Boiler Controls
Combination Low Water Cut-Offs/Pump Controllers
Series 150S/157S Low Water Cut-Offs/Pump Controllers
The Mcdonnell & Miller Series 150S/157S Low Water Cut-Offs/Pump Controllers for commercial and industrial low or high pressure boiler applications, for boilers of any steaming capacity.
McDonnel & Miller Other Series
- Low Water Cut Off- Mechanical for Steam Boiler
- Series 93,94/193/194 Low Water Cut Off/Pump Controllers
- Series 42S Low Water Cut Off/Pump Controllers
Optional Features
- Manual reset
- Float block
- BSPT Threads
Detail Specification
| Maximum pressure | 150 psi (10.5 kg/cm2) |
| Enclosure Rating | NEMA 1 General Purpose |
| Voltage | 120 VAC, 240 VAC |
| Full Load | 7.4 , 3.7 |
Low Water Cut-Offs
McDonnell & Miller Series 67 – Low Water Cut-Offs
Series 67 Low Water Cut-Offs – Mechanical for Steam Boilers, Dual precision switches for dependable operation of the low water cut-off and alarm or electric water feeder
McDonnell & Miller Other Series
- RB-122-E-Low Water Cut-Offs
- Series PSE-800-M Probe Type LWCO
- Series PSE Probe Type LWCO
- Series 767 – Low Water Cut-Offs
- Series 764 – Low Water Cut-Offs
- Series 69 – Built in Low Water Cut-Offs
- Series 64 – Low Water Cut-Offs
- Series 63 – Low Water Cut-Offs
- Series 61 – Low Water Cut-Offs
- Series 750 and 751P/752P Low Water Cut-Offs
Low Water Cut-Offs
McDonnell & Miller Series 67 – Low Water Cut-Offs
Series 67 Low Water Cut-Offs – Mechanical for Steam Boilers, Dual precision switches for dependable operation of the low water cut-off and alarm or electric water feeder
McDonnell & Miller Other Series
- RB-122-E-Low Water Cut-Offs
- Series PSE-800-M Probe Type LWCO
- Series PSE Probe Type LWCO
- Series 767 – Low Water Cut-Offs
- Series 764 – Low Water Cut-Offs
- Series 69 – Built in Low Water Cut-Offs
- Series 64 – Low Water Cut-Offs
- Series 63 – Low Water Cut-Offs
- Series 61 – Low Water Cut-Offs
- Series 750 and 751P/752P Low Water Cut-Offs
Detail Specification
| Material | 316 Stainless Steel, Aluminum Bronze, Buna-N, Cast Iron, Ductile Iron, Epdm Rubber, Teflon |
| Operating Temperature | Up to 350 F (180 C) |
| Process Connection Type | 150RF |
| Standards | API 609, ASME B16.34 |
| Valve Size | 5 inch, NPS 10 / DN 250, NPS 12 / DN 300, NPS 14 / DN 350, NPS 16 / DN 400, NPS 18 / DN 450, NPS 20 / DN 500, NPS 2-1/2 / DN 65, NPS 3 / DN 80, NPS 4 / DN 100, NPS 6 / DN 150, NPS 8 / DN 200 |
Flow Switches
Flow Switches: Liquid Flow
Series FS7-4 Industrial Liquid Flow Switches
Universal design serves the widest variety of large pipe applications, including heating and hydronic systems, air conditioning, refrigeration and process work. Paddles can be trimmed to suit application needs.
McDonnell & Miller Other Series
- General Purpose Liquid Flow Switch, Series FS250
- Series FS74-W Industrial Liquid Flow Switches
- Series FS74-E Industrial Liquid Flow Switches
- Series FS6 High Sensitivity Liquid Flow Switches
- Series FS5 General Purpose Liquid Flow Switches
Detail Specification
| Sizes | 1 1/4" NPT |
| Minimum Temperature | (Fluid or ambient) 32°F (0°C) |
| Maximum Temperature | 300°F (149°C) |
| Maximum Operating Pressure | 300 psi (21 kg/cm2) |
| 1000 psi (70 kg/cm2) – Stainless Steel models |
Flow Switches: Liquid Flow
Series FS8-W General Purpose Liquid Flow Switches
For general purpose applications with environmental exposure, or those requiring a water-tight, dust tight, or a NEMA 4X rated flow switch 1″ NPT. Sensitivity adjusting screw makes flow adjustment easy
McDonnell & Miller Other Series
- Series FS4-3T General Purpose Liquid Flow Switches
- Series FS4-3 General Purpose Liquid Flow Switches
- Series FS1 High Sensitivity Liquid Flow Switches
- Model FS6-W High Sensitivity Liquid Flow Switches
- Model FS1-W High Sensitivity Liquid Flow Switches
Detail Specification
| Size | 1" NPT |
| Optional Features | BSPT Threaads, Gold plated contacts |
| Minimum Temperature | 32°F (0°C) |
| Maximum Temperature | 225°F (107°C) |
| Maximum Operating Pressure | 160 psi (11.3 kg/cm2) |
Flow Switches: Liquid Flow
Series FS8-W General Purpose Liquid Flow Switches
For general purpose applications with environmental exposure, or those requiring a water-tight, dust tight, or a NEMA 4X rated flow switch 1″ NPT. Sensitivity adjusting screw makes flow adjustment easy
McDonnell & Miller Other Series
- Series FS4-3T General Purpose Liquid Flow Switches
- Series FS4-3 General Purpose Liquid Flow Switches
- Series FS1 High Sensitivity Liquid Flow Switches
- Model FS6-W High Sensitivity Liquid Flow Switches
- Model FS1-W High Sensitivity Liquid Flow Switches
Detail Specification
| Size | 1" NPT |
| Optional Features | BSPT Threaads, Gold plated contacts |
| Minimum Temperature | 32°F (0°C) |
| Maximum Temperature | 225°F (107°C) |
| Maximum Operating Pressure | 160 psi (11.3 kg/cm2) |
Valve
Pressure Relief Valve
McDonnell & Miller Series 250/260 Pressure Relief Valve
Good engineering practice calls for every hot water boiler to have a pressure relief valve. This spring-loaded valve must be able to release the boiler’s entire load at the boiler’s maximum operating pressure. The burner limit may be jumped-out or stuck in a manual position.
Sizes and Materials – Series 250
- 3⁄4″ – 1″ NPT – bronze body and seat
- 2″ NPT – cast iron body, brass seat
- EPDM rubber diaphragm and seat disc
Sizes and Materials – Series 260
- 1 1/2″ NPT Inlet and 2″ NPT Discharge– cast iron body and brass seat
McDonnell & Miller Other Series
- Series TC-4 Test-N-Check Valve
- Series 14-B Ball Type Blowdown Valve
Detail Specification
| Low Differential Pressure | 3 psi (.21 kg/cm2) between opening and closing |
| Maximum Temperature | 250°F (121°C) |
| Max Operating Pressure - Series 250 | range 30 – 125 psig (2.1 – 8.8 kg/cm2) |
| Max Operating Pressure - Series 260 | range 30 – 50 psig (2.1 – 3.5 kg/cm2) |
Water Feeder
Water Feeders
Series 47/247 Water Feeders
Continuous maintenance of minimum safe water level and independent of electrical service, for steam and hot water boilers with cold water feed. Proportional feed action.
McDonnell & Miller Other Series
- Series 101-A Electric Water Feeders
- WFE Uni-Match Electronic Feeder
- Series 25-A Make-Up Water Feeder
- Series 551-S Make-Up Water Feeder
- Series 53/53-2 Mechanical Water Feeder/LWCO
- Series 51/51-2 Mechanical Water Feeder/LWCO
- Series 51-S/51-S-2 Mechanical Water Feeder/LWCO
- Series 47-2/247-2 Mechanical Water Feeder/LWCO
Detail Specification
| Max Water Suply Pressure | 150 psi (10.5 kg/cm2) |
| Max Inlet Water Temperature | 120°F (49°C) |
| Max Vessel Temperature | 30 psi (2.1 kg/cm2) |
