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AC Input Module In VRM Version 1.2.0,the use of dispenser AC Hook signals is not required.The AC Input Module may be used to monitor the dispenser hook signals. Dispenser hooks are the signals from the dispensers that are normally used to activate the submersible pumps. For the VRM application they are also used to signal the start and end of a transaction for gasoline products only.Vapor Recovery does not apply to Diesel and Kerosene products so the hook signals for these grades do not need to be monitored. Dispenser Hook Signals are to be wired to the AC-Input Module and the installation directions are in the TS-5xxx Installation Guide(p/n 000-2150). Dispenser Interface Module The Dispenser Interface Module(TS-DIM)is used to acquire the volume of gasoline that was pumped during each transaction. Refer to the TS-5xxx Installation Guide(p/n 000-2150)for wiring the TS-DIM. Ullage Volume The VRM System uses ullage volume for performing vapor containment leak detection.The console gathers ullage volume from internal inventory probes or an external ATG.When using an existing ATG for collecting ullage,then the ATG must have an available RS-232 port and have the ability to respond to TLS-250 or TLS-350 inventory command. Relay/10A Relay Module Power to the dispensers will be controlled by the console in the event of a VRM Failure alarm.The dispenser power is to be controlled by the Relay Module per the installation directions in the TS-5xxx Installation Guide(p/n 000-2150). Electrical current through the Relay Module is not to exceed the maximum rated current listed on the module. If options in the dispensers will cause the current to exceed the rated current, including startup current,an external power relay will need to be used and it's coil controlled by the Relay Model. See the TS-5xxx Installation Guide(p/n 000-2150)for installation instructions for the Relay Module and 10A Relay Module. DTU Module The DTU Module is an optional device used to transmit the signals of the VPS and VFM to the console.The DTU will provide the ability to communicate over existing dispenser power lines thus eliminating the need to install field cable. For installation instructions of the DTU, refer to the TS-DTU Dispenser Retrofit Manual (pn 000-2146)and the Console DTU Installation Instructions(pn 000-0080). Alarms The user will be automatically notified of VRM or other system alarm conditions via the alarm LEDs and touchscreen display.An audible alarm will sound and the system can also be setup to print or E-mail alarms(Ethernet connection required). Dispenser power is controlled by the console and cannot be disabled. II-7 CANB Approved IOM 11-INCON Vapor Recovery Monitoring(VRM)-Executive Order VR-202