Product Overview

44
Boiler Controls
Boiler Controls
McDonnell & Miller
A BCDEF
Insertion
Model Length NPT
69 4
1
⁄8 (105)
169 3
1
⁄8 (79)
269 2
1
⁄4 (57) 1 (25) 4
1
⁄8 (105)
1
⁄8 (3) 2
1
⁄2 9
1
⁄2 (241)
369
1
3
⁄4 (45)
469, 569
1
3
⁄16 (30)
• For residential and commercial low pressure steam
boiler applications
• For boilers of any steaming capacity
• For mounting in 2
1
⁄2" NPT boiler side tappings
• Insertion lengths available in 1
3
⁄16 - 4
1
⁄8" (30-105mm)
• Packless bellows
• Adjustable BX outlet for easy installation
•
Dual precision switches for dependable operation of the
low water cut-off and an alarm or electric water feeder
• Optional low voltage switches for self-generating millivolt
circuits
• Maximum steam pressure 20 psi (1.4 kg/cm
2
)
Series 69
12
34
D
C
F
B
E
CUT-OFF
LEVEL
A
Low Water Cut-Offs – Mechanical
For Steam Boilers
Series 69
Built-in Low Water Cut-Offs
Dimensions, in. (mm)
Ordering Information
Model Part Weight
Number
Number
Description lbs. (kg)
69 153900 Low water cut-off w/4
1
⁄8" (105mm) 3.7 (1.7)
insertion length
69-MV-P
155000
69 w/millivolt switch
4.0 (1.8)
169
155100
69 w/3
1
⁄8" (79mm) insertion length
4.0 (1.8)
269
155200
69 w/2
1
⁄4" (57mm) insertion length
4.0 (1.8)
369
155300
69 w/1
3
⁄4" (45mm) insertion length
4.0 (1.8)
369-MV
155400
369 w/millivolt switch 4.0 (1.8)
469 155500 69 w/1
3
⁄16" (30mm) insertion length 4.0 (1.8)
569 155700 469 w/1
3
⁄16" (30mm) insertion length 4.0 (1.8)
w/
1
⁄4" NPT tapping
®
®
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