Honeywell
THE L4017 COMBINATION FAN AND
LIMIT CONTROL PROVIDES FAN AND
HIGH LIMIT SWITCHING FOR ALL TYPES
OF FORCED AIR HEATING SYSTEMS.
□ The fan switch makes and the limit switch
breaks on temperature rise.
□ The control may be used in line voltage,
low voltage, or millivolt systems.
□ The sensing element is installed directly in
the plenum duct.
FAN AND LIMIT
□ The liquid-filled element operates indepen
dently of changes in pressure.
□ Electrical circuits are switched by reliable
snap switches.
□ Temperature settings are adjustable.
O Fast response sensing elements.
□ The sensing element may be bent away
from an obstruction if necessary.
□ Models available with a manual fan switch.
H.A.
11-75 (.046)
SPECIFICATIONS
TRADELINE MODELS
Tradeline models are selected and packaged to provide ease of stocking, ease of handling, and maximum re
placement value. Tradeline model specifications are the same as those of standard models except as noted below.
L4017B Combination Fan and Limit Control.
TRADELINE MODELS AVAILABLE:
L4017B Combination Fan and Limit Control.
MANUAL-AUTO fan switch, 60 inch [1524
mm] capillary sensing element. Includes limit
stop adjusting tool and element support bracket.
STANDARD MODELS
MODELS:
L4017A Combination Fan and Limit Control. Unit
has adjustable fan-on and high limit set points with
fixed limit and adjustable fan differentials. With
case and cover.
L4017B Combination Fan and Limit Control. Unit
has adjustable fan-on and high limit set points
with fixed limit and adjustable fan differentialswith MANUAL-AUTO fan switch. With case and
cover.
ELECTRICAL RATING (amperes)
LIMIT
120 V 240V
AC
8
Full Load
Locked Rotor
120 V
AC
14
84
FAN
240V
AC
7
42 48
AC
4
24
MANUAL-AUTO fan switch and 10 inch [254
mm] self-supporting element. Includes limit
stop adjusting tool.
ADDITIONAL FEATURES: Tradeline pack with
cross reference label and special instruction sheet.
LOCATION
OF 7/8 IN.
[22.2 MM]
DIA. HOLE
IN MTG SUR
FACE FOR
DIRECT IN
SERTION .
ELEMENT^
_,J5_
'l6
[49.21
-'I-
[30.2]
.-I--''
|.¿[34.9]
[7-91-i-
[106.414-f
0.25 amp at 0.25 to 12V dc (limit only).
Maximum connected load—2000 VA.
I (14.31
MAXIMUM AMBIENT TEMPERATURE: 190 F [88 C]
at switches and 300 F [149 C] at sensing element.
LIMIT DIFFERENTIAL: Fixed at 25 F [14 C].
^8
[79.41
[7.9]
16
SWITCH ACTION: Fan switch makes at set point
(adjustable differential model) and limit switch breaks
at set point on temperature rise. Fan switch breaks at
set point on model with fixed differential on tempera
ture fall.
FIG. 1-L4017A AND B DIMENSIONS, IN INCHES
[MILLIMETERS IN BRACKETS], AND LO
CATION OF MOUNTING HOLES.
(continued on page 3}
ORDERING INFORMATION
WHEN PURCHASING REPLACEMENT AND MODERNIZATION PRODUCTS FROM YOUR TRADELINE
WHOLESALER OR YOUR DISTRIBUTOR, REFER TO THE TRADELINE CATALOG OR PRICE SHEETS FOR
COMPLETE ORDERING NUMBER.
SPECIFY- 4. OPTIONAL SPECIFICATION, IF DESIRED.
1. MODEL NUMBER, TRADELINE IF DESIRED. 5. FAHRENHEIT OR CELSIUS SCALEPLATE
2. SELF-SUPPORTING ELEMENT OR CAPILLARY. AND RANGES, IF DESIRED.
3. CAPILLARY LENGTH (CAPILLARY MODELS ONLY). 6. 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 DIVISION SALES OFFICE (CHECK WHITE PAGES OF PHONE DIRECTORY».
2. RESIDENTIAL DIVISION CUSTOMER SERVICE
HONEYWELL INC., 1885 DOUGLAS DRIVE NORTH
MINNEAPOLIS, MINNESOTA 55422 (612) 542-7500
(IN CANADA-HONEYWELL CONTROLS LIMITED, 740 ELLESMERE ROAD, SCARBOROUGH, ONTARIO M1P 2V9»
INTERNATIONAL SALES AND SERVICE OFFICES IN ALL PRINCIPAL CITIES OF THE WORLD.
_______
Page
2
LENGTH OF ELEMENT (in inches) [millimeters]:
Self-supporting model-10 [254] (total length of
element).
Capillary models-24 [609.6], 36 [914.4], and 54
[1371.6] (flexible capillary length). Add 6 [152.4]
inches for total length including sensing element.
SENSING ELEMENT: Liquid-filled.
ADJUSTMENT MEANS: Indicators are inside cover.
MOUNTING MEANS: Two holes in backplate.
DIMENSIONS: See Fig. 1.
FINISH: Gray.
UNDERWRITERS LABORATORIES INC COMPO
NENT RECOGNIZED: File No. MP466, Guide No.
MBPR-2.
CANADIAN STANDARDS ASSOCIATION CERTI
FIED: File No. LR1620, Guide No. 400-E-0.
OPTIONAL SPECIFICATION: L4017A Combination
Fan and Limit Control with fan-off scale. Unit has
fixed fan and limit differentials. Fan-on setting is
fixed at 33 F [19 C] above fan-off setting. With case
and cover.
ACCESSORY: Adapter plate bag assembly. Part No.
21136E, to match mounting holes of competitive
devices.
CAUTION
1. Installer must be a trained, experienced
serviceman.
2. Disconnect electricity before connecting wiring
to prevent electrical shock or equipment
damage.
3. Conduct a thorough checkout after the instal
lation is complete.
LOCATION
Locate the control on a solid area of the furnace
casing or jacket or on the discharge plenum. The stand
off plate furnishes a heat barrier, and a 1/4 inch
[6.4 mm] thick asbestos washer (Part No. 106638) is
provided to slip over the capillary for air seal between
the element clearance hole and the diaphragm power
head (see Fig. 4). Since the ambient temperature rating
is 190 F [88 C] at the switches, this heat barrier
should be adequate for all normal applications.
Locate element where it will be exposed to rapid
temperature changes in the furnace. After the fan
starts, the element temperature should be affected as
much as practicable by the changing temperature of
the outlet air and receive only enough radiant heat to
reduce element temperature lag. The element should
not touch any internal part of the furnace. When pro
vided use the furnace manufacturer’s recommendations
to determine the exact location (Fig. 3).
RIGHT
ELEMENT IN
AIR FLOW AT
AVERAGE
DISCHARGE
TEMPERATURE
ELEMENT TOO FAR
FROM HEAT SOURCE
WRONG
ELEMENT IN
DEAD AIR
ELEMENT
TOUCHING
HEAT
EXCHANGER
FIG. 3-PROPER AND IMPROPER LOCATIONS FOR
SENSING ELEMENT. WHEN PROVIDED, USE
THE FURNACE MANUFACTURER'S REC
OMMENDATIONS TO DETERMINE THE EX
ACT LOCATION.
FIG. 2-PROPER POSITIONING OF ELEMENT.
BARRIER.
MOUNTING
1. Make a 7/8 inch [22.2 mm] diameter hole where
the element is to be inserted.
2. Loosen the cover screw and remove the cover
from the L4017.
3. Use the control as a template to mark the location
of the 2 mounting holes (see Fig. 1).
4. Punch or drill the holes for the mounting screws.
Page
3
60-2259
5. Insert the element into the element opening and
slip the asbestos washer over the capillary (Fig. 4).
With the 2 screws provided, securely fasten the control
to the furnace casing.
6. Position the element as described in Location
above, bending as necessary. Avoid sharp bends or
repeated flexing with the self-supporting model (Fig. 2).
FLEXIBLE CAPILLARY MODEL
The element must be firmly held in position by use
of capillary support. Part No. 107324A, or similar
support (Fig. 5).
WIRING
CAUTION
Disconnect power supply before connecting wiring
to prevent electrical shock or equipment damage.
All wiring must comply with applicable local codes
and ordinances. Follow the system wiring diagrams
furnished with the burner. Figs. 7 and 8 illustrate the
connections to the L4017. For ease in wiring, 2 conduit
knockouts are furnished at the bottom, and 1 at the top
of the case.
CAUTION
A jumper is provided between the fan and the
limit terminals. This jumper is used when both the
fan and the limit switches are switching line voltage
circuits. When the high limit switch is used in the
low voltage circuit, remove this jumper.
REPLACEMENT OF SIMILAR DEVICE BY THE
L4017
Adapter plate bag assembly. Part No. 21136E, is
available to fit mounting holes of similar controls
(Fig. 6).
FIG. 7-CONNECTIONS TO L4017 WITH LIMIT
SWITCH IN LINE VOLTAGE CIRCUIT (JUM
PER IN PLACE).
NORMALLY
CLOSEDOPENS
ON TEMP. RISE
(LOW VOLTAGE)
IN SERIES
WITH PRIMARY^
CONTROL *4
CIRCUIT
NORMALLY
OPEN-CLOSES
ON TEMP.
RISE OR
MANUALLY
ON L401 78
FIG. 6-ADAPTER PLATE AND DIMENSIONS, IN
INCHES [MILLIMETERS IN BRACKETS].
ADD DISCONNECT MEANS AND OVERLOAD PROTECTION AS
REQUIRED.
FIG. 8-CONNECTIONS TO THE L4017 WITH LIMIT
SWITCH IN LOW VOLTAGE CIRCUIT (JUM
PER REMOVED).
Page
4
2600B
SETTINGS
LIMIT SETTING
To set the cutout point for the high limit switch,
move the high limit indicator (Fig. 9) to the desired set
point. Follow setting instructions furnished by the
furnace manufacturer whenever possible. The limit dif
ferential is fixed at 25 F [14 C]. The switch breaks
at the setting and remakes 25 F [14 C] below the
set point.
-IMPORTANT-
The high limit setting is provided with a stop
to limit the maximum temperature setting. Do not
force indicator above this point.
FAN SETTING (ADJUSTABLE
DIFFERENTIAL)
The fan differential is adjustable from 15 to 50 F
[8 to 28 C]. The fan switch makes at the set point and
breaks 15 to 50 F [8 to 28 C] below the fan-on
setting, depending on the position of the fan adjustment
dial. To change the setting, move the fan-on indicator
(Fig. 9) to the desired temperature. Set the fan dif
ferential adjustment dial (Fig. 9) to the desired dif
ferential. For constant fan operation (L4017B only),
set the MANUAL-AUTO switch in the manual position.
FIG. 9-L4017B WITH COVER REMOVED. L4017A
IS SIMILAR BUT DOES NOT INCLUDE
THE MANUAL FAN SWITCH.
FAN SETTING (FIXED DIFFERENTIAL)
Set the fan indicator to the desired fan-off tempera
ture. The fan will come on 35 F [19 C] above that
setting.
CHECKOUT AND TROUBLESHOOTING
CHECKOUT
1. Follow the furnace manufacturer’s instructions
for placing the furnace in operation. If a manual re
set Pilotstat control is used, make sure that it is
holding in.
2. Set the thermostat and limit control to call for
heat. The main burner should light.
3. To check the high limit control, disconnect the
fan motor and close all dampers. Set thermostat to
call for heat. Main burner should light. When plenum
temperature reaches limit control setting, main burner
should shut off. When checkout is complete, connect
fan motor and open all dampers.
4. Make sure that the fan operates when the furnace
temperature rises to the setting and shuts off when tem
perature drops below set point and through the desired
differential. On fixed differential models, the fan should
operate when furnace temperature rises to setting plus
differential and shut off when temperature drops to
setting.
OVERHEATING FURNACE (LIMIT SWITCH
FREQUENTLY CUTS OUT)
1. Make sure fan is operating by jumpering across
the fan terminals. If fan does not operate, check the
wiring.
2. Make sure that fan setting is low enough so that
the hot air is circulated from the furnace before the
plenum temperature nears the high limit setting.
3. If limit switch continues to cut out, check for
obstruction to airflow through furnace. Inspect for
clogged air filters and improperly adjusted dampers.
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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