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ISD Flow Meter Installation Guide Installation Steps - Vacuum Assist System Above Shea( Valve installation Steps - Vacuum Assist System Above Shear Valve 1. Before installing this device, turn Off, tag/lock out power to the system, including console and submersible pumps. 2. Remove the dispenser's lower sheet metal doors to access the vapor plumbing. 3. Loosen any factory installed mounts and/or brackets necessary to provide room to disconnect the vacuum motor outlet plumbing. 4. Disconnect the factory installed plumbing between the outlet of the vacuum motors and the field installed plumbing above the vapor shear valve, if present (see example installation in Figure 1). Retain the manufacturers installed piping for later use. 5. Remove any unneeded field installed plumbing above the vapor shear valve. The Vapor Flow Meter with flanges attached can be used for sizing the required head space of approximately 8 inches. Approximately 3 inches of clearance is required on both sides of the piping to accommodate the width of the meter body. 6. Working through the vacuum motor mounting plate, if present, connect the upper flange to factory installed plumbing. Note that this -may need to be temporarily suspended across the vacuum motor mounting plate while the lower plumbing work progresses. 7. Install any plumbing and the lower flange that will connect between the outlet side of the Vapor Flow Meter and the shear valve or lower vapor return line. Note: Elbows should be kept to a minimum (straight vertical plumbing is preferable). To improve efficiency and to reduce the risk of liquid traps, all horizontal plumbing must be pitched to drain. 8. Clean all debris around the inlet and outlet plumbing prior to installing the Vapor Flow Meter. Do not blow compressed air through the Vapor Flow Meter to prevent damaging the internal screens. 9. Install the o -ring into the lower mounting flange. 10. Taking care that foreign material (chips, debris, sealant, etc.) does not enter the open piping or Vapor Flow Meter, carefully insert the inlet filter and then connect the Vapor Flow Meter to the upper flange. Note that the flow arrow on the side of the meter body must point down. - 11. Connect the lower flange to the Vapor Flow Meter. 12. Tighten any loose fittings and hardware 13. Route the wiring into the junction box via the supplied cord grip assembly. 14. Connect the wires from the Vapor Flow Meter to the field wiring from the console and cap with wire nuts (see Figure 2). 15. After all other ISD Vapor Flow Meters and the ISD Pressure Sensor are installed, pressurize the tank ullage space and vapor piping to at least 2 inches WC and test for leaks using leak detection solution.