Xylem MM 702E User Manual

INSTRUCTION MANUAL
MM-702F
Series 14-B Ball Type Blow Down Valve
Applications:
For Series 47, 67, and 70 boiler control blow down valve replacement.
• Before using this product read and understand instructions.
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• Save these instructions for future reference.
WARNING
!
EASY OPEN HANDLE!
Series 14-B
• To prevent serious burns, wear heat resistant gloves when opening and closing valves, or handling hot equipment.
• To prevent serious burns, allow the control and surrounding equipment to cool to 80˚F (27˚C) and allow pressure to release to 0 psi (0 bar) before servicing.
• When flushing control (blow down), hot water and steam will flow out. To prevent serious personal injury, connect a drain pipe to the control opening to avoid exposure to steam discharge.
To prevent flooding,do not puncture float.
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 follow this warning could cause property damage, personal inj ury or death.
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.
2
b. Shut off the inlet water supply by closing the make
up water feed valve.
c. Open the blow down valve (D). Drain
the control (A) to a point where no addi­tional water can enter the control. Let the control (A) and surrounding equip­ment to cool to 80˚F (27˚C) and allow pressure to release to 0 psi (0 bar).
A
D
A
D
d. Using a pipe wrench (B), remove the
blow down pipe (C) from the existing blow down valve (D).
B
D
C
C
D
B
STEP 1 - Preparation
INSTALLATION –
TOOLS NEEDED:
One (1) flathead screwdriver, one (1) scraper, one (1) pipe wrench, one (1) hammer, and pipe sealing compound.
a. Shut off the boiler and disconnect the power to the
entire boiler system.
OFF
ON
OR
OR
To prevent serious burns, wear heat resistant gloves when opening and closing valves, or handling hot equipment.
To prevent serious burns, allow the control and surrounding equipment to cool to 80˚F (27˚C) and allow pressure to release to 0 psi (0 bar) before servicing.
Failure to follow this caution could cause personal injury.
!
CAUTION
3
h. Using a scraper, remove the old gasket (F)
from the control (A). The gasket sealing sur­face (G) must be smooth and clean for proper installation.
G
F
A
e. Using a flathead screwdriver (E),
loosen the four (4) screws.
E
E
f. Remove the blow down valve (D) from
the control (A). If necessary, use a hammer to tap it loose.
D
D
A
A
g. Inspect the float chamber (E) for debris.
Carefully remove any debris, mud, or other for­eign matter which may obstruct the float's full range of motion, without puncturing the float.
E
OR
OR
To prevent flooding, do not puncture float.
Failure to follow this caution could cause property damage.
!
CAUTION
NOTE: For spring type blow down valves, the spring mechanism must be removed from the control body.
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