Install Instructions

2
The 69 Series Built-in Low Water Cut-Off is furnished
with a threaded barrel casting which fits right into a
2 1/2" tapping provided by some boiler manufacturers
in the side of the boiler. Selection of the particular
model depends upon the insertion length into the
boiler (see chart). Order the built-in which provides
maximum insertion within the boiler.
0
2
0
4
1
0
3
0
0
2
0
4
1
0
3
0
0
2
0
4
1
0
3
0
SCHEMATIC OF TWIN SWITCH
INTERNAL OPERATION
NORMAL WATER LEVEL
FEEDER OR ALARM
OPERATING LEVEL
LOW WATER CUT-OFF
OPERATING LEVEL
NEUTRAL WIRE
NEUTRAL WIRE
HOT WIRE
HOT WIRE
TO BURNER
TO ALARM
SAFETY
SWITCH
0
2
0
4
1
0
3
0
USED AS MAIN LINE SWITCH
Diagram 1
Diagram 2
TO LINE
TO BURNER
STARTER
SAFETY
SWITCH
L1
L2
L3
0
2
0
4
1
0
3
0
USED AS PILOT SWITCH IN SERIES WITH
HOLDING COIL OF AUTOMATIC STARTER
NEUTRAL WIRE
TO
TWO WIRES OF 101A
OR TO ALARM CIRCUIT
HOT WIRE
TO BURNER
JUMPER
SAFETY
SWITCH
0
2
0
4
1
0
3
0
USED WITH MODEL 101 ELECTRIC
WATER VALVE OR IN ALARM CIRCUIT
Diagram 3 Diagram 4
IMPORTANT: Low water cut-off circuit of the 69 series must be electrically wired in series with all other boiler
limit operating controls.
Based on desired usage, connect wires from low water cut-off to appropriate control/alarm.
OPERATION
Maximum Steam Pressure: 20 psi (1.4 kg/cm
2
)
Electrical Ratings
Motor Switch Rating (Amperes)
Voltage Full Load Locked Rotor Pilot Duty
120 VAC 7.2 43.2
125 VA at
240 VAC 3.6 21.6
120 or 240 VAC
ABCDEF
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)
Dimensions, in. (mm)
12
34
D
C
F
B
E
CUT-OFF
LEVEL
A
AA
NOTE: MV models are rated at 24 VA @ 24 VAC to 120 VAC