Document oDgnOxR8BqQeyDgLnwoMNkaZ7

Healing Systems Boiler Feeders M-DONNELL & MILLER Safety Devices for Steam and Hot Water Boilers and Liquid Level Controls General offices: Wrigley Building, Chicago, 111. "Doing <me\yything woii PRODUCTS: Boiler Water Feeders; Feeder-Cut off Combinations; Low Water Fuel Cut-offs; Pump Controls, Low Water Alarms; Humidifier Water Level Controls; Safety Relief Valves for hot water heating boilers and storage tanks; Liquid Level Con trols for a wide range of services. Boiler Water Feeders--McDonnell boiler feeders protect steam boilers from low water by automatically supplying water to the boiler when and as needed. See illustrations and service data opposite. Feeder Cut-off Combinations--For automatically fired boilers the No. 2 Low Water Cut-off Switch is added to form a feeder-cut-off combination, like the No. 47-2, No. 51-2, etc. In such a combination the feeder takes care of the normal water requirements. In case of an emergency, such as excessive priming and foaming or failure of the pump, the low water cut-off switch stops the burner until emergency is passed. Electrical ratings of No. 2 Cut-off Switch: A.C.--% hp, 110-220 V.; D.C.-- 10 amp, 125 V. Low Water Fuel Cut-offs--If the feeder-cut-off combination is not desired, the No. 67 alone can be installed to de pendably stop the burner when low water threatens. Has two switches--one oper ates alarm or controls No. 101 Electric Feeder, other acts as low water cut-off. Rating (each switch): A.C.--% hp, 115-230 V; D.C.--J4 hp, 115 V. No. 61-2 Feeder-Cutoff Combination. For automaticallyfired boil ers above 5000 sq ft-- maximum steam Pres sure 85 lbs. No. 51 {without switch) for hand fired boilers. For pressures from 86 to 75 lbs use the No. 58 {Hand Firing) No. 6 8-2 {Automatic Firing). " Built-in ' ' Low Water Fuel Cut-offs-- chosen as standard equipment on modern jacketed boilers. Self cleaning to insure depend able operation. Should be speci fied with the boiler. No. 47-8 Feeder Cut-off Combina tion. For auto maticallyfired boil ers up to 5000 sq ft capacity--maxi mum steam pres sure 25 lbs. No. 47 is for hand fired boilers -- same service range, with out switch. For process boilers up to 5000 sq ft, with pressures up to 85 lbs use No. 147 {Hand Firing) or No. 147-8 {Auto matic Firing). No. 67 Low Water Fuel Cut-off. For automatically fired boilers of any size; maximum steam pressure 25 lbs. For high pressure jobs the No. 150 will serve-not only as a low water fuel cut-off but also as a pump control and low water alarm--for pressures as high as 150 lbs. Electrical ratings, Cut-off and Pump Con trol: A.C.--1 hp, 110-220 V; D.C.-- Hhp, 115-230 V. Alarm: A.C. or D.C.-- 1 amp, 110 V. Specify 150-M for manual reset low water cut-off. No. 101 Electric Water Feeder for use with No. 67 or Builtin cut-offs--converts into Feeder-Cut-off Combinations. Advanced Features--A notable ad vance in No. 47 and 67 is the deep sedi ment chamber, with large capacity, straight-through (A.S.M.E. Standard) blow-off valve. Other features of feeders and cut-offs include: Quick-Hook-Up; Cool feed valve; finer stainless steel valves; large area built-in strainers; double switch construction of the No. 67; electric boiler water feeders; self-cleaning built-ins. 1040 No. 150 Combina tion Pump Control, Low Water Fuel Cut-oft and Alarm, for steam pressures up to 160 lbs. Has two switches: one controls pump-- other stops burner and completes alarm circuit when water level falls to danger zone. McDonnell & Miller Healing Systems Baiter Feeders McDonnell Snap Action Safety Relief Valves McDonnell Safety Relief Valves are the' maximum gross Btu output. first to be rated in Btu capacity--in ability The series includes Nos. 29 and 129 for . to dissipate heat at their set relief pressure.. hot water heating boilers and the Nos. 229, Their "snap action" design was inspired 329 and 429 for domestic hot water heaters' by exhaustive research which proved that and tanks. The snap action mechanism the only proper solution to the problem of (Pat. No. 2,248,807) provides, for the first preventing explosions and losses of hot time, a precision-built means of opening water boilers, domestic hot water heaters, the valve wide at set pressure. Revolu and hot water tanks was to be found in a tionary features are hardened stainless valve that would have sufficient discharge steel cone instead of composition disc; long capacity at relief pressure to prevent lived bellows diaphragm; remarkable ease further pressure rise when the boiler or of testing; complete protection of working domestic water heater is operated at parts; many other refinements. No. 29 and No. 129 Safety Relief Valves for Hot Water Heating Boilers --are rated in Btu capacity so that they can be matched to the gross Btu output of the boilers on which they are used: No. 29 for heating boilers with gross heat output up to 156.000 per hour. No. 129 for heating boilers with gross heat output up to 350.000 per hour. Set relief pressure of both No. 29 and 129 is 29 lbs. When used in accordance with their ratings they will No. 29-129 prevent pressures over 29 lbs under all conditions-- even such an emergency as a bottled up system with all temperature-limiting devices inoperative and heat input at maxi mum. This is "safety the McDonnell Way." No. 229-329-429 Safety Relief Valves for Domestic Hot Water Heaters and Tanks Engineering fundamentals, confirmed by practical tests prove that there is just one simple rule to observe in protecting domestic hot water heaters and tanks: Keep the pressure below the maximum allowed by the manufacturer of the tank or heater and there will be no failures or explosions. To accomplish this, a relief valve must have capacity to dissipate the maximum heat to which the tank can be subjected. This means that it must be Btu-rated, just as for a hot water boiler, so that it can be matched to the service condition. Nos. 229,329 and 429 are so rated: Installation No. 29-129 No. 229 is for water supply pressure up to 50 lbs; handles approximate Btu output of 316,720. Inlet tapping 1 in.; outlet tapping %, in. No. 329 is for supply pressure up to 75 lbs; handles Btu output of 380,896. Inlet tapping 1 in.; outlet tapping */i in. No. 429 is.for'supply pressures up to 100 lbs; handles Btu output of 432,590. Inlet tapping 1 in.; outlet tapping ^ in. On Direct Fired Heaters Never forget the pressure control--not temperature control--is the fundamental safety measure. You can have pressure and break age without excess temperature, but you can't have an explosion at any temperature, unless you have excess pressure. No. 229, 329 and 429 are the first valves to be built and rated in such a way that they will prevent excess pressure under all conditions--assuming, of course, that their Btu rating is properly observed. On Storage Tank McDonnell No. 217 Humidifier Water Control No. 217. Complete with float chamber, tubing and saddle valve. No. 117. Same as 217, omitting tubing and saddle valve. No. 17. Float and valve only. --automatically maintains proper water levels in evaporation pans of warm air furnaces. New snap action eliminates tendency of former controls to become stopped up by foreign matter or to stick and become inoperative. This valve has only two positions--tight closed and wide open. When water falls in. in pan it snaps wide open feeding a full stream that flushes orifice. Closes leak-tight against any water pressure up to 150 lbs. 1041