Honeywell L4081 Installation Manual

L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS

INSTALLATION

When Installing This Product…

1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition.

2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application.

3. Installer must be a trained, experienced service technician.

4. After installation is complete, check out product operation as provided in these instructions.

CAUTION: EXCESSIVE HANDLING OR SHARP BENDS CAN DAMAGE THE CAPILLARY.

WARNING

Electrical Shock Hazard. Can cause serious injury, death or equipment damage.

Disconnect power supply before installation to prevent electrical shock or equipment damage.

NOTE: These devices can be installed in any position.

Proper location, sizing and threaded boiler tapping are required.

1. Maximum pressure rating for these models is

200 psi (1380 kPa)

2. Maximum permissible ambient temperature as

sensing bulb is 265°F (130°C); at switches, 150°F (66°C).

3. The L6081C is without enclosure or well

assembly.

Mounting

Followinstructions provided by system manufacturer, if available. Otherwise, proceed as follows:

1. Drain the boiler if the system is filled with water.

2. Place the front of the controller down on a horizontal

surface and gently raise the sensing bulb until it is at a right angle with the back of the case and centered with the alrge hole in the case. This requires bending the capillary tube, but be sure to make no sharp bends and no bends near the bulb.

NOTE: Some models have an adjustable tubing length to

3 in. (76 mm). In these models, extra tubing inside the case can be pulled out, if needed. See Fig. 3.

SENSING ELEMENT IS FACTORY FORMED FOR 1.5 IN.

INSULATION WELL ASSEMBLIES. FOR 3 IN. INSULATION WELL ASSEMBLIES, PULL OUT

SUFFICIENT CAPILLARY TO ASSURE THAT THE CAPSULE BOTTOMS IN THE WELL.

STRAIGHTEN CAPILLARY SUFFICIENTLY SO IT DOES NOT

INTERFERE WITH INSERTION OF THE CAPSULE INTO THE WELL.

M888

Fig. 3. Adjusting the capillary length.

3. Adjust the position of the bulb so tht the bulb projects

4-7/8 in. (124 mm) from the back of the case for immersion well designed for 1-1/2 in. (38 mm) insulation; or 6-3/8 in. (162 mm), if designed for 3 in. (76 mm) insulation. If this requires bending the tube inside the case, insert the end of your index finger through the hole and carefully mold the tube into the correct shape as you gently pull (or push) the bulb to the correct position. The bulb must project the right distance so that after the case in installed, the spring force of the capillary tube holds the bulb against the inner end of the well for good thermal contact. The tube must be straight for at least 3/8 in. (10 mm) inside the case so the end of the well spud does not strike the coiled tube and pull the bulb away from contact with the inner end of the well.

4. Remove the plug from a properly located boiler tapping.

5. Apply pipe dope sparingly to the threads of the well,

then screw the well tightly into the boiler tapping.

6. Fill the system with water, then carefully examine around the threads for leakage. Tighten the well if necessary to stop any leakage.

7. Loosen the wallclamp screw three or four turns., move the screw in and out and not how it moves the well clamp. See Fig. 4. Loosen the screw enough so that when the screw is pushed inward, the T-shaped clamp guide is at the far end of the slot in the case.

8. Mount the case on the well spud in any position that facilitates wiring. With the case in final position, carefully insert the sensing bulb into the well until the case slips over the end of the well spud and fits squarely against the shoulder of the spud.

60-2105—6 4

NOTE: Open the clamp to receive the spud by pushing in

the well clamp screw.

9. While holding the case in the correct position, firmly tighten the well clamp screw.

STRIP

2 T

GAUGE

WELL CLAMP SCREW

L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS

3. 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.

4. Remove the screwdriver when complete.

LOW LIMIT/ CIRCULATOR DIFFERENTIA ADJUSTMENT

LOW LIMIT SETPOINT ADJUSTMENT

HIGH LIMIT SETPOINT ADJUSTMENT

JUMPER SLOT

M8848

Fig. 4. L6081A with cover removed to show adjustments.

WIRING

WARNING

Electrical Shock Hazard. Can cause serious injury, death or equipment damage.

Disconnect the power supply to prevent electrical shock or equipment damage.

IMPORTANT

Use care to avoid strain on the control case when using cable or conduit.

Jumper

When using the controller field addable jumper (Fig. 4), connect terminals R-R. When the jumper is added, make sure

that the two prongs of the jumper face the center of the controller.

CIRCULATOR

2431

4V HERMOSTAT

RA832A SWITCHING RELAY

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND

OVERLOAD PROTECTION AS REQUIRED. B TERMINALS ARE TAB TERMINALS.

L1 (HOT)

L4081A

1R2

BRB

HIGH LIMIT

LOW LIMIT

JUMPER REMOVED

VR8300 LOW VOLTAGE GAS VALVE

M8846

WARNING

Fig. 5. L4081A used with gas burner (line voltage limit).

Explosion Hazard. Can cause serious injury, death or property damage.

Use this product only in a system with a pressure relief valve.

Alll wiring must comply with all applicable local codes and ordinances. See cover insert for electrical load ratings. Refer to Fig. 5 through 9 for typical wiring diagrams.

Use the following procedure when connecting wires to the B-B tab terminals (Fig. 4):

1. Connect no. 14, 16, or 18 solid, or no. 14 or 16 unistranded wire to the tab terminals.

2. Strip insulation from the end of each wire.

3. use the included wire nut from the bag assemblyh to

connect the tab terminal connector to the wire.

4. Connect the wire to the tab terminal.

Use the following procedures when connecting wires to the R-R terminals (Fig. 4):

1. Use no. 14, 16, or 18 solid, or no. 14 or 16 unistranded wire for connecting the push-in terminals.

Fig. 6. L4081B used to prevent circulator opertion with

2. Strip the insulation from the end of each wire.

5 60-2105—6

L1 (HOT)

BRW

L4081B

BURNER CONTROL

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

B IS A TAB TERMINAL.

HIGH LIMIT

CIRCULATOR

JUMPER REMOVED

CIRCULATOR RELAY

CIRCULATOR MOTOR

M8787

boiler water temperature below low limit setting.

L4081A,B AND L6081A,C MULTIPLE AQUASTAT® CONTROLLERS

2 T S

)

2 T

CIRCULATOR

4V HERMOTAT

1R1

RA89A SWITCHING RELAY

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

B TERMINALS ARE TAB TERMINALS.

(HOT)

PILOTSTAT® CONTROL

HIGH LIMIT

L4081A

LOW LIMIT

GAS VALVE

M8788

L1 (HOT

Fig. 7. L4081A used with burner cycled from the water temperature.

(HOT)

BLACK

L1 (HO

4V HERMOSTAT

CIRCULATOR

RA832A SWITCHING RELAY

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

B TERMINALS ARE TAB TERMINALS.

1R1

1R2

HIGH LIMIT

L4081A

LOW LIMIT

OIL PRIMARY CONTROL

WHITE

JUNCTION BOX

M8786

Fig. 8. L4081A used with oil burner.

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