Watts N241X - Manual

For Commercial Water Heater Applications
ES-40,140,240,340
Job Name ––––––––––––––––––––––––––––––––––––––––––– Contractor ––––––––––––––––––––––––––––––––––––––––––––
Job Location ––––––––––––––––––––––––––––––––––––––––– Approval –––––––––––––––––––––––––––––––––––––––––––––
Engineer ––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No. ––––––––––––––––––––––––––––––––––
Approval ––––––––––––––––––––––––––––––––––––––––––––– Representative ––––––––––––––––––––––––––––––––––––––––
IMPORTANT: INQUIRE WITH GOVERNING AUTHORITIES
FOR LOCAL INSTALLATION REQUIREMENTS
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 domestic
hot water supply tanks and heaters based on the latest ANSI Z21.22
Listing requirements for temperature discharge capacity.
40XL 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" (20 – 25mm).
40L with test lever and short thermostat for installation directly in avail-
able tank tappings. Sizes
3 ⁄
4
" and 1" (20 – 25mm).
Series 140, N240 and 340 have the same basic body construction and
advanced design features as the Series 40 and are identical to the Series
40 except for discharge capacity and size of inlet and outlet connections.
For complete specifications (including specifications for the Series 40)
see other side. Sizes 1", 1
1 ⁄
4
", 1 1 ⁄
2
" and 2" (25, 32, 40 and 50mm).
Features
• Bronze body construction
• Non-mechanical seat-to-disc alignment
• Thermostat is accurate and proven. Exclusively designed and
manufactured by Watts
• Tamper-resistant bonnet screws
• Series 40 and 140 feature a unique thermostat with a special
thermo-bonded coating
• Series 140 sizes 1" (25mm) and above 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 exces-
sive 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 T&P valve shall be a
Watts Regulator Company Series 40, 140, 240 or 340.
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.
Following installation, the valve lever MUST be operated AT LEAST
ONCE A YEAR by the water heater owner to ensure that the water-
ways 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.
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 40L and 40XL
Series 140X
Series N240X Series 340
Series 40, 140, 240 & 340
Automatic Re-seating T&P Relief Valves
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.