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Air conditioning - Any recommendations please??

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Old 07-11-2016, 10:53 PM   #8671
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Should be kemflex.

This brand is used by Nat Aire.

If your pipings are exposed type, kemflex is sufficient. But if concealed pipings, better to use Armaflex.

Last edited by cheongking888; 07-11-2016 at 10:55 PM..
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Old 07-11-2016, 10:57 PM   #8672
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To BEWARE,

Will you be using all the 4 units @ the same time?
Most of the time will be 1 living + 2 bedrooms. 3rd bedroom will come in next few years.

Let me put my scenario over. it's a 4 room HDB new flat where i will be knocking down one of the bedroom wall to extend the living room space. this bedroom is bedroom 3. I have an open kitchen as well.

Given the setting, i could configure it as:
- living 24K
- br3 9K
- br2 9K
- MBR 12K.

or

- living 18K
- br3 12k
- br2 9K
- MBR 12K.

Either way, base on FCU rated spec, any brand will not allow me to on living + br3 + MBR at the same time.

Ok now, my question which i got different answers for different people is when i look at the spec, shuold i be looking at max capacity to configure or rated? i understand the rated is meant for NEA label but to what extend i could use the max capacity as a guideline to plan?

If by rated, i can only go for 2 systems. if by max, i could possible opt for Mit 4A38 or Daiikin MKS100 or Toshiba 5M41.


Can help to correct my understanding please?
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Old 08-11-2016, 08:26 PM   #8673
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Seems like most people here tend to go for Daikin and Mitsuibishi brand Aircon. Anybody has comments for LG brand air con? Seems like their price is slightly lower than mitsuibishi.
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Old 08-11-2016, 10:42 PM   #8674
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To BEWARE,

All brands will allow you to on all 4 units at any one time. No issues about this, just that the total btu capacity will be limited to the max btu rating of the compressor.

So if you use all 4 at the same time often, best to get the higher powered 40k btu compressor, if not, the 30k will serve you just as well if max you on 2 - 3 units at one time.

You should be looking at the max capacity instead of the rated capacity.
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Old 09-11-2016, 12:42 AM   #8675
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To BEWARE,

All brands will allow you to on all 4 units at any one time. No issues about this, just that the total btu capacity will be limited to the max btu rating of the compressor.

So if you use all 4 at the same time often, best to get the higher powered 40k btu compressor, if not, the 30k will serve you just as well if max you on 2 - 3 units at one time.

You should be looking at the max capacity instead of the rated capacity.
Thanks terumo. This is very helpful. I was reading up the datasheet and noticed that cu will allocate a predefined value to a certain set of configuration.

For example taking York CU YCHMYC028 with 12K + 18K configuration. The total FCU BTU with this config is 30K while the CU output only 26.7K when the max is suppose to be at 31k. Looking further datasheet, as this is a system 4 CU, only when utilizing all 4 FCU, will push the CU to the limit. Any idea why is this so? I mean, why cant the CU just allocate the max possible to any config?

Another question would be room sizing. I have been to Daikin proshop and check out my floor plan. Say one of the area is 322sqft which is rectangular in shape with a height of 2.65m. I was told i need a 22.xK BTU FCU. when i check out most of the website, it states i would need merely 12K or less. Adding more people (600BTU/pax) or adding on the kitchen area (which i need to as i have hacked down the wall) will still stay well below that 22K suggested.

Base on your knowledge, how can i best judge and size it correctly with the fact that sometimes there will be open and close doors, sometime between 6 to 12 pax, north-facing hence, considered normal, etc.

Pardon me for my long message as i believe im very near to buying the correct Cu capacity and correctly size my flat up for proper configuration.
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Old 09-11-2016, 06:56 PM   #8676
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Need some advice, for me, heavy user, 3 bed room on every night and living room occasionally.

I decided to go with ME system 4 for my new house. 2 ticks 4A38VA compressor and 9k for 2 bedroom and 12k for master and 18k for living. One of my Aircon guy quoted me $4.4k for armaflex class 0 1/2" insulation, 22SWG copper pipes, 16mm drainage pipes, keystone cables and 2 trip install, which I find, is reasonable.

Then when I ask him how much for the 5 ticks 4G38VA version same btu config (FJ series) for rooms, he like very reluctant to quote me, and just tell me $6500 for the 5 tick version which is think is BS and he just anyhow pluck number from thin air one.. why ah? 2 tick profit margin higher issit?
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Old 09-11-2016, 09:13 PM   #8677
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To BEWARE,

For the area mentioned, 18k btu should be sufficient, but to be on the safe side, you can take 22k btu.
No harm to upsize one level up for BTU.
It actually makes it more efficient (saves energy) and cools down the area much faster.

For example taking York CU YCHMYC028 with 12K + 18K configuration. The total FCU BTU with this config is 30K while the CU output only 26.7K when the max is suppose to be at 31k. Looking further datasheet, as this is a system 4 CU, only when utilizing all 4 FCU, will push the CU to the limit. Any idea why is this so? I mean, why cant the CU just allocate the max possible to any config?
The data sheet is based on nominal rating, thus you can just take that as a guideline will do.
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Old 09-11-2016, 09:16 PM   #8678
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To MoDiE,

The 4a38 is useful if you use all 4 units at the same time, if only 3 rooms are used most of the time together, 4a28 (30k btu) will serve you well enough.

$4.4k is reasonable, though a bit on the high side (my own views)
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Old 10-11-2016, 09:57 AM   #8679
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I went to gain city, and I asked about their workmanship.. esp. if they will squeeze 2 copper pipes into one insulation.. the salesman said they will squeeze both the liquid and gas copper pipes into one insulation and that this is the standard practice. Is this true???
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Old 10-11-2016, 06:33 PM   #8680
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I went to gain city, and I asked about their workmanship.. esp. if they will squeeze 2 copper pipes into one insulation.. the salesman said they will squeeze both the liquid and gas copper pipes into one insulation and that this is the standard practice. Is this true???
Two cu pipes into one insulation is usually at the FCU. Thereafter is usually one to one unless the trunking is too small to accommodate then they will squeeze 2 into 1.

My office partitions are too narrow. Hence no choice, 2 into 1.
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Old 10-11-2016, 07:18 PM   #8681
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Two cu pipes into one insulation is usually at the FCU. Thereafter is usually one to one unless the trunking is too small to accommodate then they will squeeze 2 into 1.

My office partitions are too narrow. Hence no choice, 2 into 1.
I'm afraid it may lead to condensation as I understand that one of the copper pipes is warmer and one is colder..
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Old 10-11-2016, 10:04 PM   #8682
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To MoDiE,

2 in 1 insulation is not a standard or normal practice.
Its best for the 2 pipes to be in different insulation.
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Old 11-11-2016, 09:45 AM   #8683
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I went to gain city, and I asked about their workmanship.. esp. if they will squeeze 2 copper pipes into one insulation.. the salesman said they will squeeze both the liquid and gas copper pipes into one insulation and that this is the standard practice. Is this true???
Water pipe never need insulation leh... Squeeze into 1 trunking - yes. Not insulator only for cu pipe.

Gain city - after so many year still never change its spot. Come to difficult question - throw smoke bomb...

hahaha... u suay just kana smoke by a newbie who knows nothing abt AC. But the installation and product at GC is reliable. I wouldn't say much for their SM thou.
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Old 11-11-2016, 04:53 PM   #8684
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Water pipe never need insulation leh... Squeeze into 1 trunking - yes. Not insulator only for cu pipe.

Gain city - after so many year still never change its spot. Come to difficult question - throw smoke bomb...

hahaha... u suay just kana smoke by a newbie who knows nothing abt AC. But the installation and product at GC is reliable. I wouldn't say much for their SM thou.
I think you misunderstand. Aircon 101, There are 3 types of pipes:

Liquid (refrigerant) copper pipe (outdoor unit to fcu)
Gas copper pipe (fcu back to outdoor unit) and
Drainage pipe pvc for water drainage.

And all of them needs insulation.. I'm asking is if it is ok to squeeze the first 2 into 1 insulation... for pvc pipe no insulation at the drainage area near toilet is ok one


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Last edited by MoDiE; 11-11-2016 at 04:56 PM..
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Old 12-11-2016, 12:11 AM   #8685
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Hi, I'm looking to upgrade my existing air conditioner. But need some bro here to recommend right place to look for quotation / buy aircon. I know popular choice is like gain city but seems like they always on a higher pricing side. From here, I saw mostly said that Mitsubishi Electric starmex FJ series is good. Other than this model any recommendations too?
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