Honeywell L6081 Installation Manual

L6081A

Aquastat® Controller

INSTALLATION INSTRUCTIONS

APPLICATION

The L6081A is a triple function controller; it is used as a high limit, low limit, and circulator control. This controller is designed to replace the controls listed in Table 1.

Table 1. Controls L6081A Replaces.

Honeywell General Controls

L401A L4010B L4062A L4062B L4081A,B L6062A L6081A,C

All require a 124904 Well Adapter to fit L6081A case to well (order separately, see form 68-0040, Wells and Fittings for Temperature Controllers).

Well for L6081A must be added when replacing these models.

L52F L52G L52H L52J L52K L52L

480 DA-36-153

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.

WARNING

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

Use this product only in systems with pressure relief valves.

When replacing some of these controls, only 1 or 2 of the L6081A switching functions may be needed. Refer to Fig. 2 to determine which terminals are used in a given application.

Mercoid

443AT 447G 4432X 4420 4433 4420X 4433X 4422 4436 4422X 4437

Penn

4432

White Rodgers

11A61 11C61

1131 1135 11C30 1115 11C31

WARNING

Electrical Shock Hazard. Can cause serious injury or death.

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

NOTE: If new immersion well is needed, refer to form

68-0040 Wells and Fittings for Temperature Controllers for ordering information.

Mounting

Follow the mounting system manufacturer instructions if available; otherwise, proceed as follows:

1. Turn off power and drain the system if necessary.

2. Remove old control.

3. loosen the captive cover mounting screw on the

L6081A and pull off the cover.

95- 6701- 5

L6081A AQUASTAT® CONTROLLER

IMPORTANT:

Best thermal response is obtained with a well that snugly fits the sensing bulb.

If well does not snugly fit bulb, use the heat-conductive grease. Fold the plastic bag of grease lengthwise and twist it gently. Then snip off end of bag and work the open end all the way into the well. Slowly pull out bag while squeezing it firmly to distribute grease evenly in the well. Insert bulb all the way to the bottom of the well. Bend the tubing, if necessary, to hold the bulb against the bottom of the well and to hold the outer end of the bulb in firmly to the side of the well (Fig. 1). Wipe excess grease off outer end of the well.

CONTROLLER CASE

IMMERSION WELL CLAMP

IMMERSION WELL SPUD

ADAPTER

(C)

CAPILLARY TUBE

SETSCREW

IMMERSION WELL CLAMP SCREW

BEND THE CAPILLARY TUBE TO HOLD THE SENSING BULB IN GOOD THERMAL CONTACT WITH THE IMMERSION WELL AT POINTS (A) AND (B).

ASSURE THAT CAPILLARY TUBE FITS FREELY IN THE ADAPTER SO THE TENSION OF THE CAPILLARY TUBE AT POINT (C) HOLDS THE SENSING BULB IN GOOD THERMAL CONTACT WITH THE IMMERSION WELL AT POINT (D).

BOILER

SHORT TUBE FITS IN CENTRAL RECESS OF ADAPTER

Fig. 1. Use of adapter and proper position of sensing bulb in immersion well.

6. If the immersion well from the old control does not

fit into the clamp on the back of L6081A case, use the 124904 Well Adapter (order separately, see form 68-0040, Wells and Fittings for Temperature Controllers). a. Fit sensing element capillary into the adapter

groove (Fig. 1).

b. Fasten the adapter to the case. Make certain

that the clamp is properly positioned on the adapter and the adapter flange fits snugly into the opening in the case.

c. Apply heat-conductive grease as instructed

above.

d. Insert the bulb and adapter into the well. The

sensing element bulb must bottom in the well for best temperature response. (A slight bend in the tubing will hold the bulb against the well.) See Fig. 1.

e. Tighten the setscrew. Make certain that the

adapter groove is on the opposite side of the setscrew (Fig. 1).

4. Loosen the insertion well clamp screw (Fig. 1).

5. If the immersion well from the old control fits into

the clamp on the back of the L6081 case, proceed as follows. If it does not, go to step 6 below. a. Apply heat-conductive grease as instructed

above. b. Insert the sensing element into the well. c. Fasten the case to the well with the clamp

screw. Make certain that the clamp is properly

positioned on the well and the well flange fits

snugly into the opening in the case. The

sensing element bulb must bottom in the well

for best temperature response. (A slight bend

in the tubing holds the bulb against the well.)

See Fig. 1.

(A)

BACK OF

CONTROLLER

CASE

OLD IMMERSION WELL ASSEMBLY

IMMERSION WELL CLAMP SCREW

HEAT-CONDUCTIVE COMPOUND

ADAPTER

IMMERSION WELL CLAMP

SENSING BULB

(B)

M8830

(D)

WIRING

WARNING

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

Disconnect power supply to prevent electrical shock or equipment damage.

All wiring must comply with local electrical codes. Make certain that the electrical requirement of the controlled equipment does not exceed the rating shown inside the L6081A cover. Follow the hookup instructions furnished by the system manufacturer.

IMPORTANT:

L6081A terminals are approved for copper wire only.

Use Fig. 2 to determine which switches to use when replacing the existing control. For example, if the existing control has high limit and circulator control switch terminals, use terminals R and B on the left side of the switch for the high limit and the R and W terminals on the right side of the switch to control the circulator.

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