Burnham RSA manual Low Water Cut Off Lwco, Lwco Location, Wiring of Typical Lwco

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X. Low Water Cut Off (LWCO)

WARNING

DO NOT ATTEMPT to cut factory wires to install an aftermarket Low Water Cut Off (LWCO). Only use connections specifically identified for Low Water Cut Off.

In all cases, follow the Low Water Cut Off (LWCO) manufacturer's instructions.

When

A low water cutoff is required to protect a hot water boiler when any connected heat distributor (radiation) is installed below the top of the hot water boiler (i.e. baseboard on the same floor level as the boiler). In addition, some jurisdictions require the use of a LWCO with a hot water boiler.

Where

The universal location for a LWCO on both gas and oil hot water boilers is above the boiler, in either the supply or return piping. The minimum safe water level of a water boiler is at the uppermost top of the boiler; that is, it must be full of water to operate safely.

What Kind

Typically, in residential applications, a probe type LWCO is used instead of a float type, due to their relative costs and the simplicity of piping for a probe LWCO.

How to Pipe

A “tee” is commonly used to connect the probe LWCO to the supply or return piping, as shown below.

LWCO Location

Select the appropriate size tee using the LWCO manufacturer’s instructions. Often, the branch connection must have a minimum diameter to prevent bridging between the probe and the tee. Also, the run of the tee must have a minimum diameter to prevent the end of the probe from touching or being located too close to the inside wall of the run of the tee.

Ideally, manual shutoff valves should be located above the LWCO and the boiler to allow for servicing. This will allow probe removal for inspection without

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draining the heating system. Many probe LWCO manufacturers recommend an annual inspection of the probe.

How to Wire

LWCO’s are available in either 120 VAC or 24 VAC configurations. The 120 VAC configuration can be universally applied to both gas and oil boilers by wiring it in the line voltage service to the boiler (after the service switch, if so equipped).

The presence of water in a properly installed LWCO will cause the normally open contact of the LWCO to close, thus providing continuity of the 120 VAC service to the boiler.

It is recommended to supply power to the probe LWCO with the same line voltage boiler service as shown below.

Wiring of Typical LWCO

A 24 VAC LWCO is used primarily for gas fired boilers where a 24 volt control circuit exists within the boiler. However, a 24 VAC LWCO can only be used if the boiler manufacturer has provided piping and wiring connections and instructions to allow for this application.

How to Test

Shut off fuel supply. Lower water level until water level is BELOW the LWCO. Generate a boiler demand by turning up thermostat. Boiler should not attempt to operate. Increase the water level by filling the system. The boiler should attempt to operate once the water level is above the LWCO.

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Contents RSA Series 8143508R21-1/10 Price $3.00Important Information Read Carefully Page Page Table of Contents RSA Packaged Boiler RSA170 / RSA285 Pre-Installation Do not drop boiler. Do not bump boiler jacket against floorPage Removal of Boiler II. Knock-Down Boiler AssemblyInstalling the Jacket Installation of Boiler Controls Burner MountingThis page is Left Intentionally Blank III. Water Piping and Trim Page Page Page Page Schematic Tankless Heater Piping Tankless Heater Ratings IV. Venting Recommended Smoke Pipe Arrangement and Chimney Requirements Electrical GeneralRsal Wiring Less Tankless, Single Circulator Circulator Zoned Wiring for Honeywell R8888 Zone Valve Zoned Wiring for R8889 Page Page Circulator Zoning with EC5000 Wiring Schematic SchematicWiring EC5000with ZonedValve Zone19 Single-Pipe Installation VI. Oil PipingSingle-Stage Units 3450 RPM Two Pipe Systems Two-Stage Units 3450 RPM Two Pipe SystemsVII. System Start-Up Operation LED Error CodesDisplay Readout High Limit ControllerLOW Limit and Circulator Controller Trouble Shooting GuideL7224 / L7248 Controller Operating Sequence Carlin EZ-2HP Burner Beckett AFG, AF, & SF BurnersBecket AFG Burner Beckett Burner Carlin EZ-1HP BurnerAdjust OIL Pressure Remove GUN AssemblyVerify OIL Burner Settings Before Starting Other AdjustmentsHigh Altitude Installations Hints on CombustionTest Controls Verify High Limit OperationUse Part Number 6183505 for the following models VIII. Service and Cleaning Clean the FiretubesAvoid Breathing Fiber Particulates and Dust IX. Repair Parts Description Part Number Fogire 28 Assembled BoilerRSA85-135 Bare Boiler Repair Parts ‘A’ RSA170-285 Boiler Repair Parts Jacket Top Panel Assembly Beckett Burner Parts List for RSA Series Steel Boilers Ordering Information for Quality Replacement Parts AF60XO AF60XP SF60FY Beckett AF and SF Model Burners Lwco Location Wiring of Typical LwcoLow Water Cut Off Lwco Service Record Limited Warranty

RSA specifications

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