Submittal Sheet

Series LF100XL
Direct Side Tapping
For External Flue Heaters
Use extra length extension thermostat
to extend into water storage tank.
For Internal Flue Heaters
Use short or standard length thermo-
stat. Vertical discharge line must be
installed with its direction downward.
Direct Top Tapping
For Heaters
Use standard or extra length
extension thermostat.
Alternate
Only when the tappings are
not provided
Use standard or extra length
extension thermostat.
Dimensions – Weights
MODEL SIZE DIMENSIONS WEIGHT CSA
0 Ordering A B D T 0 Temp. Steam
0 Code* in. in. mm in. mm in. mm in. mm oz. gm Rating BTU/hr.
LF100XL 150/210 0556000
3
⁄4 1
5
⁄32 40 3
11
⁄64 81 1
3
⁄16 30 4 100 8 227 105,000
LF100XL8 150/210 0556001
3
⁄4 1
5
⁄32 40 3
11
⁄64 81 1
3
⁄16 30 8 203 8 227 105,000
A = overall width of the valve.
B = overall height of the valve, with lever closed, not including thermostat element length.
D = length of shank , from shoulder under outlet orifice overhang to inlet orifice edge.
T = length of thermostat element, measured from inlet orifice edge to end of thermostat.
* 150psi set pressure
T
B
A
D
ES-LF100XL 1429 © 2014 Watts
USA: T: [phone] • F: [phone] • Watts.com
Canada: T: [phone] • F: [phone] • Watts.ca
Latin America: T: (52) 81-1001-8600 • Watts.com
REINSPECTION OF VALVES: Relief valves should be
inspected AT LEAST ONCE EVERY THREE YEARS, and
replaced, if necessary, by a licensed plumbing contractor or quali-
fied service technician to ensure the product has not been affected
by corrosive water conditions and to ensure that the valve and
discharge line have not been altered or tampered with illegally.
The valve and its components must be physically removed and
inspected to ensure naturally occurring mineral deposits have
not adhered to the valve, rendering it inoperative. FAILURE TO
REINSPECT THE VALVE AS DIRECTED COULD RESULT IN
UNSAFE CONDITIONS WHICH CAN RESULT IN SERIOUS
INJURY, DEATH, AND/OR PROPERTY DAMAGE.
IMPORTANT: A relief valve functions in an emergency by dis-
charging water. It is essential that a discharge line be piped from
the valve in order to carry the overflow to a safe place of disposal.
The discharge line must be of the same size as the valve discharge
connection throughout its entire length and pitch downward from
the valve terminating at least 6" (152mm) above a drain where any
discharge will be clearly visible. For a proper discharge line consult
your Watts Representative.
WARNING
!