Honeywell L4079A, L4079W, L4079B User Manual

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Honeywell L4079A, L4079W, L4079B User Manual

L4079A,B,W

PressureTrol® Limit Control

PRODUCT DATA

FEATURES

• L4079A has two ganged spst switches; breaks two circuits (may be both sides of the power supply) simultaneously.

• L4079B has one spst switch.

• L4079W is the same as L4079B but has seals for oil applications.

• MICRO SWITCH® snap-acting switches are visible through transparent cover.

• Switches open automatically but must be reset manually.

• Trip-free reset mechanisms do not permit the limiting role of the PressureTrol® Control to be defeated by jamming the reset lever.

• Control does not need leveling.

• The L4079 is unaffected by moderate vibration.

APPLICATION

The L4079A,B, and W PressureTrol® Limit Controls are high pressure limit switches that break electrical circuits when pressure rises to a preset value.

The L4079A and B can be used with steam, air, noncombustible gases, and fluids noncorrosive to the sensing element.

L4079W is for use on oil burner systems.

 

Contents

Application ..........................................................................

1

Features .............................................................................

1

Specifications .....................................................................

2

Installation ..........................................................................

3

Wiring .................................................................................

3

Checkout .............................................................................

4

Put UPC Code Here

60-2156—05

L4079A,B,W PRESSURETROL® LIMIT CONTROL

SPECIFICATIONS

Models: See Table 1.

 

 

 

Electrical Ratings:

 

 

 

 

Pressure Ratings: See Table 1.

 

 

 

120 Vac: 9.8 Amps for full load; 58.8

Amps for locked rotor

 

 

 

 

 

240 Vac: 4.9 Amps for full load; 29.4

Amps for locked rotor

 

 

 

 

Table 1. Pressure Ratings.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Maximum Diaphragm

 

 

 

 

 

 

Range

Pressure

 

Differentials

 

 

 

 

 

 

 

 

 

 

 

Model Number

 

psi

 

kPa

psi

 

kPa

psi

 

kPa

 

 

 

 

 

 

 

 

 

 

L4079Aa and L4079Bb

 

2 to 15

 

15 to 100

25

 

170

3

20.7

 

 

5 to 50

 

35 to 350

85

 

590

10

68.9

 

 

 

 

 

 

 

 

 

 

 

 

10 to 150

 

70 to 1035

225

 

1550

30

206.8

 

 

 

 

 

 

 

 

 

 

L4079B1066b

 

20 to 300

 

140 to 2070

350

 

2410

60

413.7

L4079W1000b

 

10 to 150

 

70 to 1035

225

 

1550

30

206.8

aRatings apply to each of two separate circuits.

bOne circuit only.

Switching Action:

L4079A—Snap-switch. Breaks two circuits automatically on pressure rise. Each circuit must be manually reset.

L4079B,W—Snap-switch. Breaks one circuit automatically on pressure rise. Circuit must be manually reset.

Adjustment means: External adjustment screw. Scale is calibrated in psi and kPa.

Maximum Ambient Temperature: 150°F (66°C).

Mounting Means:

Pipe fitting—1/4-18 NPT. Connection on diaphragm assembly. These devices may be either boiler mounted directly to a boiler fitting, or may be surface mounted, such as on a wall, by using the knockouts in the case.

Approvals:

Underwriters Laboratories Inc. (UL) Listed: File No. MP466,

Guide No. MBPR.

Canadian Standards Association (CSA): File No. LR95329,

Certificate No. 1720340

Accessories:

50024585-001 Brass Steam Trap.

14026 Steel Steam Trap.

33312B Knurled adjustment knob.

Dimensions: See Fig. 1.

 

3-1/2

4-1/2 (COVER)

(2-15 PSI ONLY)

4-3/8 (CASE)

 

 

 

1-

1-15/16

1-15/16

 

13/16

 

 

 

1/4

 

 

3/16

 

 

 

 

 

13/16

 

3-7/8

 

1/4

 

 

 

 

 

 

4-15/16

 

1-

 

1-13/16

 

13/16

 

 

 

 

 

 

 

13/16

 

 

 

KNOCKOUT

 

KNOCKOUT

 

(2) FOR NO.

 

1-

10 SCREW

2-1/8

FOR 1/2 INCH

 

 

1/16

1/4 - 18 NPT

 

CONDUIT (2)

 

1-1/2

 

 

M22435

 

 

 

 

 

Fig. 1. L4079A,B,W PressureTrol® Limit Control

dimensions in inches.

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number. 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 Environmental and Combustion Controls Sales Office (check white pages of your phone directory).

2.Honeywell Customer Care 1885 Douglas Drive North

Minneapolis, Minnesota 55422-4386

3.http://customer.honeywell.com or http://customer.honeywell.ca

International Sales and Service Offices in all principal cities of the world. Manufacturing in Belgium, Canada, China, Czech Republic, Germany, Hungary, Italy, Mexico, Netherlands, United Kingdom, and United States.

60-2156—05

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