Honeywell L4017 User manual

Honeywell

L-/

THE L4017 COMBINATION FAN AND

LIMIT CONTROL PROVIDES FAN AND

HIGH LIMIT SWITCHING FOR ALL TYPES

OF FORCED AIR HEATING SYSTEMS.

0 The fan switch makes and the limit switch

breaks on temperature rise.

0 The control may be used in line voltage,

low voltage, or millivolt systems.

0 The sensing element is installed directly in

the plenum duct.

v o The liquid-filled element operates indepen-

dently of changes in pressure.

0 Electrical circuits are switched by reliable

snap switches.

0 Temperature settings are adjustable.

U Fast response sensing elements.

o The sensing element may be bent away

from an obstruction if necessary.

0 Models available with a manual fan switch.

-_ I

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: MANUAL-AUTO fan switch and 10 inch [254

L4017B Combination Fan and Limit Control. mm] self-supporting element. Includes limit

MANUAL-AUTO fan switch, 60 inch [I524 stop adjusting tool.

mm] capillary sensing element. Includes limit ADDITIONAL FEATURES: Tradeline pack with

stop adjusting tool and element support bracket. cross reference label and special instruction sheet.

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 differentials-

with MANUAL-AUTO fan switch. With case and

cover.

ELECTRICAL RATING (amperes):

I FAN I LIMIT

DIA. HOLE

IN MTG SJR-

FACE FOR

DIRECT IN-

120v 240V 12QV 24QV

AC AC AC AC

Full Load 14 7 8 4

Locked Rat&. 84 42 48 24

0.25 amp at 0.25 to 12V dc (limit only).

Maximum connected load- 2000 VA.

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].

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. I-L4017A AND B DIMENSIONS, IN INCHES

[MILLIMETERS IN BRACKETS], AND LO-

CATjON OF MOUNTING HOLES.

(continued on page 3)

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:

I. YOUR LOCAL HONEYWELL RESIDENTIAL DIVISION SALES OFFICE (CHECK WHITE PAGES 0~ PHONE DlR~cT0Ryb

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 MIP 2VB)

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

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

[1371.61 (flexible capillary length). Add 6 [152.41

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.

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 l/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).

SHARP BEND

CAUSES RUPTURE

WRONG

BENDNEXTTO

JOINT CAUSES RUPTURE 2596

FIG. 2-PROPER POSITIONING OF ELEMENT.

WRONG

ELEMENT TOO FAR

FROM HEAT SOURCE

ELEMENT I

AIR FLOW ELEMENT IN

AVERAGE DEAD AIR

DISCHARGE

TEMPERATURE

ELEMENT

‘,~~$“‘“”

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. 4-USE OF ASBESTOS WASHER FOR HEAT

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).

SUPPORT ELEMENT

WITH NO. 107324A

SUPPORT

FIG. 5-CAPILLARY SUPPORT.

REPLACEMENT OF SIMILAR DEVICE BY THE

L4017

Adapter plate bag assembly, Part No. 211363, is

available to fit mounting holes of similar controls

(Fig. 6).

L4017 MTG.

I9.5) 25981\

FIG. 6-ADAPTER PLATE AND DIMENSIONS, IN

INCHES [MILLIMETERS IN BRACKETS].

WIRING

IDisconnect power supply before connecting wiring

to prevent electrical shock or equipment damage. I

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.

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.

NORMALLY l-401 7

TEMP. RISE NORMALLY

OPEN-CLOSE!

ON TEMP.

MANUALLY

ON L40178

(LINE VOLTAG

IN SERIES

WITH PRIMARY

CONTROL

CIRCUIT

POWER

FAN

MOTOR

SUPPLY

A ADD DISCONNECT MEANS AND OVERLOAD PROTECTION AS

REQUIRED. z599pi

IG. 7-CONNECTIONS TO L4017 WITH LIMIT

SWITCH IN LINE VOLTAGE CIRCUIT (JUM-

PER IN PLACE).

NORMALLY

CLOSED-

OPENS

ON TEMP. RISE NORMALLY

OPEN-CLOSES

ON TEMP.

MANUALLY

(LOW VOLTAGE)

IN SERIES

WITH PRIMARY

CONTROL

CIRCUIT

MOTOR

POWER

SUPPLY

A ADD DISCONNECT MEANS AND OVERLOAD PROTECTION AS

REQUIRED. 25008

FIG. 8-CONNECTIONS TO THE L4017 WITH LIMIT

SWITCH IN how VOLTAGE CIRCUIT (JUM-

PER REMOVED).

Page

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.

The high limit setting is provided with a stop

~IMPORTANT~

to limit the maximum temperature settmg. 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.

0 KNOCKOUT

0 CAPILLARY

0 INDICATOR INDICATOR

HIGH LIMIT FAN SWITCH

4 TERMINAL AN TERMINAL

0 STAND-OFF

0 FAN DIFF.

2601

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

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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