Honeywell L4068, L4068F, L4068A, L4068E, L4068C User Manual

L’

ii

Honeywell

THE L4068A,C,E,F FAN CONTROLS OPER­ATE THE FURNACE FAN MOTOR IN
RESPONSE TO PLENUM TEMPERATURE
IN FORCED AIR HEATING SYSTEMS.
L4068G ATTIC FAN CONTROL OPERATES
AN ATTIC VENTILATION FAN IN RE­SPONSE TO ATTIC AIR TEMPERATURE.
THE L6068 AIR SWITCH IS USED IN
DOWNFLOW FURNACES TO PREVENT
REVERSE AIR CIRCULATION AND TO
PROVIDE PROTECTION AGAINST EX­CESSIVE TEMPERATURES CAUSED BY
CLOGGED FILTERS. THE L6068 CAN
ALSO BE USED TO CONTROL A 2­SPEED 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:

L4068C Fan Control less MAN-AUTO fan lever,

DIFFERENTIAL: Adjustable, 20 to 50 F [ 11 to

28 C] . L4068F factory-set at 25 F [ -4 C] .

less case and cover. ADDITIONAL FEATURES:

L4068E Fan Control with MAN-AUTO fan lever,

with case and cover.

l Two No. 8 x l/2 in. sheetmetal mounting screws

provided.

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

less case and cover.

FAN OFF SETTING: Adjustable, 80 to 120 F [ 27 to

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

available for L4068C,F.

l Tradeline pack with cross reference label and

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.

L4068G

4.4 amps full load, 26.4 amps locked rotor at
120V ac; 50 VA at 24V ac pilot duty.

L6068

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

240V AC

7

42

Full Load
Locked Rotor

120V AC

14

84

Pilot Duty-50 VA at 24V ac.

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.

(continued on page 3)

COMPLETE ORDERING NUMBER.

I

SPECIFY-

1. ORDER NUMBER, TRADELINE IF DESIRED.

2. VOLTAGE AND FREQUENCY.

3. TEMPERATURE SETTING DESIRED ON L6068D.

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 DIVISION SALES OFFICE (CHECK WHITE PAGES OF PHONE DIRECTORY).

2. RESIDENTIAL DIVISION CUSTOMER SERVICE
HONEYWELL INC., 1885 DOUGLAS DRIVE NORTH
MINNEAPOLIS, MINNESOTA 55422 [phone]

(IN CANADA-HONEYWELL CONTROLS LIMITED, 740 ELLESMERE ROAD, SCARBOROUGH, ONTARIO MlP 2V9)
INTERNATIONAL SALES AND SERVICE OFFICES IN ALL PRINCIPAL CITIES OF THE WORLD.

4. FIXED OR ADJUSTABLE DIFFERENTIAL ON
L4068A,C,E,F.

5. ELEMENT INSERTION LENGTH.

6. OPTIONAL SPECIFICATIONS, IF DESIRED.

7. ACCESSORY, IF DESIRED.

Page

2

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:

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:

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.

L4068F
L6068A

L6068Da
L6068D

awith case and cover.

2-314 l-718
3-314 2-5116

3-314 2-5116
2-314 I-718

2-318
2

2
I-311 6

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

ii

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.

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.

L-

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.

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

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 temper­ature of outlet air with minimum dependence on radiant
heat. Element must not touch any internal part of the

furnace.

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.

ELEMENT TOO FAR
FROM HEAT SOURCE

ELEMENT IN AIR
FLOW AT AVERA

ELEMENT IN

FIG. I-LOCATION OF SENSING ELEMENT.

Page

3

60-2260