Watts Fleck 3900 Brass Valve - Manual (Page 4)

Printed in U.S.A.
Page 4
MODEL 3900
Water Conditioner Flow Diagrams
1
SERVICE POSITION
2
BACKWASH POSITION
3
BRINE POSITION
Hard water enters at valve inlet and flows down thru mineral to the bottom distributor. Conditioned water
flows up thru the distributor tube, around the piston and out the outlet.
Hard water enters at valve inlet  flows thru service adapter
piston for by-pass, and up thru coupling to regeneration valve
inlet. Flow continues thru the regeneration valve piston

down
the distributor tube

thru the bottom distributor and up thru the
mineral

around the piston and out the drain. If optional no
hard water by-pass piston is used, water flow to service outlet is
prevented by an extension on the service outlet until the end of
the rapid rinse cycle or brine tank refill cycle, depending on
options chosen. Hard water enters at valve inlet  flows thru injector nozzle and throat
to draw brine from the brine tank. Brine flows down thru the mineral

into the bottom distributor  up the distributor tube  around the
piston and out the drain.
DRAIN
INLET
REGENERATION
VALVE
SERVICE
VALVE
SERVICE
OUTLET
INLET
DRAIN
INLET
DRAIN
INLET
NO HARD WATER BY-PASS
SERVICE OUTLET