Convert 240 volt outlet to 120
Posted June 11 2005 - 2:06 PM
What considerations do I have to keep in mind here?
Wire size OK going this direction? breakers? Don't bother?
Posted June 11 2005 - 4:41 PM
Itis a fairly straight conversion,but you have to do a little investigative work first,and you will have to change the breaker and the receptacle.
The first step is to identify the correct 220v breaker panel in your panel,shut it off,and to be safe shut off your main, and remove the trim cover from the panel.
When you look at the breaker it will have a current value on it probably 20 amps.This will also help determine the wire size as a 20 amp breaker will be fed with #12 wire.
This is where it gets a little tricky, in most cases the 220v breaker will have one black and one white wire attached to each pole.
If this is the case remove both wires from the breaker,and then remove the breaker from the panel. The white wire will the be relocated to the bar with all the other white wires in the panel.The black wire will be installed on a new single pole breaker of the correct amperage.
THe 220volt receptacle must also be changed to a 110volt receptacle.
After you turn the main breaker on test the receptacle for proper voltage and polarity.
Posted June 11 2005 - 8:25 PM
Posted June 11 2005 - 9:08 PM
Is the cooling effeciency/capacity of a 10,000 BTU 115 powered unit not as good as the same BTU rated unit but 220 volt powered? If so, why?
There's also lots of Energy Star rated units in 115volt, but not so many in 220volt, another reason I wanted to convert.
Posted June 11 2005 - 10:50 PM
Leave the 220 volt service in place and get a modern higher SEER AC unit that runs on 220 volts.
The 220 was put there for a reason!
Went to see the whatfixer.
Posted June 12 2005 - 9:46 AM
Posted June 12 2005 - 12:16 PM
EER or SEER numbers are ratio's of work performed vs. energy consumed.
If the unit you have / had was 10, 000 BTUH and it consumed a total of 2000 watts of power it would have an Energy Efficiency Ratio of 5. 10000/2000 = 5.
A more modern unit would have an EER number closer to 9 or 10, so if it's that 10,000 BTUH unit again and it's now only consuming 1000 watts it archives an EER of 10 (10000/1000 = 10).
Double the voltage means half the amperage but = the same in KW's at the meter and out of yer pocket.
But I'd stay with the 240 volt unit as no need to change anything and with this unit drawing half the amperage at start up, there is much less a likelihood of the lights dimming in the house at start up.
Posted June 14 2005 - 10:15 PM
Posted June 15 2005 - 8:35 AM
Originally posted by BobT:
Ed, That is a great explaination. Are the motors (fan, compressor) built a little bit beefier on the 240 volt models as well? improving unit lifetime?
If this was my house and I couldn't find a high efficiency in 240 volt or more importantly, a unit that will fit the hole, I'd be going 120 in a heartbeat .
Posted April 21 2009 - 10:10 AM
Posted April 21 2009 - 2:53 PM
10,000 BTUH A/C units are a lot easier to find in 120V compared to 240V. 10,000 BTUH seems a little small for a 400 sq. ft. room, especially if you like it cold.
Ed J is right - before you do any wiring changes, it might be easier to find an A/C unit that best fits the opening. If the new unit is 240V, great - no electrical work to do.
Posted April 21 2009 - 3:49 PM
I've always heard it's better to run at 240 v and half the amps versus wiring for 120 v (twice the amps), even though in theory both consume the same amount of watts.
Posted April 21 2009 - 4:11 PM
P = I x E
^ ohms law, half the amps doesn't mean half the heat, just twice the pressure.
Power consumption is power consumption. The running cooler is an old wife's tail. Efficiency of a motor has to do with how the motor is made, not the pressure (voltage) that feeds it.
If you want more exact info, an inductive motor is less efficient than a capacitive motor and a 3 phase motor beats them both. But this still has nothing to do with voltage.
Voltages are about the size of the wires we run, nothing more.
Posted April 21 2009 - 4:34 PM
A good Flux Capacitor beats them all
What's cooler than that Mike? SRSLY?
Posted April 21 2009 - 5:30 PM
I'll take God and guns, you can keep Obama.