2
The following Test Procedure is one of several that is recognized
throughout the United States for verifi cation of the functioning of
Backfl ow preventers.
The following procedure is not a specifi c recommendation. The
Watts series of test kits are capable of performing any of the
recognized Backfl ow test procedures.
Note:
For both of the following test, the TK-DL must be held at
the same level as the assembly being tested.
A. Flush TC #1 and #2.
B. Turn tester on (before connecting hose). Tester
must read all zeros. Close VA and VB.
Test No. 1 - Air Inlet
1.
Install high side hose between TC #2 and tester connection
A.
2.
Open VA then TC #2. Bleed hose, then close VA.
3.
Close shutoff valve #2 then #1.
Push - Print Head (wait) then Push -
Start Test
4. Slowly open VA when air inlet fl oat opens, push “hold” but-
ton for at least 2 seconds.
Record differential reading (must be 1 PSID or more). Close
VA.
Push - Stop Test
5. Close TC #2 and remove hose.
6. Open shutoff valve #1.
Test No. 2 - Test Check Valve
7. Install highside hose between TC #1 and tester connection
A.
8. Open VA then TC #1. Bleed hose, then close VA.
9. Close shutoff valve #1.
Push - Start Test
10. Open TC #2. When fl ow of water out of TC #2 stops, the
differential reading is the pressure drop. Record (must be 1
PSID or more).
Stop Test (Push Stop Test twice)
11. Close test cocks and remove tester. Return assembly to
normal operating condition.
Test Cock No. 1
Test Cock No. 2
800M4-QT
Test Procedure for Pressure Vacuum Breakers
IS-TK-DL.indd 2
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