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TechnicalInstructions  LMVSeries

DocumentNo.LV5‐1000

Section7 Page10 SCCInc.

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OpenSafetyLoop–ErrorCode21

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Thesafetyloopismeantonly for safety limitssuchas an auxiliary lowwatercutoutorahigh

limit.Thesafetyloopmustbecomplete,andcannotbereconfigured.Thewiringofthesafety

loopisshownbelow:

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Ifanerrorcode21isencountered,checkthefollowing:

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1. TheburnerflangeswitchwiredbetweenterminalsX3‐03.1andX3‐03.2.Thereshouldbe

120VAConterminalX3‐03.1atalltimes.Ifaburnerflangeswitchisnotpresent,ajumper

mustbeplacedbetweenterminalsX3‐03.1andX3‐03.2.

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2. Operatingswitchesinthesafetyloop.Operating(cycling)switchesshouldnotbewired

intothesafetyloop.Ifacyclingswitchisplacedinthisloopanditcyclesoff,theLMV5will

lockout.Thecyclingswitchshouldberelocatedinserieswiththeburneron/offswitch

wiredtoX5‐03.1:

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 IftheLMV5isinanyexternalloadcontrollermode(ExtLC…),thisisusedtocyclethe

burneronandoff.

 IftheLMV5isinanyinternalloadcontrollermode(IntLC…),thenacyclingswitch

maynotbenecessary,sincethisisdoneautomaticallyintheLMV5usingparameters

SD_ModOnandSD_ModOff.

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3. ThesafetyloopbetweenterminalsX3‐04.1andX3‐04.2

.Thereshouldbe120VACon

terminalX3‐04.1atalltimes.Ifthereisnot,thenoneormoreofthedeviceswiredintothe

safetyloopareopen.Checkeachdevicewiredintothesafetylooptofindwhichoneis

open.

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