Specification Sheet

ManualsBrandsWatts ManualsHeating Supplies3/4" 40XL-5 Lead Free T&P Relief Valve (150 psi)

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, LF240 features 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

⁄4" and 1".

LF40L with test lever and short thermostat for installation directly in

available tank tappings. Sizes

⁄4" and 1".

Series LFN240 has the same basic body construction and advanced

design features as the Series LF40 and are identical to the Series

LF40 except for discharge capacity and size of inlet and outlet con-

nections. For complete specifications (including specifications for the

Series LF40) see other side. Sizes 1", 1

⁄4", 1

⁄2" and 2".

Features

• Lead Free brass*

• Non-mechanical seat-to-disc alignment

• Thermostat is accurate and proven. Exclusively designed and

manufactured by Watts

• Tamper-resistant bonnet screws

• Series LF40 features a unique thermostat with a special

thermo-bonded coating

• Series LFN240X are standardly 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* brass 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 or LF240.

Pressure – Temperature

Temperature relief: 210°F (99°C)

Pressure range: 75 – 150psi (5.2 – 10.3 bar)

Standard setting: 75, 100, 125 and 150psi (5.2, 6.9, 8.6 and 10.3 bar)

Series LF40L and LF40XL

Series LFN240X

Series LF40, LF240

Automatic Re-seating T&P Relief Valves

Standards

ASME Rated, ANSI Z21.22, Design certified and listed by CSA,

National Board of B&PVI to Section IV of the ASME B&PV code

and meet current FHA requirements and ANSI Z21.22 in addition to

Military Spec. MIL-V-136-12D, Type I.

For Commercial Water Heater Applications

ES-LF40_LF240

LEAD FREE

Job Name

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Contractor

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Job Location

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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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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.

*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

Following installation, the valve lever MUST be operated

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

Summary of content (2 pages)

PAGE 1
ES-LF40_LF240 For Commercial Water Heater Applications Job Name –––––––––––––––––––––––––––––––––––––––––––– Contractor ––––––––––––––––––––––––––––––––––––––––––––– Job Location –––––––––––––––––––––––––––––––––––––––––– Approval –––––––––––––––––––––––––––––––––––––––––––––– Engineer –––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No.
PAGE 2
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 thermostat. Vertical discharge line must be installed with its direction downward. Max. 6" (152mm) General Recommendations† For gas, electric or oil-fired storage water heaters between 180,000 to 205,000 BTU/Hr. rating: Use 3⁄4" Series LF40 tested under ANSI Z21.22 with ratings as certified and listed by CSA.