Watts 210-5 User Manual
Series 210-5
Automatic Gas Shutoff Valves
Series 210-5 automatic gas shutoff valves are positive-acting energy
shutoff for the emergency temperature protection of gas water heaters.
They are self-contained devices independent of all other operating controls. They provide protection against overheating water in the domestic
hot water supply heating systems by automatically shutting off the gas
supply to the heater in the event that the water temperature reaches
210°F (99°C). Series 210-5 must be manually reset in order to resume
heater service. This feature serves as a warning of malfunctioning of the
normal operating controls. Manual resetting is easily done and does not
require dismantling or replacing of any part of the valve. See “Reset
Button” feature.
This gas shutoff differs from other contemporary design in that Watts
engineers have embodied the time tested Watts auto-thermatic thermal
actuator principle along with a snap-acting trip latch which closes the
valve at a definite controlled temperature.
Models L210-5 M2, LL210-5 M2 and LLL210-5 M2 feature extended
shanks for use with the new generation of water heaters containing
extra thick insulation.
Features
• Seating - Buna N disc to metal seating assures positive seal for
shutting off the gas to burner in the event of high water temperature conditions.
• Reset Button - After operating from high temperature, the gas
shutoff must be manually reset (opened). Pressing the reset button in as far as it will go and then releasing, opens the valve and
allows gas to again flow to the burner.
• Trip Latch Assembly - Snap acting latch releases the valve to
closed at a definite controlled temperature. Stainless steel spring
seats valve when trip latch releases valve to closed position
• Thermostat - Operates trip latch in response to water temperature.
Thermobulb, temperature sensitive portion, is at end of extension
tube for accurate response to tank temperature.
Models
210-5 M2 Suitable for water heaters with up to 3/4" of insulation
L210-5 M2 Suitable for water heaters with up to 2" of insulation
LL210-5 M2 Suitable for water heaters with up to 2
1
/2" of insulation
LLL210-5 M2 Suitable for water heaters with up to 3" of insulation
Specifications
Standard setting: 210°F (99°C)
Extension: Furnished with 5" thermostat extension only.
For Gas Water Heater Applications
ES-210-5
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 without prior
notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
IMPORTANT: INQUIRE WITH GOVERNING AUTHORITIES
FOR LOCAL INSTALLATION REQUIREMENTS
210-5 M2
L210-5 M2
LL210-5 M2
LLL210-5 M2
Thermostat
Reset Button
ES-210-5 0531 © Watts Regulator Company, 2005
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.wattsreg.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
A
D
B
C
Dimensions — Weights
“Alternate” Only When The Tappings Are Not Provided
“Alternate” Only When The Tappings Are Not Provided
Fig. 2
Fig. 3
Typical Installations
Installation: The gas shutoff valve must be installed so that the thermostat is immersed in the water within the upper 6" of the tank DO
NOT INSTALL IN COLD WATER LINE.
Note: The installation of a separate pressure relief valve is necessary for
installations using gas shutoffs.
Pressure Relief
Valve Alternate
Installation
Gas From
Supply
Cold
Drain Tube
Hot
Drain Tube
Series
210-5
Gas To
Burner
Pressure Relief
Valve Alternate
Installation
Gas From
Supply
Cold
Drain Tube
Pressure Relief Valve
Hot
Drain Tube
Series
210-5
Gas To Burner
To Bottom Supply
Pressure Relief Valve
Pressure Relief Valve
Pressure Relief Valve
Alternate Installation
Direct side Tapping
Fig. 1
Gas From
Supply
Cold
Drain Tube
Hot
Drain Tube
Series 210-5
Gas To Burner
MODEL DIMENSIONS WEIGHT
AB C D
in. mm in. mm in. mm in mm lbs kgs.
210-5 M2 21⁄2 64 11⁄8 29 8 203
7
/8 22 1.0 0.45
L210-5 M2 21⁄2 64 11⁄8 29 713/16 198 17/8 48 1.0 0.45
LL210-5 M2 21⁄2 64 11⁄8 29 85/16 211 23/8 60 1.0 0.45
LLL210-5 M2 21⁄2 64 11⁄8 29 813/16 224 27/8 73 1.0 0.45
Models BTU/HR Ratings
Connections Natural L.P. M.F.G. and L.P.
Tank Gas Gas Gas Gas Air Mixtures Mixed Gases
210-5 M2, L210-5 M2, LL210-5 M2, LLL210-5 M2
3
⁄4" male
1
⁄2" female 150,000 243,000 77,400 125,750
Gas Capacity
C.S.A. listed ratings of this valve are:
For use with natural gas 150,000 BTU/hr.
For use with liquified petroleum gas 243,000 BTU/hr.
NOTE: See C.S.A. directory for adjustment factors when used
with manufactured, mixed and L.P. gas-air mixtures.
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