Xylem MM 217K Series 150S and 157S Low Water Cut-Offs/Pump Controllers - Manual (Page 10)

10
STEP 5 - Testing
OFF
ON
a. Turn on the electric power to the boiler. With the
boiler empty 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 applicable
codes and ordinances.
Note: Water levels stated below are only for 150 psi (10.5 kg/cm 2 ) operation.
This control is factory calibrated for specific applications. The following testing procedure is only meant to
serve as a verification of proper operating sequence.
Dimensions provided are typical for a boiler not being fired and/or not at pressure. Actual operating
ranges are shown on page 2 in the "Operation" section.
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
7 /
8
"
M
J
(22mm)
b. The boiler should begin to fill with water.
Watch the gauge glass (J) until the water
level reaches approximately d” (22mm)
above the horizontal cast line (M) on the low
water cut-off.
IMPORTANT: If water does not start filling the
boiler, immediately turn off the the boiler and
make the necessary corrections.
6. Re-attach the junction box cover (K).
K
Note:
Cover must be installed correctly as shown