Specifications

144 Part Number STH12 9/10

Back-flow Preventer Maintenance

The integral carbonator in this unit is equipped with a

back-flow preventer designed to protect the potable

water supply from CO

contamination.

1. Shut OFF power to unit.

2. Shut OFF potable water supply to unit. Do not

shut OFF CO

supply.

3. Remove top cover panel of unit and disconnect

inlet fitting from back-flow preventer.

NOTE: The carbonator tank is still pressurized.

4. Observe inlet of backflow preventer #1 check for

any discharge. If there is no discharge, #1 check

is OK. Proceed to step 5. If there is discharge,

proceed to step 6.

5. Disconnect and carefully remove #1 check

assembly. Avoid losing any internal parts.

6. Observe inlet of #2 check for any discharge. If

there is no discharge, #2 check is OK. Proceed to

step 7. If there is discharge, proceed to step 5.

7. Shut OFF CO

supply and relieve pressure from

carbonator tank.

8. Remove back-flow preventer and install new

backflow preventer. Turn ON CO

supply and

check for leaks.

9. Check water supply strainer upstream of backflow

preventer. Clean out and/or replace as required.

10. Reconnect water lines and turn water supply ON.

11. Turn ON power to unit.

Important

The back-flow preventer must be checked at

least once every year to confirm that it is

functioning properly.