[DeTomaso] AC trinary switch - explained

[Larry Finch]

All,

I have been aware of AC pressure safety switches in two styles, the original binary style and the more current trinary style.
 
I recently had reason to dig a little deeper and learned some things that certainly added to my knowledge and I think are worthy to share.

The Pantera OEM system had neither of those safety switches. Most driers provide a threaded port that can be used for either switch.

In a nutshell, a binary switch provides high and low pressure cut off of the compressor 12v when pressure falls above or below the switch triggerpoints -406psi and  30psi. 

The trinary switch retains those functions, but adds a set of contacts that close upon detection of 254 psi in the system, providing 12V to the condenser fan. 

Informative video by vintage air on 
YouTube -  

https://youtu.be/l604JCZx_ow



Larry
 






Sent from me using a magic, handheld electronic gizmo. 
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   All,

   I have been aware of AC pressure safety switches in two styles, the
   original binary style and the more current trinary style.



   I recently had reason to dig a little deeper and learned some things
   that certainly added to my knowledge and I think are worthy to share.

   The Pantera OEM system had neither of those safety switches. Most
   driers provide a threaded port that can be used for either switch.

   In a nutshell, a binary switch provides high and low pressure cut off
   of the compressor 12v when pressure falls above or below the switch
   triggerpoints -406psi and  30psi.

   The trinary switch retains those functions, but adds a set of contacts
   that close upon detection of 254 psi in the system, providing 12V to
   the condenser fan.

   Informative video by vintage air on

   YouTube -

   [1]https://youtu.be/l604JCZx_ow

   [cid:60F13B38-E91A-4FAF-B7BC-07FDBE0EE9F5-L0-001]

   Larry



   Sent from me using a magic, handheld electronic gizmo.

References

   1. https://youtu.be/l604JCZx_ow
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