Question 1

It is rated at 1/2 hp, 13 amps - will it work with a 3/4 hp moor with a nominal rating of 8.5a @ 110v?

Accepted Answer

Human,

Thanks for your question.
As you mentioned, we rate the Sludge Boss float switch at 1/2 HP 13 amps 120VAC.
A 3/4 hp pump will run nominally at 8.5 Amps @ 110VAC, but at startup or under load, the amperage draw of the pump will exceed the circuit rating of the float switch, which will cause premature failure of the float switch wiring and the Honeywell microswitch inside the float.

The easiest work around for your application is to use a contactor or relay.
Please contact us directly for more information on our Sump Alarm website, or @ customerservice@sumpalarm.com
We have a contactor we can recommend to install in parallel with this float switch to accommodate your 3/4 hp or larger pump in addition to a wiring schematic.

We’re here Mon-Fri, 8a - 5P
At: Sumpalarm.com
At: Level-Sense.com
Call us if you need immediate assistance: 314 787 8059

Thanks for Choosing Sump Alarm Products!

Kyle H
Applications Engineer, Sump Alarm
EI, BSME '17

Question 2

Will this float work in place of a septic products inc (spi) 20a702 pump down float switch?

Accepted Answer

According to the Spec sheet for the 20a702:

The float referenced from SPI is a control duty float that is made to be tethered. The Sludgeboss is internally counterweighted and does not require a tether. 
For the Operation to Pump Down, cap the blue wire coming from the sludgeboss. Let us know if this answers your question.

Question 3

I used this to replace my "high" float in a 3 float system (high, low, alarm).  the affluent level never reaches the low float.  replace both floats?

Accepted Answer

If it doesn’t reach the low float you may have other problems

Question 4

I have a Berkeley lift pump 5 horse 240 volt ,will this work for our application?

Accepted Answer

In that application, you need the Sludgeboss to control a relay or starter, and the relay or starter will control the pump. 240 volt applications have 2 hot legs, each 120V. Thats how they make the 240 Volts. Its really -120V and +120V, the difference between the two is 240 Volts. You need both those HOT legs to be opened and closed at the same time. Search amazon for B001KGSJ74. Also if it is an existing pump, your pump likely already has a contactor or starter on it.

Manufacturer	Sump Alarm
Part number	FBA_SA-2368-10-RAW
Item Weight	1.45 kg
Product Dimensions	17.78 x 11.43 x 11.43 cm; 1.45 Kilograms
Item model number	FBA_SA-2368-10-RAW
Style	33 Foot Cable
Material	Plastic
Power source type	Ac/Dc
Horsepower	0.5
Installation method	Floor-Mounted
Item Package Quantity	1
Cord length	16 Feet
Plug format	None -Wire Leads
Switch style	Float Switch
Specific uses	Sump Pump; lift station; pump control; septic tank; alarm
Batteries included?	No
Batteries Required?	No

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The"SludgeBoss" Heavy Duty Float Switch for Use With Sewage, Suspended Solids and Viscous Liquids

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