Install Instructions

Tee
Tee
Tee
Watts
TC2
Watts
TC2
Watts
TC2
Series 9DM2, 9DM3
Dual Check with Atmospheric Vent
Sizes:
1
⁄2",
3
⁄4" (15, 20mm)
Note: Model 9DS - Remove union connections before sweating
• The 9D Dual Check with Atmospheric Vent is designed for use on non-health
hazard, continuous pressure, point of use applications for protection against
backsiphonage and backpressure. Install in accordance with the local codes.
• Remove union connections before sweating.
• For the best system performance, install on the fresh water feed line before
any pressure 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
intermittent 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.
• 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 personal injury from scalding water or steam.
• If local codes require the device be tested it must be installed as shown in the
drawing on the reverse side.
Supply
Integral Strainer
Watts 1156
Vent
Drain
Re-
turn
Floor Drain
Boiler
Watts 9D
▼
▼
Model 9D Heating System Installation
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.
RP/IS-9D
Field Testing Procedure
Series 9D 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
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
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.
RP/IS-9D 0829 EDP# 1910237 © Watts, 2008
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
Water Safety & Flow Control Products
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.