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Heating Systems Bdier Feeders McDonnell & Miller, Inc. Safety Devices for Steam and Hot Water Heating Boilers . . . Liquid Level Controls 3500 North Spaulding Ave., Chicago 18, Illinois - The McDonnell line consists of (1) boiier water feeders, low water fuel cut-; offs and combined feeders and cut-offs for low pressure steam-boilers of all sizes and types, hand-fired or automatically fired; (2) pump controls, low water fuel cut-offs and low water alarms for steam boilers of any size or type with pressures up to 150 lbs; (3) boiler water feeders and low water fuel cut-offs for hot water heating boilers ;"(4) pressure relief valves for hot water heating boilers and domes tic hot water heaters, and temperature relief valves and combination T & P relief valves for hot water heaters; (5) make-up water feeders for receiving tanks and other liquid level controls for special applications; (6) water level con trols for humidity pans of warm air fur naces. Service Recommendations SAFETY FEEDERS FOR STEAM BOILERS Boiler Size Maximum Steam Pressure McDonnell product to use HAND FIRED JOBS Up to 5000 sq ft Above 5000 sq ft Any size 25 lbs 35 lbs 75 lbs No. 47 Boiler Water Feeder No. 51 Boiler Water Feeder No. 53 Boiler Water Feeder AUTOMATICALLY FIRED JOBS Boiler Water Feeder--Low Water Cut-off Combinations Up to 5000 sq ft' 25 lbs No. 47-2 Feeder Cut-off Combination Above 5000 sq ft 35 lbs No. 51-2 Feeder Cut-ofT Combination Any size 75 lbs No. 53-2 Feeder Cut-off Combination Boiler water feeders, feeder-cut-off combinations, arid-low water cut-offs . . . for low and moderate pressure steam boilers McDonnell & Miller, Inc. Heating Systems * Boiler Feeders. Safety Derices Boiler size Any size Any size Any size Service Recommendations CUT-OFFS FOR STEAM BOILERS Maximum Steam Pressure 20 lbs 50 lbs (Steam or Water) 150 lbs McDonnell Product to use No. 67 Low Water Fuel Cut-off No. 63 Low Water Fuel Cut-off No. 150 or No. 157 Low Water Fuel Cut-off McDonnell No. 67 Low Water Cut-off For automatically fired steam boilers of any size Maximum steam pressure, 20 lbs. Has McDonnell "Quick-Hook-Up" for installation in gage glass tappings; deep sediment chamber with large opening blow-off valve; packless non-binding construction; adjustable terminal box; snap-action twin switches. One switch can sound low water alarm, or control McDonnell No. 101 Electric Water Feeder; second switch cuts burner current if water level drops to M in. in gage glass. McDonnell No. 101 Electric Boiler Water Feeder for boilers up to 5000 sq ft capacity. For use with No. 67 Low Water Cut-off or with McDonnell "built-in" Low-Water Cut-offs which are standard equipment on many modern heating boilers. Its use converts cut-off into feeder cut-off combination. McDonnell Pump Control, Low Water Fuel Cut-off and Alarm Switch for steam boilers of any size; maximum steam pressure, 150 lbs. McDonnell No. 17-i McDonnell No. 47-2 Feeds water when necessary to maintain safe water level in boiler. If water falls to M in. in gage glass, cut-off switch cuts burner current until emergency has passed. Has "Quick - Hook - Up" for installation in gage glass tappings; "cool" feed valve; extra-deep sediment chamber; ASMEapproved blow-off valve. Also available for hand fired without No. 2 switch, as No. 47 Feeder. McDonnell No.Bl-S McDonnell No. 51-2 is same as No. 47-2, except it has greater feeding capacity for larger boilers, and is installed with 1 in. equalizing pipes instead of "QuickHook-Up." Also available for hand fired boilers without No. 2 switch, as No. 51 Feeder. For boilers operating at higher pres sures, from 35 to 75 lbs, use McDonnell No. 53-2 (or N1o. 53, without switch). 1432 The McDonnell No. 150 Pump Control, Cut-off and Alarm switch for high pres sure and temperature. Has two switches; one controls electric feed pump or electric valve in line to steam pump; second stops burner on greater float drop and completes alarm circuit. Under writers' Laboratories approved. No. 150 has automatic reset; for manual reset order No. 150-M. No. 157 is same as No. 150, but has integral water column which simplifies installation, assures ideal reproduction of boiler water level in float chamber, and provides effective direct blow-down. No. 157 has automatic reset; for manual reset order No. 157-M. 1433