Product Overview

ManualsBrandsMcdonnell & Miller ManualsHeating Supplies150S-MD, Float Type, Combo LWCO & Pump Controller, w/ Maximum Differential (Steam)

Boiler Controls

McDonnell & Miller

EFGH J

⁄16 (84) 9

⁄16 (252) 4

⁄8 (105) 3

⁄16 (87) 1 NPT

Series 150S

CUT-OFF

EVEL

UT-OFF

LEVEL

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

)

• For new electronic 150E Series see page 37

Model 150S-MD

Maximum differential operation

– Prevents nuisance burner shutdowns in low pressure

applications

• Maximum operating pressure 50 psi (3.5 kg/cm

)

• For additional information see page 48

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

⁄8 (149) 12

⁄16 (316) 6 (152) 13

⁄4 (337)

Electrical Ratings

Alarm Circuit Rating (Amperes)

Voltage Amps

120 VAC

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

with MERCURY FREE

Snap-Action

Switches

Summary of content (1 pages)

PAGE 1
Boiler Controls McDonnell & Miller Low Water Cut-Offs – Mechanical For Steam Boilers Series 150S ® ® Low Water Cut-Off/Pump Controllers • For commercial and industrial low or high pressure boiler applications • For boilers of any steaming capacity • Monel bellows provides corrosion resistance Boiler Controls D E F J • 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 actuatio