Honeywell L482A User manual

L482A

Low Limit Controller

INSTALLATION INSTRUCTIONS

BEFORE INSTALLATION

No special tools are required to install the L482A Low Limit

Controller. Refer to the job drawings for specific wiring and

installation information.

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 ratings given in instructions and on the product to

ensure 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.

Mounting

IMPORTANT

1. The controller operates from the lowest temperature

along the entire 20 feet of the sensing element.

2. Locate controller case and bellows where ambient

temperature is always warmer than the set point.

3. For settings above the scale range midpoint it can be

necessary to locate the controller case close to a

steam pipe or other warm surface and make sure the

element does not extend across a cold surface.

Controller

Surface mount the controller (Fig. 1) vertically on any Fig. 1. L482A Low Limit Controller dimensions in in. (mm).

convenient location (including the duct itself). Orient the case

with the bellows positioned on the bottom.

SETPOINT

ADJUSTMENT

SCREW

4 (101)

2-3/32

(53)

7/8 (22) HOLE

FOR 1/2 CONDUIT

WITH 1-3/32 (28)

KNOCKOUT RING

FOR 3/4 CONDUIT

1-7/8

(48)

5/16

(8)

3/16 (5)

DIAMETER

MOUNTING

HOLE

3-1/4 (83)

5/16 (8)

1 (25)

1-1/8 (29)

3/8 X 3/16

(10 X 5)

DIAMETER

ELONGATED

MOUNTING

HOLE

C606A

SETPOINT

SCALE

4-11/16

(119)

MOUNTING

HOLES (2)

10-32 UNF-2B

THREAD

PUSH

RESET

20 FT BY 1/8 INCH

SENSING ELEMENT

® U.S. Registered Trademark

L482A LOW LIMIT CONTROLLER

Sensing Element

IMPORTANT

• The maximum allowable sensing element tempera-

ture is 250°F (121°C).

• Uncoil only the amount of element required for the

application.

• Bend element carefully and only as much as neces-

sary. Bends require a minimum radius of one inch

(25 mm).

• Bend only some distance from the controller.

• Pulling on the element damages it.

• For elements subject to vibration, provide protection

from any surface which the element contacts.

• Mount element horizontally as shown in Fig. 2 and 3.

1. Locate the sensing element where it can sense the

temperature of the air to be controlled.

NOTE: Locate the element away from hot or cold air

inlets.

2. Punch or drill a 1/4 in. hole in the duct and install

CCT1802 Grommet (Fig. 2) to protect the capillary.

3. Carefully insert the element through the grommet into

the duct. Use as much element as possible to provide

maximum protection.

4. Mount the element inside the duct or fasten to the coil if

freezing can occur.

a. Duct mounting: Use CCT2600 Clip (Fig. 2).

b. Coil fastening: Use perforated metal straps (Fig. 3).

Fig. 2. Element mounted to duct with CCT2600 Clips.

Fig. 3. Element mounted in duct with

perforated metal straps.

C789

GROMMET ELEMENT

CLIP

DETAIL

USE NO. 10

SHEET METAL

SCREWS

BEND HERE

NECESSARY

C790

WIRE FASTENINGSELEMENT

PERFORATED METAL STRAPS

OPERATION

On a temperature drop to setpoint, LINE 1 to M1 contacts

close and LINE 2 to M2 contacts open. Reset to the normal

state is manual.

WIRING

WARNING

Electrical Shock Hazard.

Can cause severe injury, death or equipment

damage.

Disconnect power supply before beginning installation

to prevent electrical shock or equipment damage.

IMPORTANT

– All wiring must agree with applicable codes,

ordinances and regulations.

– When switching both ac line voltage and an

automation input (Fig. 4), the input wires must

run no more than three feet in the same conduit.

See Fig. 6.

For typical L482A wiring, see Fig. 4 and 5.

NOTES:

– Screw terminals are provided for wiring

connections.

– Maximum wire size is 12 AWG.

– Use 8-32 x 1/4-inch screws for replacement if

necessary. Longer screws can interfere with the

switch mechanism and damage the switch.

(HOT)

TO STATUS

OR ALARM

INPUT OF

AUTOMATION

SYSTEM

LINE 2 LINE 1

M2 M1

FAN RELAY

C791

Fig. 4. Typical wiring diagram with automation input.

95-7432–1 2

996-496 Rev. A

L482A LOW LIMIT CONTROLLER

(HOT)

L2 FAN RELAY

LOCAL ALARM

C79

Fig. 5. Hookup providing freeze protection by shutting

down fan with line powered local alarm.

LINE 2 LINE 1

M2 M1

36 INCH

(914 MM)

MAXIMUM

CONDUIT

ELAY

JUNCTION

BOX

LINE 2 LINE 1

M1M2

AUTOMATIO

SYSTEM

C79

Fig. 6. Providing separate conduit for switched ac and

automation input wiring.

Adjustment

Turn the setpoint adjustment screw (Fig. 1) on the top of the

controller case to the value called for on the job drawings.

NOTES:

1. The setpoint adjustment is limited to 35-55°F

(2-13°C) by an internal physical stop.

2. The setpoint is factory set at 35°F. Setpoint is the

temperature at which LINE 1 to M1 contacts close

and LINE 2 to M2 contacts open on a temperature

fall. The controller differential is fixed at 5°F (3°C)

nominal and is additive to the setpoint.

3. The operating point drops for elevations above

sea level. To compensate, increase the setpoint

adjustment 1°F (0.6°C) above the required set-

point for each 1000 feet (305m) above sea level.

CHECKOUT

Because of the L482A limited setpoint range, operational

checkout can be difficult. Use one of the following methods to

verify proper controller operation:

1. If the ambient temperature is below 50°F (10°C):

a. Turn the setpoint adjustment through the ambient

temperature and note the switch action.

b. When the setpoint is increased to equal the ambient

temperature:

(1) LINE 1 to M1 contacts should close.

(2) LINE 2 to M2 contacts should open.

c. Decreasing the setpoint to 5°F (3°C) below the

ambient temperature should not affect the contact

positions.

d. Pushing the manual reset button should:

(1) Open contacts LINE 1 to M1

(2) Close contacts LINE 2 to M2.

2. If the ambient temperature is above 50°F (10°C):

a. Immerse at least one foot of the element in ice water

(or wrap same in ice).

b. As the element drops through the setpoint:

(1) LINE 1 to M1 contacts should close.

(2) LINE 2 to M2 contacts should open.

c. Remove the element from the ice water (or ice

wrapping).

d. As ambient temperature rises to 5°F (3°C) the set-

point, there should be no effect on contact positions.

e. Pushing the manual reset button should:

(1) Open contacts LINE 1 to M1.

(2) Close contacts LINE 2 to M2.

3 95-7432–1

996-496 Rev. A

Automation and Control Solutions

Honeywell International Inc. Honeywell Limited-Honeywell Limitée

1985 Douglas Drive North 35 Dynamic Drive

Golden Valley, MN 55422 Scarborough, Ontario

M1V 4Z9

996-496 Rev. A

Printed in U.S.A. on recycled

95-7432–1 B.B. Rev. 4-04

paper containing at least 10%

www.honeywell.com

post-consumer paper fibers.

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