Ballast Q's

[Dave K]

Q#1 When a manifold is made to run 2 Johnson reversible pumps, if the intake is off set closer to one outlet more than the other, is it going to make a big differences?





Q#2 I was planning to take power to the ballast switches with a 8ga power wire, then a 12ga direct to pumps. Will this work? Do I have to use relays?? With the reversible pumps I have no idea how or if it can be done?

Heres some info from the pump manual

Wiring dimensions
(based on 3% voltage drop)
Wire size Max wire
lenght* in m
_________________12V___ 24V
2,5 mm² # 14 AWG 2,7.....11
4 mm² # 12 AWG...4,4.....17,6
6 mm² # 10 AWG...6,6.....26,3
10 mm² # 6 AWG....11
16 mm² # 4 AWG....17,6
25 mm² # 2 AWG....27,4
*The wire length is the total distance from
the battery to the pump and back to the
battery. It is recommended to use a relay to
shorten the main leaders.


Q#3 I think I know the answer but on the Johnson reversable pumps there is a grower, black wire and a red. Could a single pole on-off-on switch work or does it have to be a double pole??


Q#4 When using a 2 pump Tsunami system do the bags passivily fill even thought the switch is off?


Thanks,

[chpthril]

Q1 - off-set intake OK

Q2 - Fused 8ga to the switches and then 12ga to the pumps OK

Q3 - You need a 6 terminal DPDT switch to reverse the motor. 7 terminals if you want lights in the switch. I think you only need to use the red and black for the motor. The third, maybe a green, is for grounding the pump body when using to transfer fuel.

Q4 - yes, aerator pumps can passive fill or drain. Hose routing, anti-siphon valves and check-valves are sometimes needed to prevent this. Ive even known the impeller pumps to passive fill/drain when used with a scoop (forward or backwards).

[duffymahoney]

I have designed and installed 3 aerator systems and I don't use anti-siphons. I use check valves on everything and that seems to work perfectly. The folks at wakemakers say they are needed but I never found that to be true.

[jason@wakemakers.com]

It depends on the location of the bag in the boat, and it's relative height compared to the fill pumps. Check valves will usually work in every scenario.

[rushin]

jason- i sent you a e-mail reply.

[Dave K]

Is the norm to use plastic or chrome thru hulls for discharge and vents? Any reason why?

Thanks

[Dave K]

Hey guys,

The Tsunami 800 pumps... do they have the same thread as the 3/4" elbows, couplers, etc that you would typically find at Home Depot?

Thanks

[chpthril]

Is the norm to use plastic or chrome thru hulls for discharge and vents? Any reason why?

Thanks

I use Chrome, SS and glass reinforces w/SS face. No issues with any.

Hey guys,

The Tsunami 800 pumps... do they have the same thread as the 3/4" elbows, couplers, etc that you would typically find at Home Depot?

Thanks

no

[Dave K]

no

So these pumps will not screw into a shut off value that is inturned screwed in the the thu-hull?

[chpthril]

So these pumps will not screw into a shut off value that is inturned screwed in the the thu-hull?

Not necessary, just need to match the threads.

[Dave K]

With the Tsunami or rule pumps the draw is only 3 or 4 amps.

Is it really necessary to use relays? Seems like extra work thats not needed?

[chpthril]

With the Tsunami or rule pumps the draw is only 3 or 4 amps.

Is it really necessary to use relays? Seems like extra work thats not needed?

No. A typical Carling rocker switch is rated for 20A. Thats more then enough to handle a couple pumps.

[Dave K]

when putting the components together is it better to use alittle 3M4000 on the threads or teflon tape or pipe dope?

[chpthril]

when putting the components together is it better to use alittle 3M4000 on the threads or teflon tape or pipe dope?

For below the water line, I like to use marine sealer/adhesive.

[Dave K]

For all the pumps in the rear of the boat ground wires can just be daisy chained? 14ga?