Product Overview

62
Boiler Controls
McDonnell & Miller
Boiler Controls
C
D
BA
E
F
CLOSING
LEVEL
C
D
BA
E
CLOSING
LEVEL
F
ABCDEF
NPT NPT NPT
18
1
⁄8 (206) 10
3
⁄8 (264) 5
3
⁄4 (146) 1
3
⁄4
Ordering Information
• For low pressure steam and hot water boilers larger than
5,000 sq. ft. (465m
2
) with hot or cold water feed
• Optional features
– No. 2 switch
– Manual reset
– Float block
• Proportional feed action
• Model 53 can be field upgraded with a No. 2 switch to
add low water cut-off function
• Maximum water supply pressure 150 psi (10.5 kg/cm
2
)
• Maximum inlet water temperature 120˚F (49˚C)
• Maximum vessel pressure 75 psi (5.3 kg/cm
2
)
Series 53
Series 53-2
Water Feeders – Mechanical
Series 53/53-2
Mechanical Water Feeders/Low Water Cut-Offs
Dimensions, in. (mm)
Model
Part
Weight
Number Number Description lbs. (kg)
53 136900 Mechanical water feeder 38.0 (17.2)
53-B
137400
53 w/float block
42.0 (19.0)
53-B-2
137500
53-B w/No. 2 switch
42.0 (19.0)
53-B-2-M
137600
53-B w/No. 2 switch & manual reset
42.0 (19.0)
53-2
137100
53 w/No. 2 switch 38.5 (17.5)
53-2-M 137200 53-2 w/manual reset 38.5 (17.5)
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
®
®
Capacities
Electrical Ratings
Motor Switch Rating (Amperes)
Voltage Full Load Locked Rotor Pilot Duty
120 VAC 10.2 61.2
125 VA at
240 VAC 5.1 30.6
120 or 240 VAC
60 Hz