The success of the Excel design meant that a three chamber unit could be specifically designed for those with NO continuous 110 volt supply. First launched in 1981, the Excel NE has long been the standard toilet for those living off the grid. A 1998 redesign gave the unit a rounded look, and recessed the drum handle.
The Excel NE has no fan or heater. Odorless operation is achieved by a 4″ vent mounted at the top rear of the unit which acts like a chimney on a wood stove. For good air movement the vent should be installed vertically and to 2-3 feet above the peak of the roof.
The optional 12 Volt Fan should be installed if you need to install the toilet with any bends in the vent. No more than 2 45° bends are encouraged, even with the fan.
If the Excel NE is used residentially or heavily, or is in a place which is subject to downdraft, the optional 12 volt fan should be installed in the vent stack. This fan draws 1.4 watts and can be powered by a solar panel and 12 volt marine battery.
Evaporating capacity on the Excel NE is variable, so the 1″ drain at the rear should be connected to an approved drain pit, container, or other facility.
The electric EXCEL, COMPACT, CENTREX 2000 A/F and Centrex 3000 A/F will evaporate all liquids, depending on use and climate (ie use over-capacity and extremely humid weather). However, other than the CENTREX 2000 A/F and 3000 A/F, where it is optional, all Central units, the Excel-NE, the Sun-Mar Mobile, and the SPACESAVER should have the overflow security drain connected.
Even though we expect the Excel, Compact, and Centrex 2000/3000 AF to evaporate all liquids in most situations, we always recommend that the overflow drain be connected if the units are being used residentially, or the units will be seeing heavy use for a short period of time (ie party, large family visits). This drain should always be connected as a security measure.
A 10 Foot 1″ drain hose and stainless steel hose clamp is supplied with all Central units, non-electric units, the SpaceSaver, and all Sun-Mar Mobile units. Collect and/or treat excess liquid in an approved facility such as a recycling bed, old septic system, holding tank or drain pit.
To make a recycling bed to evaporate and transpirate the liquid without touching the environment, simply dig a bed 18″ deep, and line it with plastic sheet. Bed size – normally 3-25 square feet – varies with geographic area and season. Fill it with 6″ of gravel then 12″ of sand and plant with grass and shrubs.
Facilities for excess liquid should be installed in accordance with local regulations. In many areas, this is about 1 ft. deep and 2 ft. in diameter. Place sturdy cover (plastic, tin or wood) and a 6″ mound of earth over the drain to prevent soil and surface water from settling into the gravel. See the diagram at right.
Listed capacities refer to the amount of people, on average, using the unit per day. Do not pick a unit that is below your capacity.
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