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4.4.2 Gasoline Vapor - (see FIGURE 3, page 11.) The processor is <br /> connected to the vent riser manifold by a 2" NPT galvanized pipe. <br /> Manifold to be mi.nimxn 12 ft. above grade. This pipe must rise <br /> continuous frim manifold connection to processor connectialI <br /> -"supported about every 8 ft. of its span to prevent trapping <br /> liquid in droops or sags in the pipe. If pipe frau vent riser <br /> manifold can not rise continuously to processor, install low point <br /> drain per Case 2, FIGURE 3. Pipe connection at the processor is <br /> with two l" NPT nipples, 1" NPT anion, and l" NPT to 2" NPT bell <br /> reducer. *Piping on the roof must be galvanized and may not be <br /> figerglass. <br /> Caution: Hold processor pipe train coupling. with wrench to <br /> Prevent twisting internal pipe train while connecting vapor piping. <br /> All gasoline tank vent risers must be connected to manifold: No <br /> vent risers frac► tanks not ppnt-uining gasoline are to be connected <br /> into the manifold. No diesel, no oil, no hoist vent, etc. <br /> 4.4.3 Current Sensing Relay - (To sense station's gasoline dispenser <br /> status.) This is an electrical connection, fram Terminal (1) to <br /> Terminal (8) in the processor, through the switch in the current <br /> sensing relay. This switch closes when any one or more gasoline <br /> dispensers is ON. Its purpose is to bypass the lesser vacuu¢n <br /> switch and cause the greater vacucsn switch to control when one or <br /> more customers are dispensing gasoline. The wiring do____es-not <br /> supply external electrical power to the processor. It is a <br /> passive jumper. The Current Sensing Relay may be located: anywhere <br /> convenient, usually in the station's main electrical panel where <br /> the product pump wires are. <br /> --------� Current Sensing Relay. <br /> Hot conductor #1 lead, (usually <br /> red) , one from each gasoline <br /> product pump. =wires Waist <br /> go through the hole in the sacra' <br /> direction (to avoid signal <br /> cancellation) . One pass through <br /> � for 115 V product puucp motor. <br /> Two passes (loops) for 220 V <br /> product motor. <br /> TO a <br /> To <br /> 5. WSTALLATION OF ASSOCIATED EQUIPMENT: <br /> 5.1 Manifold the vent risers together at their tops and install the pressure/ <br /> vacutm valve per FIGURE 3, page 11. <br />