Wifi pool timer switch12/10/2023 The link you provide for the new timer, per the wiring diagram shown will work as a replacement, although it does inaccurately describe it as SPST(single pole single throw). What is happening in your existing timeclock is this: when timer says 'turn on', internal switches close and connect terminal A to B, and terminal C to D. You did not indicate if your 2 loads were 120 or 240volt, assuming 240v with one being a heater, and current wiring but please advise if these loads are 120v as that may mean your current wiring is not correct(load neutrals should not be switched by clock). Those white wires are feeding the clock motor and confirms to me that A & C are the input power terminals. So from your pic I see that there are 2 white wires with factory crimps connected to our newly designated terminals A & C (the 2nd and 4th terminal from the left). Now, lets disregard the leftmost terminal(with no wires) and going from left to right with the remaining 4 terminals, lets call them A, B, C, D. ![]() This is a common time clock that internally has 2 separate NO(normally open) contacts(switches) that will both close when timer hits its mark (think 2 separate switches that close at the same time when timer says 'go'. pic 163833.jpg shows me 5 terminals on your existing mechanical timeclock. The following is written assuming no electrical knowledge so forgive if that's not the case. That being said, I have held a master electrician license since 1993 and have installed/replaced countless time clocks in my lifetime working commercial/industrial/residential and 100% can help you with this wiring issue. ![]() Grey, let me start by saying I am not one of the experts on this site and not in any way a master at anything related to upkeep of pool maintenance issues, and I've only reappeared here in the past month due to my own water maintenance issues in my own pool.
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