What is SA switch?

[vinhp]

Hello guys, I have a question about the SA switch. It connects with the solenoid valve (2-way valve) for fan coil units and act according to the operation of room thermostat. Do you have any idea about what is SA switch?

[The MG Pony]

it's a switch made in south Africa! No I'm kidding, it is usualy a proofing switch for the fan, sail air switch

basicaly it tells the system the fan is indeed opperating and more importently that A: the fan is opperating and B: the air is moving! No air movement the switch will not register

[install monkey]

surge absorber- like a flat grape that connects on l,n connections- usually get em all over denco kit

[install monkey]

or limit switch on the actuator to provide the chiller with a demand signal

[passandscore]

Sail Switch.jpg

Here is a random picture of a sail switch.

[hyperion]

In the wiring diagram shown it would appear that SA as shown is an activation or indicator signal to show when the motorised three port solenoid valve or two port solenoid valves have fully opened. At a guess, these are probably motorised valves as opposed to true solenoid valves. The drawing appears to depict a water filled heating/cooling system.

[vinhp]

so, SA switch = sail switch?

[passandscore]

SA = Snap Action. Air pressure switches are just one type of snap action switch.

[stufus]

Personally I'd go for sensor ambient (room sensor) after all thats what will dictate the operation of the valve.
Cheers
Stu

[hyperion]

Why not "Solenoid activated" as the coils of ZJ1 etc are in parallel with the solenoid valves, thereby giving an feedback that the solenoid has been activated.

[chemi-cool]

It is not a switch,
More likely some indicator or currant protection.

[install monkey]

where did you get the drawing from?? what manufacturer specified this, model numbers, we may be able to give a correct answer

Hello guys, I have a question about the SA switch. It connects with the solenoid valve (2-way valve) for fan coil units and act according to the operation of room thermostat. Do you have any idea about what is SA switch?