Xylem MM 226C Series 69 Low Water Cut-Offs For Steam Boilers - Manual (Page 3)

OFF
ON
• Turn the boiler off.
• Drain the water in the boiler to a level which is below the
tapping on the boiler. Allow the boiler to cool to 80˚F (27˚C)
and allow the pressure to release to 0 psi (0 bar).
• Determine where to install the control. The low water cut-off
must be positioned at or above the boiler manufacturer’s
minimum safe water level.
• Separate the mounting barrel from the control slightly by
loosening the eight (8) slotted screws on the clamping ring.
This allows the barrel to be turned into the tapping in the
boiler without rotating the whole control. (The barrel may
also be completely removed to install easily).
• Apply a small amount of pipe dope or thread sealant to the
2 1/2 NPT and hand screw the barrel into the boiler without
rotating the rest of the control. Tighten the barrel securely
using a pipe wrench to about 150 ft-lbs. (200 N•m) torque.
• Rotate the control in the barrel to the finished position using
a level to set the two (2) conduit housing screws (AA) in a
horizontal position. Complete the installation by securing the
control onto the barrel by tightening the eight (8) clamping
ring screws to 5 ft-lbs (7 N•m) torque. "TOP" on the switch
terminal panel MUST be in the up position.
INSTALLATION –
TOOLS NEEDED:
One (1) flathead screwdriver, one (1) level indicator
and one (1) pipe wrench.
3
Installation of the Low Water Cut-Off
minimum safe
water level
AA
Clamping ring
and 8 screws
Cut-off
level
The center line on the casting of the Series 69 must be installed above the lowest permissible water level
determined by the boiler manufacturer.
Whether the gauge glass is mounted directly into the boiler or on an independent water column, the cut-off line on
the 69 control should be mounted 1/2” (15mm) above the lowest visible point of the gauge glass.
IMPORTANT: Follow the boiler manufacturer's
instructions along with all applicable codes and
ordinances for piping, blow down valve and water
gauge glass requirements.
NOTE: To connect wires to the terminals on
the water feeder, burner, or low water cut-off,
place the bare end of the wire under the termi-
nal screw and tighten the screw with a flathead
screwdriver.
Cover
Using a flathead screwdriver, remove the one (1)
screw that secures the switch cover.