77X INSTALLATION & OPERATION MANUAL
771/772/773/774 MODELS
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9.3 Backflow Preventer Maintenance
The strainer portion of the backflow preventer must be removed and cleaned on an annual basis. To clean the device, turn
off the water supply and unscrew the filter housing (Figure 9.2). Clean any debris and replace the strainer. Turn the water
supply back on when finished.
9.4 Servicing the Product Tray
If the dispenser was installed following Section 4.3 (Installation for Easier Service) of this manual, then use the following
steps for servicing the product tray:
• Remove the drip tray (if not connected to drain plumbing), splash plate, and fluid control cover to expose the
product tray.
• Remove the two nuts holding the product tray down using a 7/16” socket or nut driver.
• Remove the ties taking up the slack in the wiring harnesses.
• Lift up on the tray and pull out. Depending on the desired tray extraction distance some of the pressure transducers
& solution solenoids may need to be disconnected.*
• Service the tray.
• Reassemble the dispenser in reverse order.
*For multi-flavor dispensers, pull out the tray about 4” and disconnect the pressure transducers, any electrical connections,
as well as the faceplate activation tubing and the flavor hoses before completely pulling out the tray to service.
Unscrew Cap and Remove
Strainer to Clean
Figure 9.2 Backflow Preventer
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