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#74854 - 02/04/07 12:11 PM 3 phrase hermatic refridgerant compressor
Airborne-Ed Offline
Junior Member

Registered: 01/04/07
Posts: 18
Loc: Bucks County ,Pa USA
We just got a cooling table for production that may be moved around to differant locations. What I need to know is there a way to check for direction with out using refridge gauges , such as amp draw differance between directions without recking the compressor. the condenser fans are 120 volts so I can't go by them.

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#74855 - 02/04/07 12:56 PM Re: 3 phrase hermatic refridgerant compressor
WESTUPLACE Offline
Member

Registered: 03/29/04
Posts: 252
Loc: Kingwood, TX USA
Is it cord and plug connected? If so just get a 3phase rotation meter with the same plug. Test before connecting.

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#74856 - 02/04/07 02:15 PM Re: 3 phrase hermatic refridgerant compressor
Airborne-Ed Offline
Junior Member

Registered: 01/04/07
Posts: 18
Loc: Bucks County ,Pa USA
Yes it can be cord and plug connected,but the unit is sealed no external shaft .so how would you know if it was running in the right direction with the phrase rotation meter westuplace .

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#74857 - 02/04/07 02:39 PM Re: 3 phrase hermatic refridgerant compressor
renosteinke Offline
Cat Servant
Member

Registered: 01/22/05
Posts: 5305
Loc: Blue Collar Country
First of all, talk to the manufacturer of the unit.

Taking liquid into the compressor can be a real disaster for the most common type of compressor. It is likely that the manufacturer has specific steps for you to take, in order to reduce this risk.

Indeed, having the HVAC guy empty the system prior to transport is likely a good idea in any event. An added bonus is that you can do your hook-up before the refrigerant is returned to the system.

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#74858 - 02/04/07 06:03 PM Re: 3 phrase hermatic refridgerant compressor
WESTUPLACE Offline
Member

Registered: 03/29/04
Posts: 252
Loc: Kingwood, TX USA
I assume the unit is hooked up and running now?
If so, just install a plug of the same type on the machine, on the phase meter. Use it to determine the phase rotation on the existing ckt. Note the rotation and make sure the other locations are the same. Many hermatic compressors do not care how they are hooked up, they will only pump one way.

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#74859 - 02/05/07 01:57 PM Re: 3 phrase hermatic refridgerant compressor
Airborne-Ed Offline
Junior Member

Registered: 01/04/07
Posts: 18
Loc: Bucks County ,Pa USA
Westuplace, to answer your comment ,no the unit was not running it came from another plant and found out the compressor does not work. hvac guy came out and changed the compressor and after that he told me he put a single phrase compressor in it. So it worked out better. Didn't see it yet. So thanks again for all the input Guys .

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#74860 - 02/05/07 02:42 PM Re: 3 phrase hermatic refridgerant compressor
frank Offline
Member

Registered: 05/29/01
Posts: 361
Loc: windsor ontario canada
A normal recipricating compressor will run fine regardless.A scroll wil scream bloody murder so you will know and a minute shouldn't hurt.I have installed plenty when i was a ref mach and never had a problem.If it is a scroll it may get reversed as it is moved from place to place.Scrolls are not ment to be portable if 3 phase or you will be in call-back hell.Any compressor can lock up.Wait at least 5 minutes before a restart on all ref equipment.
cheers



[This message has been edited by frank (edited 02-05-2007).]

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