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Old 18-01-2010, 08:22 AM   #1190
Senior Member
Join Date: Nov 2005
Posts: 878
Just to ask some opinion as looking to install air condition. My masterroom is around 30sm and common room is around 15sm.

From the website calculator, it seems I need around 12k BTU for Masteroom and around 8k BTU for common room.Initital I am eyeing for mitsubishi starmex but seems it is running out of stock now. GC guy introduce me toshiba

However I am having doubt on the combination:

1) RAS-4M26SACV( system 4 outdoor unit with 34k BTU), RAS-M10SKCV(9000 BTU) X2, RAS-M16SKCVX1

2) RAS-3M20SACV( system 3 outdoor unit with 24k BTU), RAS-M10SKCV(9000 BTU) X2, RAS-M16SKCVX1.

First doubt : Can RAS-3M20SACV support the second combination without any problem if I always on 3 aircond for night?

Second doubt :Is RAS-M16SKCVX1 enough for 30sm room or I need RAS-M22SKCVX1 for masterroom ?Actually the GC guy recommend me RAS-M22SKCVX1 before I get the web calculator.

Appreciate help from all expert here. Thanks
30sqm is a big room! Normal MBR maybe around 12-15 sqm. You probably need 18,000BTU or more for it.

Say if your numbers are correct (12k, 8k), if you on 3 rooms at the same time, you will need at least a 28k BTU system. If does not mean if the FCU is rated 9k BTU you will get 9k BTU. For your second option, you are only gettting 5,400BTU and 9k BTU when all 3 rooms are on at the same time. Even the first option is not able to meet your requirement whether you are using M16 or M22 FCU.
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