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Your a Champion Gary,
Thank you for your reply.
Tradewinds III SM171
On 27/07/19 08:48, Gary Silver via
I used a timer nearly identical to this: https://www.amazon.com/ustyle-Digital-Programmable-Precision-Anti-Interference/dp/B07TC9Z45J/ref=sr_1_7?keywords=24+volt+fish+feeder+timer&qid=1564180095&s=gateway&sr=8-7
I believe mine is just a slightly older version. I wired it's
output to a second "ganged" 24 volt relay just to make sure I
didn't overload or shorten the life of the contacts of the relay
in this timer. The coil of the second relay is wired such that
when the timer calls for flushing (i.e. the timer closes its "NO"
(normally open) contact, it energizes the more robust relay coil.
The second relays contacts are wired into the fresh water
pressurization CB (circuit breaker) wiring. When I leave the
boat, I switch the timer from the "run" (i.e. always on) position
to the timer position then move the valve in the engine room to
the flush position. Thus when flush is called for the timer,
energizes the second "ganged" relay, turns on the fresh water pump
that runs for the programmed length of time (in my case 2 minutes
every other day). My system goes thru about 200 liters of H20 in
6 months on the hard using this schedule. Others may vary based
on the pump etc. I just put a bucket where the flush water comes
out on the port side of the boat, ran the program and measured the
through-put of the water. The only down side is that when on the
boat and the timer is set to the run position, the ganged really
is continuously energized (using a small amount of electricity)
and you have to leave the main battery switches on to provide 24
Vdc power to the timer/relay circuity. Mine has been running
perfectly for about 11-12 years now.
Gary S. Silver
s/v Liahona Amel SM 2000 #335
On the hard in Puerto Del Rey - Puerto Rico