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ISD Flow Meter Installation Guide Installation Steps - Vacuum Assist System Below Shear Valve Installation.s - Vacuum Assist System Below NOTE: The Vapor Flow Meter should be installed prior to setting the dispenser in place or prior to installing any vacuum assist retrofit kits. If retrofitting the vacuum assist system, follow all manufacturer's instructions. 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, if necessary. 3. If a retrofit vacuum assist kit will be installed, remove any hardware specified in the manufacturer's installation instructions. Do not install the retrofit assembly at this time. 4. Remove any unneeded field installed plumbing between the vapor shear valve and the vapor return line fitting. Figure 3 shows two example installations of the Vapor Flow Meter with the required lateral or wye fitting for running the TP -201.4 back pressure test. Approximately 3 inches of clearance is required on both sides of the piping to accommodate the width of the meter body. 5. Connect the lower flange to the pipe that is connected to the lateral or wye access fitting (see Figure 4). 6. Install the Vapor Flow Meter over the lower flange. 7. Connect the upper flange with serviceable screen above the Vapor Flow Meter. 8. Using a close nipple, thread the shear valve into the upper flange. 9. Install the vacuum assist retrofit kit, if required, following the retrofit kit manufacturer's installation instructions - or fit the dispenser to its permanent mounting points. 10. Using nipples, unions, and other plumbing as required, connect the vacuum assist outlet to the shear valve. 11. Route the wiring into the junction box via the supplied cord grip assembly. Connect the wires from the Vapor Flow Meter to the field wiring from the console and cap with wire nuts (see Figure 2). 12. 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.