Ok, I bit the bullet and bought a refurbished 3400VSP for $500 with a 6 month warranty. Couldn't swing the $1500 cost of a new one up here (Canada), and a new one would only come with an extra 6 months of warranty anyways, most of which would be consumed during next winter when the pump isn't running anyways, so I figured I've nothing to loose.
A few technical questions:
- It's is far more HP than I need really so rarely (or never) do I want it to run at 100%, but I'm a little concerned about the automatic prime feature that seems to happen every time the pump starts after being shut down. If I program the "never exceed x RPM" option to something that results in the pump running around 50% without exceeding it...will the prime feature respect that setting, or does it ramp up to 100%/full RPM anyways?
- Does the pump detect a successful prime, or does it just run for whatever it's "prime minutes" program setting shows and then ramp to the actual commanded (typically lower) RPM afterwards?
- Can the auto prime feature be disabled completely? I have a check valve just before my pump connections and never loose prime under normal operating conditions - even if I completely empty the skimmer basket water is never more than 6" from the pump after restart because of the check valve.
- I have a Hayward Goldline GL235 solar automation controller. My ideal program is that the pump doesn't run much through the day (very high peak $$$ electricity rates here, even higher than CA) unless the solar controller calls for it. I know the solar controller has a relay (I used it with my SuperPump before for simple on/off control) but I'd like to let the VS simply alter program when the solar controller calls for demand. As I understand it, with only a single relay available in the solar controller...if I close the low voltage contacts on the "input 1" terminals on the 3400 this will command the pump to proceed to "Timer Speed 1"? I can then setup "Timer Speed 1" to whatever RPM my testing shows is peak for my solar..and away it will go? When the relay on the solar controller opens (weather gets cloudy or the commanded pool temp is reached) the pump will simpy return to it's last status, either be it "off", or a timer program it was running previously that may be at a different (likely lower) RPM?