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.

N

TIO

U

A

C

NING

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A

W

• Save these instructions for future reference.

• All work must be performed by qualified personnel trained in the proper application, instal­lation, and maintenance of plumbing, steam, and electrical equipment and/or systems in
accordance with all applicable codes and ordinances.

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.