Xylem MM 315E User Manual
E
2
Determine which situation applies:
a. For models 51-2, 51-S-2 or 53-2 on steam boilers:
Always set the control to shut off the burner while
there is water visible in the gauge glass. This applies
when the gauge glass is directly mounted in the boiler
or on a water column.
b. For models 51, 51-S or 53 on steam boilers:
Set the line on the casting 3
1
/8" below the boiler
manufacturer’s normal water level.
c. For all models on steam process boilers when no
condensate is returned to the boiler: Set the line
on the casting 11/8" below the boiler manufacturer’s
normal water level.
Models 51 / 51-2, Models 51-S / 51-S-2 and Models 53 / 53-2 –
For Steam Boilers with 1” (25mm) Equalizing Lines
INSTALLATION –
TOOLS NEEDED:
One (1) flathead screwdriver and two (2) pipe wrenches.
STEP 1 - Determine the Location of the Feeder and/or Low Water Cut-Off
Operating Levels of 51/51-2,
51-S/51-S-2 or 53/53-2
Drip tight valve off – 11/8"
Casting line – 0”
Burner on –1/8" (±1/4")
Burner off –7/8" (±1/4")
Series 51 and 53 Operating Level
California Proposition 65 warning! This product contains chemicals known to the
•
state of California to cause cancer and birth defects or other reproductive harm.
Previous controls should never be installed on a new system. Always install new
•
controls on a new boiler or system.
Failure to fo
CAUTION:
•
A more frequent replacement interval may be necessary based on the condition of
the unit at time of inspection. McDonnell & Miller's warranty is one (1) year from date
of installation or two (2) years from the date of manufacture.
llow this warning could cause property damage, personal injury or death.
Casting
Line
Valve Off -11/8"
Casting Line - 0"
Burner On - 1/8" (± 1/4")
Burner Off -
7
/8" (± 1/4")
a. Using the criteria in Step 1,
determine the location of the
51/51-2, 51-S/51-S-2 or 53/53-2.
This applies when the gauge
glass is directly mounted in the
boiler or on a water column.
b. Use Figure 1 or Figure 2 as a
general guide.
c. Connect steam equalizing lines
to any available opening other
than steam flow line.
(Take off line).
d. Test the Model 51/51-2, 51-S/51-S-2 and 53/53-2 Before Turning it Over to the Owner
Open the blow-down valve while burner is operating. As the water level drops the feeder will begin to
add water. As the water continues to drop the burner will shut off (on the 51-2, 51-S-2 and 53-2 only).
STEP 2 - Installation of the Models 51/51-2, 51-S/51-S-2 and 53/53-2
3
Lower
Gauge
Glass
Connect to Return
Header on Boiler
Side of all Valves
1" Crosses
Gauge Glass
Level
Mark
1" Steam Equalizing Line
(Short as Possible)
1" Minimum Blow-down
Valve for Feeder
Float Chamber
1" Water
Equalizing Line
(Short as Possible)
Cold City Supply
Normal Water Line
Swing Check Valve
By-Pass
Feeder Casting Mark
(See Installation Location)
1" Crosses
Level
Mark
Water
Column
1" Steam Equalizing Line (Short as Possible)
1" Minimum Blow-down Valve
for Feeder Float Chamber
Normal Water Line
Feeder Casting Mark
(See Installation Location)
Connect to Return
Header on Boiler
Side of all Valves
Swing Check Valve
Cold City Supply
By-Pass
1" Water Equalizing Line (Short as Possible)
1" Minimum Blow-down Valve
Figure 1
Gauge Glass Mounted in the Boiler
Figure 2
Gauge Glass Mounted on a Water Column
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