Thursday, May 23, 2024

Stop Water Cooler Damage with DIY Dry Running Protection System

efy tested

With this dry running protection system, you can prevent your water cooler’s motor from dry running and activate it for about one-third of the time only. This will reduce the wear and tear of the motor and save electricity too. Coolers are used in many homes, offices, schools, and industries, especially in summer.

So this device will come in handy to stop the cooler pump automatically when the cooler’s tank has no water.

DIY Dry Running Protection System for Pump
Fig. 1: DIY Dry Run Protection System for Pump

DIY Dry Running Protection System for Pump is shown in Fig. 1 and its circuit diagram is shown in Fig. 2.

Live DIY Video Tutorial In English:

Live DIY Video Tutorial In Tamil:

Components Required for Building Dry Running Protection System
Semiconductors:
IC1-LM7805, 5V voltage regulator
IC2-NE555 timer
IC3-4017 decade counter
BR1-1A bridge rectifier
LED1, LED2-5mm LED
D11N4007 rectifier diode
D2-D5-1N4148 signal diode
T1-2N2219 NPN transistor
Resistors (all 1/4-watt, ±5% carbon):
R1, R6-1-kilo-ohm
R2-470-kilo-ohm
R3-47-kilo-ohm
R4-10-kilo-ohm
R5-680-ohm
Capacitors:
C1-1000μF, 35V electrolytic
C2-100μF, 16V electrolytic
C3-10nF ceramic disk
Miscellaneous:
CON1-CON4-2-pin connector
S1-Water sensor probes made of steel (2)
RL1-5V, 1C/O relay
X1-230V AC primary to 9V, 500mA secondary transformer
-Cooler pump

DIY Dry Running Protection System – Circuit Diagram

The circuit comprises step-down transformer X1, bridge rectifier BR1, 5V voltage regulator LM7805 (IC1), decade counter 4017 (IC2), rectifier diode 1N4007 (D1), signal diode 1N4148 (D2-D5), NPN transistor 2N2219 (T1), 5V single changeover relay, and a few other components.



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