Amount of Starting Current of a Rotary Compressor

A1) Between 5 and 7 times the FLC.

A2) They are the same.

The peak starting current is always the same (unless a reduced voltage starting method is used) per what PWSlack said. The only thing that changes with different loads is the acceleration time.

So was this just to satisfy curiosity, or do you have some sort of problem to solve related to that?

First of all translate 1.5 ton A.C. in kW. Second, translate it in HP.

For instance see:

http://www.rapidtables.com/convert/power/ton-to-kw.htm

Now see also at the motor shield what locked rotor code letter is written.

Check in a book-NEC Table 430.7(B) Locked-Rotor Indicating Code Letters for instance

instance- what it does means k=kilovolt_amper/hp.

Multiply 1000 with HP and with this k and divide it by sqrt(3)-for three phases

and by voltage.

Let's say the code is J then k=7.99.

1.5 ton AC=5.27 kW [ 7 HP].Voltage 480 V.

Ilocked=1000*7*7.99/sqrt(3)/480=67.27 A.

Sorry, I forgot Thermodynamics and EER!

I read the shield plate of my air conditioner and I found 4 KW.

In Europe some time "kW" does not mean output power as usually in USA, but

the input power.

That means my air conditioner of 4 kW produces about 4.30*4=17.2 kW

or 58700 BTUH about 5 ton AC. Amazing!

It is better than all my calculation, indeed!

Well we don't know the voltage....but the question was whether a compressor should be drawing LRA on start-up....I've never seen a 3Ø compressor under 5 tons...So I'm assuming single phase 230v with start/run capacitor...therefore if you are hitting LRA on start-up, you have a problem....now you can short cycle a unit in any phase or voltage and cause the unit to draw LRA trying to start against pressure built up in the system, in which case the compressor should go off on overload within something like 5 seconds...but allowing the pressures to equalize and the compressor to cool down should remedy that situation....most systems have a time delay short cycling protection on them...

Please call or go to your local refrigeration supply house, or, look up the information on the website for the manufacturer. They both have the exact info. you are looking for.

The're part sellers, not technicians...

I have worked at 2 parts houses between jobs. Don't sell them short, they have the information on hand. Some are better than others, just ask for the sharpest on the subject.

So why didn't you answer the question?

http://www.northamericahvac.com/carrier-bryant-payne-1-5-ton-scroll-condenser-compressor-p021-18211p-p021-18211/

I found this in about 2 minutes, more than enough info. for the info. needed. This is for R-22, if R-410 it's probably a Copeland.

I am not specialist in refrigeration indeed. However, something does not fit here.

18000 Btu/h it is 5.27 kW but the rated current it is not for 1 phase of 230 V .

[In my opinion has to be 25-30 A or it has to be 3 phases.]

See -for instance:

http://www.ebay.com.au/itm/AIR-COMPRESSOR-MOTOR-ELECTRIC-INDUCTION-7-5HP-5-5KW-THREE-PHASE-2880RPM-/111575009990