Watts LFN36 - Manual

For Water Heater/Tank Applications
ES-LFN36
Job Name ––––––––––––––––––––––––––––––––––––––––––– Contractor ––––––––––––––––––––––––––––––––––––––––––––
Job Location ––––––––––––––––––––––––––––––––––––––––– Approval –––––––––––––––––––––––––––––––––––––––––––––
Engineer ––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No. ––––––––––––––––––––––––––––––––––
Approval ––––––––––––––––––––––––––––––––––––––––––––– Representative ––––––––––––––––––––––––––––––––––––––––
Model LFN36-M1
Vacuum Relief Valve
Sizes: 1 ⁄
2
" – 3 ⁄
4
" (15 and 20mm) Male NPT
Features
• Low profile
• All Lead Free* brass body
• Protective cap
• Suitable for low pressure steam and water service
• Tested and rated to ANSI Z21.22
• CSA certified
• The LFN36-M1 features Lead Free* construction to comply
with Lead Free* installation requirements.
Applications
• Domestic water heaters and supply tanks
• Table top heaters
• Jacketed steam kettles
• Unit heaters
• Low pressure steam systems
• Steam coil heaters
Note: Vacuum relief valves are not designed or approved as
backsiphonage backflow preventers. For protection against
backsiphonage install Watts Series 288A vacuum breakers.
Standards
Tested and rated to ANSI Z21.22
CSA certified
Specifications
A Watts Model LFN36-M1 Vacuum Relief Valve shall be installed
on domestic hot water supply tanks/ heaters/ unit heaters/
steam kettles as indicated on plans. The vacuum relief valve
shall be ANSI Z21.22 rated and CSA certified. The vacuum relief
valve shall have an all brass body and include a protective cap
for automatic venting of a closed system to atmosphere when
a vacuum is created. The Lead Free* Vacuum Relief Valve shall
comply with state codes and standards, where applicable,
requiring reduced lead content. The Watts LFN36-M1 Vacuum
Relief Valve permits air to enter and prevent vacuum condi-
tions that could siphon the water from the system, resulting in
collapse of a tank or water heater or equipment burn out. The
valve shall be a Watts Model LFN36-M1.
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.
LFN36-M1
Tested and rated under “ANSI Z21.22
Relief Valves for Hot Water Supply Systems”.
Design certified by
LFN36-M1
T&P
Relief
Valve
Hot
Cold
Tank
Figure 1
Domestic Hot Water Supply Tanks and Heaters with
Top Supply
LEAD FREE
*
* The wetted surface of this product contacted by consumable water
contains less than one quarter of one percent (0.25%) of lead by
weight.