Overview of Primary Product
67
Boiler Controls
McDonnell & Miller
Boiler Controls
• For receiver tanks in commercial or industrial
applications
• Mounts directly on the receiver, eliminating need for
equalizing connections
• Quick-change replaceable cartridge valve and strainer
• Proportional feed action
• Mounting Flange – six
7
⁄16" (11.1mm) bolt holes on a 5
3
⁄4"
(146mm) bolt circle
• Maximum water supply pressure 150 psi (10.5 kg/cm
2
)
• Maximum inlet water temperature 120˚F (49˚C)
• Maximum receiver pressure 35 psi (2.5 kg/cm
2
)
Series 851
Make-Up Water Feeder
Water Feeders – Make-Up
Series 851
A
WATER LINE
C
B
D
E
F
Model 851-S
C
F
A
B
D
E
WATER LINE
Model 851-S
Make-Up Water Feeder
• Extended float and rod assembly
• Wider operating range
• Maximum water supply pressure 100 psi (7 kg/cm
2
)
• Maximum inlet water temperature 120˚F (49˚C)
• Maximum receiver pressure 35 psi (2.5 kg/cm
2
)
Dimensions, in. (mm)
Ordering Information
Model Part Weight
Number Number Description lbs. (kg)
851 136700 Make-up water feeder 14 (6.4)
851-S 136800 851 w/extended float & rod assy. 16 (7.3)
Capacities – Model 851-S
FEEDER DISCHARGE
DIFFERENTIAL PRESSURE IN POUNDS PER SQ. IN.
(Water pressure less boiler pressure)
10,000
lbs./hr.
9,000
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
0
0psi 10 20 30 40 50 60 70 80 90 100
(0)(kg/cm
2
) (.7) (1.4) (2.1) (2.8) (3.5) (4.2) (4.9) (5.6) (6.3) (7.0)
(4536)
(kg/hr.)
STEAM
Sq.Ft.
BOILER
hp
(Kilowatts)
40,000
36,000
32,000
28,000
24,000
20,000
16,000
12,000
8,000
4,000
0
290
(2843)
261
(2559)
232
(2274)
203
(1990)
174
(1706)
145
(1421)
116
(1137)
87
(853)
58
(569)
29
(284)
0
(4082)
(3629)
(3175)
(2722)
(2268)
(1814)
(1361)
(907)
(454)
(0)
M
a
x
i
m
u
m
C
a
p
a
c
i
t
y
C
a
p
a
c
i
t
y
a
t
S
w
i
t
c
h
C
u
t
-
O
f
f
20
gpm
18
16
14
12
10
8
6
4
2
0
ABCDEF
NPT
11
3
⁄4 (298) 4
15
⁄16 (125) 4
5
⁄8 (117) 3
9
⁄16 (90)
3
⁄4 3
7
⁄16 (87)
Capacities – Model 851
C
a
p
a
c
i
t
y
a
t
S
w
i
t
c
h
C
u
t
-
O
f
f
M
a
x
i
m
u
m
C
a
p
a
c
i
ty
FEEDER DISCHARGE
DIFFERENTIAL PRESSURE IN POUNDS PER SQ. IN.
(Water pressure less boiler pressure)
10,000
lbs./hr.
9,000
8,000
7,000
6,000
5,000
4,000
3,000
2,000
1,000
0
0psi 10 20 30 40 50 60 70 80 90 100
(0)(kg/cm
2
) (.7) (1.4) (2.1) (2.8) (3.5) (4.2) (4.9) (5.6) (6.3) (7.0)
(4536)
(kg/hr.)
STEAM
Sq.Ft.
BOILER
hp
(Kilowatts)
40,000
36,000
32,000
28,000
24,000
20,000
16,000
12,000
8,000
4,000
0
290
(2843)
261
(2559)
232
(2274)
203
(1990)
174
(1706)
145
(1421)
116
(1137)
87
(853)
58
(569)
29
(284)
0
(4082)
(3629)
(3175)
(2722)
(2268)
(1814)
(1361)
(907)
(454)
(0)
20
gpm
18
16
14
12
10
8
6
4
2
0
Dimensions, in. (mm)
A BCDEF
NPT
12
3
⁄4 (324) 4
15
⁄16 (125) 3
3
⁄16 (81) 3
9
⁄16 (90)
3
⁄4 3
7
⁄16 (87)