Xylem MM 214E Series 61 Low Water Cut-Off - Manual (Page 3)

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a. The line on the casting of the model 61 must be installed above the lowest permissible water level
determined by the boiler manufacturer.
a. Study the figures to the right and determine which
figure shows how the 61 control will be attached to
the boiler.
Figure 1. Connect the upper equalizing pipe to
the riser going to the radiation or to the compression
tank. Connect the lower equalizing pipe to any
available opening in the side of the boiler. NOTE: If
no opening is available in the side of the boiler,
connect the lower equalizing pipe into the drain
connection.
Figure 2. If there is a tapping available on the
top of the boiler connect the upper equalizing pipe to
it. NOTE: During initial filling or after blow down the
upper equalizing pipe and possibly the 61 control will
have an air pocket. Connect a vent or bleed valve on
the top of the vertical equalizing pipe. If the Test-N-
Check (TC-4) valve is used the vacuum breaker can
be used to bleed the air pocket.
CAUTION: When bleeding an air pocket manually,
protect yourself from being burned with hot water.
Figure 3. If there is no tapping available on the
boiler, connect both the upper and lower equalizing
pipe into the vertical riser going to the radiation or to
the compression tank. IMPORTANT: The horizontal
equalizing pipe should be below the horizontal
run going to the radiation. If it is not, an air pocket
will be created and a vent or bleed will have to
be installed.
b. Test the Model 61 before leaving the site.
NOTE: If no Test-N-Check (TC-4) valves were used,
do this test before filling the system completely.
STEP 2 - Installation of the Model 61
Model 61 – For Hot Water Boilers with 1” (25mm) Equalizing Lines
INSTALLATION –
TOOLS NEEDED:
One (1) flathead screwdriver and two (2) pipe wrenches.
For float type controls it is recommended that Test-N-Check ® (TC-4) valves be used in the upper and
lower equalizing lines. They offer a functional means for testing the 61 control, and conform to the
ASME CSD-1 code.
STEP 1 - Determine the Location of the Low Water Cut-Off
VERTICAL RISER
TO RADIATION
HOT WATER
BOILER
MODEL
61
VERTICAL RISER TO RADIATION
OR COMPRESSION TANK
HOT WATER
BOILER
TC-4
TC-4
MODEL
61
HOT WATER
BOILER
AVAILABLE OPENING
IN TOP BOILER
AIR
VENT
MODEL
61
Figure 1 Figure 2
Figure 3
MM-214(C) 9/5/06 9:40 AM Page 4