Specification Sheet

Series LFN240X
Series LF140
Series LF40L
and LF40XL
For Commercial Water Heater Applications
ES-LF40_LF140_LFN240_LF340
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Approval
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Engineer
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Contractor’s P.O. No.
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Approval
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Representative
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The combined 2-in-1 Temperature & Pressure Relief Valve provides
the least expensive and proven means for protection against both
excessive temperature and pressure emergency conditions.
Fully automatic temperature and pressure relief protection for domes-
tic hot water supply tanks and heaters based on the latest ANSI
Z21.22 Listing requirements for temperature discharge capacity. The
LF40, LF140, LFN240, and LF340 feature Lead Free* construction to
comply with Lead Free* installation requirements.
LF40XL with test lever and extension thermostat for installation in hot
water outlet within the allowable distance from the top of the tank
based on latest ANSI Z21.22. Sizes
3
⁄4" and 1".
LF40L with test lever and short thermostat for installation directly in
available tank tappings. Sizes
3
⁄4" and 1".
Series LF140, LFN240 and LF340 have the same basic body con-
struction and advanced design features as the Series LF40 except
for discharge capacity and size of inlet and outlet connections. For
complete specifications (including specifications for the Series LF40)
see other side. Sizes 1", 1
1
⁄4", 1
1
⁄2" and 2".
Features
• Lead Free cast body
• Non-mechanical seat-to-disc alignment
• Tamper-resistant bonnet screws
• Series
3
⁄4" LF40, LF140 and 1" LF40 feature a unique thermostat
with a special thermo-bonded coating
• Series 1" LF140 are furnished with stainless steel thermostat tube
• Series LFN240, LF340 and LF342 are furnished with stainless steel
thermostat tube
Specifications
Temperature & Pressure Relief Valves
Each hot water storage heater shall be equipped with an automatic
temperature and pressure relief valve to protect the heater from
excessive pressure and excessive temperature. The device shall be
certified as meeting the requirements of ASME low pressure heating
boiler code and ANSI Z21.22. The BTU discharge capacity of the
device shall be in excess of the BTU input rating of the heater. The
device shall be constructed using Lead Free* materials. Lead Free*
automatic re-seating T&P relief valves shall comply with state codes
and standards, where applicable, requiring reduced lead content. The
T&P valve shall be a Watts Series LF40, LF140, LFN240 or LF340.
Series LF40, LF140,
LFN240, and LF340
Automatic Re-seating
T&P Relief Valves
LEAD FREE
*
Series LF340
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 with-
out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
Following installation, the valve lever MUST be oper-
ated AT LEAST ONCE A YEAR by the water heater
owner to ensure that the waterways are clear. Certain
naturally occurring mineral deposits may adhere to the
valve, blocking waterways, rendering it inoperative.
When the lever is operated, Hot water will discharge if
the waterways are clear. Precautions must be taken to
avoid personal injury from contact with hot water and to
avoid property damage.
WARNING
!
*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.
NOTICE
Inquire with governing authorities for local installation requirements
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 begin-
ning the installation of this product.
NOTICE