Install Instructions

Field Testing Procedure
Series 9D/LF9D Backflow Preventer with Intermediate
Atmospheric Vent
EQUIPMENT REQUIRED: Valve must be installed per drawing and one (1) flexible hose
with adapters furnished for testing.
Installation Providing for Field Testing
Test No. 1
Purpose: To check operation of air break.
Requirements: When supply pressure drops to atmospheric, air break must relieve pressure between both
checks.
Procedure: Close shutoff valves No. 1 and No. 2. Open test cock No. 2.
Observe: Some water should drain from vent indicating that diaphragm has lifted off its seat and
opened the chamber between the checks to atmosphere.
Test No. 2
Purpose: To test for tightness of second check Valve.
Requirement: Second check must be drip tight when pressure is applied to downstream side of valve.
Procedure: Close shutoff valves No. 1 and No.
2. Open test cock No. 2. Connect
flexible hose from test cock No.
1 to test cock No. 3. Open test
cock No.1 and No. 3 admitting line
pressure to downstream side of
second check valve. Water must
not drip continuously from vent.
If water drips continuously from
vent, second check is leaking.
Series 9DM2, LF9DM2,
9DM3, LF9DM3
Dual Check with Atmospheric Vent
Sizes:
1
⁄2",
3
⁄4" (15, 20mm)
Note: Model 9DS/LF9DS - Remove union connections before sweating
•The9D/LF9DDualCheckwithAtmosphericVentisdesignedforuseonnon-health
hazard,continuouspressure,pointofuseapplicationsforprotectionagainstbacksi-
phonageandbackpressure.Installinaccordancewiththelocalcodes.
•Forthebestsystemperformance,installonthefreshwaterfeedlinebeforeanypres-
sureregulators(suchastheWattsSeries1156onaresidentialboilerapplication).
•Flushthelinebeforeinstallingtheunittoremoveanysolder,fluxorpipechips.Clean
thestrainereverysixmonthsorasconditionsrequire.
•Somedischargeisexpected,particularlyonstart-up,untilallseatingsurfacesseal.
Continuousdischargeisanindicationthattheinternalseatingpartsandsurfacesmay
requirethecleaning.
•Maybeinstalledhorizontallyorvertically.
•Quickclosingvalves,waterhammerorsupplypressurefluctuationscancauseinter-
mittentdischarge.TheinstallationofaWaterHammerArrestors(WattsSeries05)or
WaterPressureRegulator(WattsSeries1156or25AUB)mayberequiredtocorrect
theproblem.
• Important:Itisimportantnottoinstallwherethedischargecouldcausedamage.
Pipethedischargelineinaccordancewithlocalcoderequirements.Aphysicalairgap
mustbemaintainedbetween
thedischargepipeandthe
drainorsump.Createtheair
gapbycuttingthepipeona
45°bevel,atadistanceof
12"abovethefloor.Ifused
onboilerapplicationsdonot
useanairgapfittingatface
levelsoastopreventperson-
alinjuryfromscaldingwater
orsteam.Innoeventshould
theventopeningordrainline
beplugged.
•Iflocalcodesrequirethe
devicebetesteditmustbe
installedasshowninthedrawingonthereverseside.
RP/IS-9D
Limited Warranty: Watts Regulator Co. (the “Company”) warrants each product to be free from defects in material and
workmanship under normal usage for a period of one year from the date of original shipment. In the event of such defects
within the warranty period, the Company will, at its option, replace or recondition the product without charge.
THE WARRANTY SET FORTH HEREIN IS GIVEN EXPRESSLY AND IS THE ONLY WARRANTY GIVEN BY THE COMPANY
WITH RESPECT TO THE PRODUCT. THE COMPANY MAKES NO OTHER WARRANTIES, EXPRESS OR IMPLIED. THE
COMPANY HEREBY SPECIFICALLY DISCLAIMS ALL OTHER WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
The remedy described in the first paragraph of this warranty shall constitute the sole and exclusive remedy for breach
of warranty, and the Company shall not be responsible for any incidental, special or consequential damages, including
without limitation, lost profits or the cost of repairing or replacing other property which is damaged if this product does not
work properly, other costs resulting from labor charges, delays, vandalism, negligence, fouling caused by foreign material,
damage from adverse water conditions, chemical, or any other circumstances over which the Company has no control.
This warranty shall be invalidated by any abuse, misuse, misapplication, improper installation or improper maintenance or
alteration of the product.
Some States do not allow limitations on how long an implied warranty lasts, and some States do not allow the exclusion
or limitation of incidental or consequential damages. Therefore the above limitations may not apply to you. This Limited
Warranty gives you specific legal rights, and you may have other rights that vary from State to State. You should consult
applicable state laws to determine your rights. SO FAR AS IS CONSISTENT WITH APPLICABLE STATE LAW, ANY IMPLIED
WARRANTIES THAT MAY NOT BE DISCLAIMED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE, ARE LIMITED IN DURATION TO ONE YEAR FROM THE DATE OF ORIGINAL
SHIPMENT.
RP/IS-9D1209 EDP#1910237 ©2012Watts
USA: Tel. [phone] • Fax: [phone] • www.watts.com
Canada: Tel. [phone] • Fax: [phone] • www.wattscanada.ca
A Watts Water Technologies Company
9D Total Repair Kits
EDP NO. KIT NO. SIzE
0886010 RK 9DM2 T
1
⁄2",
3
⁄4" (15, 20mm)
0886011 RK 9DM3T
1
⁄2" (15mm)
Kit includes: primary & secondary checks, seat
and two union seals.
IMPORTANT:
Inquire with governing authoritiesfor
local installation requirements.
Tee
Tee
Tee
Watts
TC2
Watts
TC2
Watts
TC2
Watts Series
B6000 Shutoff
Valve No. 1
Test Cock No. 1
Test Cock No. 2
Test Cock No. 3
Watts Series
B6000 Shutoff
Valve No. 2
Boiler Installation
Watts 9DM3 Heating System Installation
Supply
Boiler
Return
Vent
Drain
Floor Drain
Integral
Strainer
Watts Model 1156F Feed
Valve with Union
Watts
9DM3