Dover Wayne Helix WM048523 - NA Proportional Valve Replacement

6.8 NA Proportional Valve Replacement
On NA Helix dispensers, the valve coil and conduit are an assembly and not separately replace-
able. The valve, coil, wiring and potted conduit can be replaced as an assembly or just the valve
can be replaced. The valve is the same as the valve used on previous model series, except for
the distance between the pin wholes in the valve body. This change is to accommodate the new
valve pin used to secure the 24 mm tubes. See Fig 6.10.
To replace the valve:
1
Trip emergency shear valve and run a sale to drain the line and to relieve pressure.
2
Power down the dispenser and submersible pump at the circuit breaker inside the building.
3
Push down on the name plate on top of the coil, then remove clip and name plate.
4
Raise coil/conduit assembly up and rotate away from valve. Save spring washer under coil.
Note: Conduit inside the head is not locked down on the vapor barrier; therefore, the conduit
can be moved up and down.
5
Place a container under the valve to catch the fuel.
6
Remove product tube lock pin from valve and remove tube from valve.
7
Loosen (2) 10 mm screws securing the valve retaining plate to the meter, and rotate retaining
plate upward.
8
Pull valve out from meter.
9
Install new o-ring on new valve and on product tube, then install valve.
10
Reinstall tube into valve and reinstall the lock pin.
11
Reinstall spring washer and coil onto valve. Note: Ensure that magnet washer on the conduit
is pushed up against the bottom of vapor barrier as shown in Fig 6.10.
12
Power up dispenser and reset shear valve. Run sales to clear air from line, check for leaks
and test operation.
To replace only the coil/conduit assembly:
1
Power down the dispenser at the iGEM power switch inside the electronics head.
2
Disconnect valve coil wires at J3 on computer board.
3
Remove washer and rubber retainer from the top of valve conduit. Save parts.
4
Push down on the name plate on top of the coil, then remove clip and name plate.
5
Raise coil/conduit assembly up and rotate away from valve. Save spring washer under coil.
6
Pull conduit and wires down from vapor barrier, then remove magnet washer from conduit.
7
Install the magnet washer on the new conduit.
8
Install new assembly in reverse order and reconnect wires. Note: Slide the magnet washer
up the conduit until it is up against the bottom of vapor barrier as shown in Fig 6.10.
9
Power up dispenser and test operation.
88 WM048523 Rev 08 01/2019
6 Replacement Procedures