Caution installation complete – Xylem MM 217K Series 150S and 157S Low Water Cut-Offs/Pump Controllers User Manual
Page 11

11
e.
To prevent serious personal injury from steam pipe blow down, connect a pipe to avoid exposure to
steam discharge.
Failure to follow this caution could cause personal injury.
!
CAUTION
INSTALLATION COMPLETE
7
/
8
"
M
J
(22mm)
c. For automatic reset models only. When the water
level reaches approximately d” (22mm) above the
horizontal cast line (lower for MD models) the burner
should come on (pump #2 should shut off with
Model 159S).
OR
For manual reset models only. When the water
level reaches approximately d” (22mm) above the
horizontal cast line press the reset button (N). The
burner should then come on.
d. Continue watching the gauge glass (J) to
see that the water continues to rise to
approximately 1a” (35mm) (1
7
/
16
” (37mm)
for MD models) above the horizontal cast
line (M). The pump should shut off (the
motorized valve should close with Models
158 and 158S, or with Models 159 and
159S, pump #1 should shut off).
N
Snap Switch Models
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 the last page of these instructions.
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