Xylem MM 201H Series 67 and 767 Low Water Cut-Offs For Steam Boilers - Manual (Page 3)

3
a. Turn the boiler off.
b. Drain the water in the boiler to a level which
is below the lower gauge glass tapping (B)
of the control body (A). Allow the boiler to
cool to 80˚F (27˚C) and allow the pressure
to release to 0 psi (0 bar).
STEP 2 - Preparation
OFF
ON
A A
B
a. Using a pipe wrench, remove the float blocking
tube (F) from the new control and tighten a 2"
(13mm) NPT pipe plug (G) (provided) into the
tapping on the bottom of the control body (A).
Tighten the pipe plug to 31 ft•lb (42 N•m).
A
F
G
When using the tape sealant on the external threads of pipes or fittings, follow the manufacturers instructions. Use
sparingly and do not place on the first thread.
! CAUTION
STEP 3 - Installing the New Low Water Cut-Off
b. Using a pipe wrench, install a 2" (13mm)
nipple (H) into the lower gauge glass tapping
(B) and pipe tee assembly (J). Tighten both
connections to 31 ft•lb (42 N•m).
J
B
H