charleskerins Posted April 18 Share Posted April 18 Planning on switching out 12,000 BTU to 18,000 BTU there is 30 amp box dedicated to the 12,000 BTU. My Thai friend wants to install the old 12,000 BTU in the back of the rental I said I don't think you have enough electric power "Listen to me darling we have plenty (electricity ) I know . 14 M's WTH is a M? TIA Link to comment Share on other sites More sharing options...
digbeth Posted April 18 Share Posted April 18 25 minutes ago, charleskerins said: Planning on switching out 12,000 BTU to 18,000 BTU there is 30 amp box dedicated to the 12,000 BTU. My Thai friend wants to install the old 12,000 BTU in the back of the rental I said I don't think you have enough electric power "Listen to me darling we have plenty (electricity ) I know . 14 M's WTH is a M? TIA Probbaly amps, best to look at your meter to be sure Link to comment Share on other sites More sharing options...
charleskerins Posted April 18 Author Share Posted April 18 2 minutes ago, digbeth said: Probbaly amps, best to look at your meter to be sure you are correct amps! Link to comment Share on other sites More sharing options...
NorthernRyland Posted April 18 Share Posted April 18 I just did this very same thing and they had to run a new line directly to the breaker box and abandon the old switch on the wall which was routed to a nearby outlet. HomePro said this was there policy which is good enough for me. Link to comment Share on other sites More sharing options...
charleskerins Posted April 18 Author Share Posted April 18 (edited) 20 minutes ago, NorthernRyland said: I just did this very same thing and they had to run a new line directly to the breaker box and abandon the old switch on the wall which was routed to a nearby outlet. HomePro said this was there policy which is good enough for me. May I ask how much they charged to do it? The present AC is hardwired into a 30 amp box so the new one can wired into that but the old one in the back will need a new breaker and i don't know if she has enough power. Edited April 18 by charleskerins Link to comment Share on other sites More sharing options...
KannikaP Posted April 18 Share Posted April 18 (edited) I was told as a rule of thumb, that a conventional, old style 18000 BTU a/c takes 1800 watts when running, which is about 8.2 AMPS. It can take double that to start up, so 16.5 amps maximum.. Inverter models do not need the high current to start up. Your 30 amp breaker should be plenty. The breaker is there to protect the wiring, not the a/c. Edited April 18 by KannikaP 1 1 Link to comment Share on other sites More sharing options...
NorthernRyland Posted April 18 Share Posted April 18 1 hour ago, charleskerins said: May I ask how much they charged to do it? The present AC is hardwired into a 30 amp box so the new one can wired into that but the old one in the back will need a new breaker and i don't know if she has enough power. 1300 from HomePro in Chiang Mai but there was a cost for an extra stand also since we raised it off the ground compared to the old machine. Link to comment Share on other sites More sharing options...
charleskerins Posted April 18 Author Share Posted April 18 1 hour ago, NorthernRyland said: 1300 from HomePro in Chiang Mai but there was a cost for an extra stand also since we raised it off the ground compared to the old machine. thanks ! Link to comment Share on other sites More sharing options...
bluejets Posted April 18 Share Posted April 18 19 hours ago, KannikaP said: It can take double that to start up, so 16.5 amps maximum.. Actually, older style compressors, motors what have you, can take 4 to 6 times full load at startup. This is an instantaneous value BUT if the motor doesn't have access to enough current from the supply, (more often than not due to cabling being too small and creating large voltage drop) they will sit on the start winding, never get going properly, and burn out. 1 Link to comment Share on other sites More sharing options...
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