resideo Multiple Aquastat L4081A

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PRODUCT DATA

60-2105-07

L4081A,B and L6081A,C

Multiple Aquastat® Controllers

APPLICATION

The L4081 and L6081 Aquastat® Controllers provide boiler

water regulation in gas- or oil-fired hydronic heating

systems.

FEATURES

• An immersion type liquid-filled sensing element actuates

two snap switches.

• One switch operates as a high limit control.

• The other switch operates as a low limit and/or circulator

control, depending on the model.

• Controller may be mounted in any positioning and needs

no leveling.

• Separate, easy-to-read, calibrated dial and setpoint

adjustments for each switch.

• Differential adjustment on low limit or circulator switch.

• All adjustments accessible inside front cover.

• Push-in terminals for quick connecting.

• Single sensing element for easy installation.

• Two spst snap switches (one spst and one spdt in

L6081A,C) act independently at respective temperature

settings.

Main Page

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Summary

Product Data and Application

Product Features

Details the immersion type liquid-filled sensing element and two snap switches. Highlights key operational aspects.

Controller Specifications

Installation Procedures

Safety Precautions and General Guidance

Covers reading instructions, technician qualifications, and general installation advice.

Electrical Shock Hazard Warning

Critical safety warning about disconnecting power before installation to prevent shock.

Mounting Instructions

Step-by-step guide on how to physically mount the controller onto the boiler tapping.

Wiring and Connections

Safety Warnings for Wiring

Highlights electrical shock and explosion hazards related to wiring the controller.

Connecting to B-B Terminals

Procedure for connecting wires to the controller's tab terminals.

Connecting to R-R Terminals

Procedure for connecting wires to the controller's push-in terminals.

Operation Principles

High Limit Operation

Explains how the high limit switch controls the burner based on water temperature.

Low Limit and Circulator Operation

Describes how low limit and circulator switches function with differentials.

Example Scenarios