Honeywell L4079A, L4079W, L4079B User Manual

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L4079A,B,W PressureTrol® Limit Control

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 through transparent cover.

• Switches open automatically but must be reset manually.

• Trip-free reset mechanisms do not permit the limiting role of the PressureTrol jamming the reset lever.

• Control does not need leveling.

• The L4079 is unaffected by moderate vibration.

snap-acting switches are visible

Control to be defeated by

PRODUCT DATA

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

60-2156—05

L4079A,B,W PRESSURETROL® LIMIT CONTROL

3-7/8

1/4

(2-15 PSI ONLY)

KNOCKOUT FOR 1/2 INCH CONDUIT (2)

1/4

4-15/16

KNOCKOUT (2) FOR NO. 10 SCREW

1/4 - 18 NPT

1/16

M22435

2-1/8

13/16

3-1/2

1-1/2

3/16

1-13/16

4-1/2 (COVER)

4-3/8 (CASE)

1-15/16

SPECIFICATIONS

Models: See Table 1. Pressure Ratings: See Table 1.

Table 1. Pressure Ratings.

Range

Model Number

L4079A

and L4079B

psi kPa psi kPa psi kPa

2 to 15 15 to 100 25 170

5 to 50 35 to 350 85 590 10

10 to 150 70 to 1035 225 1550 30

L4079B1066

L4079W1000

Ratings apply to each of two separate circuits.

One circuit only.

20 to 300 140 to 2070 350 2410 60

10 to 150 70 to 1035 225 1550 30

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.

Electrical Ratings:

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

Maximum Diaphragm

Pressure Differentials

3 20.7

68.9

206.8

413.7

206.8

Accessories:

50024585-001 Brass Steam Trap. 14026 Steel Steam Trap. 33312B Knurled adjustment knob.

Dimensions: See Fig. 1.

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

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.

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