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John Gochenour Posted on Jan 10, 2020
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On my compressor there is no LRA#. It says 60hz 1ph. I want to know the surge. sorry about the pm mistake, eyes

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Vernon Taylor

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  • Heating & Co... Master 7,446 Answers
  • Posted on Apr 25, 2020
 Vernon Taylor
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An LRA rating isn't usually included on motor rating plates because it is of no practical help to the end user and because the locked rotor amps or starting surge is mostly a frighteningly high figure that also is of no practical help to the end user.

If the motor specified is the right motor for the job, the starting surge current exists for such a short time it is of negligible importance.
Mostly the only time surge current is a problem is when the supply is insufficient to efficiently supply the running motor when it is working.

Here in the UK there are a number of 3HP compressors that are inexpensive enough to attract buyers with only an ordinary 13 amp domestic supply. Mostly they are only just about usable if connected directly to a power outlet but they mostly will not work if even a good extension lead is used. As a general rule a 3HP compressor needs a 16 amp supply.

5 Related Answers

Frank

  • 90 Answers
  • Posted on Aug 06, 2009

SOURCE: Need circuit board for Goodman GMNP-060-3 Rev B Furnace

Go to your nearest HVAC supply house. They should be able to get you it.

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Anonymous

  • 63 Answers
  • Posted on Aug 19, 2009

SOURCE: Equipment Available is 220v 50 hz 1ph. Supply 240v 60 hz 1ph

yes you can, just add a breaker to your box. the black wire goes to breaker and the white wire to ground. then you will have a 220v

Anonymous

  • 93 Answers
  • Posted on Mar 02, 2010

SOURCE: compressor doesn't run

check temperature control.

Anonymous

  • 78 Answers
  • Posted on May 18, 2011

SOURCE: what is LRA in compressor. whether LRA is used to

LRA is Lock rotor amps.
It is according to compressor capacity.

Healeyman

mike kirschbaum

  • 1198 Answers
  • Posted on Aug 29, 2015

SOURCE: I have a customer site 120/240V delta-wye grounded wye on the high side and delta on the low side with a high leg. I need 25kW 1ph 240v 60hz. I need a transformer for normal power 3ph to 1ph 25kW

Call an electrician who knows the difference between Delta and Wye! Delta is Dangerous!

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2answers

LRA how to convert in tonage so 10 LRA How many ton and 145 LRA Copland scroll compressor tonage value pleas give me answer

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
0helpful
1answer

My freezer has a bad EMBRACO compressor part # EGZ80HLP. Will an EGZS80HLP replace it ?

The answer to your actual question is--- check your LRA on compressor plate. If voltage hp and LRA are the same then yes. Also if you ohm the terminals on compressor place lead on any terminal and place other lead on grounded surface on cabinet. The will let you know if you a grounded compressor. If none of terminals lead to ground then it could possibly be you relay. If any more info is needed just ask. Thanks Logan
3helpful
2answers

What is the difrent between LRA and BTU ?

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
0helpful
1answer

Humming

A hum followed by a click sound is an indication of a failure at the compressor. Possibly the compressor motor has gone into a locked rotor condition. A locked rotor condition can be checked using an ammeter. The name plate on the compressor will have a rating after LRA. If the ammeter reading is equal to the LRA rating the compressor is done. If it is a reading of about 80% of the LRA (locked rotor amperage) it is possible that a relay or capacitor has failed which is replaceable.
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