Product Overview

40
Boiler Controls
Boiler Controls
McDonnell & Miller
ABCDEF
NPT NPT
9
15
⁄16 (252) 7
7
⁄16 (65) 1 6
1
⁄2 (165) 3
1
⁄8 (79) 1
A
B
E
F
D
CUT-OFF
LEVEL
C
SERIES 64
Low Water Cut-Offs – Mechanical
For Steam and Hot Water Boilers
Series 64
Low Water Cut-Offs
• Quick hook-up fittings provided for installation directly
into gauge glass tappings
Model 64-A
A
B
C
E
D
G
F
CUT-OFF
LEVEL
• For residential, commercial, and industrial boiler
applications of any steaming capacity
• Heavy Duty
• Adjustable BX outlet for easy installation
• Dual precision switches for dependable operation of the
low water cut-off and alarm or electric water feeder
• Packless bellows
• Optional manual reset available
• 1" (25mm) NPT equalizing pipes required
• Maximum boiler pressure 50 psi (3.5 kg/cm
2
)
• Use with TC-4 on hot water systems
Dimensions, in. (mm)
Ordering Information
®
Model Part Weight
Number Number Description lbs. (kg)
64 143600 Low water cut-off 11.3 (5.1)
64-A 143700 64 w/quick hook-up fittings 18.3 (8.3)
64-B 143800 64 w/float block 11.5 (5.2)
64-M 144250 64 w/manual reset 12.5 (5.7)
®
Electrical Ratings
Model 64-A
Low Water Cut-Offs
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
ABC D EFG
min. max. NPT NPT
2
5
⁄8 (66) 9
15
⁄16 (252) 4
1
⁄2 (113) 6
7
⁄8 (172) 13
3
⁄8 (339) 3
1
⁄8 (79) 1 1
Dimensions, in. (mm)
04_LWCOpgs 27-41 COLLECT 3/6/07 6:29 PM Page 40