Xylem MM 317C Models 21 & 221 Mechanical Water Feeders - Manual (Page 3)

3
INSTALLATION
TOOLS NEEDED:
One (1) adjustable wrench, socket wrenches, two (2)
pipe wrenches, pipe dope, assorted fittings and lengths
of 3/4” pipe.
STEP 1 - Preparation
This Water Feeder mounts directly on the
tank or vessel. The tank or vessel is to be
manufactured with a mating flange (A)
and opening large enough for the float.
The flange can be either welded flush on
the side or head and have pre-tapped
mounting holes (preferred), or a necked
or nozzle flange with plain mounting
holes. Either must have a 1-3/8” maximum
distance from the outer flange face to the
interior wall surface to allow the float to
fully drop to get maximum valve capacity.
City Water Supply
Check Valve
Bypass
Condensate Receiver Tank
Pump
Discharge
Feed Pump
MODEL 21
The feeder is usually mounted one-third
(1/3) of the way up from the bottom of the
tank. This provides two-thirds (2/3) of the
tank for return condensate.
Follow the diagram for piping the feeder
to the tank and water supply. Remember
to leave room for the servicing the water
feeder. At all right angle turns in the
equalizing piping, crosses should be used
to facilitate inspection and cleaning.
STEP 2 - Install the Piping
NO. 21
NO. 221
Flange Dimension Details
Tank w/
Flange
1-3/8”
MAX.
Bulk
Head
Flange
1-3/8”
MAX.