Product Overview

44
Boiler Controls
Boiler Controls
EFGH J
3
5
⁄16 (84) 9
15
⁄16 (252) 4
1
⁄8 (105) 3
7
⁄16 (87) 1 NPT
Series 150S
D
E
F
G
J
H
J

CUT-OFF
LEVEL
A
B
C
CUT-OFF
LEVEL
C 
Dimensions, in. (mm)
Ordering Information
Low Water Cut-Offs – Mechanical
For Steam Boilers
• For commercial and industrial low or high pressure
boiler applications
• For boilers of any steaming capacity
• Monel bellows provides corrosion resistance
• Snap action switches for high temperature service
– 1 Single pole, single throw switch for pump control
– 1 Single pole, double throw switch for low water
cut-off and alarm actuation
• Optional features
– Manual reset
– 2 Single pole, single throw switches
– 2 Single pole, double throw switches
– Float block
– BSPT threads
• Maximum pressure 150 psi (10.5 kg/cm
2
)
Model 150S-MD
Maximum differential operation
– Prevents nuisance burner shutdowns in low pressure
applications operating less than 50 psi (3.5 kg/cm
2
)
• For additional information see page 46
Series 150S
Low Water Cut-Off/Pump Controllers
Model Part Weight
Number Number Description lbs. (kg)
150S 171702 Combination low water cut-off/ 24.7 (11.2)
pump controller
150S-B 171903 150S w/float block 24.7 (11.2)
150S-B-M 172104 150S-B w/manual reset 24.7 (11.2)
150S-BMD 172002 150S w/float block and max. dif. 24.7 (11.2)
150S-BM-MD 172201 150S-BMD w/manual reset 24.7 (11.2)
150S-MD 171802 150S w/maximum differential 24.7 (11.2)
150S-M 172702 150S w/manual reset 24.7 (11.2)
150S-M-MD 172802 150S-M w/maximum differential 24.7 (11.2)
158S 178402 150S w/2 SPDT switches 26.3 (11.9)
158S-M 178502 158S w/manual reset 27.3 (12.4)
159S 178802 150S w/2 SPST switches 26.0 (11.8)
ABC D
5
7
⁄8 (149) 12
7
⁄16 (316) 6 (152) 13
1
⁄4 (337)
Electrical Ratings
Alarm Circuit Rating (Amperes)
Voltage Amps
120 VAC 1
240 VAC 1/2
Pump Circuit Rating (Amperes)
Voltage Full Load Locked Rotor Pilot Duty
120 VAC 7.4 44.4
345 VA at
240 VAC 3.7 22.2
120 or 240 VAC
®