7
Installation of low air alarm (see assembly drawing)
The low air alarm is built into the standard NuWater ATU combo timed dosing panel. The small
diameter flex air tubing attaches to the barbed brass tank tap on the side of the blower, and adapts up to
½ PVC with the provided fittings (see assembly diagram). The ½” PVC runs underground to the
location of the ATU combo panel, then elbows up and transitions to UV rated (gray conduit) ½” PVC,
which runs up to the base of the control panel. The provided fittings adapt back to the small diameter
flex tubing at the base of the control panel. Apply a ring of silicone sealant at the perforation. The
fittings will effectively pinch the bottom wall of the control panel, forming a water-tight seal, as shown
on the assembly diagram. The flex tubing should do a ¾ loop inside the panel to allow slack for future
removal and repositioning, and tie in at the barbed air switch.
Wiring
Separate circuit is required for the controls. Timer controller at panel controls effluent pump on/off.
See wiring diagram. Outdoor plug receptacle independent of controls required in blower housing,
resulting in constant power to blower (blower has internal controller for skim cycle). All electrical
wiring shall conform to the requirements of the NEC (National Electric Code) and all other standards
under the jurisdiction of the state. All external wiring must be installed in approved conduit.
Pre-Trash tank Recommendation:
The manufacturer recommends addition of a pre-trash tank on
systems 3 bedrooms and larger without projectable flows, and also where a projected average waste flow
exceeds 70% of the treatment capacity of the treatment system.
The NuWater BNR-Series ATUs have a built-on trash tank which work well for typical residential
applications. However, when peaks in waste flow and strength are anticipated (families with 5 people or
more, etc.), additional tank capacity is recommended in the form of a “Pre-Trash” tank. This tank
should be one-compartment, and should be between 500 and 1000 gallons. Inlet and outlet baffle tees
are advisable.
Pre-Trash Options:
A simple single compartment tank can be used as a trash tank. Access must be
available at the inlet as well as the outlet. A more desirable option may be to use the dose-trash combo
optional tank configuration widely used in several counties. This utilizes a 2-compartment, 1500 gallon
tank, with the 500 gallon compartment used as the pre-trash tank. The waste then exits the side of the
tank and enters the treatment unit. Upon leaving the treatment unit, the waste re-enters the 1000 gallon
compartment of the 1500 tank, used as a pump chamber. Drawings are available on request.
Salcor UV light for Treatment level “A” systems
For systems meeting treatment level “A”, UV disinfection is required. The Salcor 3G UV light is
commercially available at most pipe supply houses. Refer to installation instructions provided by
Salcor. It is imperative that care be taken not to break the fragile UV bulb. The UV assembly shall be
installed in the inlet of the pump chamber. Use a reducing fernco to suspend the UV assembly from the
6” inlet access, and install the ballast and controls just below final grade in a Electrical-style access box
(similar to a valve can but larger). Individual circumstances may prevent installation inside the pump
chamber, in which case the UV assembly can be direct-buried along the line between the treatment unit
and the pump chamber. The base must bear on native soil or on compacted granular fill.
Start up
Once all the proper connections have been completed and the tank is filled with water, the aerator is
turned on. Cycle the airlift (see instructions on Pg. 7, maintenance duties, #9), observe proper operation,
then make sure to switch it back to “auto”. The system is now in operation. For the treatment plant to
become biologically stable, it will take four to sixteen weeks from first use to establish a population
growth of microbes. It is microbes from the waste stream which make the system operate properly.
Summary of Contents for BNR 500 GPD
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