9k, 9k, 9k BTU - $2950nett
System 3

Installation with Full Upgraded Materials as below:
✔22g copper piping
✔Keystone wire (local brand)
✔1/2 inch class 0 armaflex
✔16mm drainage pipe with insulation
✔SINGAPORE CERTIFIED TRUNKINGS

Warranty
✔ 5years compressor by Mitsubishi
✔ 1year fancoil by Mitsubishi
✔ 2 years workmanship
======================

It is based on 5rm HDB flat (Approx. 135sqm). I'm intending to install 3 Aircon units mainly in 2 Bedrooms + MBR. I can't attached the floorplan here since I'm new to this forum.

Wondering is the pricing above is it ok? Is the above quoted BTU models sufficient? My usage wise (8-10hrs a day) is only using at night before bedtime. All 3 rms will switch on the aircon though usually will not be the same timing as there's interval in between the other.

I'm intending to change my current faulty old Mitsubishi Starmex (12yrs+ old) due to refrigerant leaking. Time to change unfortunately. I'm leaning towards getting Daikin for a change though Starmex is also a great close contender.

Looking forward in your advice!
Thanks!
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