A project log for Watts Intelliflow timer

Timer based dummy load for washing machine valve

Nick SayerNick Sayer 10/24/2020 at 01:290 Comments

Well, stress testing of the V3 design showed some flaws. The 9.1kΩ resistors just get too hot and damage the board. So that's no good. I'm going to try 10kΩ because I have them handy, but there's probably a balancing act that's going to be necessary between getting too hot and pulling enough current through the Intelliflow to trick it into staying on. The previous board had just under 3 watts on the DC side and it wasn't perfectly reliable. Going from 9.1 to 10 kΩ drops the power on the AC side from 4.75 watts to 4.33 watts. The next most logical step would be to try 11kΩ, which would be just under 4 watts.