Low Water Cut-Offs. Low Water Cut-Off - Electronic Probe Type (PS-800 Series For Steam Boilers) B28 18/01/13

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1 18/01/13 B28 Low Water Cut-Offs Low Water Cut-Off - Electronic Probe Type (PS-800 Series For Steam Boilers) For residential, commercial and industrial applications Test button No lock out with loss of power if probe is in water Red 'low water' and 'shorted probe' LED, Green 'power' and 'test' LED DOM feature (15 seconds), DOB feature (10 seconds) No blow down of control required when mounted directly onto boiler tappings 1.7VA power consumption 7000 ohm probe sensitivity Maximum ambient temperature 49C (120F) Maximum water pressure 15 psi Maximum water temperature 121C (250F) Switch Rating (Amperes) Full Load Locked Rotor (50 or 60 Hz) 120 or McDonnell & Miller PS or McDonnell & Miller PS-801-M-120* Replacement Probe 3/4" NPT Connection McDonnell & Miller *Comes with manual reset Replacement Probe Note: Do not use manual reset models with electric automatic water feeders

2 18/01/13 B29 Low Water Cut-Offs Low Water Cut-Off - Electronic Probe Type (For Hot Water Boilers) For residential, commercial and industrial applications Low maintenance with no moving parts to wear, stick or hang up Test button allows the burner circuit and control to be tested without lowing the water level Models with manual reset feature will not lock out in power failures and are recommended for use as secondary low water cutoffs on steam boilers Switch Contacts: Single pole, double throw Maximum pressure 160 psi (1 bar) NEMA 1 enclosure Vertical or horizontal mounting Description Input Voltage Input Currant Power Consumption Switch Ratings Auto Reset 60 MA 7 VA 5.8 FLA, 34.8 LRA Watts OEM170 Manual Reset, comes with Test Button 30 MA 4VA 5.8 FLA, 34.8 LRA Watts OEM550 Auto Reset, comes with Test Button 30 MA 4VA 5.8 FLA, 34.8 LRA Watts OEM650 Manual Reset 30 MA 4VA 5.8 FLA, 34.8 LRA Watts OEM750 Low Water Cut-Off - Electronic Probe Type (For Hot Water Boilers) For residential applications Electronic operation with advanced solid state design Features a test button and compact size for mounting in tight spaces May be installed directly into the boiler if suitable tapping is available or in the boiler piping using a standard 3/4" tee Wiring Options: Control Center, Aquastat, 24 VAC Transformer or Integrated Boiler Control Module. Uses molex connector. Power & Low Water LED indicators Maintenance: Remove every five years and clean all surfaces Maximum water pressure 50 psi Maximum water temperature 121C (250F) Power Consumption Switching Capacity Max Load 24 VAC 1 VA 50 VA 5 Apms Watts 1100W (999901) Low Water Cut-Off - Electronic Probe Type (For Hot Water Boilers) For residential applications Electronic operation Features test button, automatic reset & self cleaning probe No blow down required Power & Low Water LED indicators 20,000 ohm probe sensitivity Self cleaning probe Maximum ambient temperature 49C (120F) Maximum water pressure 160 psi Maximum water temperature 121C (250F) Power Consumption Load Switching Replacement Probe VAC 3.1 VA Replacement Probe. 3/4" NPT Connection 120 VAC McDonnell & Miller RB122E (144676) McDonnell & Miller

3 Low Water Cut-Off - Float Type (N50S Series For Hot Water Boilers) B30 Low Water Cut-Offs For residential, commercial and industrial low pressure process boiler applications Single switch assembly for burner service with extra terminal for line voltage single pole, double throw service Electronic operation Float chamber has 1" NPT female top and bottom connections SAN50S 120/240 VAC Alarm Circuit (Amperes) /24VAC 1/2-120VDC / Watts Replacement Float & Switch Assembly Complete Single Switch Assembly is interchangeable. Watts Maximum boiler pressure 50 psi. 1" connection N50S SAN50S

4 Low Water Cut-Offs Low Water Cut-Off - Mechanical Float Type (61 Series For Steam Boilers) B31 For residential and commercial low pressure steam boiler applications For boilers of any steaming capacity 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 Maximum steam pressure 20 psi 1" NPT equalizing pipes and blow down valve required *Motor Switch Rating (Amperes) Full Load Locked Rotor or McDonnell & Miller 61 Replacement s Head Mechanism (includes gasket & bolts) McDonnell & Miller 61-HD Head Mechanism (includes gasket & bolts) McDonnell & Miller 6667 Head Gasket (#1) McDonnell & Miller CO-12 Gasket (#2) McDonnell & Miller Float & Bellows Assembly (#3) McDonnell & Miller SA67-2 Switch (#4) McDonnell & Miller 11 Switch with manual reset (#5) McDonnell & Miller 11-M Switch for Millivolt service (#6) McDonnell & Miller 11-MV * 120VDC.3 Amp, 240VDC.15 Amp 61-HD 6667

5 Low Water Cut-Offs Low Water Cut-Off - Mechanical Float Type (63 Series For Steam & Hot Water Boilers) B32 For residential and commercial and industrial applications Heavy duty Includes No. 2 switch Maximum boiler pressure 50 psi *Motor Switch Rating (Amperes) Full Load Locked Rotor (60 Hz) 120 or McDonnell & Miller 63 Replacement s Head Mechanism with 2 Switch (includes gasket & bolts) McDonnell & Miller 63-HD 63-HD Head Mechanism with manual reset (includes gasket & bolts) McDonnell & Miller 63-M-HD Switch (#1) McDonnell & Miller 2 Switch with manual reset (#2) McDonnell & Miller 2-M Bellows Assembly (#3) McDonnell & Miller SA63-5 Gasket (#4) McDonnell & Miller CO-11 Float (#5) McDonnell & Miller SA63-30 Head Gasket (#6) McDonnell & Miller CO-12 Cam (#7) McDonnell & Miller CO-106 * 120VDC.5 Amp 63-HD 63-M-HD

6 Low Water Cut-Offs Low Water Cut-Off - Mechanical Float Type (64 Series For Steam & Hot Water Boilers) B33 For residential, commercial and industrial applications For boilers 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 Maximum boiler pressure 50 psi 1" NPT equalizing pipes required Motor Switch Rating (Amperes) Full Load Locked Rotor or McDonnell & Miller 64 Replacement s Head Mechanism (includes gasket & bolts) McDonnell & Miller 64-HD Float Assembly (#1) McDonnell & Miller SA64-30 Head Gasket (#2) McDonnell & Miller CO-12 Bellows Assembly - Includes Head Gasket CO-12 (#3) McDonnell & Miller SA64-2 Gasket (#4) McDonnell & Miller Switch (#5) McDonnell & Miller 11 No. 11 with manual reset (#6) McDonnell & Miller 11-M No. 11 for Millivolt service (#7) McDonnell & Miller 11-MV 64-HD

7 Low Water Cut-Offs Low Water Cut-Off - Mechanical Float Type (67 Series For Steam Boilers) B34 For residential and commercial applications For boilers of any steaming capacity Quick hook-up fittings provided Lever operated, full port ball valve for easy blow down Adjustable BX outlet for easy installation Dual precision switches for dependable operation of the low water cut off and alarm or electric water feeder Large float chamber Maximum steam pressure 20 psi Motor Switch Rating (Amperes) Full Load Locked Rotor or McDonnell & Miller 67 Replacement s Head Mechanism McDonnell & Miller 6667 Head Mechanism for Millivolt Service McDonnell & Miller 6667MV Upper Tube Assembly (#1) McDonnell & Miller SA66-35 Quick Hook Up Fittings (#2) McDonnell & Miller MA559 Gasket (#3) McDonnell & Miller Float & Bellows Assembly (#4) McDonnell & Miller SA67-2 Switch (#5) McDonnell & Miller 11 Switch with manual reset (#6) McDonnell & Miller 11-M No. 11 for Millivolt service (#7) McDonnell & Miller 11-MV Blow Down Valve (#8) McDonnell & Miller 14-B Blow Down Valve Gasket (#9) McDonnell & Miller MV

8 Combination Low Water Cut-Offs / Pump Controllers Combination Low Water Cut-Off /Pump Controller - Float Type (N50D Series For Hot Water Boilers) B35 For residential, commercial and industrial low pressure process boiler applications Dual switch assembly for line voltage burner service and independent low or high voltage alarm, feed valve or pump starter Electronic operation Float chamber has 1" NPT female top and bottom connections SAN50D 120/240 VAC Alarm Circuit (Amperes) /24VAC 1/2-120VDC / Watts Replacement Float & Switch Assembly Complete Dual Switch Assembly is interchangeable. Watts Maximum boiler pressure 50 psi. 1" connection N50D SAN50D

9 30/11/07 Combination Low Water Cut-Offs / Pump Controllers B36 Combination Low Water Cut-Off /Pump Controller - Mechanical Float Type (42S Series For Steam Boilers) For residential, commercial and industrial low or medium pressure steam boilers with separate water column For boilers of any steaming capacity Monel bellows provides corrosion resistance Single pole, single throw snap action switches Enclosed junction box protects switches Maximum pressure 50 psi Pump Circuit Rating (Amperes) Full Load Locked Rotor Alarm Circuit Rating (Amperes) Voltage Amps 1 1/2 120 or McDonnell & Miller 42S Replacement s Head Mechanism (includes gasket & bolts) McDonnell & Miller 42S-HD Snap Action Switch Assembly McDonnell & Miller **SWA-42S Head Gasket (#1) McDonnell & Miller CO-12 42S-HD SWA-42S **Snap switches must be replaced as an assembly. McDonnell & Miller recommends complete head replacement to eliminate the need for field replacement of the switch assembly. Switch assemblies are not interchangeable with other switch assembly models.

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11 07/23/04 Combination Low Water Cut-Offs / Pump Controllers B38 Combination Low Water Cut-Off /Pump Controller - Mechanical Float Type (150S Series For Steam Boilers) For commercial and industrial low or high pressure boiler applications For boilers of any steaming capacity Monel bellows provides corrosion resistance Mercury Free 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 & alarm actuation Maximum pressure 150 psi Pump Circuit Rating (Amperes) Full Load Locked Rotor Alarm Circuit Rating (Amperes) Voltage Amps 1 1/2 120 or McDonnell & Miller 150S Replacement s Head Mechanism with Snap Switch (includes gasket & bolts) McDonnell & Miller 150S-HD 150S-HD with manual reset McDonnell & Miller 150S-M-HD 150S-HD with maximum differential McDonnell & Miller 150S-MD-HD Snap Action Switch Assembly (includes mounting bracket & color coded terminal connection wires) McDonnell & Miller **SWA-150S Bellows Assembly (#1) McDonnell & Miller SA R Float & Rod (#2) McDonnell & Miller SA Head Gasket for raised head flange, 8 holes (#3) McDonnell & Miller H Cover (#7) McDonnell & Miller SWA-150S **Snap switches must be replaced as an assembly. McDonnell & Miller recommends complete head replacement to eliminate the need for field replacement of the switch assembly. Switch assemblies are not interchangeable with other switch assembly models. 150S-HD

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13 07/23/04 Combination Low Water Cut-Offs / Pump Controllers B40 Combination Low Water Cut-Off /Pump Controller - Mechanical Float Type (157S Series For Steam Boilers) For residential, commercial and industrial low or high pressure boiler applications For boilers of any steaming capacity Monel bellows provides corrosion resistance Float chamber with integral water column provided Mercury Free 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 & alarm actuation Maximum pressure 150 psi Pump Circuit Rating (Amperes) Full Load Locked Rotor Alarm Circuit Rating (Amperes) Voltage Amps 1 1/2 120 or McDonnell & Miller 157S Replacement s Head Mechanism with Snap Switch (includes gasket & bolts) McDonnell & Miller 150S-HD 150S-HD with manual reset McDonnell & Miller 150S-M-HD 150S-HD with maximum differential McDonnell & Miller 150S-MD-HD Snap Action Switch Assembly (includes mounting bracket & color coded terminal connection wires) McDonnell & Miller **SWA-150S Bellows Assembly (#1) McDonnell & Miller SA R Float & Rod (#2) McDonnell & Miller SA Head Gasket for raised head flange, 8 holes (#3) McDonnell & Miller H Cover (#7) McDonnell & Miller SWA-150S **Snap switches must be replaced as an assembly. McDonnell & Miller recommends complete head replacement to eliminate the need for field replacement of the switch assembly. Switch assemblies are not interchangeable with other switch assembly models. 150S-HD

14 05/21/04 B41 Water Feeders Water Feeder - Electric (101-A Series For Steam Boilers) For low pressure steam boilers with cold water feed Eliminates necessity to manually add water to the boiler Can be used with mechanical or electronic low water cut off controls Quick change replaceable cartridge valve and strainer Manual feed button solenoid Maximum water supply pressure 150 psi Maximum boiler pressure 25 psi Maximum inlet water temperature 49C (120F) Maximum power consumption 24VAC / Pressure Differential - psi Flow Rate - GPM McDonnell & Miller 101-A Replacement s Cartridge & Strainer Kit (#1) CTRD-101 Tetraseal O-Ring (#2) Transformer, 24V (#3) V-48 Strainer with Tetraseal O-Ring (#4) SA Round Port Pilot Action Style Before August 1995 Hex Port Cartridge Style After August 1995

15 B42 Water Feeders Water Feeder - Make Up (21 Series For Boiler Receiver Tanks) For boiler receiver tanks Direct mounting eliminates need for equalizing connections Proportional feed action Mounting Flange: 6 bolt holes (7/16") on a 5 3/4" bolt circle Soft seat provides positive seal Maximum water supply pressure 150 psi Maximum water inlet temperature 49C (120F) Maximum vessel pressure 35 psi Description Make Up Water Feeder McDonnell & Miller 21 Replacement s Float (#1) McDonnell & Miller Gasket (#2) McDonnell & Miller Gasket (#3) McDonnell & Miller Gasket (#4) McDonnell & Miller Valve Assembly - Includes items 2,3,4 & 6 (#5) McDonnell & Miller SA21-6 Gasket (#6) McDonnell & Miller Strainer Assembly (#7) McDonnell & Miller SA51-9R Strainer Basket (#8) McDonnell & Miller SA21-38R Tetraseal O-Ring (#9) McDonnell & Miller Connector (#10) McDonnell & Miller

16 B43 Water Feeders Water Feeder - Make Up (25-A Series For Boiler Receiver Tanks) For boiler receiver tanks Float operated Proportional feed action Soft seat provides positive seal Seal between float chamber and valve chamber in not a positive seal Maximum water supply pressure 100 psi Maximum water inlet temperature 49C (120F) Maximum vessel pressure 35 psi Description Make Up Water Feeder McDonnell & Miller 25A Replacement s Head Mechanism McDonnell & Miller 25A-HD Gasket (#1) McDonnell & Miller F-26 Float (#2) McDonnell & Miller Diaphragm Seal Assembly with F-26 gasket (#3) McDonnell & Miller SA27T-75 Arm Assembly (#4) McDonnell & Miller SA25-5 Gasket (#5) McDonnell & Miller Gasket (#6) McDonnell & Miller Strainer Assembly (#7) McDonnell & Miller SA51-9R Tetraseal O-Ring (#8) McDonnell & Miller Strainer Basket (#9) McDonnell & Miller SA21-38R Valve Assembly (#10) McDonnell & Miller SA25A-6 Stem & Disc Assembly with SA51-9R strainer assembly (#11) McDonnell & Miller SA25A-15 Float Rod (#12) McDonnell & Miller 27T-9 25-A-HD

17 B44 Combination Water Feeder / Low Water Cut-Off Combination Mechanical Water Feeder / Low Water Cut Off (47-2 Series For Steam or Hot Water Boilers) For steam and hot water boilers with cold water feed Continuous maintenance of minimum safe water level, independent of electrical service Proportional feed action No. 2 cut off switch included Quick hook up fittings provided Quick change replaceable cartridge valve and strainer Maximum water supply pressure 150 psi Maximum water inlet temperature 49C (120F) Maximum boiler pressure 25 psi Motor Circuit Rating (Amperes) Full Load Locked Rotor (60 Hz) 120 or McDonnell & Miller 47-2 Replacement s Cartridge & Strainer Kit (#1) McDonnell & Miller CTRD-101 Valve, Cartridge & Strainer Assembly Kit (#2) McDonnell & Miller SA Tetraseal O-Ring (#3) McDonnell & Miller Strainer for Hex Port Valves - Includes tetraseal seal o-ring & bolts (#4) McDonnell & Miller SA Bellows and Bracket Assembly - Includes gasket (#5) McDonnell & Miller SA47-4 Gasket (#6) McDonnell & Miller Cam Assembly (#7) McDonnell & Miller CO-106 Switch (#8) McDonnell & Miller 2 Switch with manual reset (#9) McDonnell & Miller 2-M Quick Hook Up Fittings - Includes items 11, 12 & 13 (#10) McDonnell & Miller MA-259 Black 'Y' Assembly (#11) McDonnell & Miller SA Upper Quick Hook Up Fittings (#12) McDonnell & Miller SA Lower Quick Hook Up Fittings (#13) McDonnell & Miller SA Float Assembly (#14) McDonnell & Miller SA37-30 Gasket (#15) McDonnell & Miller Blow Down Valve - Includes gasket (#16) McDonnell & Miller 14-B Blow Down Valve Gasket (#17) McDonnell & Miller Units manufactured prior to August 1995 have a round port pilot valve and a strainer assembly. These valves and strainer assemblies can be replaced with the current hex port cartridge valve and strainer assembly See Next Page For Exploded View Round Port Pilot Action Style Before August 1995 Hex Port Cartridge Style After August 1995

18 Combination Water Feeder / Low Water Cut-Off Combination Mechanical Water Feeder / Low Water Cut Off (47-2 Series) - Continued B45