Submittal Sheet

ManualsBrandsResideo ManualsAquastats & WellsHigh & Low Limit Aquastat, 10°F Fixed, 10-25°F Differential

PRODUCT DATA

60- 2105- 6

® U.S. Registered Trademark

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.

Contents

Application ........................................................................ 1

Features ........................................................................... 1

Specifications ................................................................... 2

Ordering Information ........................................................ 2

Installation ........................................................................ 4

Wiring ............................................................................... 5

Operation .......................................................................... 7

Settings ............................................................................ 8

Checkout .......................................................................... 9

Material Safety Data Sheet .............................................. 10

Summary of content (12 pages)

PAGE 1
L4081A,B and L6081A,C Multiple Aquastat® Controllers PRODUCT DATA 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.
PAGE 2
L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS SPECIFICATIONS IMPORTANT The specifications given in this publication do not include normal manufacturing tolerances. Therefore, this unit may not exactly match the listed specifications. Also, this product is tested and calibrated under closely controlled conditions, and some minor differences in performance can be expected if those conditions are changed.
PAGE 3
L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS Approvals: Underwriters Laboratories Inc. Listed (L4081A,B and L6081A): File No. MP466, guide No. MBPR. Component Recognized (L6081C): File No. MP466, Guide No. MPBR2. Canadian Standards Association Component Recognized (L4081A,B and L6081A): File No. LR1620, Guide No. 400-E-0. WELL-CLAMP SCREW INSULATION DEPTH, 1-1/2 (38) OR 3 (76) 7/8 IN. (22 MM) DIA. KNOCKOUT FOR 1/2 IN. (12.5) CONDUIT (6) MAXIMUM INSERTION 3-1/2 (89) 1-3/16 (30) 1-13/64 (2) (30.
PAGE 4
L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS INSTALLATION When Installing This Product… 1. 2. 3. 4. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. Installer must be a trained, experienced service technician. After installation is complete, check out product operation as provided in these instructions.
PAGE 5
L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS 3. STRIP GAUGE WELL CLAMP SCREW 4. Insert a screwdriver into the rectangular slot near the terminal and hold it in the slot while inserting the wire into the terminal hole as far as possible. Remove the screwdriver when complete. Jumper LOW LIMIT/ CIRCULATOR DIFFERENTIAL ADJUSTMENT When using the controller field addable jumper (Fig. 4), connect terminals R-R.
PAGE 6
L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS L2 L1 (HOT) 1 PILOTSTAT® CONTROL L1 (HOT) L2 1 CIRCULATOR 4 2 1 3 1R1 B B R R LOW LIMIT 24V THERMOSTAT HIGH LIMIT 2 L4081A T T 1R GAS VALVE RA89A SWITCHING RELAY 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 B TERMINALS ARE TAB TERMINALS. M8788 Fig. 7. L4081A used with burner cycled from the water temperature.
PAGE 7
L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS JUNCTION BOX R4184D PROTECTORELAY™ CONTROL SS BLACK 1K2 ORANGE 1K BURNER MOTOR CAD CELL F SOLID STATE SWITCH OIL VALVE 1K1 SAFETY SWITCH HEATER IGNITION WHITE F L1 (HOT) 1 L2 CIRCULATOR B 2 4 24V THERMOSTAT 3 1 2 B W 1R1 R L6081A T 1R T 1 RA89A SWITCHING RELAY R JUMPER ADDED POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 B TERMINALS ARE TAB TERMINALS. M8855 Fig. 9.
PAGE 8
L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS SETTINGS 240°F (116°C) Because heating systems differ, follow the boiler manufacturer recommendations when selecting temperature settings. SWITCH BREAKS ON RISE. BURNER TURNS OFF. HIGH LIMIT SETTING 10°F (5.6°C) DIFFERENTIAL Study the applicable chart in Fig. 10, which shows the switching response to temperature changes.
PAGE 9
L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS CHECKOUT KNOB SET AT 180°F (82°C) After completing installation and controller settings, operate the system. Carefully observe the operation of all components through at least one complete cycle. Be sure to include a check of the high limit switch operation. Make any correction needed; then repeat the checkout. Repeat until system operates properly.
PAGE 10
L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS MATERIAL SAFETY DATA SHEET Section 1. Product and Company Identification. Manufacturer: Honeywell Inc., 1985 Douglas Drive North, Minneapolis, MN 55422. Product Name: Heat conductive compound. Date Released: October 8, 1999. MSDS ID: DS9021. NFPA Ratings: Health 0; Flammability 1; Reactivity 0; Personal Protection B. Synonyms: MS1699. Product Use: Heat conductive material used to enhance contact and heat transfer in temperature sensor applications.
PAGE 11
L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS Section 3. Hazard Identification Explosion Hazards: None. Aluminum powder can react with water to release flammable hydrogen gas. In the form of this product, this reaction is not expected. Acute Health Effects: Skin—Excessive contact can cause skin irritation and dermatitis. Section 6. Accidental Release Measures Eye—Direct contact with eye will cause irritation. Scrape up and dispose as solid waste in accordance with state and federal regulations.
PAGE 12
L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS Section 14. Transportation Information Incompatibilities: Strong oxidizing agents and halogens. DOT Classification: Hazardous Decomposition Products: Not classified as hazardous. Carbon dioxide, carbon monoxide. Section 15. Regulatory Information Section 11. Toxicology Information No data available. SARA Title III Supplier Notification: Section 12.