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Introduction 3. Connect input power of 120 VAC (supply& <br /> FE Petro's Dispenser Hook Isolation (DHI) is an electronic neutral)for STP-DHI or 240 VAC (supply& return) <br /> device that isolates dispenser hook signals from one for STP-DHIB to the input terminals. <br /> another. The STP-DHI assists in preventing: electrical 4. Connect the hook output of 120 VAC (supply& <br /> feedback from dispenser hook circuits during servicing, neutral)for the STP-DHI or 240 VAC (supply& <br /> the damage caused by cross-phasing of dispenser hook return)for the STP-DHIB to the output terminals. <br /> circuits, and some of the negative effects caused by <br /> dispenser voltage leakage on the hook signal circuit.The Note: The hook outputs of the STP-DHI(B)will be <br /> advantages of the STP-DHI are; connected to the hook signal terminals of the <br /> • No mechanical relays are required to achieve controller for the STP/IST. Some of FE Petro's <br /> isolation controllers are: STP-CB(B)S. STP-SC(B), IST-VFC. <br /> • It provides the ability to troubleshoot or service a 5. Connect the Dispenser Hook Signal power wires <br /> dispenser without disabling all dispensers. of 120 VAC (supply &neutral)for the STP-DHI or <br /> 240 VAC (supply& return)for the STP-DHIB to <br /> Note: The reference to"STP-DHI(B)" in this document terminals. <br /> refers to either the STP-DHI with a 120V dispenser <br /> hook signal or the STP-DHIB with a 240V dispenser 6. Repeat step 5 for each Dispenser Hook Signal <br /> hook signal. to be connected, with a maximum of up to 8 <br /> dispensers per STP-DHI(B). Multiple STP- <br /> WarningA Other power supplies may be DHI(B)'s may be connected together if more than <br /> present at the dispensers. Prior to 8 Dispenser Hook Signal terminals are needed, <br /> servicing, verify all power sources see Wiring Diagram 1 for details. <br /> are removed. 7. Connect ground wire to one of the green <br /> Installation Instructions grounding terminals on the STP-DHI(B) box. <br /> 1. Install STP/IST per STP\IST Fixed and Variable 8. Attach the cover to the base. <br /> Length Installation and Owner's Manual using the <br /> appropriate control box. Warning increases the risk of potentially Not installing a ground wire <br /> 2. Remove cover of the STP-DHI(B)and mount base lethal electrical shock and <br /> indoors to wall or other surface. <br /> equipment failure. <br /> Note: See Table 1 for wiring diagram specifics and <br /> reference the applicable diagram for the following <br /> installation instructions. <br /> Reference: For: <br /> Wiring Diagram 1 STP-DHI & STP-DHIB general wiring <br /> Wiring Diagram 2 STP-DHI-CBS or <br /> STP-DHIB-CBBS <br /> Wiring Diagram 3 STP-DHI-SCI or <br /> STP-DHIB-SCI <br /> Table 1 <br /> 3 <br />