. Reliable vacuum and vacu-vapor heating equipment . on Tank, and Auto-matic Electric Switch wired to motor and to fuse box. VacuumGauge is placed on Expansion Tank. Compound Gauge is in-stalled on the boiler. Strainer with check valve is installed onair line, between Expansion Tank and Pump. The globe valveC is furnished with the Strainer for cleaning; also for cleaningand bypassing system. A globe valve A is placed on air line,between Strainer and Pump, so Pump may be valved off whennecessary. The drain from Strainer and exhaust from Pump isusually piped to an open sewer. All connections mus
. Reliable vacuum and vacu-vapor heating equipment . on Tank, and Auto-matic Electric Switch wired to motor and to fuse box. VacuumGauge is placed on Expansion Tank. Compound Gauge is in-stalled on the boiler. Strainer with check valve is installed onair line, between Expansion Tank and Pump. The globe valveC is furnished with the Strainer for cleaning; also for cleaningand bypassing system. A globe valve A is placed on air line,between Strainer and Pump, so Pump may be valved off whennecessary. The drain from Strainer and exhaust from Pump isusually piped to an open sewer. All connections must be madeperfectly tight. The system should be thoroughly tested and cleaned, be-fore it is operated. Before operating valve C should be closed, and valvesA and B opened fully. As soon as fire under boiler is lightedthe Vacuum Pump should be started, and it immediately beginsto draw air from the system. The air is drawn through the Note:—Chart on page 80 shows another method of installing a n\of installing Hydraulic Pump and Equipment. STEAM SUPP. M A l_N VACUUM^?GAUGE fjf—~v it»Hmu 11 +3R-* ThisVacipre& WET Twenty-Four IATION OF RELIABLE AIR LINESATING EQUIPMENT Strainer, and is discharged into a sewer by the Pump. The Pumpoperates until the desired vacuum is created in the system;then it is stopped automatically by means of the AutomaticElectric Switch and Vacuum Controller. This is usually set tostop the Pump at 7 inches of vacuum, and start it again when thevacuum drops to 5 inches. If desired, a vacuum can be main-tained in the system when cold. The vacuum in the boiler enables steam to generate at lessthan 212° Fahrenheit. Heat is instantly pulled into all radiators,and when steam reaches the VaeUstats their thermal membersexpand, which closes them automatically, preventing escape ofsteam. When steam condenses in radiators the thermal memberscool and contract. This automatically opens the VaeUstats,permitting vacuum in Expansion Tank and air piping to drawout any ai
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