Craig,
sometimes wonder if I should chime in as I don't want to appear as a know-it-all or a constant loud-mouth. So here goes just to push it along summore. These are taken from my notes as I do not have my bilge pump system installed. I apologize for any repititions!
Electrics: Good connections. Use Ancor adhesive lined heat shrink crimp connectors. Have another piece of shrink wrap on the wire and after the above has cooled shrink that one over it all.
Best wire. Use ONLY insulated duplex tinned multi-strand wire that is sized for voltage drop based on how long the run is (remember, it's TWICE as long) and the pump amp draw.
Set the system up for auto with manual overide. Wire bilge pumps directly to battery so that when you hit the battery selector switch when leaving the boat no matter what it says on the switch the boat is still protected.
Include a hidden total kill switch so pumps won't cycle when the boat is out of the water.
Constant cycling can be a battery drain fiasco. Bats have to be hooked up to a charger and/or solar panel. This is addressed on the whole system agenda. Trickle-charger?
Don't over-stress the pumps. Use recommended size hose. Keep the head as short as is safe. Reduce length of hose to the loop. Off the shelf loop vents can clog and cause siphoning. Check valves restrict pumping capacity and are frowned on by nearly everybody including insurors.
Make sure exit is as high above the waterline as possible and is protected with a seacock.
Use Trident 147/148 smooth ID wall hose, NOT corrugated hose from the marine store.
Use 100% 316 hose clamps. Make sure all parts of the clamp is s.s. The best clamps have a smooth/solid band that is not sliced. Sandvic?
Source all leaks coming into the boat.
Put the smaller pump in the low position. It will take care of incidental water and is cheaper to replace. Mount it high enough so it won't continuously cycle because of hose water run back. Put the high capacity pump switch higher in the keel-sump so that it is used only in emergencys. Helps save an expensive pump.
Use UNCOVERED Rule super switches so that you can lift them out of the sump to SEE if they are working.
Use the manual pump to lower the water level in the sump. Save the electric.
There are threads here that discuss A/C leak sources.
Planning to take the boat offshore creates a way more intense level of leak protection. Some things requiring upgrading have been talked about on the forum. Make sure that what you might have to depend on is actually working. Checklist.
Investigate mounting the pumps to King-starboard or other plastic to make it easily removable so sump can be cleaned if necessary and pumps replaced or cleaned. Float and super switches same thing. To keep them in place in a crowded keel-sump. 338's sump may have to have non-submersible pumps.
Flex-impeller (non-submersible pumps) will burn up if run dry, have good head but way less capacity. Research how long a 'submersible' can be run out of water, ie, with a short hose into the bilge???
Attwood pumps DO NOT USE TINNED WIRE in their connecting wires.
Check out Snake River Electronics' "Bilge Buddy Pump Control" that senses water level in bilge without floats and can be set so rapid pump cycling can't occur.
Carry whole pumps as spares.
Submersible pumps are 'throwaways'. Most have a one year warranty. Seasonal maintenance could include replacing the bilge pump with a new one.
No manual pump can keep up with a 1" hole located two feet below the waterline. Nor can you depend on the largest electric Rule to keep up with a gusher like that! Have access to all parts of the hull. Carry a sailcloth hole-diaper as well.
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