Boiler Controls

153928 McDonnell & Miller PSE-802-U-24 Low Water Cut Off. The Series PSE-800 probe type LWCO uses patented technology to monitor changes in water conductivity. When defined parameters are exceeded the new PSE-800 makes a decision to shut the...

132800 McDonnell & Miller Water Feeder LWCO 47-2. Features: For steam and hot water boilers with cold water feed Continuous maintenance of minimum safe water level, independent of electrical service Proportional feed action Quick hook-up...

171702 McDonnell & Miller Hi Pressure Level Control 150S. McDonnell & Miller 150S Instruction Manual Features and Benefits For commercial and industrial low or high pressure Boiler applications For boilers of any steaming...

142400 McDonnell & Miller Mechanical Low Water Cut Off 63. Mechanical For Steam Boilers. Mcdonnell & Miller LWCO Series 63 Instruction Manual Features: For residential and commercial low pressure steam boiler applications For boilers...

144726 McDonnell & Miller RB-24SE-L Low Water Cut Off. This Item Usually Ships The Same Day!

115400 McDonnell & Miller FS6-3/4 - 3/4" Flow Switch-High Sensitivity. McDonnell & Miller FS6 Instruction Manual This McDonnell & Miller flow switch is for heavy duty applications where high sensitivity is required, such as water...

127100 McDonnell & Miller 25-A-HD Head Assembly. Features: For boiler receiver tanks Float operated Proportional feed action Soft seat provides positive seal Seal between float chamber and valve chamber is not a positive seal Maximum water...

120160 McDonnell & Miller FS7-4S - 1-1/4" Flow Switch With Stainless Steel Body 120160. Mcdonnell & Miller 120160 Instruction Manual Features: Universal design serves the widest variety of large pipe applications, including heating and...

181225 McDonnell & Miller Relief Valve 250-3/4-30 Relief Valve 3/4" NPT Features and Benefits: For tanks and hydronic heating systems Protects against over-pressure Minimizes hammering with flash steam Low differential pressure – 3...

149400 McDonnell & Miller 67 Mechanical Low Water Cut Off. Mcdonnell & Miller LWCO Series 67 Instruction Manual Mcdonnell & Miller LWCO Series 67 Submittal Sheet Features: For boilers of any steaming capacity Residential and...

114900 McDonnell & Miller FS4-3T2-3/4 - 3/4" Flow Switch With NPT Body Medium Flow Rate 114900. McDonnell & Miller FS4 Instruction Manual Features: For starting or stopping electrically operated equipment such as signal lights, alarms,...

McDonnell & Miller FS4-3D 1" Flow Switch 4-3 W/2 SPDT Switches 114550. McDonnell & Miller FS4 Brochure McDonnell & Miller FS4 Instruction Manual Universal design serves the widest variety of applications. For starting or stopping...

181905 McDonnell & Miller Relief Valve 250-3/4-60. Features and Benefits: For tanks and hydronic heating systems Protects against over-pressure Minimizes hammering with flash steam Low differential pressure – 3 psi (.21 kg/cm2) between...

123010 McDonnell & Miller Air Flow Switch Model AFE-1 Hazardous Environment Applications. Information: McDonnell & Miller AFE-1 Instruction Manual For industrial hazardous environment applications requiring a NEMA 7 (Class I, Division I,...

 149500 McDonnell & Miller Mechanical Low Water Cut Off 67-LQHU. Float Type Low Water Cut Off For Millivolt Service. Mcdonnell & Miller LWCO Series 67 Instruction Manual Mcdonnell & Miller LWCO Series 67 Submittal...

109423 Bell & Gossett ZoneTrol II AZ-1A Add-A-Zone. *Discontinued with no replacement. The Bell & Gossett ZoneTrol II AZ-1A snap-on relay box is an easy to install single zone pump controller that mounts directly on any Bell & Gossett wet...

1AV-3/4 (1/8) Armstrong AIR VENT 3/4"P  1/8". 1-AV—A cast iron air vent that uses a free-floating lever that closes positively, ensuring a leak tight closing under all conditions. This vent is good for low capacity air/gas venting up to...

140100 McDonnell & Miller Mechanical Low Water Cut Off 61. Mechanical For Steam Boilers. Mcdonnell & Miller LWCO Series 61 Instruction Manual Features: For residential and commercial low pressure steam boiler applications For boilers...

181525 McDonnell & Miller Relief Valve 250-3/4-50 - 3/4" NPT. Features and Benefits: For tanks and hydronic heating systems Protects against over-pressure Minimizes hammering with flash steam Low differential pressure – 3 psi (.21...

122800 McDonnell Miller Air Flow Switch Model AF1. McDonnell & Miller AF1 Flow Switch Instruction Manual For general purpose applications with medium and high velocity requirements: Paddle fits 8" (203mm) minimum duct size, or 6" (152mm) if...

A5345 Armstrong Air Vent For "B" Series Steam Traps. This air vent is for use with all Armstrong "B" series F&T traps with 15 to 30 pound operating pressures. This Item Usually Ships The Same Day!

113056 Bell & Gossett 4V Air Vent is a coin operated air vent that is specifically designed for the new types of radiators. A particular feature is that it projects only slightly, being almost flush with the radiator. Maximum working pressure: 150...

172806 McDonnell & Miller 150S-M Combo LWCO & Pump Controller. McDonnell & Miller 150S Instruction Manual Features and Benefits For commercial and industrial low or high pressure Boiler applications For boilers of any steaming...

 129302 McDonnell & Miller Pump Controller LWCO 42S. Instruction Manual Features: For Residential, Commercial, & Industrial low and medium pressure steam boilers with a separate water column  For boilers of any steaming...

115600 McDonnell & Miller FS6-1 - 1" Flow Switch-High Sensitivity. This McDonnell & Miller flow switch is for heavy duty applications where high sensitivity is required, such as water treatment systems, cooling systems for electronic circuits,...

110800 McDonnell & Miller Proportion Switch Only. Fits Model 93, 193 & 94, 194 LWCO's. Information: Mcdonnell & Miller General Catalog Mcdonnell & Miller Service Parts Catalog Mcdonnell & Miller Series 93-94 & 193-194...

144692 McDonnell & Miller RB-24E Low Water Cut Off. This Item Usually Ships The Same Day!

169400 McDonnell & Miller Water Feeder 101A-120v McDonnell & Miller 101-A Electric Water Feeder Instruction Manual Electric Water Feeder Features: For low pressure steam boilers with cold water feed Eliminates necessity to manually add...

 120060 McDonnell & Miller FS7-4J Flow Switch 1-1 4 BSTP. *Please note image is generic. McDonnell & Miller FS7 Overview McDonnell & Miller FS7 Instruction Manual Features: Universal design serves the widest variety of large...

110300 McDonnell & Miller Model 5 Reset Snap Switch for model number 93, 193, 94, and 194 controls. This Item Usually Ships The Same Day!

153916 McDonnell & Miller PS-802-U-24 Low Water Cut-Off. This model has been replaced and the new model is 153928 PSE-802-U-24. This Item Usually Ships The Same Day!

120603 McDonnell & Miller FS8-WG - 1" Flow Switch With Gold Plated Switch Contacts 120603. 120603 McDonnell & Miller Instruction Manual  Features: For general purpose applications with environmental exposure, or those requiring a...

115652 McDonnell & Miller FS6-W-1 - 1" Flow Switch With NEMA 4X Enclosure. McDonnell & Miller FS6 Instruction Manual This McDonnell & Miller flow switch is for heavy duty applications where high sensitivity is required, such as water...

11AV 38 Armstrong 3/4" Stainless Steel Air Vent 267PSI. The Armstrong all-stainless steel guided lever air vents have been developed to provide positive venting of air/gases under pressure. For pressures to 600 psig (41 bar) or specific gravity...

114642 McDonnell & Miller FS4-3DS 1" Flow Switch With Stainless Steel Body & 2 SPDT switches 114642. McDonnell & Miller FS4 Brochure McDonnell & Miller FS4 Instruction Manual Universal design serves the widest variety of...

123450 McDonnell & Miller Air Flow Switch Model AF3D. McDonnell & Miller AFE-1 Instruction Manual For general purpose low velocity applications where the most economical flow switch is desired. Paddle fits 8" (203mm) minimum duct...

195000 McDonnell & Miller TC-4 Test & Check Valves. Information: 195000 Mcdonnell & Miller TC-4 Instruction Manual Features and Benefits: For use on hot water boilers Simplifies ASME CSD-1A. code mandated testing of lowwater...

176902 McDonnell & Miller 157S-RL Hi Pressure Level Control. McDonnell & Miller 150S/157S Instruction Manual Specifications For boilers of any steaming capacity Monel bellows provides corrosion resistance Snap action switches for high...

153929-LWCO McDonnell & Miller PSE-802-RX2-24 Low Water Cut Off. The Series PSE-800 probe type LWCO uses patented technology to monitor changes in water conductivity. When defined parameters are exceeded the new PSE-800 makes a decision to shut...

129502 McDonnell & Miller 42S-HD Head Mechanism for 42S, 42S-A. *Please note image is generic. This Item Usually Ships The Same Day!