Overview of Primary Product

42
Boiler Controls
Boiler Controls
McDonnell & Miller
ABCDEFGHJKLMN
min. max. NPT NPT NPT
6
1
⁄2 (165)
14
(356)
1
3
⁄4 (45)
4
3
⁄4 (121)
3
3
⁄8 (86)
1
1
⁄8 (29)
3
⁄8
3
⁄4 5
1
⁄2 (140)
1
⁄4 9
23
⁄32 (247)
3
9
⁄16 (90)
2
1
⁄2 (64)
2
13
⁄16 (71)
• For residential and commercial applications
• For boilers of any steaming capacity
• Quick hook-up fittings provided
• Lever-operated, full port ball valve for easy blow down
• Adjustable BX outlet for easy installation
• Dual precision switches for dependable operation of the
low water cut-off and alarm or electric water feeder
• Optional features
– Low voltage switches for self-generating millivolt
circuits
– Manual reset switch
• Large float chamber
• Maximum steam pressure 20 psi (1.4 kg/cm
2
)
Series 67
Model 67-LQHU
(without quick
hook-up fittings)
A
C
D
B
E
F
H
K
G
J
Max Swing
M
N
L
C
H
K
G
J
Max Swing
M
N
B
E
F
Low Water Cut-Offs – Mechanical
For Steam Boilers
Series 67
Low Water Cut-Offs
Dimensions, in. (mm)
Ordering Information
Model Part Weight
Number Number Description lbs. (kg)
67 149400 Low water cut-off 10 (4.5)
67-G 149600 67 for millivolt service 10 (4.5)
67-LQHU 149500 67 without quick hook-up fittings 8 (3.6)
67-M 149700 67 w/manual reset 10 (4.5)
®
®
Electrical Ratings
Motor Switch Rating (Amperes)
Voltage Full Load Locked Rotor Pilot Duty
120 VAC 7.4 44.4
125 VA at 120
240 VAC 3.7 22.2
or 240 VAC