Watts N36 - Manual

For Water Heater/Tank Applications
ES-N36
Job Name ––––––––––––––––––––––––––––––––––––––––––– Contractor ––––––––––––––––––––––––––––––––––––––––––––
Job Location ––––––––––––––––––––––––––––––––––––––––– Approval –––––––––––––––––––––––––––––––––––––––––––––
Engineer ––––––––––––––––––––––––––––––––––––––––––––– Contractor’s P.O. No. ––––––––––––––––––––––––––––––––––
Approval ––––––––––––––––––––––––––––––––––––––––––––– Representative ––––––––––––––––––––––––––––––––––––––––
Model N36-M1
Vacuum Relief Valve
Sizes: 1 ⁄
2
" – 3 ⁄
4
" (15 and 20mm) Male NPT
Features
• Low profile
• All brass body
• Protective cap
• Suitable for low pressure steam and water service
• Tested and rated to ANSI Z21.22
• CSA certified
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
back-siphonage backflow preventers. For protection against
back-siphonage install Watts Series 288A vacuum breakers.
Standards
Tested and rated to ANSI Z21.22
CSA certified
Specifications
A Watts Model N36-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.
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.
N36-M1
Tested and rated under “ANSI Z21.22
Relief Valves for Hot Water Supply Systems”.
Design certified by
For automatic venting of a closed system to atmosphere when
a vacuum is created. The Watts N36-M1 Vacuum Relief Valve
permits air to enter and prevent vacuum conditions that could
siphon the water from the system, resulting in collapse of a
tank or water heater or equipment burn out.
N36-M1
T&P
Relief
Valve
Hot
Cold
Tank
Figure 1
Domestic Hot Water Supply Tanks and Heaters with
Top Supply