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The installation manual will tell you all this. In North America with 110volts AC is normally on a dual 15 amp breaker. Your installer will set all this up.
LRA is locked rotor amps. Likely referring to your compressor. If i had to guess i would say 1.5 ton because 42 is not much. You mostly need model number to determine capacity.
LRA on the data tag stands for "locked rotor amps" and has nothing to do with tonnage. In the model # there should be a number to use. And divide that # by 12 (12,000 btu/ton). So if I had a PFG24H200 it would be the "24"and a 2 ton unit
Use a clamp on ammeter to check the LRA (locked rotor amperage) at the moment the compressor is energized. It should not exceed the rated LRA printed on the data plate. If it does then ohm the compressor for a ground or short between windings
The most important spec that you will need is the LRA rating. What this stands for is locked rotor amps. The LRA rating is what the AC unit will draw from the inverter while the compressor starts up. This is a very important spec when sizing an inverter for use with an AC unit. After you get this spec you will multiply it by the voltage and this will be the startup wattage needed by the inverter.
For example if your LRA is 60.6 amps if you multiply this by 115 you will get roughly 7000 watts at start-up. The next thing to take into consideration for a AC unit is battery bank size.Your next step in setting up a system for use with an AC unit is finding a sufficient recharge source for the batteries. You will want to have a minimum of a 150 amp alternator to recharge a system with a small AC. I do not know whether you will be able o accommodate them. Why don't you go for solar power as standby OR a small generator????????
One really has not much to do with the other directly
BTU - British Thermal Unit.- A heat measuring unit. IE:12,000 BTU (British Thermal Unit.) The amount of heat required to melt one ton of ice.
LRA - Lock Rotor Ampere-LRA is nothing but locked rotor current , generally it is located on compressors name plate, when ever pistons locked at a particular position the rotor does not move further at the time rotor draws large current, that current is located on name plate, by seeing that LRA we can know compressor rotor was locked
You should have around 120-125 volts at the outlet. If you have less than 110 volts at that one outlet, you may need to have your house wiring checked. Go ahead and call your local power company and have the power coming into your house checked at their transformer. They should do this at no charge to you.
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