4
Part No. 920160 Rev A
February 1997
2.1.2.
Push-to-Start Models,
continued
•
The slow valve coil is energized two to six seconds, depending on option program-
ming settings, after the submersible pump relay is energized.
•
After a small amount of fuel has been dispensed, the fast valve coil is switched on
and both coils are now energized together.
•
In preset sales the fast coil is de-energized just prior to the final shut-off amount. The
slow valve coil is then de-energized when the final amount is reached.
•
When the nozzle is returned to the nozzle boot, the nozzle switch goes back to the
co5 VDC and the sale is complete.
2.2.
SEQUENCE OF THE DISPENSING CYCLE (BLENDERS ONLY)
•
When the nozzle is removed from the nozzle boot or the Lift to Start lever is raised,
the co5 VDC that the computer supplies to the nozzle switch goes to ground.
At this point the lighted buttons (grade select or cash/credit, depending on the model)
will flash indicating that one of the buttons must be pressed.
•
When one of the lighted buttons is pressed, the co5 VDC that is supplied to
the switch goes to ground. This signals the computer to begin its reset cycle.
•
When the dispenser receives an
Authorization
signal either from the control system
or from the Authorize switch in the dispenser, the correct submersible pump relay
will be energized.
*
•
The computer performs a self test and flashes eights, blanks, then resets to zeros, on
the main sale display.
•
After the dispenser resets, the proportional flow control valve(s) is energized with
just enough current to barely open the valve(s) and allow a slow flow.
After a small amount of fuel has been dispensed, the valve(s) is energized with
enough current to be in the fully open position and allow fast flow. During the sale,
the valve(s) will be continuously controlled with the proper amount of current to
provide the correct blend ratio and limit fuel flow rate to a maximum of 10 GPM.
**
•
In preset sales, the current received by the proportional flow control valve(s) is
reduced to the barely open position just prior to the final shut-off amount. The
valve(s) is then de-energized when the final amount is reached.
•
When the nozzle is replaced in the nozzle boot, the nozzle switch goes back to the
co5 VDC, and the sale is complete.
*
The submersible may have been energized in the previous step depending on the data setting in
programming Option 36. Refer to the Option Programming Manual part number 920205 for more
information.
** The maximum allowable flow rate in the United States is 10 gallons per minute.
Summary of Contents for Dresser Vista 1 Series
Page 1: ...1 Vista Series Blending and Non Blending Remote Dispensers SERVICE ...
Page 4: ...Part No 920160 Rev A February 1997 ...
Page 10: ...viii Part No 920160 Rev A February 1997 ...
Page 12: ...2 Part No 920160 Rev A February 1997 ...
Page 22: ...12 Part No 920160 Rev A February 1997 ...
Page 38: ...28 Part No 920160 Rev A February 1997 ...
Page 62: ...52 Part No 920160 Rev A February 1997 ...
Page 76: ...66 Part No 920160 Rev A February 1997 FIGURE 7 8 NOZZLE BOOT ASSEMBLY LIFT TO START ...
Page 77: ...67 February 1997 Part No 920160 Rev A FIGURE 7 9 NOZZLE BOOT ASSEMBLY PUSH TO START ...
Page 83: ...73 February 1997 Part No 920160 Rev A APPENDIX A TROUBLESHOOTING FLOWCHARTS ...
Page 110: ...100 Part No 920160 Rev A February 1997 ...
Page 111: ...101 February 1997 Part No 920160 Rev A APPENDIX B SERVICE INFORMATION AND CONNECTOR PIN OUTS ...
Page 134: ...124 Part No 920160 Rev A February 1997 ...
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