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Air conditioning - Any recommendations please??

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Old 18-07-2016, 10:54 PM   #8206
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What brand is MHI??
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Old 18-07-2016, 11:07 PM   #8207
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Just to correct, "the 12k btu consumes 25% more electricity over 9k btu".

That statement is false.
Hi i be using Lg fcu as sample

Cooling Capacity
Min.∼Rated∼Max. (kW) 1.45 ~ 2.64 ~ 2.99
Min.∼Rated∼Max. (Btu/h) 4,950 ~ 9,000 ~ 10,200

http://www.lg.com/sg/home-air-condit...lg-AMNC09GDBA2



Cooling Capacity
Min.∼Rated∼Max. (kW) 1.93 ~ 3.52 ~ 4.02
Min.∼Rated∼Max. (Btu/h) 6,600 ~ 12,000 ~ 13,700

http://www.lg.com/sg/home-air-condit...lg-AMNC12GDBA2



the kw can be abt 33% difference btw the 2 fcu,
however i understand during the idle(or i call stable) state it can be lower so the use of 25%.

correct me if i am wrong. i am eager to learn since i also getting my own Air-con soon.
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Old 18-07-2016, 11:11 PM   #8208
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What brand is MHI??
Mitsubishi heavy industries
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Old 18-07-2016, 11:14 PM   #8209
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The operating power will of course be higher for 12k btu fcus.

But you need to consider that a 12k fcu will cool the room faster than a 9k (assuming the compressor is sufficient). That also means the 12k will work at the rated power, for a shorter duration than a 9k will. The 12k will go into idle earlier than the 9k.

So overall how does the average electricity consumption plays out? I have no concrete answer. My personal gut feeling is the 12k will consume more electricity, but no more than 10% over its 9k counterpart.

25% is too much. Considering the bulk of the energy consumption comes from heat rejection, whose rate becomes (close to) 0 once the room has reached set temperature.

10% is a generous buffer I believe. I attribute it to the extra energy consumed by the slightly larger blower motor in the larger fancoil. That's about the only difference.


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Old 18-07-2016, 11:38 PM   #8210
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Is a system 4 enough for a living room or need system 5?

ID recommend system 3+2 for both living and bed room, is that a better idea?

Normal 5 rm flat.
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Old 19-07-2016, 03:48 AM   #8211
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The operating power will of course be higher for 12k btu fcus.

But you need to consider that a 12k fcu will cool the room faster than a 9k (assuming the compressor is sufficient). That also means the 12k will work at the rated power, for a shorter duration than a 9k will. The 12k will go into idle earlier than the 9k.

So overall how does the average electricity consumption plays out? I have no concrete answer. My personal gut feeling is the 12k will consume more electricity, but no more than 10% over its 9k counterpart.

25% is too much. Considering the bulk of the energy consumption comes from heat rejection, whose rate becomes (close to) 0 once the room has reached set temperature.

10% is a generous buffer I believe. I attribute it to the extra energy consumed by the slightly larger blower motor in the larger fancoil. That's about the only difference.

IC , however better be on safer side and put 25% which is as stated in papers specification.if not ppl may get scared by the bills.

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Old 19-07-2016, 03:53 AM   #8212
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Is a system 4 enough for a living room or need system 5?

ID recommend system 3+2 for both living and bed room, is that a better idea?

Normal 5 rm flat.

depend on ur 5 room is old or new flat. the old one will need system 5. if new bto 5 room can do with system 4. however depends on layout of the living room and also if you want proper cooling. u can get MHI system 4 (1x 24k , 3 x 9k)


or MHI system 4 (1x ceiling cassette for your hall and 3 x 9k fcu for ur room.

or u can get 1 x cassette for your hall and a system 3 for your rooms.

or u can get 3+2 systems as per your ID.
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Old 19-07-2016, 08:06 AM   #8213
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How about spare parts replacement? Heard that MHI parts replacement is more costly.
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Old 19-07-2016, 06:57 PM   #8214
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How about spare parts replacement? Heard that MHI parts replacement is more costly.
Star change a pcb in compressor / fcu 500-1000.
MHI change a pcb in compressor / fcu 600-1000.

if u read other air con threads in this forum, someone did feedback ME pcb breaks down quite often
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Old 19-07-2016, 07:28 PM   #8215
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Electronics expo 2016 22-24 Jul, got quite a few good deals (including aircon, tV) from their brochures.

esp their panasonic sy-stem 2 (4 ticks i believe) $1980 with free panasonic microwave oven

good for those who wants to have 2 x system 2 for their four rooms and 5 rooms

another one is MHI system 3 (4 ticks i believe) $2690 cashback $100


*If they are 2 ticks systems m, dun bother.

Brochure here https://m.facebook.com/Electronics-Expo-117636541774482/

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Old 19-07-2016, 09:22 PM   #8216
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Electronics expo 2016 22-24 Jul, got quite a few good deals (including aircon, tV) from their brochures.

esp their panasonic sy-stem 2 (4 ticks i believe) $1980 with free panasonic microwave oven

good for those who wants to have 2 x system 2 for their four rooms and 5 rooms

another one is MHI system 3 (4 ticks i believe) $2690 cashback $100
Does hdb allow installation of 2 compressor?
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Old 20-07-2016, 12:34 AM   #8217
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Does hdb allow installation of 2 compressor?
http://www.hdb.gov.sg/cs/infoweb/res...allation-works
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Old 20-07-2016, 09:17 AM   #8218
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I thinking of installing a system 2 cos the 3rd room doesn't need a aircon cos my mum don't use it and install a system 1 should the need arise years later. Some say better to install system 3 and on it once a while to keep the parts moving.
Was thinking will be a waste of money.... Wat do the experts here think?
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Old 20-07-2016, 09:29 PM   #8219
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i not expert but sys 3 is just few hundreds more n also if u do a single sys later, u need another trunking
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Old 20-07-2016, 10:06 PM   #8220
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a few days into observing performance of my new sys3 using a Muji hygrometer. setting a lower target temp doesn't seem to lower the measured temp, but rather further decreases relative humidity to give a perceived colder feeling.

what's kinda odd is that Dry mode is able to produce cool air faster (although the auto fan speed limits itself to low & lower) than Cool mode itself.

Cool mode - 18deg + high fan = 21.8 to 23.2 w/ 41-49% RH
Cool mode - 25deg + med fan = 25.2 to 25.8 w/ 65-70% RH
Cool mode - 26deg + med fan = 25.5 to 26.3 w/ 68-75% RH
Dry mode - -1deg delta = 25.0 to 26.3 w/ 58-65% RH

Of course nothing entirely scientific, but interesting to see that dry mode (which runs quieter) performing as good as cool mode for comfortable climate settings
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