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Heater Pressure Switches

3-47-369-1100 PresAirTrol Tinytrol Mini Pressure Switch, SPDT, 1/8in Hose, 2 PSI


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Item #: 3-47-369-1100
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Pres-Air-Trol 21 amp pressure switch TNP111E-2PR is a miniature pressure switch, set at 2 psi and rising. with a 1/8” slip barb hose CENTER water connection, and three wire terminals for common, NC and NO wires. Threads shown in picture are used to mount the pressure switch to chassis or panel, using lock nut, not shown. Hose is pushed onto spigot inside the threaded mounting nipple. Non-Adjustable pressure switch is Normally Open and comes factory set at 2 psi. Made in the USA by PresAir.

Pressure switches are used on spa, tub and bath heaters to measure the amount of water pressure inside of the heater, as an approximation of water flow. Pressure switches are safety devices intended to prevent heater damage and overheated water hazards. If your pressure switch is causing the heater to shut down, look for causes of low flow in and out of the heater, and remove the spa filter temporarily to improve flow. Pressure switches do fail eventually (which is why sell replacements), but first assume a flow problem, and not a switch problem.



PresAirTrol Tinytrol Mini Pressure Switch, SPDT, 1/8in Hose, 2 PSI
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