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I have an air compressor that is driven by a Doerr (model LR22132) 2hp,3450rpm single phase electric motor. It's rated at 15 amps at 115 volts. Iwant to configure this motor to operate on 230/240 volts. It appears thatall I need to do is remove a small access plate on the back of the motor andreconnect the wires to the appropriate higher-voltage terminals. Aside fromchanging the plug, is this all I need to do, or do I need to change thestart and run capacitors as well?To power the compressor at the higher voltage, I plan to install a 240 voltreceptacle on a dedicated 20 amp circuit.
Since this circuit is intendedfor a motorized appliance, the circuit must be run directly to the outdoorservice-rated panel, not an indoor sub-panel. Is this correct?Thanks in advance. I have an air compressor that is driven by a Doerr (model LR22132) 2hp,3450rpm single phase electric motor.
It's rated at 15 amps at 115 volts. Iwant to configure this motor to operate on 230/240 volts. It appears thatall I need to do is remove a small access plate on the back of the motor andreconnect the wires to the appropriate higher-voltage terminals. Aside fromchanging the plug, is this all I need to do, or do I need to change thestart and run capacitors as well?To power the compressor at the higher voltage, I plan to install a 240 voltreceptacle on a dedicated 20 amp circuit. Since this circuit is intendedfor a motorized appliance, the circuit must be run directly to the outdoorservice-rated panel, not an indoor sub-panel. Is this correct?Thanks in advance.i got an old sears 1 hp compressor and its hooked up to 115 volts.
Youcan change it over the 230 volts by taking off the cover off the side ofthe motor(probably like yours) and there is a diagram inside the covertelling you how to move the wires around for getting the 230 volts setup. It makes no mention of changing any capacitors(i have one on thismotor). I have an air compressor that is driven by a Doerr (model LR22132) 2hp,3450rpm single phase electric motor. It's rated at 15 amps at 115 volts. Iwant to configure this motor to operate on 230/240 volts.
It appears thatall I need to do is remove a small access plate on the back of the motor andreconnect the wires to the appropriate higher-voltage terminals. Aside fromchanging the plug, is this all I need to do, or do I need to change thestart and run capacitors as well?If the motor can be converted to 240v, there will be a wiring diagramunder the access plate that tells you what wires to swap. When you areall done, make sure the motor does not run backwards! The compressorshould still work going backwards, but its oil pump won't work (if ithas one) and the fan on the flywheel will not blow the right direction.If the motor runs backwards, usually you just have to reverse the twowires you moved. Not all motors are reversable. Want to configure this motor to operate on 230/240 volts. It appears thatall I need to do is remove a small access plate on the back of the motor andreconnect the wires to the appropriate higher-voltage terminals.
Aside fromchanging the plug, is this all I need to do, or do I need to change thestart and run capacitors as well?To power the compressor at the higher voltage, I plan to install a 240 voltreceptacle on a dedicated 20 amp circuit. Since this circuit is intendedfor a motorized appliance, the circuit must be run directly to the outdoorservice-rated panel, not an indoor sub-panel.
Is this correct?Thanks in advance. I have an air compressor that is driven by a Doerr (model LR22132)2hp, 3450rpm single phase electric motor.
It's rated at 15 amps at115 volts. I want to configure this motor to operate on 230/240volts. It appears that all I need to do is remove a small accessplate on the back of the motor and reconnect the wires to theappropriate higher-voltage terminals. Aside from changing the plug,is this all I need to do, or do I need to change the start and runcapacitors as well?To power the compressor at the higher voltage, I plan to install a240 volt receptacle on a dedicated 20 amp circuit.
Since thiscircuit is intended for a motorized appliance, the circuit must berun directly to the outdoor service-rated panel, not an indoorsub-panel. Is this correct?Thanks in advance.I believe all you need to is to change the wires and the supply voltage.BTW it will then draw about half the amps it did before and many have aslight increase in performance. Why would you change it? Is it popping your breaker? If your currentrecepticle is only 15 amp, do you have another recepticle(20 amp) nearby.It's on a 20 amp circuit now and the motor draws every bit of it's rated 15amps.I haven't had a problem with the breaker tripping, since it's currentlyplugged into the one and only 20 amp dedicated circuit receptacle in thegarage. Unfortunately, this receptale happens to be in a.very.inconvenient location and I don't want to run the compressor with anextension chord, nor tie up this one receptacle for the air compressor. Ifigure, since I need to intall another receptical specifically for thecompressor anyway, I might as well make it a dedicated 240 volt circuit andconvert the motor to operate on 240 volts.Besides, the motor won't draw as much current and (hopefully) won't have towork as hard.
Power is constant. Higher volts. lower current still = sameamount of power. Workload stays the same, as does the effect onyour electric meter. Anybody told you different, they lied.You're correct, of course.My thoughts in this case were that perhaps the motor may have beenoriginally designed as a 240 volt motor, with a built-in wiring setup toaccomodate 120 volts. In other words, running it at 240 volts may be betterin that (perhaps) the motor would be operating more within it's originaldesign parameters. Of course, this is just speculation on my part.
I maypost this question to someone at Emerson Electric Co. And see what they say(Doerr is a division of Emerson, I believe).After looking more closely at the information plate on the motor, it doesshow that the motor is rated at 7.5 amps at 230 volts. Assuming nodifference in actual motor performance from 120 to 240 volts, and other thanthe new 240 volt 20 amp dedicated circuit not being maxed out amperage-wise,are there any other compelling reasons for converting to 240 volts for thisparticular application?Thanks. After looking more closely at the information plate on the motor, it doesshow that the motor is rated at 7.5 amps at 230 volts. If it were me, I'd definately go to 240V. But I would consider leaving it a 15Acircuit on 14ga because the compressor is only half of that load.
But if thecircuit is 100' or more, I'd go to 12ga (perhaps even leaving the breakers at 15A).I just reread part of this thread, and realize that the existing circuitis 20A/120V. I'd still switch to 240V. 15A breakers, unless you intendon sharing this circuit with other 240V equipment ('one man shop' rulesassume you'll be only running one tool at a time. Give provision for,say, a 3HP tablesaw, and go to 20A if you think you might need it forsomething else too.)12ga if you're leaving the circuit at 15A and the circuit is going to belonger than about 40-50'.
Besides, the motor won't draw as much current and (hopefully)won't have to work as hard.Power is constant. Higher volts. lower current still = sameamount of power. Workload stays the same, as does the effect onyour electric meter. Anybody told you different, they lied.Technically this is incorrect. The amount of power delivered to the load isthe same (P=V.I) so the motor will draw 1/2 the current at 240V than itwould at 120V. But when it comes to the 'wasted power', the 240V setupwastes less power than the 120V setup.
Doerr Lr22132 Manual
Because the 240V setup uses 1/2 thecurrent, 4 times more power is wasted when using 120V (P=I^2.R). This'wasted power' is in the form of heat in the wiring all the way back to thetransformer on the street. Also, the windings in the motor will beproducing heat. You ARE paying for the wasted power - it does show up onyour meter.
Doerr Emerson Electric Lr22132
Doerr Lr22132 3450 Rpm
However, this wasted power is so small relative to the powerconsumed by the motor, that it can be neglegable.This is where 240V helps the efficiency of the motor. As the windingstemperature increases, the resistance increases, therefore consuming morepower (therefore more power 'wasted'). Also, the life of any motor isincreased by running the motor cooler.It would be better to run this motor at 240V because you also don't have toworry about the motor unbalancing the electrical system. This occurs whenyou have too many heavy demands on one phase (I use this term to indicate180 deg out of phase, not 120 deg as in 3-phase) and light demands onanother phase. This causes a lower voltage on the 120V phase (and thus,more current consumption) that has the heavy demands and a higher voltage onthe other phase.Just my $0.02Jeff.
////I need to know what size capacitor is used on this. I have the doerr 2hp120/240v 20.4a/10.2a 3470rpm motor l22132 on an old 2 post lift, however thecap is damaged and un readable.any help is greatly appreciatedIf you google around a bit on the specs for that motor you should findsomething. Are you sure it is not on the motor label?If there is only one capacitor it is the start capacitor and they arenot really that critical.
I would try something around 500-600 on a120v motor and 130-140 on a 240v motor. Run capacitors have to be moreclosely matched.