Tecmark Pressure Switch For Hot Tub 3902

Tecmark pilot duty adjustable hot tub heater pressure switch rated for 1 amp at 120 volts, 72VA pilot duty @ 24VAC.

Details:

• Brand: Tecmarck
• Model: 3902
• 1/8" threads (3/8" actual O.D)
• 1-5 PSI adjustable
• 2 terminals no common
• Maximum 1A @ 120 VAC, 72 VA Pilot Duty @ 24VAC

Also replaces: 3965, 36142, 3902, 3903, 34-0178, 6560-869.

Product note:
This hot tub pressure switch requires adjustment for the size and pressure of the specific hot tub it's being used in, easy to follow instructions included.

The Tecmark 3902 Pressure Switch in a hot tub or spa is a pressure sensor that is mounted onto the heater housing, or very close to the exit point of the heater. It's a safety switch with the sole purpose of sending a signal to the circuit board to shut off the heater if low pressure (low water flow) occurs to protect the heater from overheating and burning out.

In a hot tub, pressure is an easy way to determine flow rates through the pipes, pump and heater. Some spas also use a Flow Sensor, in addition to (or instead of) the Pressure Switch, to be sure water is flowing properly for the heater to operate safely.