Watts 15M2 User Manual
For Commercial Applications
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Series 15M2
Water Hammer Arrestors
Sizes: 1⁄2" - 1" (15-25mm)
What is Water Hammer?
The noise from banging pipes is caused by shocks of high speed
water flowing in the piping system when a fixture is suddenly
closed. Sudden stoppage of the water (a non-compressible
liquid) flowing at a given pressure and velocity causes a surge or
spike of pressure and is called water hammer. When this occurs,
a pressure wave travels back through the piping until it finds a
point of relief.
Dishwashers, clothes washers, fast closing positive shutoff valves
incorporated in the system all contribute to creating water shock
which is not only annoying but damaging to pipes and appliances. The Watts Series 15M2 incorporates a pre-charged,
permanent sealed air chamber to absorb the shock. The sealed
chamber prevents the loss of air to the water and insures long
and trouble-free life.
15M2
ES-15M2
Features
• NPT solid hex brass adapter or solder end connection
for easy installation
• Approved for installation with no access panel required
• May be installed in new or existing plumbing systems with a
standard pipe tee vertically, horizontally or at any angle
• PDI Listed (PDI WH201)
• Maintenance free – piston is the only moving part
• Air pre-load is 60psi (4.2 bar)
• Factory air charged and permanently sealed
Standards
Standard: Listed by IAPMO, ASSE 1010 approved, ANSI
A112.26.1M approved, PDI WH201 approved and certified.
Pressure - Temperature
Operating Pressure: Designed to operate on all domestic and
commercial lines @ 150psi (10.6 bar) working pressure.
Temperature Range: 33°F to 180°F (0.5°C to 82°C).
Materials
Body: Copper tubing
Piston: Polypropylene
Adapter: Brass
O-ring: EPDM
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
Sizing and Placement
No. 15M2
Water Hammer Arrestor
Riser
Typical Branch Line
Rule 1
Rule 2
Up to 20 ft. (6m)
Over 20 ft. (6m)
Y
X
X
As shown, it has been established that the preferred location
for the water hammer arrestor is at the end of the branch line
between the last two fixtures served.
The location of the water hammer arrestor shown above applies
to branch lines that do not exceed 20 ft. (6m) in length, from the
start of the horizontal branch line to the last fixture supply on
this branch line. When the branch line exceeds the 20 ft. (6m)
length, an additional water hammer arrestor should be used.
This practice is best defined by two rules which have been
established to cover the placement of water hammer arrestors.
Dimensions - Weight
B
A
SIZE (DN) DIMENSIONS WEIGHT
A B
in. mm in. mm (lbs) (kgs)
Threaded
1
⁄2" 15M2-A 11⁄8 28.5 515⁄16 150.9 0.5 0.2
3
⁄4" 15M2-B 13⁄8 34.9 89⁄16 218.0 0.9 0.4
1" 15M2-C 1
1" 15M2-D 2
1" 15M2-E 2
1" 15M2-F 2
5
⁄8 41.3 813⁄16 223.5 1.3 0.6
1
⁄8 54.0 915⁄16 252.5 2.0 0.9
1
⁄8 54.0 1211⁄16 322.5 2.3 1.1
5
⁄8 66.7 115⁄32 283.5 2.7 1.2
Rule 1 covers multiple fixture branch lines which do not
exceed 20 ft. (6m) in length.
Explanation - Fixture-unit sizing and selection table is used
to select the required PDI unit (water hammer arrestor).
Rule 2 covers multiple fixture branch lines which do exceed
20 ft. (6m) in length.
Explanation - Fixture-unit sizing and selection table is used
to select the required PDI unit (water hammer arrestor). The
sum of the fixture units rating of units X and Y shall be equal
to or greater than the demand of the branches.
Sizing and Selection Table
SIZE (DN) MODEL ORDER CODE
in. mm Threaded
1
⁄2" 15 15M2-A 0750140 1-11 A
3
⁄4" 20 15M2-B 0750141 12-32 B
1" 25 15M2-C 0750142 33-60 C
1" 25 15M2-D 0750143 61-113 D
1" 25 15M2-E 0750144 114-154 E
1" 25 15M2-F 0750145 155-330 F
CROSS FIXTURE
UNITS
REF. PDI
STANDARD
Fixture Units Sizing Information
FIXTURE UNITS
TYPE OF SUPPLY PUBLIC PRIVATE
FIXTURE CONTROL TOTAL C.W. H.W. TOTAL C.W. H.W.
Water Closet 1.66 PF Flush Valve 8 8 – 5 5 –
Water Closet 1.66 PF Flush Tank 5 5 – 2.5 2.5 –
Pedestal Urinal 1.06 PF Flush Valve 4 4 – – – –
Stall or Wall Urinal Flush Valve 1.06 PF 4 4 – – – –
Stall or Wall Urinal Flush Tank 1.06 PF 2 2 – – – –
Lavatory Faucet 2 1
Bathtub Faucet 4 2 3 2 1
1
/2 11/2 1 1 1
1
/2 11/2
Shower Head Mixing Valve 4 2 3 2 1 2
Bathroom Group Flush Valve Closet – – – 8 8 3
Bathroom Group Flush Tank Closet – – – 6 6 3
Separate Shower Mixing Valve – – – 2 1 2
Service Sink Faucet 3 3 3 – – –
Laundry Tubs (1-3) Faucet – – – 3 3 3
Combination Fixture Faucet – – – 3 3 3
A Watts Water Technologies Company
ES-15M2 1103 © 2011 Watts
USA: No. Andover, MA • Tel. (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Burlington, ONT. • Tel. (905) 332-4090 • Fax: (905) 332-7068 • www.wattscanada.ca
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