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pipefighter
07-09-2011, 02:09 AM
Hello everyone, this is my first post. Hopefully I have put this in the right section, if not, please redirect me.

Here is my question -- I am doing start up on a Hussmann Protocol for a smaller sized market. I have started these up before, but they used to use contactors for the electric defrost from the CPC boards for the coils. Now they are using a new technology I have not seen before. It is called Powerlink, and it looks to be switching polarity to run the defrost, I could be way off, I am really not sure.

Was hoping someone has had some experience with this.

Thanks,

Ryan

750 Valve
07-09-2011, 09:44 AM
Hope this helps.

ELECTRIC DEFROST
2. When the defrost relay is energized the POWERLINK™ breakers will receive a momentary charge or pulse from a capacitor in its POWERLINK™ Power Supply (PPS). The energized motor moves a push/pull rod similar to what might be found in a manual switch. A slight delay between the control circuit demand and the POWERLINK™ response will be noticed. This pulse switches the POWER- LINK™ such that the heaters are now energized. At the termination of defrost, the PPS will receive another pulse, causing the POWER- LINK™ to switch off.

simon@parker
07-09-2011, 06:57 PM
not answering yr question but a question to 750 valve this power link from a capacitor does it pre charge the heaters so there is no voltage drop and less of an amp surge to the heaters when they start ? or does the capacitor charge and then when heaters are hot does it maintain the heater until the defrost finished so you dont have a large energy usage on heaters ? love the signature lol

Brian_UK
07-09-2011, 10:55 PM
Hussman manual has some detail/diagrams in section 4-21, page 55 of this pdf file...

http://www.hussmann.com/Discontinued%20Tech%20Info/Protocol_Discon_im.pdf

chillerman2006
08-09-2011, 12:31 AM
Off topic - needed removing

simon@parker
08-09-2011, 07:51 PM
thanks brian its all clear now its a very complicated 2 second time delay switch with extra posh low voltageness i worked for hussman for a few years and have never seen one thanks again:)

Hussman manual has some detail/diagrams in section 4-21, page 55 of this pdf file...

http://www.hussmann.com/Discontinued%20Tech%20Info/Protocol_Discon_im.pdf (http://www.hussmann.com/Discontinued%20Tech%20Info/Protocol_Discon_im.pdf)

taylorauction
18-10-2011, 05:20 PM
We have an auction coming up Nov 5th in Lexington KY with 4 used Hussmann Protocol units and several late maodel cases, and another auction Nov 12 of a complete grocery store should anyone need some good used refrigeration equipment links are below, Thank you

Nov 5th Lexington, KY link
http://www.globalauctionguide.com/cgi-bin/guide.cgi?sec=v&type=cal&date=November+5,+2011&anum=1316991785

Nov 12th Nashville, TN link
http://www.globalauctionguide.com/cgi-bin/guide.cgi?sec=v&type=cal&date=November+12,+2011&anum=1316992424

or see our website www.taylorauction.net

or www.auctionzip.com our ID is 1680

kayakalp
18-11-2011, 08:28 AM
Your post is Excellent guy.