fl'/V} McDonnell & Miller
V
a
xylem
brand
INSTRUCTION MANUAL
MM-319
REVISION
C
Replacement Instructions For Large Bellows Assembly
Part Nos. SA47-4 (341500) and SA47-104 (341900)
All Work Must be Performed by Qualified Personnel
(Please read all instructions carefully before starting work)
A
This product can expose you to chemicals including Lead, which is known to the
State of California to cause cancer and birth defects or other reproductive harm.
For more information go to: www.P65Warnings.ca.gov.
UPPER BODY
CASTING
@
,-----►
BODY GASKET
X;----...::�
FLOAT
O
VALVE & STRAINER
ASSEMBLY
�r---- STRAINER BASKEl
ASSEMBLY
To Remove Large Bellows Assembly
.
. .
1.
Disconnect electric power to No. 2 Switch. If control
is eauipped··,vith a switch. remcve !our screws (G}
and lift switch from control with wiring in place.
2. Close off water supply valve (L) and valve M (See
Diagram
1
on other side).With boiler cold, release
boiler pressure and remove cold water piping from
"IN" and "OUT" tappings.
3.
Drain water from boiler to a level below the lower
gauge glass connection.
4.
If control has blow-off valve on bottom of float
chamber (see illustration). open this valve and
drain water remaining in control and disconnect
blow-off piping.
5. Break unions (H) and (I) or equalizing pipe con
nections to float chamber then remove control from
boiler.
6. Remove large black ·y assembly (if so equipped).
7.
Mark two castings of float chamber ai flange so
both can be reassembled in correct position.
8.
Remove eight cap screws (j) and separate two
float chamber castings.
9.
Remove float nut (V} and unscrew float (0) from
float arm (T).
10.
With long nose pliers remove cotter pin (A) and
linkage pin (B) through opening.
11.
Take out four screws (P) and remove valve bracket
(0) from upper body casting (R). NOTE: Do not
loosen or remove screws (C) holding valve bracket
(0) to valve and strainer assembly.
12.
Remove large bellows assembly from upper body
casting (R).
