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Preparation Note: A precision line test must be conducted before installing a leak detector for the first time. A precision line test is also recommended before replacing a leak detector that is having slow flow (tripping) problems to assure line integrity. Before commencing the installation of a leak detector, use safety cones, barricades, trucks, etc. Warning A to isolate the work area. STP-MLD-HC & -HCD units are designed to detect leaks from where the leak detector is installed Caution Zis and downstream of it. A leak in the piping upstream of the STP-MLD-HC or -HCD, which includes the pump, would require a second means of monitoring to be detected. Thus, install the STP- MLD-HC or-HCD as close to the pump as possible to minimize upstream piping. Adapter Tee Installation Instructions Note: If the Adapter Tee is already installed, skip ahead to Step 5. 1. Disconnect power to the submersible pump at the electrical supply box (if already installed). 2. Tag and lock out electrical circuit breakers so they are not accidentally turned on. If the electrical circuit breakers are accidentally turned on while installing a leak detector, there is Warning A the possibility of ignition of hydrocarbon vapors, and/or the installer being bathed in fuel, which could result in serious personal injury or death. ALWAYS tag and lock out breakers so they are not turned on accidentally. 3. Remove the plastic thread protectors from the inlet and outlet of the adapter tee, see Figure 2. Install the adapter tee into the pipeline with the inlet side 3" male NPT towards the supply pump and the 3" female NPT discharge to the dispensing equipment. Apply UL-classified non-hardening, non-toxic pipe thread sealant to all the NPT pipeline connections. The adapter tee is normally provided from the factory, with an adapter tee cover in the leak Warning A detector mounting port. Be sure the cover is properly installed prior to proceeding to step 4. Failure to do so could result in a leak of fuel contaminating the environment, property damage, and/or cause serious personal injury or death. 4. Turn power on at the load center and turn on the submerged pump at a dispenser and purge air from the system. Look for leaks at the parts just worked on. If there are any leaks, immediately turn off the power at the load center, tag and lock out the breaker, and repair the leaks. Leak Detector Installation Instructions Note: Before installing the leak detector, purge the system of any air by running the pump and delivering gasoline from each dispenser (starting with the dispenser farthest from the pump), until all air is removed. The leak detector will not work properly until all of the air is out of the system. 5. Disconnect power to the submersible pump at the electrical supply box. 6. Tag and lock out electrical circuit breakers so they are not accidentally turned on. If the electrical circuit breakers are accidentally turned on while installing a leak detector, there is Warning A the possibility of ignition of hydrocarbon vapors, and/or the installer being bathed in gasoline, which could result in serious personal injury or death.ALWAYS tag and lock out breakers so they are not turned on accidentally. 7. Remove the plastic o-ring protector from the bottom of the leak detector, see Figure 2. Relieve line pressure by using the manual pressure relief(if present), or by loosening a pipe plug Caution either on the line side of the submersible manifold or in the shear valve under a dispenser. Make adequate provision to trap the liquid that escapes to prevent contamination of the environment. Re-tighten the pipe plug or manual pressure relief. 4