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7

To prevent serious personal injury from steam blow down, connect a drain pipe to avoid exposure to steam
discharge.

Failure to follow this caution could cause personal injury or death.

!

WARNING

IMPORTANT: If the control (A) does not blow down
and/or the burner does not shut-off, close the blow
down valve (H),  immedialety shut off the boiler, and
correct the problem. Other equipment may be involved
and the system should be inspected by qualified per-
sonnel.

e. Allow the system to build to its normal operating pres-

sure and check for leakage around the mating surface
(G), the shaft (S), and the pipe opening (T).
1. If leakage occurs around the mating surface (G),

retighten the four (4) screws. If leakage continues, 
follow "Step 1" to remove the blow down valve (H).
Closely following the installation instructions, replace it.

2. If leakage occurs around the valve shaft (S), follow 

"Step 1" to remove the blow down valve (H). Closely 
following the installation instructions, replace it.

3. If leakage occurs around the pipe outlet (T), follow 

"Step 1" to remove the blow down valve (H) and 
verify that it has been properly assembled as shown 
in "Step 2-a". Inspect the blow down valve (H) for 
debris which may prevent it from completely closing 
or sealing. If leakage continues, follow "Step 1" to 
remove it. Closely following the installation instruc-
tions, replace the blow down valve (H).

T

G

S

G

H

f.

Open the blow down valve (H) to "blow down" the
control (A). The burner should shut-off.

A

H

g. Close the blow down valve (H) and check for

leakage by following the instructions in "Step 3"
section e.

H

INSTALLATION COMPLETE

Summary of Contents for McDonnell & Miller 14-B Series

Page 1: ...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...

Page 2: ...n 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 disconnec...

Page 3: ...ontrol 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 for eign matter which may obstruct the float s full range o...

Page 4: ...mble as shown J H Gasket Teflon Seal Teflon Seal Spring Ball Housing J b Position the blow down valve H onto the control s mating surface G So that it s handle K is acces sible and is able to swing th...

Page 5: ...4 20mm NPT blow down pipe M and screw it into the control N Tighten the pipe M with a pipe wrench P to approximately 47 ft lb 64 N m M P N g Turn the blow down valve handle K to its closed position K...

Page 6: ...he problem Other equipment may be involved and the sys tem should be inspected by qualified personnel d Verify that the burner is off and that the system is filling with water by observing the water l...

Page 7: ...akage continues follow Step 1 to remove the blow down valve H Closely following the installation instructions replace it 2 If leakage occurs around the valve shaft S follow Step 1 to remove the blow d...

Page 8: ...ter requirements PROCEDURE 1 Blow down the low water cut off when the water level is at its normal level and the burner is on Slowly open the blow down valve until it is fully open and observe the wat...

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