Xylem MM 315E Models 51, 51S and 53 Boiler Water Feeders Models 51-2, 51-S-2 and 53-2 Feeder Cut-Off Combinations - Manual (Page 6)

6
STEP 3 - Testing and Inspection
Blow-Down
Valve
Feeder
Valve
Closing
Level The feeder should be blown down after initial installa-
tion, before leaving site. It should also be blown down
as recommended in the Maintenance section of these
instructions.
• Burner should be on and water level above 'closing
level' of feeder.
• Slowly open the water feeder blow down valve, which
will lower the water level in the float chamber. As
water flows out the blow down pipe, you should begin
to hear the feeder valve open.
• If the feeder has a #2 switch, the burner should stop.
• Close the water feeder blow down valve. The water
level should return to a safe operating level and the
burner should turn on.
To prevent serious personal injury from steam pipe
blow down, connect a drain pipe to the control
opening to avoid exposure to steam discharge.
Failure to follow this caution could cause personal
injury.
! CAUTION
Swing check
TO BOILER
By-pass
valve
A
B
Make sure that the water level in the boiler is above the
closing level of the feeder.
Close valve 'A' and slowly open union 'B' to determine if
valve is leaking.
• If water is leaking from the union, the valve needs to
be serviced.
• If no water leaks from the union, the feeder operation
is not the cause of the flooding.
Broken Union Test
Blow Down of Feeder
E
D
B
H
x 4
A. Using a 1/2" socket wrench, unscrew the four (4) hex-head
bolts (B) that secure the strainer basket (H) to the valve
assembly (E).
B. Using a 13/16" socket wrench, unscrew the cartridge (D)
and remove.
C. Clean any debris (scale, rust, etc.) from strainer and cartridge.
Poppet inside cartridge must move freely. Replace if debris
cannot be removed or poppet does not move freely.
D. Lubricate cartridge o-rings using silicone type lubricant and
re-install.
E. Re-install strainer basket.
Series 51
Removal of cartridge and strainer for inspection and cleaning