Xylem MM 226C Series 69 Low Water Cut-Offs For Steam Boilers - Manual (Page 7)

TESTING
• Manually fill boiler until water level in the sight
glass is above the control.
• Turn on the power to the boiler and water feeder.
Activate the burner by raising the thermostat set
point.
• Using the sight glass as a reference, slowly
drain water from boiler by opening the blow
down valve or the boiler drain until the low water
cut-off activates the water feeder.
IMPORTANT: If the water feeder does not
activate before the water level reaches the
bottom of the sight glass, immediately close
any open drain or blow down valve and check
controls and piping for proper installation.
Correct any problems.
• Continue to drain the boiler slowly. If the burner
does not turn off before the water level reaches the
bottom of the sight glass, immediately close any
open drain or blow down valve. Check control for
proper installation. Correct any problems.
• Once the burner turns off on low water, close all
boiler drains or blow down valves.
• Using the sight glass as a reference, see that
the water feeder activates and fills to approxi-
mately 1/2” to 1” (13 - 25mm) above the
burner cut-off level of the low water cut-off.
IMPORTANT: If the water feeder does not
turn off once the water level has surpassed
the halfway point of the sight glass, immedi-
ately turn off the power to the boiler and water
feeder and check control for proper installation.
Correct any problems.
• Repeat test 2 or 3 times. Restore boiler and
controls to normal settings.
INSTALLATION COMPLETE
LWCO
Level
Cover Switch
Housing
Replace the cover on the switch housing and,
using a flathead screwdriver, tighten the one (1)
screw to approximately 2 ft•lb (2.6 N•m).
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