Honeywell L4068 User manual

L’ Honeywell

THE L4068A,C,E,F FAN CONTROLS OPER-

ATE THE FURNACE FAN MOTOR IN

RESPONSE TO PLENUM TEMPERATURE

IN FORCED AIR HEATING SYSTEMS.

L4068G ATTIC FAN CONTROL OPERATES

AN ATTIC VENTILATION FAN IN RE-

SPONSE TO ATTIC AIR TEMPERATURE.

THE L6068 AIR SWITCH IS USED IN

DOWNFLOW FURNACES TO PREVENT

REVERSE AIR CIRCULATION AND TO

ii PROVIDE PROTECTION AGAINST EX-

CESSIVE TEMPERATURES CAUSED BY

CLOGGED FILTERS. THE L6068 CAN

ALSO BE USED TO CONTROL A 2-

SPEED FAN.

q L4068 has spst switch; L6068 has spdt

switch.

q L4068A,C,E,F have adjustable FAN OFF

and differential settings.

q L4068G has adjustable FAN OFF setting,

fixed differential setting.

(3 L6068 available with fixed or adjustable

temperature setting; differential is fixed.

q MAN-AUTO fan lever standard on L4068E,

F; optional on L4068G.

q Bimetal sensing element actuates switch.

q Push-in terminals.

q Available with and without case and cover.

L J.A.

1-76 t.059)

TRADELINE MODELS

Tradeline models are selected and packaged to provide ease of stocking, ease of handling, -and maximum

replacement value. Tradeline model specifications are the same as those of standard models except as noted below.

TRADELINE MODELS AVAILABLE: DIFFERENTIAL: Adjustable, 20 to 50 F [11 to

L4068C Fan Control less MAN-AUTO fan lever, 28 C] . L4068F factory-set at 25 F [-4 C] .

less case and cover. ADDITIONAL FEATURES:

L4068E Fan Control with MAN-AUTO fan lever, l Two No. 8 x l/2 in. sheetmetal mounting screws

with case and cover. provided.

L4068F Fan Control with MAN-AUTO fan lever, l Case and cover assembly, Part No. 132475E,

less case and cover. available for L4068C,F.

FAN OFF SETTING: Adjustable, 80 to 120 F [27 to l Tradeline pack with cross reference label and

49 C] . L4068F factory-set at 100 F [38 C] . special instruction sheet.

STANDARD MODELS

MODELS:

L4068A Fan Control, less MAN-AUTO fan lever, with

case and cover.

L4068C Fan Control, less MAN-AUTO fan lever, less

case and cover.

L4068E Fan Control, with MAN-AUTO fan lever,

with case and cover.

L4068F Fan Control, with MAN-AUTO fan lever,

less case and cover.

L4068G Attic Fan Control, MAN-AUTO fan lever

optional, with case and cover.

L6068A Air Switch, adjustable temperature setting,

with case and cover.

L6068D Air Switch, fixed temperature setting, with

or without case and cover.

ELECTRICAL RATING (amperes):

L4068A.C.E.F

120V AC 240V AC

Full Load 14 7

Locked Rotor 84 42

Pilot Duty-50 VA at 24V ac.

L4068G

4.4 amps full load, 26.4 amps locked rotor at

120V ac; 50 VA at 24V ac pilot duty.

L6068

::,-,,

50 VA at 24V ac pilot duty. Maximum connected

load 2000 VA.

SWITCHING:

L4068 spst, snap acting makes on temperature rise.

L6068 spdt, snap acting makes R-W, breaks R-B

on temperature rise.

SETTINGS:

L4068A,C,E,F-80 to 120 F [27 to 49 C] adjustable

FAN OFF setting.

(continuedon page3)

COMPLETE ORDERING NUMBER. 4. FIXED OR ADJUSTABLE DIFFERENTIAL ON

SPECIFY- L4068A,C,E,F.

1. ORDER NUMBER, TRADELINE IF DESIRED. 5. ELEMENT INSERTION LENGTH.

2. VOLTAGE AND FREQUENCY. 6. OPTIONAL SPECIFICATIONS, IF DESIRED.

3. TEMPERATURE SETTING DESIRED ON L6068D. 7. ACCESSORY, IF DESIRED.

IF YOU HAVE ADDITIONAL QUESTIONS, NEED FURTHER INFORMATION, OR WOULD LIKE TO COMMENT ON OUR

PRODUCTS OR SERVICES, PLEASE WRITE OR PHONE:

1. YOUR LOCAL HONEYWELL RESIDENTIAL DIVISIONSALES OFFICE (CHECK WHITE PAGES OF PHONE DIRECTORY).

2. RESIDENTIAL DIVISION CUSTOMER SERVICE

HONEYWELL INC., 1885 DOUGLAS DRIVE NORTH

MINNEAPOLIS, MINNESOTA 55422 (812) 542-7500

(IN CANADA-HONEYWELL CONTROLS LIMITED, 740 ELLESMERE ROAD, SCARBOROUGH, ONTARIO MlP 2V9)

INTERNATIONAL SALES AND SERVICE OFFICES IN ALL PRINCIPAL CITIES OF THE WORLD.

Page

L4068G-70 to 110 F [21 to 43 C] adjustable FAN

OFF setting.

L6068A-125 to 165 F [52 to 74 C] adjustable

temperature setting.

L6068D-fixed at 150, 165, or 200 F [66, 74, or

93 C] temperature setting (200 F [93 C] model

less case and cover).

DIFFERENTIAL:

L4068A,C,E,F-20 to 50 F [ll to 28 C] adjustable

differential, or 35 F [20 C] fixed.

L4068G-12 F [7 C] nominal fixed differential.

L6068-20 F [44 C] nominal fixed differential.

SENSING ELEMENT: Flat blade bimetal on all models.

ELEMENT INSERTION LENGTH: 3 or 7 inches.

L4068A,C,E,F-3 or 7 inches.

L4068G-3 inches.

L6068A-3 or 7 inches.

L6068D-3 inches.

ADJUSTING MEANS (L4068 only): Knobs on the face

of control for models with adjustable FAN OFF

and fan differential settings.

MOUNTING MEANS:

L4068A,C,E,F; L6068

With case and cover-two screw holes in back of

case.

Less case and cover-two notches for screws in

back of switch.

L4068G

Four screw holes in back of case.

MAXIMUM AMBIENT TEMPERATURE: All models-

at switch 190 F, at bimetal350 F.

WIRING KNOCKOUTS:

L4068A,E; L6068 with case and cover only-one

in top and one in bottom of case for l/2 inch

conduit.

L4068G-one in top of case for l/2 inch conduit.

FINISH (models with cover only): Gray.

DIMENSIONS:

L4068F 2-314 l-718 2-318

L6068A 3-314 2-5116 2

L6068Da 3-314 2-5116 2

L6068D 2-314 I-718 I-311 6

awith case and cover.

CANADIAN STANDARDS ASSOCIATION COMPO-

NENT RECOGNIZED: File No. LR1322, Guide

No. 400-E-0.

OPTIONAL SPECIFICATIONS:

1. L4068A with Celsius scale-25 to 50 C FAN OFF

setting range, 10 to 25 C adjustable differential.

2. L4068G with MAN-AUTO fan lever.

ACCESSORY: Case and cover assembly, Part No.

132475E, for L4068C,F. Assembly includes case,

cover, decal, one self-tapping screw for mounting

control in case, and two sheetmetal screws for

mounting case.

Installer must be a trained, experienced

serviceman.

Disconnect power supply before connecting

wiring to prevent electrical shock or equipment

damage.

Do not exceed ambient temperature limitations

in any application; see SPECIFICATIONS.

Always conduct a thorough checkout when

installation is complete.

L6068 LOCATION

Downflow furnaces-Locate the L6068 between the

filter(s) and the heat exchanger where air circulation

is not restricted by baffles. Element must not touch

any internal part of furnace.

Two-speed fan control-Locate the L6068 in the

furnace outlet or plenum where it will be exposed to

the most rapid temperature change and where it will

be affected as much as possible by changing average

temperature of outlet air with minimum dependence

on radiant heat. Element must not touch any internal

part of furnace.

On L4068A,C,E,F and L6068 follow instructions

furnished by the furnace or burner manufacturer, if

available. Otherwise, proceed as follows. On L4068G

follow instructions given below.

LOCATION AND MOUNTING

L4068A,C,E,F LOCATION

L-

Locate the element in the plenum where it will be

exposed to the most rapid temperature changes. It

should be affected as much as possible by the temper-

ature of outlet air with minimum dependence on radiant

heat. Element must not touch any internal part of the

furnace.

ELEMENT TOO FAR

FROM HEAT SOURCE

ELEMENT IN AIR

FLOW AT AVERA

ELEMENT IN

FIG. I-LOCATION OF SENSING ELEMENT.

Page

3 60-2260

MOUNTING L4068A,C,E,F; L6068

NOTE: If the existing element mounting is suitable,

proceed to step 7. If existing mounting is unsuitable,

install the case as follows.

1. Make opening in plenum. See Figs. 2 and 3 for

dimensions. If modifying existing opening which is

too small, enlarge it. If existing opening is too large,

use an asbestos gasket to decrease hole size, or cover

opening with a piece of sheetmetal and cut a new hole.

FIG. S-MOUNTING DIMENSIONS IN INCHES [MIL-

LIMETRES IN BRACKETS] FOR L4068A,E

AND L6068A WITH CASE AND COVER.

Page

FIG. 3-MOUNTING DIMENSIONS IN INCHES LMIL-

LIMETRES IN BRACKETS] FOR L4068C.F

AND L6068D WITHOUT CASE AND COVER.

2. Remove cover from case.

3. Position case over plenum opening and mark

mounting holes.

4. Drill or punch holes for mounting screws.

5. Remove knockouts from case.

6. Using two sheetmetal screws furnished, fasten

case to plenum or furnace.

7. Insert element into plenum.

8. Fasten control securely to furnace or case using

backplate mounting screw.

9. After wiring and adjustments are complete,

replace cover.

NOTE: Manual fan lever on L4068E,F has a break-

awav arm. If cover to be used has no fan lever

opening, snap off lever by bending with fingers be-

fore placing cover on control.

L4068G LOCATION AND MOUNTING

The L4068G is mounted on any convenient stud or

rafter in the attic. Mount the L4068G at the selected

location using two screws through the mounting holes at

the back of the case. Mount as shown in Fig. 4.

6748

FIG. 4-MOUNTING THE L4068G IN THE ATTIC.

WIRING

All wiring must agree with applicable electrical codes

and ordinances.

L4068A,C,E,F; L6068

Follow any wiring instructions furnished with heating

system. In a replacement installation, make certain the

L4068 or L6068 is wired in the system to operate the

same way as the old control.

NOTE: Two common terminals (with internal jumper)

are provided so that power may be provided to the

line voltage limit switch without splicing. Connect

the “hot” wire from the power supply to the upper

left terminal. On L4068, connect the fan motor to

the bottom terminal (marked LOAD); connect limit

switch, if wired in the line voltage circuit, to the

upper right terminal. Figs. 5-10 show typical wiring

diagrams.

FIG. 5-TYPICAL WIRING FOR L4066A,C,E,F

USED IN FORCED AIR HEATING SYSTEM.

FIG. 6-TYPICAL OIL BURNER SYSTEM WITH

LIMIT SWITCH IN LINE VOLTAGE CIRCUIT.

24 VOLT

THERMOSTAT

NTERMITTENT

GNITION OIL

IURNER PRIMAR

ONTROLLER

BURNER MOTOR FAN MOTOR

PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION

AS REQUIRED.

n 2 FOR 24 VOLT GAS SYSTEMS. CONNECT THE PRIMARY SIDE

OF THE TRANSFORMER AT THE MARKED LOCATIONS. SEE

GAS VALVE INSTRUCTIONS FOR COMPLETlON OF WIRING.

2803A

POWERPILE

PILOT

GENERATOR CONTROLLER L4068

FAN

rCONTROLLER

~~~~~T~

TWO WIRE

POWERPILE MOTOR

THERMOSTAT

ppp:Y

POWER

1 PROVlDE DISCONNECT MEANS AND OVERLOAD PROTECTION

AS REQUIRED. 2802A

FIG. 7-TYPICAL SELF-POWERED GAS SYSTEM

WITH LIMIT SWITCH IN MILLIVOLT CIR-

CUIT AND FAN SWITCH IN LINE CIRCUIT.

COMBINATION

FAN AND LIMIT

TO GAS VALVE

CONTROLCIRCUIT

A PROVIDE DISCONNECT MEANSAND OVERLOAD PROTECTION

AS REQUIRED. Z001A

FIG. 8-TYPICAL WIRING CONNECTIONS FOR

16068 USED AS A SECONDARY LIMIT AT

THE FILTER OF A DOWNFLOW FURNACE.

R-W MAKES, R-B BREAKS ON TEMPERA-

TURE RISE TO SET POINT.

A FAN

L6068 2 CONTROLLER

POWER

SUPPLY

HIGH LIMIT

CONTROLLER

TRANSFORMER

FAN MOTOR

TO GAS-VALVE

CONTROL CIRCUIT

A PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION

AS REQUIRED.

A 2 L6068 SET POINT MUST BE HIGHER THAN FAN CONTROLLER

SET POINT. 28008

FIG. g-TYPICAL WIRING CONNECTIONS FOR

L6068 USED TO CONTROL A TWO-SPEED

FAN MOTOR. R-W MAKES, R-B BREAKS ON

TEMPERATURE RISE TO SET POINT.

L4068G

Wire L4068G to turn on the fan when attic tempera-

ture rises to control point. See Fig. 4.

1 POWER SUPPLY. PROVIDE OVERLOAD PROTECTION AND DISCONNECT

MEANS AS REQUIRED. rra,

FIG. IO-WIRING L4068G TO CONTROL AN ATTIC

FAN.

Page

5 60-2260

CONNECTING TO PUSH-IN TERMINALS

To connect the push-in terminals use the following

procedure:

1. No. 14, 16, or 18 solid or No. 14 or 16 stranded

wire may be connected to these terminals. Do not con-

nect aluminum wire to the push-in terminals on this

device.

2. Strip insulation from wires the exact length shown

by the strip gauge on the front of the switch.

3. If stranded wire is used, insert a small screwdriver

into the rectangular hole (marked ,) on the front of

the switch above the round terminal hole; push inward

and hold. Insert wire into round terminal hole and re-

move screwdriver (Fig. 5). If solid wire is used, it may

be inserted into the round terminal hole without using a

screwdriver.

To disconnect either stranded or solid wire, proceed

as follows:

1. Insert a screwdriver into the rectangular hole

(marked ,) on the front of the switch. Push inward

to release grip on wire.

2. With grip released, pull wire out of round terminal

hole.

PVSH-IN

TERMINALS

“FAN OFF”

ADJUSTMENT KNOB

FAN DIFFERENTIAL

KNOB

FIG. II-INTERNAL VIEW OF L4068 FAN CON-

TROL, SHOWING USE OF PUSH-IN

TERMINALS.

PUSH SCREWDRIVER IN AND

“OLD TO RELEASE WIRE

MOUNTING HOLE (2)

(CASE AND COVER

PUSH-IN RELEASE

PUSH IN TERMINAL (31

R AND RARE COMMbf.4

-SET PO, NT

BACKPLATE

MOUNTING SCREW

WIRING KNOCKOUT (2)

FIG. 12-INTERNAL VIEW OF L6068,SHOWING USE

OF PUSH-IN TERMINALS.

L4068G

BEFORE ADJUSTING SET POINT KNOB, MAKE

SURE INSULATOR FLAP COVERS TERMINAL

SCREW BELOW KNOB.

On L4068G, the fan differential is fixed at 12 F [7 C]

nominal. The fan will start when attic temperature rises

about 12 F [7 C] above the FAN OFF setting. For

example, when the FAN OFF setting is 85 F [29 C] , the

fan will start at about 85 F [29 C] plus 12 F [7 C] , or

about 97 F [36 C] .

L4068 SETTINGS

FIXED DIFFERENTIAL

L4068A,C,E,F

On some models, the differential is fixed at approxi-

mately 35 F [20 C] . The fan starts when the plenum

temperature rises 35 [20 C] degrees above the FAN OFF

setting. For example, when the FAN OFF setting is

100 F [38 C], the fan starts at approximately 100 plus

35 or 135 F [38 plus 20 or 58 C] .

ADJUSTABLE DIFFERENTIAL (L4068A,C,E,F)

Models with adjustable differential may be set between

20 and 50 F [11 to 28 C] . Differential is factory-set at

25 F [14 C] . The fan starts when the plenum temperature

rises to the FAN OFF setting plus the differential

setting. For example, when the FAN OFF setting is

100 F [38 C] and the differential is set at 25 F [14 C] ,

fan starts when temperature rises to 125 F [52 C] and

stops when temperature drops to 100 F [38 C] . Changing

the differential changes the FAN ON temperature only.

Page

FAN OFF SET POINT

Set FAN OFF to temperature recommended by burner

or attic fan manufacturer. On replacement installations,

use temperature set on old control.

NOTE (L4068A,C,E,F): If the fan runs too long after

‘v burner shutdown (as evidenced by cold drafts), raise

the FAN OFF setting. Raising the FAN OFF setting

simultaneously raises the FAN ON setting by the same

amount. If the fan does not run long enough after

burner shutdown (as evidenced by recycling), lower

the FAN OFF setting.

L6068 SETTING

The L6068 switch makes R-W and breaks R-B when

the temperature at the sensing element rises to the

set point. When the temperature falls 20 F [11 C] below

the set point, the switch breaks R-W and remakes R-B.

On the L6068A the set point is adjustable from 125

to 165 F [52 to 74 C] ; turn the knob on front of the

switch until indicator points to the temperature, at

which the switch should break R-B and make R-W.

CHECKOUT

\--_/ L4068A,C,E,F

After mounting and wiring are complete, turn on the

power supply and allow the system to operate through

one complete cycle. To check the furnace limit control,

disconnect the fan and set the thermostat to call for

heat. The burner should come on and the limit control

should shut off the burner when the plenum temperature

reaches the limit control set point. Reconnect the fan.

Again set the thermostat to call for heat. The burner

should come on and the fan should come on when the

plenum temperature reaches the FAN ON set point.

L4068G -

After mounting and wiring are complete, turn on the

power supply and turn FAN OFF setting more than 12 F

[7 C] below attic temperature. Fan should come on.

Turn setting dial above attic temperature. Fan should go

off. Reset control to desired FAN OFF setting.

L6068 USED AS A SECONDARY LIMIT CONTROL

After completing mounting and wiring, turn on the

power supply and let the system operate through one

complete cycle. Actuate the control by blocking the

filter until the temperature reaches the set point of

the L6068. At this point the furnace should cut out

and the fan should start or continue operating.

L6068 USED AS A TWO-SPEED FAN CONTROL

After mounting and wiring are completed, turn on

power supply. Set thermostat to call for heat. Fan

should first come on low speed. After a short period

of operation, the L6068 should change the fan speed to

high.

HONEYWELL MINNEAPOLIS, MINN. 55408 INTERNATIONAL Sales Offices in all principal cities of the world. Manufacturing in

Australia, Canada, Finland, France, Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A. PRINTED IN U.S.A.

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