Knight Idex MX PLUS, Instruction Manual

Page: 9 / 12

Page 9 of 12 0901220 Rev: A (final 04/20)
FLEX - GAP ANNUAL CLEANING AND TEST PROCEDURES FOR UNITS INSTALLED IN CANADA
Each year, your chemical dispenser must be cleaned and its backflow prevention performance verified. As this device is an
end - of - line device (versus an in - line device) and evidence of effective backflow prevention is determined visually, a two -
minute pressure test is not necessary.
If the Flex - Gap device cannot readily be seen during the test procedure, the housing of the chemical dispensing unit must be
removed during testing. Apply the appropriate test procedure below as applicable for your chemical dispensing unit.
4 GPM VENTURIS
1. Fill discharge hose with water by opening the valve.
2. When water begins to exit the discharge hose turn off the water and raise the end of the hose above the Flex - Gap.
3. Observe that water is exiting the Flex - Gap.
4. If the water is exiting the Flex - Gap it has passed the test.
5. If the water is not exiting from the Flex - Gap, replace the Flex - Gap sleeve as per the instruction manual and re - test.
6. If the water is not exiting from the Flex - Gap after replacing the sleeve and re - testing, replace the complete Flex - Gap
assembly and re - test.
7. If the water is not exiting from the Flex - Gap after replacing the Flex - Gap assembly, disconnect the water supply and
replace the complete unit.
1 GPM VENTURIS
1. Remove the Fill Tube Spout and replace with a 4 - foot length of 1/2” ID hose.
2. Fill the discharge hose with water by opening the valve.
3. When water begins to exit the discharge hose, turn off the water and raise the end of the hose above the Flex - Gap.
4. Observe that water is exiting the Flex - Gap.
5. If the water is exiting the Flex - Gap, it has passed the test.
6. If the water is not exiting from the Flex - Gap, replace the Flex - Gap sleeve and re - test.
7. If the water is not exiting from the Flex - Gap after replacing the sleeve and re - testing, replace the complete Flex - Gap
assembly and re - test.
8. If the water is not exiting from the Flex - Gap after replacing the Flex - Gap assembly, disconnect the water supply and
repace the complete unit.