General Operation; Sequence Of The Dispensing Cycle (Non-Blenders); Lift-To-Start Models; Push-To-Start Models - Wayne Dresser Vista 1 Series Service Manual

The general operation is very similar for all dispensers with model numbers beginning with 1/V.
2.1.

SEQUENCE OF THE DISPENSING CYCLE (NON-BLENDERS)

2.1.1.

Lift-to-Start Models

• When the nozzle is removed from the nozzle boot and the lever is lifted, the constant
+5 VDC that the computer supplies to the nozzle 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.
• 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 lever is lowered, the nozzle switch goes back to the constant +5 VDC, the
sale is complete, and the nozzle is returned to the nozzle boot.
2.1.2.

Push-to-Start Models

• When the nozzle is removed from the nozzle boot, the constant +5 VDC that the
computer supplies to the nozzle switch goes to ground. At this point, one of the
lighted buttons (grade select, cash/credit, or push-to-start, depending model) will
flash indicating that one of the buttons must be pressed.
• When one of the lighted buttons is pressed the constant +5 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.
* 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.
February 1997

2. GENERAL OPERATION

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Part No. 920160 Rev A
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