Submittal Sheet

Sizing and Placement
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.
X
Up to 20 ft. (6m)
Y
X
Over 20 ft. (6m)
Rule 1
Rule 2
Riser
Typical Branch Line
No. LF15M2/LF15M2S
Water Hammer Arrestor
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.
Sizing and Selection Table
Fixture Units Sizing Information
Dimensions - Weight
SIZE
(DN)
MODEL
ORDER
CODE
MODEL
ORDER
CODE
CROSS
FIXTURE
UNITS
REF. PDI
STANDARD
in. mm Threaded Solder
1
⁄2" 15 LF15M2-A 0750160 LF15M2-AS 0750150 1-11 A
3
⁄4" 20 LF15M2-B 0750161 LF15M2-BS 0750151 12-32 B
1" 25 LF15M2-C 0750162
LF15M2-CS 0750152 33-60 C
1" 25 LF15M2-D 0750163
LF15M2-DS 0750153 61-113 D
1" 25 LF15M2-E 0750164
LF15M2-ES 0750154 114-154 E
1" 25 LF15M2-F 0750165
LF15M2-FS 0750155 155-330 F
SIZE (DN) BDIMENSIONS WEIGHT
A B
in. mm in. mm (lbs) (kgs)
Threaded
1
⁄2" LF15M2-A 1
1
⁄8 28.5 5
15
⁄16 150.9 0.5 0.2
3
⁄4" LF15M2-B 1
3
⁄8 34.9 8
9
⁄16 218.0 0.9 0.4
1" LF15M2-C 1
5
⁄8 41.3 8
13
⁄16 223.5 1.3 0.6
1" LF15M2-D 2
1
⁄8 54.0 9
15
⁄16 252.5 2.0 0.9
1" LF15M2-E 2
1
⁄8 54.0 12
11
⁄16 322.5 2.3 1.1
1" LF15M2-F 2
5
⁄8 66.7 11
5
⁄32 283.5 2.7 1.2
Solder
1
⁄2" LF15M2-AS 1
1
⁄8 28.5 8
1
⁄4 210.0 0.44 0.2
3
⁄4" LF15M2-BS 1
1
⁄8 28.5 10 254.0 0.54 0.2
1" LF15M2-CS 1
3
⁄8 34.9 12
1
⁄2 317.5 0.92 0.4
1" LF15M2-DS 2
1
⁄8 54.0 11 280.0 1.63 0.7
1" LF15M2-ES 2
1
⁄8 54.0 13
1
⁄2 343.0 1.98 0.9
1" LF15M2-FS 2
1
⁄8 54.0 16 406.5 2.32 1.1
B
A
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
1
/2 1
1
/2 1 1 1
Bathtub Faucet 4 2 3 2 1
1
/2 1
1
/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
ES-LF15M21213  ©2012Watts
USA:Tel:(978)688-1811•Fax:(978)794-1848•www.watts.com
Canada: Tel:(905)332-4090•Fax:(905)332-7068•www.wattscanada.ca
A Watts Water Technologies Company
NOTE: The information contained herein is not intended to
replace the full product installation and safety information
available or the experience of a trained product installer. You
are required to thoroughly read all installation instructions and
product safety information before beginning the installation of
this product.