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vinhp
02-08-2013, 10:12 AM
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
02-08-2013, 02:21 PM
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
02-08-2013, 06:33 PM
surge absorber- like a flat grape that connects on l,n connections- usually get em all over denco kit
install monkey
02-08-2013, 10:04 PM
or limit switch on the actuator to provide the chiller with a demand signal
passandscore
03-08-2013, 04:09 AM
10608

Here is a random picture of a sail switch.
hyperion
03-08-2013, 04:27 PM
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
09-08-2013, 02:14 AM
so, SA switch = sail switch?
passandscore
09-08-2013, 02:23 AM
SA = Snap Action. Air pressure switches are just one type of snap action switch.
stufus
09-08-2013, 07:47 PM
Personally I'd go for sensor ambient (room sensor) after all thats what will dictate the operation of the valve.
Cheers
Stu
hyperion
09-08-2013, 09:12 PM
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
10-08-2013, 09:20 AM
It is not a switch,
More likely some indicator or currant protection.
install monkey
10-08-2013, 03:58 PM
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?