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Air conditioning - Any recommendations please??

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Old 18-12-2012, 05:45 PM   #3151
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Piping if there is no leaking (gas) and water condensation issues, i feel that you can use back.

MHI n Panasonic, I prefer Panasonic in terms of price/quality.
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Old 18-12-2012, 08:32 PM   #3152
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thanks for the reply.


i will get the Panasonic since almost all system 2 inverter are almost around 2k to 2.2k
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Old 20-12-2012, 06:07 PM   #3153
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Hi all, hope someone can comment about my problem.

I just replaced my Mit System3 (aft 6yrs) with a Daikin 3MKS71ESG & 3 FTKS25DVM 9k FCUs yesterday.

In both systems, i opted for R410a and Inverter models.
As such i believe the performance should be similar.

However, i was running the unit the whole of last night, my wife and I noticed that the air wasn't as cool as our old Mit.
I placed my hand infront of the blower, while the wind felt cool, it did not feel the same.

We tried to set the same operating temp - 24 and 3fans.
Closed the door for an hour before going in.
With my old Mit, i would get a gush of cold air as i open the door. With the Daikin, i dont get such an effect.
This morning, we really felt the room wasn't as cold as it should be after a night.

Thus im now trying to get my installer to troubleshoot the problem, to see if there is a leakage that cause the compressor not able to run fullspeed? or someother causes...?
The tech told me that if there was a leakage, the Daikin unit would blink, however mine did not.
Im reluctant to set the temp to below 24 as i always been using 24-25 which was good enough, might be wasting electricity in the long run if i set lower just to compensate.

I understand cool sensation is subjective - but i just want some hardproof results to show that the new unit is working properly.

Does anybody know how i can verify this with the installer?

Thanks!
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Old 20-12-2012, 10:33 PM   #3154
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To alantcy,

Get Daikin to come and check since its under warranty.
Actually, i believe your new system is in normal working condition, the reason why you don't feel as cold as before is due to the Daikin unit is new thus better efficiency, once reach 24 degrees, compressor runs @ low speed/part load or cut off.


Actually 24-25 is not very cold, just a comfortable temp for us to sleep.
For the feeling of coldness, i think a temp setting of 21-23 will be able to give you that kind of feeling.
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Old 20-12-2012, 10:52 PM   #3155
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Hi terumo, thanks for your reply.

So i managed to get the installer to come back and check.
They showed me that the system's total current is 8.4A indicated on the outdoor panel. So when we turn on 1unit, the ampere reading was 2.96ish. We then turn on all 3 units and the amp reading climbed to 8 sometimes hitting 9A.

The R410a pressure was 120psi when we started the 1st unit then slowly climb to around 148psi after we turned on all 3 fcus.

He then used a laser pointer temperature reader to check the
FCU temp. At 24 setting, the temp measured started at 23 deg and went down to 20 after few mins. We then lowered the temp from 24 to 20 and it reported 19. I then ask him to set at 18 and we finally able to achieve 16 at the coil.

He showed me moisture (sweating) forming from the outdoor unit. He also told me that different brands of aircon blow out air choppy vs smooth so we might experience it as stronger or weaker airflow.

So in summary, he advised me to try setting at 21 instead of sticking with 24 and see if it improves. if not i can request for daikin engineers to come down to verify and write a report of the system.

Im still debating if i should call Daikin to come down and verify. Warranty card havent sent yet.
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Old 22-12-2012, 12:20 AM   #3156
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Off coil temp for 9k btu fancoil unit with the door closed should be able to achieve 13-15 degree within 10 mins.

If your off coil can achieve 16 as u mentioned, then your room temp should be ard 26. There is usually a 10 degrees difference between ur off coil and the room temp.
So if room is 24, off coil is around 13-15 degrees.

Last edited by terumo; 22-12-2012 at 12:23 AM.. Reason: Typo
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Old 22-12-2012, 01:40 AM   #3157
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Hi terumo.

Can i know do system 2 Inverter models have 2 compressor now? if they do, how do i check it?

and also which system 2 Inverter air con brand is best for quality and durability without giving problem if they air con is maintain every 3 to 5 month?

thanks a lot
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Old 22-12-2012, 09:02 AM   #3158
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I just bought a Fujitsu System 3 Inverter from Courts. Hope its as good as my old Starmex non-inverter.

Price came with all pipings and 5 year extended warranty...
wah.. my Fujitsu inverter outdoor unit spoilt within first 3yrs. paying $3600 for everything last time.. den repair cost for the outdoor unit cost another $900...

so decided to scrapped everything and move to Daikin non-inverter.. till now not much problem.
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Old 22-12-2012, 10:20 PM   #3159
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To the_king,
All inverter system uses single compressor now. Only non-inverter have 2/dual compressor system.

For sys 2 invertor, i will suggest Mit Electric/Panasonic due to quality and value for money.
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Old 22-12-2012, 10:41 PM   #3160
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A colleague and I were chatting about air-con and so happens we are both using Mitsubishi so we were talking about settings.

His fan speed is always 3 which is the max (1 is minimum) and his temperature is about 26 degrees. He claims that the fan speed must be high if not will have "condensation". But because fan speed is max so he sets it to 26 degrees if not he said he will find it too cold if fan speed 3 and is 25 or 24 degrees.

I spoke about this to a relative and she has the opposite to say. She claims that fan speed should not set to max if not fan will spoil very fast and that is when you will hear the rattling noise. According to her, fan speed should set at medium (I guess that's 2 for Mitsubishi) and if its too warm should lower the temp to 24, 23 or even 22 degrees.

Now I'm confused. Who is correct? Is it true if fan speed set to max it will spoil faster? Or is it true if fan speed set too low will have condensation?

And what is the best combo? High fan speed with warmer temp? Low fan speed with colder temp? Or high fan speed with colder temp? I don't want my room to freeze but then again if I can't feel the cold air, then what's the point of an air-con in the first place.
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Old 23-12-2012, 02:10 AM   #3161
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To the_king,
All inverter system uses single compressor now. Only non-inverter have 2/dual compressor system.

For sys 2 invertor, i will suggest Mit Electric/Panasonic due to quality and value for money.

thank you for the advise.

can i ask you one last thing?

i ask court today he told me for their extended warranty for the circuit board cover only 3 year and the rest of the parts cover 5 warranty as in 1+4 warranty. the saleman also told no company can provide a 5 year warranty(extended warranty) on the circuit board. not sure how true is this

i when over to gain city. they told me their circuit board and all other parts for aircon cover 5 year(as in extended warranty). but i ask them to show me the T&C( circuit board) he is unable to show me and keep insisting the circuit board have 5 year warranty?

can advise on this?


thanks a lot for all the help and advise

Last edited by The_King; 23-12-2012 at 02:15 AM..
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Old 23-12-2012, 05:18 PM   #3162
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The 5 years extended warranty is very grey.
Make sure u read the terms & conditions.
They might be able to cover all parts but need you to sign a service package with them, if not the warranty will be void.

They can charge slightly higher for the servicing in order to cover back for any faulty parts within the 5 years.
So its works out to the same too... and some luck involved too. (IMO)
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Old 23-12-2012, 09:04 PM   #3163
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A colleague and I were chatting about air-con and so happens we are both using Mitsubishi so we were talking about settings.

His fan speed is always 3 which is the max (1 is minimum) and his temperature is about 26 degrees. He claims that the fan speed must be high if not will have "condensation". But because fan speed is max so he sets it to 26 degrees if not he said he will find it too cold if fan speed 3 and is 25 or 24 degrees.

I spoke about this to a relative and she has the opposite to say. She claims that fan speed should not set to max if not fan will spoil very fast and that is when you will hear the rattling noise. According to her, fan speed should set at medium (I guess that's 2 for Mitsubishi) and if its too warm should lower the temp to 24, 23 or even 22 degrees.

Now I'm confused. Who is correct? Is it true if fan speed set to max it will spoil faster? Or is it true if fan speed set too low will have condensation?

And what is the best combo? High fan speed with warmer temp? Low fan speed with colder temp? Or high fan speed with colder temp? I don't want my room to freeze but then again if I can't feel the cold air, then what's the point of an air-con in the first place.
Previously owned a Mit but the max fan speed is actually 4.
I usually it at set 2, but even at that speed, the fan got super noisy over the years.
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Old 24-12-2012, 12:16 PM   #3164
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Previously owned a Mit but the max fan speed is actually 4.
I usually it at set 2, but even at that speed, the fan got super noisy over the years.
The thing is, does using a lower speed help to lengthen the time before the fan makes noise?
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Old 24-12-2012, 07:14 PM   #3165
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Fan speed if set low will cause condensation esp when your fancoil is dirty (lower airflow rate)

Best (Imo) is higher fan speed for better air distribution and temp as per your required (23-25 is cooling enough for most people)
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