SUPER TRADELINE L4064B
Universal Combination Fan and Limit Controllers
APPLICATION
The L4064B controls the on and off operation of the
heating unit’s fan motor and provides high limit control
of the main burner. It is suitable for all types of forced
air heating systems.
The L4064B’s bimetal sensing element turns fan on
and off according to plenum temperature.
The L4064B has a manual switch to provide
continuous fan operation, mounting adapters for
replacing competitive devices, adapters for wiring
convenience, and a strain relief bushing for protecting
the wiring from damage due to field abuse.
Limit contacts are suitable for line voltage, low
voltage or millivoltage circuits.
The fan-on timing can vary depending on applied
voltage and switch ambient.
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.
Failure to remove brass jumper, if limit switch is
in low voltage circuit, can cause electrical shock
hazard or damage low voltage controls.
1. Disconnect power supply before connecting
wiring to prevent electrical shock or equipment
damage.
2. When connecting cable or conduit to control,
avoid straining the control case.
Follow furnace or burner manufacturer’s
instructions, if available. The L4064B has a
maximum switch temperature of 190
O
F (88
O
C),
maximum element temperature of 350
O
F (177
O
C).
Do not exceed these temperatures or the following
electrical ratings (amperes):
Pilot Duty: 2 A at 24 Vac; 0.25 A at 0.25 to 12 Vdc.
Maximum Combined Connected Load: 2000 VA.
75
O
C (167
O
F) (min.) field wiring required. Wiring must
conform to NEC Class 1 requirements.
!
WARNING
!
CAUTION
120 Vac
240 Vac
FAN
LIMIT
LIMIT
FAN
14
84
8
48
7
4
42
54
Full Load
Locked Rotor
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN, 55422
www.honeywell.com/building/components
07/06 RB
© Honeywell 2006 Printed in Canada
69-0117-3
Fig. 9 - A: Limit in low voltage circuit.
B: Limit in line voltage circuit.
C: Limit in line voltage circuit without jumper.
the fan contacts (at the FAN ON temperature setting).
During normal operation, the call for heat end before
the LIMIT setting is reached, and the fan contacts break
as the plenum temperature falls and the FAN OFF
setting is reached.
If the call for heat continues until the temperature in
the plenum rises to the LIMIT setting, the bimetal
element will mechanically break the limit contacts and
de-energize the gas control circuit.
CHECKOUT
When installation is complete, disconnect the fan
motor circuit at the L4064. Turn on power and set
thermostat to call for heat. Burner should come on and
limit controller should shut burner off when plenum
temperature reaches the limit set point. Turn off power,
recconnect the fan switch, turn on power and again set
thermostat to call for heat. Fan should come on when
plenum temperature has reached fan-on setting.
Fig. 10 - Changing the high limit stop.
SETTINGS AND ADJUSTMENTS
FAN SETTING ADJUSTMENT
1. Move the FAN OFF lever to the temperature at
which the fan is to stop to prevent circulation of cool
air.
2. L4064B - Move the FAN ON lever to the
temperature at which the fan is to come on.
MANUAL FAN SWITCH
For constant fan operation, push the FAN switch
button in. For fan to cycle automatically, pull button
out.
LIMIT SETTING ADJUSTMENT
These controllers have a limit stop which prevents
the limit indicator lever from being adjusted beyond
the equipment manufacturer’s specifications.
1. Push the small end of Limit Adjust Tool
(196722) through hole in scaleplate (located at
caution marking) to depress the stop disc not more
than 1/16 in. (1.6 mm) to release stop lock (Fig. 10).
Stop disc is on back of scaleplate.
2. While depressing the stop disc, insert the long
end of Limit Adjust Tool next to limit stop (Fig. 10)
and move the stop to desired setting.
If the L4064 is
a replacement control, high limit stop setting should
be the same as that of the control being replaced.
(Move stop clockwise to lower the setting,
counterclockwise to raise it.) Then remove the
limit stop adjust tool.
3. Set the LIMIT OFF lever to the temperature at
which the high limit switch is to open to stop the
burner. If the high limit stop has been properly set,
the LIMIT OFF lever should be as high as the stop
permits.
OPERATION
As the plenum temperature rises, the bimetal sensing
element of the control wraps and mechanically makes
When adjusting the fan and limit set point levers
(Fig. 10), hold the scalepale dial to keep it from turning
and straining the sensing element.
Move each indicator lever to the control point
recommended by the burner or furnace manufacturer.
Use gentle finger pressure.
L4064
L4064
B
A
C
FAN
SIDE
FAN
SIDE
LIMIT
SIDE
LIMIT
SIDE
JUMPER
REMOVED
JUMPER IN
PLACE
POWER
SUPPLY
POWER
SUPPLY
FAN
MOTOR
FAN
MOTOR
1
2
2
1
1
3
3
L1
L1
L2
L2
ADD DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED
TO CONTROL LOW VOLTAGE EQUIPMENT
TO CONTROL LINE VOLTAGE
FAN
MOTOR
FAN
SIDE
LIMIT
SIDE
L1
L2
POWER
SUPPLY
1
(HOT)
(HOT)
(HOT)
120V
JUMPER
REMOVED
L4064
24V
2
HEATING SYSTEM
TRANSFORMER
11,221
PRODUCT DATA
!
CAUTION
LOCATION
If this is a replacement installation, locate the
L4064 in the same location as the control being
replaced. Sensing tube length should be same as
old control. If this is a new installation, the element
should be installed only by a trained, experienced
service technician according to the furnace
manufacturer’s instructions. The element must not
touch any internal part of the furnace.
The electrical rating is at maximum switch
temperature of 190
O
F (88
O
C). If plenum surface
temperature exceeds 190
O
F (88
O
C), heat
insulating material or a mounting bracket must be
used.
MOUNTING
The device may be mounted either on the
plenum surface or with a bracket (rigid or swivel).
SURFACE MOUNTING
Hole in plenum should be just large enough to
accommodate the 3/4 in. (19.1 mm) diameter
element tube, Fig. 1. For adequate clearance, a
13/16 in. (20.6 mm) diameter hole is
reccomended.
1. Remove cover by squeezing sides and
pulling off. Insert element in plenum and mark
location of mounting holes. Make sure the case is
snug against the plenum before marking the
mounting screws.
2. Punch or drill holes for mounting screws.
3. Place insulation between plenum and case if
necessary.
4. Fasten controller securely with mounting
screws.
Fig. 1 - Surface mounting requires a hole 13/16
in. (20.6 mm) diameter for element insertion.
NOTE:
50
100
150
200
250
ON
FAN
OFF
FAN
OFF
DO NOT ROTATE - HOLD DIAL
WHEN SETTING POINTERS
CAUTION
1
1
HOMEOWNER: THIS IS A "SAFETY STOP". DO NOT ALTER
2704E
FAN OFF SET
POINT LEVER
FAN ON SET
POINT LEVER
SCALEPLATE
TO RELEASE STOP,
PRESS STIFF WIRE
IN HOLE
ADJUSTABLE
LIMIT STOP
LIMIT SET POINT LEVER
(FACTORY-SET AT 200
O
F
(93
O
C)
LIMIT STOP
TOOL
ADD HEAT
INSULATING
MATERIAL IF
NEEDED
FURNACE
PLENUM
11,219
