Choosing trinary switch pressures
Posted: Fri Feb 20, 2026 3:18 pm
Choosing trinary switch pressures
Since trinary switches are available in different trigger pressures - Some have a high pressure cut our at 490psi, some have the high cut out at 420psi. similar variance for fan trigger PSIs
So - What determines what trigger pressures to use? For both the low/high pressures and the fan pressures.
The question is general and comes from designing a custom 134a system.
Thanks in advance.
Since trinary switches are available in different trigger pressures - Some have a high pressure cut our at 490psi, some have the high cut out at 420psi. similar variance for fan trigger PSIs
So - What determines what trigger pressures to use? For both the low/high pressures and the fan pressures.
The question is general and comes from designing a custom 134a system.
Thanks in advance.