Watts 995 Series Setup guide

• Installation • Service
• Repair Kits • Maintenance
LIMITED WARRANTY:Watts Regulator Company warrants each prod-
uctagainstdefectsinmaterialandworkmanshipforaperiodofoneyear
from the date of original shipment. In the event of such defects within
thewarrantyperiod, the Companywill,atitsoption,replaceor recondi-
tion the product without charge. This shall constitute the exclusive
remedy for breach of warranty, and the Company shall not be respon-
sible for any incidental or consequential damages, includ
Series
995/995RPDA
Reduced Pressure Zone Backflow Preventer/
Reduced Pressure Detector Assemblies
Sizes: 3" - 6"
For field testing procedure, send for IS-TK-DL,
IS-TK-9A, IS-TK-99E and IS-TK-99D.
For troubleshooting guide, send for S-TSG.
For other repair kits and service parts, send for
PL-RP-BPD.
For technical assistance, contact your local Watts
representative on back page.
N995/Z995, N995RPDA, Z995RPDA are identical in
construction to the 995/995RPDA Series, except
include short radius elbows between the backflow
preventer flange and the gate valve flange.
RP/IS-995/995RPDA
IMPORTANT: Inquire with governing authorities for
local installation requirements.
NOTE: For Australia and New Zealand, line strainers
should be installed between the upstream shutoff
valve and the inlet of the backflow preventer.
CALIFORNIA PROPOSITION 65 WARNING
WARNING: This product contains chemicals
known to the State of California to cause cancer
and birth defects or other reproductive harm.
(Installer: California law requires that this
warning be given to the consumer.)

2
Figure 1
Valve Size Typical Flow Rates Drain
(inches) as sized by floor Size
drain manufacturers
21⁄255 gpm 2
3 112 gpm 3
4 170 gpm 4
6 - 8 - 10 350 gpm 5
Basic Installation Instructions
Installation Note:
The flange gasket bolts for the
gate valves should be retight-
ened during installation as the
bolts may have loosened due to
storage and shipping.
Watts Series 995 Reduced Pressure Zone
Backflow Preventer
1. Backflow preventers must be installed in high-visibility locations
in order to allow for immediate notice of telltale discharge or
other malfunction. This location should also facilitate testing and
servicing and protect against freezing and vandalism.
2.
Installation procedures must comply with all state and local
codes.
3. Installing a backflow preventer in a pit or vault is not recom-
mended. An air gap below the relief port must be maintained so
as to avoid flooding and submersion of the assembly, which may
lead to a cross connection. Watts recommends installations in-
doors or above ground in an insulated enclosure. (Send for ES-WB)
4. A strainer should be installed ahead of the backflow preventer to
protect the discs from unnecessary fouling.
CAUTION: Do not install a strainer ahead of the backflow preven-
ter on seldom-used, emergency water lines (i.e. fire sprinkler
lines). The strainer mesh could potentially become clogged with
debris present in the water and cause water blockage during an
emergency.
5. Normal discharge and nuisance spitting are accommodated by
the use of a Watts air gap fitting and a fabricated indirect waste
line. Floor drains of the same size MUST be provided in case of
excessive discharge.
6. When a Series 995 backflow preventer is installed for dead-end
service applications, discharge from the relief vent may occur due
to water supply pressure fluctuation during static no-flow condi-
tions. A spring load soft-seated check valve may be required ahead
of the backflow preventer.
7. ASSEMBLY: If the backflow preventer is disassembled during in-
stallation, it MUST be reassembled in its proper order. The gate
valve with the test cock is to mounted on the inlet side of the back-
flow preventer. The test cock must be on the inlet side of the
wedge. Failure to reassemble correctly will result in possible water
damage due to excessive discharge from the relief port/vent and
possible malfunction of the backflow preventer.
8. Prior to installation, thoroughly flush pipe line to remove any for-
eign matter.
9. START UP at Initial Installations and After Servicing: The down-
stream shutoff should be closed. Slowly open upstream shutoff
and allow the backflow preventer to fill slowly. Bleed air at each
test cock. When backflow preventer is filled, slowly open the
downstream shutoff and fill the water supply system. This is nec-
essary to avoid water hammer or shock damage.
Location and Installation Considerations
#2 Test Cock #3 Test Cock #4 Test Cock
#2 Check
Relief
Valve
Sensing
Line
#1 Check
Short Cam
Arm
Long Cam Arm

3
Watts Series 995 Installation Instructions
Installation
A.Series 995 may be installed in a horizontal or vertical flow up posi-
tion (Z995 Series). The shutoff valve with the test cock is to be
mounted on the inlet side of the backflow preventer. The test cock
is on the inlet side of the shutoff valve.
B. The 995 should always be installed in an accessible location to fa-
cilitate testing and servicing. Check the state and local codes to in-
sure that the backflow preventer is installed in compliance, such as
the proper height above the ground. The backflow preventer must be
supported and is not designed to carry full weight of the stand pipe.
C. Water discharge from the relief valve should be vented in accor-
dance with code requirements. The relief valve should never be sol-
idly piped into a drainage ditch, sewer or sump. The discharge should
be funneled through a Watts air gap fitting piped to a floor drain.
D. Watts recommends a strainer be installed ahead of Watts Series
995 assemblies to protect the discs from unnecessary fouling.
*For additional information on Watts insulated enclosures send for ES-WB of ES-WBT
Start Up
E.The downstream shutoff should be closed. Open upstream slowly, fill the
valve and bleed the air through Test cock 2, 3 and 4. When valve is
filled, open the downstream shutoff slowly and fill the water supply sys-
tem. This is necessary to avoid water hammer or shock damage.
F.The installation of a Watts air gap with the drain line terminating above a
floor drain will handle any normal discharge or nuisance spitting
through the relief valve. However, floor drain size may need to be de-
signed to prevent water damage caused by a catastrophic failure condi-
tion. Do not reduce the size of the drain line from the air gap fitting.
G. Two or more smaller size valves can be piped in parallel (when ap-
proved) to serve a large supply pipe main. This type of installation is
employed where increase capacity is needed beyond that provided by a
single valve and permits testing or servicing of an individual valve with-
out shutting down the complete line.
The number of assemblies used in parallel should be determined by the
engineer’s judgement based on the operating conditions of a specific in-
stallation.
Indoors Above Ground
*Insulated Enclosure
Watts 995
Vertical
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12" min.
36" max.
Watts N995
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12" min.
36" max.
12" min.
36" max.
Air Gap
To Floor
Drain
Floor Drain
Relief Valve Vent
12" min.
36" max.
Watts Z995
Flow

4
Servicing First and Second Checks
1. Slowly open all ball valves to relieve air and water pressure.
After pressure is relieved, loosen bolts on groove coupler and
remove groove coupler and cover plate from valve body.
2. Remove #1 Check Assembly. Do not use Check Arm as a
handle to unscrew the Check. Insert lid bolts in 1st check seat
ring (see fig. 1), insert a long screwdriver or pry bar between
lid bolts. Gently apply pressure against the bolts and turn seat
assembly counter clockwise moving bolts hole to hole to main-
tain turning leverage (two additional bolts will eliminate need to
move lid bolts from hole to hole). Finish unscrewing by hand
and remove through top access port. Unscrew #2 Check (turn
counter-clock wise) by placing a long screwdriver across lid
Figure 1 Figure 2
bolts inserted in holes located in the 2nd check seat ring, simi-
lar in method used to remove 1st check and applying pressure
to loosen #2 Check. Finish unscrewing by hand.
3. To clean Check, locate the Check Arm opening stud on the out
let flange of the valve assembly. Slide the Arm over the stud
with the check threads facing downward (fig. 2). Tighten 1/4"
nut on stud to secure cam bar. Slowly pull the assembly out
ward to open check allowing exposure of the seat and clapper
contact area for cleaning. The assembly may be locked open by
aligning the holes in the cam bar and hinge arms and inserting
a rod (fig. 4).
REMOVING CHECK ASSEMBLIES (Before servicing be sure shutoff valves are closed)
Watts Series 995/995RPDA
Check Disassembly
Please use caution when disassembling check.
The check is a spring-loaded mechanical device.
Figure 3
Press down on the check assembly
to unload the cambar from hinge
arms and roller. Then place a thin
rod or screwdriver into a mainte-
nance hole in one hinge arm.
Figure 4
Using your free hand, swing the
clapper assembly away from the
seat. Align (A) lockout holes.
Figure 5
Remove 1 c-clip from the center
pivot pin. Withdraw the center pivot
pin from the clapper and the hinge
arms. Remove the clapper
assembly from the check assembly
module. Note: You may replace
this item as an assembly or you
may replace only the disc.
Disassemble the clapper by
removing 4 screws, disc retainer
and the clapper disc. Disc may be
flipped if sealing surface is dam-
aged.
Figure 6
Before reinstallation of check assembly, thoroughly clean O-ring groove and
lubricate O-ring with F.D.A. approved lubricant.
Screwdriver or Prybar
Screwdriver or Prybar
Cover Bolts
Check
Body
Check
3", 4" & 6" RP 1st Check Assmbly

5
Servicing First and Second Checks
Item Part Description Qty.
1. 1st Cam-Check O-ring (removable) 1
2. Clapper Assembly (removable) 1
3. Clapper Retaining Plate Screws (removable) 4
4. Clapper Retainer Plate (removable) 1
5. Clapper Disc (removable) 1
6. Pivot Arm Pin (removable) 2 c-clips 1
7. 2nd Cam-Check O-ring (removable) 1
Parts Table (figure 8)
Figure 8
Note: Align holes and insert
pin or small screwdriver to
hold in open position.
1
7
34
5
6
2

6
RELIEF VALVE SERVICE INSTRUCTIONS
1. Prior to beginning any maintenance work, shut down the water
supply to the unit.
2. The relief valve is an integral part of the lid assembly and may be
serviced when the lid assembly is removed from the body of the
valve.
3. The relief valve may be disconnected from the sensing line hose if
desired to enable easier access to all parts of the assembly.
REPLACING THE SEALING DISC
1. Unscrew the lower guide, (5) from the shaft (3).
2. Replace the sealing disc assembly (4).
3. Screw the lower guide (5) back into the shaft (3). The lower guide
will seal the assembly with pressure against the elastomer in the
sealing disc assembly (4).
Servicing the Relief Valve
COMPLETE DISASSEMBLY OF THE RELIEF VALVE
1. Remove the sealing disc as above.
2. Remove the dust cover (10) from the cover weldment (1).
3. Unload the internal spring by unscrewing the guide, shaft (9) us-
ing a socket wrench.
4. Draw the shaft out through the bottom of the diaphragm.
5. Remove the spring through the top of the cover weldment.
6. Remove guide O-ring (6).
7. Remove O-ring (12) from the guide shaft.
REASSEMBLY
1. Replace all O-rings
2. Reverse disassembly steps above.
Item Part Description Qty.
1. Cover 1
2. Diaphragm/Gasket 1
3. Shaft 1
4. Sealing Disc 1
5. Guide, Lower 1
6. O-ring 1
7. Support Disc 1
8. Disc, Diaphragm Stop 1
9. Guide, Upper 1
10. Cover, Dust 1
11. O-ring, Upper 1
12. Spring 1
Parts Table (figure 9)
Figure 9
10
9
11
12
61
8
7
2
3
4
5

Testing - Reduced Pressure Zone Backflow Preventers
Watts TK-DP
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 recognized Backflow test procedures.
For additional testing information send for IS-TK-DP/DL, IS-TK-9A and IS-TK-99E
A. Open TC #4 and flush test cocks Nos. 1, 2 and 3 on BF assembly,
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 connection 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 1⁄4turn). 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 differential pressure.
Close VB. Record pressure differential.
Stop Test (Push Stop Test twice)
13. Close test cocks and remove tester, return assembly to normal
operating condition.
RPZ
Test 1
RPZ
Test 2
RPZ
Test 3
Watts 995
Watts 995
Watts 995
VA
AB
VB
VA
AB
VB
VA
AB
VB
It is important that this device be tested periodically in compli-
ance with local codes, but at least once per year or more as ser-
vice conditions warrant. If installed on a fire sprinkler system
all mechanical 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
7

995/995RPDA Repair Kits
First Check Kit
EDP No. Kit No. Size For use w/Model #'s
888915 RK 995/995 RPDA CK1 3" - 4" 3" - 4" 995/995 RPDA
888916 RK 995/995 RPDA CK1 6" 6" 995/995 RPDA
Kits include: Complete #1 Check Assembly and Check O-ring.
Second Check Kit
888917 RK 995/995 RPDA CK2 3" - 4" 3" - 4" 995/995 RPDA
888918 RK 995/995 RPDA CK2 6" 6" 995/995 RPDA
Kits include: Complete #2 Check Assembly and Check O-ring.
Relief Valve Total Kit
888919 RK 995/995 RPDA VT 3" - 4" 3" - 4" 995/995 RPDA
888920 RK 995/995 RPDA VT 6" 6" 995/995 RPDA
Kit includes: Relief Valve Assembly, Cover Plate, Diaphragm, and all relief valve components.
Relief Valve Rubber Parts Kit
888921 RK 995/995 RPDA RV 3" - 4" 3" - 4" 995/995 RPDA
888922 RK 995/995 RPDA RV 6" 6" 995/995 RPDA
Kits include: RV Diaphragm, RV Disc, Lower O-ring, Upper O-ring.
First Check Rubber Parts Kit
888923 RK 995/995 RPDA RC1 3" - 4" 3" - 4" 995/995 RPDA
888924 RK 995/995 RPDA RC1 6" 6" 995/995 RPDA
Kits include: First Check Assembly O-ring, check disc, and (2) C-clips.
Second Check Rubber Parts Kit
888925 RK 995/995 RPDA RC2 3" - 4" 3" - 4" 995/995 RPDA
888926 RK 995/995 RPDA RC2 6" 6" 995/995 RPDA
Kits include: Second Check Assembly O-ring, check disc, and (2) C-clips.
Rubber Total Parts Kit
888927 RK 995/995 RPDA RT 3" - 4" 3" - 4" 995/995 RPDA
888928 RK 995/995 RPDA RT 6" 6" 995/995 RPDA
Kits include: First and Second Check Assembly O-ring, first and second check disc, (4) C-clips, RV Dia-
phragm, RV Disc, RV lower O-ring, RV Upper O-ring.
Cover Kit888929 RK 995/995 RPDA C 3" - 4" 3" - 4" 995/995 RPDA
888930 RK 995/995 RPDA C 6" 6" 995/995 RPDA
Kits include: Cover and Cover O-ring.
Air Gap Assembly
EDP No. Kit No.
439190 995AG 3" - 6"
Air Gap Assembly
Air Gap Fitting
8
8"

9
Problem Cause Solution
A. Assembly discharges from Fouled first check Disassemble and clean No. 1
differential relief valve during check valve
no flow condition. Fluctuating inlet pressure Control supply line water pressure.
Install a spring-loaded soft seated
check valve upstream of the back-
flow prevention assembly.
Outlet pressure higher than inlet Disassemble, clean #2 check valve
pressure & leak in No. 2 check valve & identify cause of back pressure
Leak through diaphragm Service relief valve
Pressure relief valve does not close See problem D
B. Assembly discharges from Pressure relief valve does not close See problem D
differential relief valve during a
flow condition.
C. Differential pressure relief valve Differential pressure across No. 1 Repair shutoff valves
does not open during test check valve stays above 2.0 psi
due to leaking outlet gate valve
Weak or broken relief valve spring Disassemble and replace relief
valve spring
Plugged hydraulic hose Disassemble and repair
D. Pressure relief valve Debris on sealing surface Remove relief valve and clean
does not close Plugged hydraulic hose Disassemble and clean
Damaged seat or rubber shutoff disc Remove relief valve assembly and
replace
Ruptured diaphragm Disassemble and replace diaphragm
Trouble Shooting Guide

10
No. TK-99D
Backflow Preventer Test Kit
Hand held digital test kit
designed to test PVB’s,
SVB’s, DCVA’s, DCDA’s, RP’s
and RPDA’s
For additional information, send
for S-TK-99D.
No. TK-9A
Backflow Preventer Test Kit
Especially made for testing all reduced
pressure zone backflow preventers. It
is easily connected to any RPZ enabling
accurate testing of “zone”and relief
valve opening differential fouled check
valves or similar problems that visual
inspections cannot locate.
Max. pressure 175 psi
Max. temperature 210°F.
Test kit contains: gauge, test valves,
hoses, adaptors, securing strap,
instruction guide and lightweight case.
For additional information,
send for IS-TK9A.
No. TK-DL
Test Kit for Backflow Prevention Products
TK-DL has Digital Print-Out and Computer
Download
An advanced piece of test equipment designed
to make pressure and differential gauges
obsolete in the testing of backflow preventers.
• Accuracy • Portability
• Versatility • Documentation
• Readability • Downloadable
Test kit contains hoses, adaptors, digital
print-out unit with complete instructions in
rugged case.
For additional information,
send for F-TK-DL.
No. TK-7
Backflow Preventer Test Kit
Tests the individual check modules of the
Watts No. 7 Residential Dual Check. Also
used to test No. 709 and 007.
For additional information, send for IS-TK7.
No. TK-99E
Backflow Preventer Test Kit
The Watts TK-99E has been designed for
simplified operator operation and rugged
reliability in a compact package. Offering the
latest in gauge technology, the Watts TK-
99E provides dependable accuracy when
testing pressure vacuum breakers, anti-spill
vacuum breaker, reduced pressure backflow
preventers or double check assemblies.
TK-99E for RPZ, DCVA, SVB and PVB
models, accurate to ±1% of full scale.
• A large 4.5" anti-parallax dial which
indicates descending measurement,
accurate to ±1% of full scale.
• Complete kit contains gauge with color-
coded valves and hoses, hose adapter,
shock cord for easy mounting, supply
pressure gauge. All contained in a
durable carrying case with room for tools.
For additional information, send for S-TK-99E.
WATTS TEST KITS
TK-DL With computer download.
No. TK-99E Anti-parallax dial for all RPZ, DCV, PVB and SVB.
No. TK-9A Analog differential gauge for all RPZ, DCV, PVB and SVB.
No. TK-99D Digital (Delta Lite™) for all RPZ, DCV, PVB and SVB
No. TK-7 Water column sight tube for Dual check and Double check valves
Watts Backflow Preventer Test Kits

11
NOTES