I called my aircon installer and he advised me when testing, don't turn on 18 deg at the start for all 3 rooms (2x common rooms and master room), because the compressor is unable to support all at once. He told me I should turn on for example the first room at 21 deg, then wait for a few mins, then turn on the second room at 23 deg, wait for another few mins, then turn on the third room at maybe 25 deg.
I'm going to test my new mitsubishi electric aircon tonight again to try out his method..
@dachee, do you mean I need to check out on this pdf regarding the cooling fins? Looks very chim sia..
or this one from GAin city?
Hi, Have a look at the gaincity mitsubishi catalogues and you will notice the following specification at the bottom of page 29:
Indoor Outdoor
(Different Indoor Model) (Different Outdoor Model)
Cooling : Upper limit 21degree C DB/15degree C WB -10degree C DB
Lower limit 32degree C DB/23degree C WB 46degree C DB
Then read the note below this table in the catalogue.
Sorry, cannot tabulate the texts above.
What the table is saying (if I am not wrong) is that at the upper limit with outside dry bulb temperature (ie normal thermometer temperature) of -10 degree C at the compressor incoming air flow, you will be able to get 21 degree C using a thermometer or 15 degree C with a wet bulb thermometer in the room (normally near the FCU) with airflow set at maximum. Similarly the reading for the lower limit and also what is written on the note below the table in the catalogue.
You may noticed that none of them indicates a dry bulb temperature of 18 degree C. And that is why I asked the question earlier whether 18 degree C is what you want because most air conditioner in Singapore if I am not wrong is unable to reach that temperature. if not wrong the system should ran for 2hours before checking.
The above are my opinion, I hope that it is useful.