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Hot Water Production Delay Timer

Hot Water Production Delay Timer
Hot Water Production Delay Timer
This circuit interferes with the low-voltage connection between the boiler control unit and the hot water flow switch — the sensor that closes a switch when the opening of a hot water tap is detected. The goal is to turn on the boiler with a user-adjustable delay and to avoid the unnecessary waste of gas.
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Materials

Component list

Component List

Resistors

R1 = 220 k

R2 = 470 k

R3 = 12 k

R4 = 2k2

R5 = 27 k

R6,R7 = 1 k

 

Capacitors

C1,C2 = 47 µ/25 V radial

C3 = 100 n

 

Semiconductors

LED1 = LED 5 mm red

LED2 = LED 5 mm green

D1 = 1N4148

Q1 = BC327

Q2 = BC337

U1 = PIC12F683

U2 = 78L05

 

Miscellaneous

RL = 5 V relay OMRON G6H-2-100 or equivalent

But1, But2 = push button 6 mm

J1..J3 = 6-way terminal block pitch 3.5 mm

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