Lattner Boiler Company WLF 9.5 HP Instruction Manual page 40

INSTALLATION
TOOLS NEEDED:
Two (2) pipe wrenches, one (1) flathead screw
driver, and pipe sealing compound.
STEP 1 - Determine the Elevation at Which the
Low Water Cut-Off/Pump Controller Must be Installed
If the control will be the primary low
water fuel cut-off, size the steam (top)
and water (bottom) equalizing pipe lengths
so that the horizontal cast line on the body
is 1a" (35mm) below the boiler's normal
water level, but not lower than the lowest,
safe permissible water level, as deter-
mined by the boiler manufacturer.
OR
If the control will be the secondary low
water fuel cut-off, size the steam (top) and
water (bottom) equalizing pipe lengths so
that the horizontal cast line on the body is
at or above, the lowest, safe permissible
water level, as determined by the boiler
manufacturer.
STEP 2 - Installing the Low Water Cut-Off
a. Using a pipe wrench, unscrew the plastic
float blocking plug (A) from the low water
cut-off body (B).
Series 150S
(except Model 150S-B)
B
A
IMPORTANT: Follow the boiler manufacturer's
instructions along with all applicable codes and
ordinances for piping, blow down valve and water
gauge glass requirements.
1 3 / "
8
(35mm)
LOWEST PERMISSIBLE
WATER LEVEL
WATER
EQUALIZING
PIPE
BURNER OFF
LOWEST PERMISSIBLE
WATER LEVEL
WATER
EQUALIZING
PIPE
Models 150S-B
A
B
STEAM EQUALIZING PIPE
AS A PRIMARY
LOW WATER CUT-OFF/PUMP CONTROLLER
NORMAL BOILER WATER LINE
BURNER "CUT-OFF LEVEL" AT CAST LINE
VERTICAL EQUALIZING PIPE
BLOW DOWN VALVE
STEAM EQUALIZING PIPE
AS A SECONDARY
LOW WATER CUT-OFF/PUMP CONTROLLER
BURNER "CUT-OFF LEVEL" AT CAST LINE
VERTICAL EQUALIZING PIPE
BLOW DOWN VALVE
Series 157S
A
B
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