2 stage cascade

[_HL4E_HalfLife_]

This will be the beast behind my 2 stage cascade system im beginning soon. R22 or Propane for stage 1 and CO2,R404,or R502 for stage 2.

[berkut]

I think she's a little too big...

[Formann]

The picture of that compressor made by back hurt

You couldn´t find a larger one?

Its a beast alright.

[runmc]

Could you point out the suction port and discharge port for us?

[Cr@sh_D1n3r]

pc ice do you mind telling me what L.R.A. means? is 71 too much ? Btw you compressor seems a bit BIG lol! that must make an insane ammount of noise but hell, I think it's gonna give you some nice results

Edit: I just saw that you compresor weight 72 LBS!!!!!!! hahaha don't drop it on the ground Suction is 1/2 and discharge 3/8.

[afireinside]

God that thing is HUGE! Just use 1HPs and safe some room/noise/electricity...

[herefishy]

pc ice do you mind telling me what L.R.A. means?

LRA = Locked Rotor Amps. That is how much current the motor will draw whne the motor is seized up (broken). Doesn't mean much of anything, actually.

The nomencalture of the model number should indicate horsepower.

****-0075-***. The numbers in the middle indicate horsepower.

0033 = 1/3 hp

[wdrzal]

LRA = Locked Rotor Amps. That is how much current the motor will draw whne the motor is seized up (broken). Doesn't mean much of anything, actually.

The nomencalture of the model number should indicate horsepower.

****-0075-***. The numbers in the middle indicate horsepower.

0033 = 1/3 hp

correct on what LRA ,stands for. but its meaning is very important that why they reserve a space for it on every motor. the circuit breaker must always be lower than this number, by a safe margin. lets look at this compressor. RLA 5.4 and LRA 31. That tells me that under max charge/load the manufacture recommends the unit not draw more than 5.4 amps. the LRA 31 tells you that is the maxium number of amps the windings can draw if the rotor locks.So the circuit breaker on this circuit needs to carry the 5.4 amps without tripping and should not be over 31 amps. a 30 amp breaker is too close to the LRA and should not be used,A good choice for this compressor is a 15 amp breaker using 14 gauge wire or a 20 amp breaker using 12 gauge wire. a 10 amp breaker on a long wire run might also trip prematurly(too light). Notice that the higher the circuit breaker ,the larger wire size must be used(smaller number).This is to be certian that the wire does not melt before the breaker trips. Each breaker/fuse size has a minium wire size requirement that corasponds with it. Walt


edit this is for primary circuit protection,if it is a branch circuit the wire size must be able too carry 115% of the LRA.

I want to expand on this a little, you must look at the application to determine if the fuseing is to protect the device or to soley protect the wiring circuit.each application needs to be looked at in its entiry. take this application ,if this comressor was on a 20 amp circuit that would protect the motor ,now lets say he adds a fan to this circuit that draws .5 amps and has a Lra of 4 amps, if this circuit is not seperatly fused or thermally protected, the wire should be able to carry 115% of the LRA so the wire will not melt if the fan becomes locked,the motor would be ruined in this example but the wireto it would not melt.

[runmc]

Good explanation walt.

So the Locked Rotor Amps is basically on the compressor to tell us what size breaker and wiring to use and nothing more?

[wdrzal]

Yes, along with the run load amps(RLA). A margin must be left above the RLA for the added resistance of the wire run plus since all motor draw many times their RLA for a split second during start-up(iductive load) to close to the RLA will cause circuit to trip at start-up. All circuit breakes have a AIC rating (amps interupt circuit) that allow it to draw many times its rated trip load for short periods so that motors can start with out tripping breaker. the RLA and LRA can be thought of as a minium and maximium circuit limits plus a margin for safty on the upper limit. I would use no less than 20% ,so for a LRA of 31 a 25 amp breaker would be acceptable but no more. Walt

[_HL4E_HalfLife_]

Could you point out the suction port and discharge port for us?

Here you go.

[_HL4E_HalfLife_]

Yep she does weigh a ton lol. I tried looking up the specs on the copeland website and i tried googling it but i can't find the specs for this compressor anywhere. any help would be appreachiated.

[REDKEN]

Yep she does weigh a ton lol. I tried looking up the specs on the copeland website and i tried googling it but i can't find the specs for this compressor anywhere. any help would be appreachiated.

Sorry this is the only thing I could find and their distributor here. Maybe you could sent them a PM or call? But didn't herefishy say it was a 1/3HP?

[wdrzal]

herefishy is right its definitly 1/3 hp ,I see if I can find the specs for this model,should have rebuild manual around too.

[_HL4E_HalfLife_]

yea redken thats what I had found too.

[Cr@sh_D1n3r]

thx for answer! I really apreciate it!

[herefishy]

So the Locked Rotor Amps is basically on the compressor to tell us what size breaker and wiring to use and nothing more?

NO! You would not want to pay for a 35Amp circuit for this compressor.

RLA = rated load Amperage. The RLA is somewhat indicative of what you would expect the compressor current to be, at the rated voltage, in the rated application. Good greif! A 35Amp circuit for a 1/3hp compressor?



NOT!

[herefishy]

I couldn't find anything on the web either... but I havbe a 1995 United Refrigeration Catalogue with this compressor's information in it. The compressor is rated R-12 high/medium temperature (from +55F to 0F).

4,900 Btu/H R-12 at 55F evaporator (at 90degF condensing temperature),

1,150 Btu/H R-12 at 0degF evaporator (at 90degF condensing temperature)


Cheers!

[herefishy]

OH!

Also, the compressor is rated low temp (0degF to -40degF) R-502, as such:

2,400 Btu/H @ 0degF evaporator (90degF condensing temperature)

440 Btu/H @ -40degF evaporator (90degF condensing temperature)

So, it is a high temp R-12/Low temp R-502 little 1/3 horse compressor.

[Coyote]

This will be the beast behind my 2 stage cascade system im beginning soon. R22 or Propane for stage 1 and CO2,R404,or R502 for stage 2.

R404 and R502 are first stage refrigerants, theres no use to have them as 2nd stage. CO2 is a problem with oil, youll have to add some propane to make oil flow.

[_HL4E_HalfLife_]

OH!

Also, the compressor is rated low temp (0degF to -40degF) R-502, as such:

2,400 Btu/H @ 0degF evaporator (90degF condensing temperature)

440 Btu/H @ -40degF evaporator (90degF condensing temperature)

So, it is a high temp R-12/Low temp R-502 little 1/3 horse compressor.

That seems a bit small for a compressor of this size and valve port openings (10mm across). Are you sure the model and serial numbers are the same? Im still looking for some technical specs such as rpm's,run cap mfd,Start cap mfd,relays,etc.

[wdrzal]

I want everyone to be aware there is a differance between protecting a circuit with the proper size wire and fuseing so it does not get hot and melt and protecting a motor or compressor from overloads.There is also a differance in wiring primary circiuts from branch circuits.There are guides for circuit protection and motor protection in the NEC(national electric code) each circumstance must be looked at induvidually.

[skate2snow]

The size as absolutly nothing to do with the power...

And the size of that beast is because of the type... a lot of displacement though...

[chilly1]

Copeland used the same body size for a number of compressors up to 1/2 hp all they do is bore it out and add bigger pistons and use a bigger motor.

[_HL4E_HalfLife_]

The size as absolutly nothing to do with the power...

And the size of that beast is because of the type... a lot of displacement though...

Yep they do these serviceable compressors have alot more displacement than sealed compressors of the same rating do thus for every revolution this compressor makes theres an increased amount of btu's.