Watts LF210-5 User Manual

For Gas Water Heater Applications

ES-LF210-5

Job Name

Job Location

Engineer

Approval

LEAD FREE

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Series LF210-5

Automatic Gas Shutoff Valves

Series LF210-5 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 LF210-5 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. The LF210-5 features Lead Free* construction to comply with Lead Free* installation requirements.

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 LFL210-5 M2, LFLL210-5 M2 and LFLLL210-5 M2 feature extended shanks for use with the new generation of water heaters containing extra thick insulation.

Contractor

Approval

Contractor’s P.O. No.

Representative

LF210-5 M2

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Reset Button

Thermostat

LFL210-5 M2

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.

LFLL210-5 M2

Models

LF210-5 M2 Suitable for water heaters with up to 3⁄4" of insulation LFL210-5 M2 Suitable for water heaters with up to 2" of insulation LFLL210-5 M2 Suitable for water heaters with up to 2 LFLLL210-5 M2 Suitable for water heaters with up to 3" of insulation

⁄2" of insulation

Specifications

Standard setting: 210°F (99°C) Extension: Furnished with 5" thermostat extension only.

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.

NOTICE

Inquire with Governing Authorities for Local Installation Requirements

*The wetted surface of this product contacted by consumable water contains less than 0.25% of lead by weight.

LFLLL210-5 M2

Typical Installations

WARNING

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.

WARNING

The installation of a separate pressure relief valve is required for installations without T&P. Removal of the factory installed T&P valve may void water heater manufacturer’s warranty.

Fig. 1

Water Heaters equipped with T&P valve

Gas From

Supply

Series

Cold

LF210-5

Gas To Burner

Hot

T&P Relief Valve

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.

NOTICE

See C.S.A. directory for adjustment factors when used with manufactured, mixed and L.P. gas-air mixtures.

Dimensions — Weights

Water Heaters without factory installed T&P *

Pressure Relief Valve

Pressure Relief Valve Alternate Installation

Cold

Drain Tube

Fig. 2

Water Heaters without factory installed T&P alternate *

Hot

Fig. 3

Drain Tube

To Bottom Supply

Pressure Relief Valve

Cold

Pressure Relief Valve Alternate

Installation

Gas From

Supply

Hot

Drain Tube

Series LF210-5

Gas To Burner

Gas From

Supply

Series

LF210-5

Gas To Burner

MODEL DIMENSIONS WEIGHT

A B C D

in. mm in. mm in. mm in mm lbs kgs.

LF210-5 M2 21⁄2 64 11⁄8 29 8 203 7/8 22 1.0 0.45 LFL210-5 M2 2 LFLL210-5 M2 2 LFLLL210-5 M2 2

MODELS

LF210-5 M2, LFL210-5 M2, LFLL210-5 M2, LFLLL210-5 M2

A Watts Water Technologies Company

⁄2 64 11⁄8 29 713/16 198 17/8 48 1.0 0.45

⁄2 64 11⁄8 29 85/16 211 23/8 60 1.0 0.45

⁄2 64 11⁄8 29 813/16 224 27/8 73 1.0 0.45

CONNECTIONS

TANK GAS NATURAL GAS L.P. GAS

⁄4" male

⁄2" female 150,000 243,000 77,400 125,750

USA: Tel: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com

Canada: Tel: (905) 332-4090 • Fax: (905) 332-7068 • www.watts.ca

BTU/HR RATINGS M.F.G. AND

L.P. GAS AIR MIXTURES MIXED GASES