Xylem MM 219J Replacement Head Mechanism - Manual (Page 10)

K
To prevent serious personal injury from steam pipe blow
down, connect a drain pipe to the control opening to
avoid exposure to steam discharge.
Failure to follow this caution could cause personal injury.
! CAUTION
INSTALLATION COMPLETE
10
Snap Switch Models
STEP 4 - Testing
OFF
ON
a. Turn on the electric power to the boiler.The pump should go on
and the burner must remain off.
IMPORTANT: Follow the boiler manufacturer’s start-up and operating instructions along with all applica-
ble codes and ordinances.
This control is factory calibrated for specific level
settings as shown on pages 2-4 in the “Operation”
section. The following testing procedure is only meant to
serve as a verification of proper operating
sequence.
If the burner comes on, immediately turn the boiler off and make the
necessary corrections.
Failure to follow this warning could cause an explosion or fire and
result in property damage, personal injury or death.
! WARNING
b. The boiler should begin to fill with water.
As the water level rises in the sight glass,
the burner should turn on and then the
pump should turn off at appropriate levels.
For manual reset models, press the reset
button (K) when the water reaches appro-
priate level.
If the burner does not turn on or pump
turn off at appropriate levels, immediately
turn off the boiler and make necessary
corrections. Location of Manual Reset Button
c. Blow down the control when the water in the boiler is at
its normal level and the burner is on. Follow Blow Down
Procedure found in Maintenance Section on page 11 of
these instructions.