Installer Manual Fleck 3900 - NXT - Installation
Ref. MKT-IM-015 / B - 08.06.2018 55 / 126
5.11. Drain line connection
Note
Standard commercial practices are expressed here. Local codes may require changes to
the following suggestions. Check with local authorities before installing a system.
Mandatory
The drain line must be built with 1" PVC rigid tube with an air gap must be present at the
drain.
Caution
Flexible and semi-flexible hoses may bend and whip during draining.
The drain line must be built with 2" PVC rigid tube with an air gap.
The drain line may be elevated up to 1.8 m providing the run does not exceed 4.6 m and water pressure
at the softener is not less than 2.76 bars. Elevation can increase by 61 cm) for each additional 0.69 bar
of water pressure at the drain connector.
Where the drain empties into an overhead sewer line, a sink-type trap must be used.
Secure the end of the drain line to prevent it from moving.
Note
Waste connections or the drain outlet shall be designed and constructed to provide
connection to the sanitary waste system through an air-gap of 2 pipe diameters or 50.8 mm
(2"), whichever is larger.
Caution
Never insert the drain line directly into a drain, sewer line or trap. Always allow an air gap
between the drain line and the waste water to prevent the possibility of sewage being back-
siphoned into the softener.
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