Xylem MM 206F Series 63 Low Water Cut-Off - Manual (Page 2)

Gauge Glass Mounted
Directly into Boiler
CUT-OFF
LEVEL
1" BLOW DOWN
VALVE
For Boilers with
Independent Water Columns
1" STEAM
EQUALIZING PIPE
MODEL 63
LOW WATER
CUT-OFF
1" WATER
EQUALIZING PIPE
1" WATER
EQUALIZING PIPE
1" WATER
EQUALIZING PIPE
CUT-OFF
LEVEL
MODEL 63
LOW WATER
CUT-OFF
2
a. Whether the gauge glass is mounted directly into the boiler or on an independent water column, the
cut-off line on the 63 body casting should be mounted 1/2” (15mm) above the lowest visible point of the
gauge glass.
a. Locate the gauge glass and
determine the level that the 63
has to be mounted at in order
to achieve the criteria in Step 1.
b. Pipe the 63 following the
diagrams shown to the right.
Follow the diagram that
represents your boiler.
c. Crosses should be used at
each right angle connection for
inspection and cleaning.
d. Make sure the blow-down
valves are full port.
e. While the burner is operating,
open the blow-down valve,
causing the water level to drop in
the float chamber while burner is
operating. As the float drops the
alarm circuit (if used) closes first;
then on further drop the cut-off
circuit will open, shutting the
burner off.
f. Test the Model 63 before leaving
the site.
STEP 2 - Installation of the Model 63
Model 63 – For Steam Boilers with 1” (25mm) Equalizing Lines
INSTALLATION –
TOOLS NEEDED:
One (1) flathead screwdriver and two (2) pipe wrenches.
STEP 1 - Determine the Location of the Low Water Cut-Off
For 63 models with float block
CUT OFF
LEVEL
A
Using pipe wrench
• Remove float blocking plug (A) from low
water cut-off body tapping.
• Screw 3/4” NPT steel plug (provided) in
tapping.