Kemper 361 Installation And Operating Instructions Manual

Installation and operating instructions
KEMPER Backflow Preventer BA Figure 361
1. Prerequisites for installation
Install the backflow preventer in
frost-free areas only!
Comply with standards:
Provide a drain line!
Application area
According to DIN EN 1717, in order to maintain flawless functioning of the BA backflow preventer, a flanged dirt trap
must be installed in the direction of flow before the BA backflow preventer. Type BA backflow preventers that accord
with DIN EN 12729 are used to secure drinking water plants against back pressures and siphon back flow. Fluids up to
and including Fluid Category 4 as per DIN EN 1717/1988-100 are secured. They can be used for residential buildings,
industrial and commercial purposes with consideration of their specifications. Normally (normal functioning with pressure
fluctuations), the vent hole of the middle pressure chamber only allows a few drops through. During malfunctions,
the vent hole can allow the full volume flow of the service pipe through. For that reason, dimension the wastewater
connection to be sufficiently large according to DIN EN 12056 and DIN 1986-100. Assume the volume flow that could arise
through the service pipe on the backflow preventer BA (pay attention to the nominal flow rate!). The backflow preventer
BA can secure the following hazard potential in accordance with the Fluid Category:
Category 4 (applies to backflow preventer BA)
Fluids that present a health hazard to humans due to the presence of one or more toxic or highly toxic substances or
one or more radioactive, mutagenic or carcinogenic substances.
The higher the classification, the greater the risk potential. For each category, DIN EN 1717 stipulates specific protection
valves. The Backflow Preventer BA, Figure 361 is approved without restriction for use up to and including Category 4. A
continual bacterial risk (Fluid Category 5) in extant piping systems must not exist.
2. Operating principle
The KEMPER BA Backflow Preventer is subdivided into 3 zones. In Zone 1, the pressure is higher than in Zone 2 and there
again higher than in Zone 3. A drain valve is connected to Zone 2, which opens latest when the pressure difference between
Zones 1 and 2 has decreased to less than 0.14 bar. The water from Zone 2 flows outdoors. That precludes the risk of back-
pressure or siphon back flow in the supply network. The pipeline is interrupted and the drinking water network is protected.
Intermittent dripping from the BA Backflow Preventer at the drain valve is not necessarily a malfunction.
Under such circumstances, the BA Backflow Preventer separates as intended!
DIN EN 1717, DIN 1988
DIN EN 12056, DIN 1986-100
Comply with the direction of flow!
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