Watts N36 User Manual
For Water Heater/Tank Applications
ES-N36
Job Name
Job Location
Engineer
Approval
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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
Contractor
Approval
Contractor’s P.O. No.
Representative
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N36-M1
Tested and rated under “ANSI Z21.22
Relief Valves for Hot Water Supply Systems”.
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Design certied by
• 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.
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
Cold
Tank
Hot
T&P
Relief
Valve
Figure 1
Domestic Hot Water Supply Tanks and Heaters with
Top Supply
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 without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
Cover - Polypropylene
Dimensions-Weights Materials
A
Body - Brass
Components
Disc - Silicone
O-ring - Buna-N
Spring - 302
Stainless Steel
Float - Glass Filled
Polysulfone
Pressure/Temperature
Maximum steam working pressure: 15 psi (1.03 bars)
Maximum temperature: 250°F (121°C)
Typical Installations
Water Service Steam Service
N36-M1
Hot
Zone
Control
Valves
Cold
T&P
Relief
Valve
Tank
N36-M1
B
SIZE (DN) DIMENSIONS WEIGHT
A B
in. mm in. mm in. mm oz. gr.
1
⁄2 15 2 50 2 50 4 113
3
⁄4 20 2 50 2 50 4 113
Capacity
SIZE (DN) VENTING CAPACITY
in. mm MODEL CFM LPM
1
⁄2 15 N36-M1 15 425
3
⁄4 20 N36-M1 15 425
Pigtail*
Air Vents
No. N36 should
be installed on
supply main on
system side of
control zone valve
Steam
N36-M1
Pigtail*
Jacketed
Kettle
Trap
Trap
Figure 4
Low Pressure Steam Heating Systems
Figure 5
Jacketed Kettles
Figure 2
Domestic Hot Water Supply Tanks
and Heaters with Bottom Feed
N36-M1
T&P Relief
Valve
▼
Cold
N36-M1
Steam
Pigtail* not
needed for
pressure
under 5 lbs.
Trap
Figure 6
Temperature
Regulator
N36-M1
Unit Heaters
Figure 3 -
Table Top Heaters
Water Safety & Flow Control Products
ES-N36 0019-1 © Watts, 1997
*Note: When used for steam service, be sure to use pigtail to prevent live steam from damaging N36 valve.
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
Alternate
Installation
Pigtail*
Heating Coil
Steam Trap
Figure 7
Steam Coil Heaters
T&P Relief
Valve
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