7
Testing - Reduced Pressure Zone Assemblies
Watts TK-DL
The following Test Procedure is one of several that is recognized
throughout the United States for testing Backflow Preventers.
The following procedure is not a specific recommendation. The
Watts series of test kits are capable of performing any of the recog-
nized Backflow test procedures.
For additional testing information refer to literature IS-TK-DL, IS-TK-9A and IS-TK-99E
A.
Open TC #4 and flush test cocks No’s. 1, 2 and 3 on BF assem-
bly, then close TC #4.
B.
Turn tester on (before connecting hoses). Tester must read all
zeros. Close VA and VB.
Test No. 1 - Relief Valve
1. Install high-side hose between TC #2 and tester connection A.
2. Install low-side hose between TC #3 and tester con nec tion B.
3. Open TC #3 then VB. Now open TC #2 slowly, then VA. Close
VA then VB.
4. Close #2 shutoff valve.
5. Observe the apparent first check valve differential pressure (A - B).
6. Install bypass hose between VA and VB. Open VB and bleed air
by loosening hose connection at VA. Tighten hose connection
and close VB.
Push - Print Head (wait) then Push - Start Test
7. Open VA, then slowly open VB (no more than 1⁄4 turn). When
relief valve drips, push the “hold button” for 2 seconds. Record
reading (must be 2 PSID or more).
Push - Stop Test
8. Close VA and VB.
Test No. 2 - Test No. 2 Check Valve
9. Install bypass hose between VA and TC #4. Open VA, then
bleed air by loosening hose connection at TC #4. Tighten hose
connection. Close VA.
Push - Start Test
10. Open VB to reestablish pressure within the “zone”. Close VB.
11. Open TC #4, then open VA. If relief valve does not drip, record
second check valve as “close tight”.
Test No. 3 - Test No. 1 Check Valve
12. Open VB to reestablish first check valve dif fer en tial pressure.
Close VB. Record pressure differential.
Stop Test (Push Stop Test twice)
13. Close test cocks and remove tester, return as sem bly to nor mal
operating condition.
RPZ
Test 1
RPZ
Test 2
RPZ
Test 3
Series 994
A B
VA
VB
WARNING
!
it is important that this device be tested periodically in com pli ance
with local codes, but at least once per year or more as ser vice con
di tions warrant. if installed on a fire sprinkler system all me chan i cal
checks, such as alarm checks, single checks and backflow preventers
should be inspected internally every one to five years in accordance
with nFpa 13 a and nFpa 25
Series 994
Series 994
A B
VA
VB
A B
VA
VB
