Wayne Dresser Vista 1 Series, Service Manual

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February 1997 Part No. 920160 Rev A
7.2.4. Meter
1. Remove the four (4) bolts which secure the meter to the meter support.
2. Remove the meter. Note the position of the two (2) o-rings and replace with
new ones in the proper location. Also, note there is a check and pressure
relief valve between the meter and meter support.
3. Reinstall the meter, and the check and pressure relief valve, using the previ-
ously removed bolts. Take care that the o-rings remain in their proper posi-
tions.
4. Check operation and inspect for leaks.
7.2.5. Proportional Flow Control Valve Replacement (Blenders Only)
1. Disconnect the wire harness plug to the specific valve coil in the electronic
head.
2. Loosen the inlet and outlet tube connections to the valve. In some cases, it
may be helpful to loosen the inlet tube at its meter support connection.
3. Loosen the conduit locknuts at the vapor barrier.
4. Remove valve assembly from dispenser.
5. Remove conduit from existing valve coil and replace in new valve
assembly.
6. Install new valve assembly in dispenser using the reverse procedure. Be sure
to use new plastic flare washers in the valve ports.
7. Purge all air from dispenser and check for proper operation.
7.2.6. Check and Pressure Relief Valve Replacement
The check and pressure relief valve is located at the inlet to the meter between
the meter support casting and the meter.
The check and pressure relief valve is a non-serviceable assembly. If the new
valve fails, replace it. Failure Symptoms are: computer jump, crossflow or Error
Code 16.
Replacement Procedures:
1. Remove the four (4) meter mounting bolts.
2. Remove the meter from the meter support