INSTRUCTION SHEETL4188/L6188A, B, C AND L4191/L6191A, BAQUASTAT CONTROLMU1R--9023 9906R11--NEL4191/L6191L4188/L6188APPLICATIONThe L4188/L6188 and L4191/L6191 aquastat thermostats aresensitive direct immersion type water temperaturethermostats for limiting and controlling boiler watertemperature in hydronic heating systems.The L4188/L6188 aquastat thermostats are single aquastats.The L4191/L6191 aquastat thermostats are dual aquastatsi.e. two independent controls (controller and limiter housedunder a single cover).The L4188/L6188 and L4191/L6191 aquastat thermostatsconfirm with the following EC directives:Low Voltage Directive 73/23/EECElectro Magnetic Compatability Directive 89/336/EECCompliance with the EMC directive regarding emissioncan only be determined in the application.SPECIFICATIONSModelSee table 1. page 2DimensionsL4188/L6188: fig. 3. page 16L4191/L6191: fig. 4. page 16Ambient temperature0 ... 70ECCapillary length0.22 m, 1 m, or 1.5 mElectrical connection6.3 mm quick connect terminals suitable for 1/ 4” receptacles.The L6188 and L6191 series thermostats are provided withadapters for screw connectionElectrical rating10 A at 250 Vac, resistive load2.5 A at 250 Vac, inductive load15 A at 250 Vac, locked rotor2 A at 24 Vac, inductive load250 mA at 30 mVdc (special option)Terminal data (see fig. 1. and 2. )C--1 breaks on temperature rise (SPST and SPDT)C--2 makes on temperature rise (SPDT only)Immersion wells (must be ordered separately for bulk pack aquastats)Type Insertionlength (mm)Thread** Order number105 1/2” BSPT 45.900.409--003Single 105 1/4” BSPT 45.900.409--004Single265 1/2” BSPT 45.900.409--005169 1/2” BSPT 45.900.409--006Dual 105 1/2” BSPT 45.900.409--007** Insertion length including thread of brass spudMaximum well pressure: 10 bar for single and multi wells(ND 10)ContentsEnglish 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Deutsch 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Nederlands 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Italiano 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Français 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Sverige 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Suomi 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Subject to change without notice. Printed in the Netherlands.