L4079A,B,W
PressureTrol® Limit Control
PRODUCT DATA
• 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.
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.
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Contents |
Application .......................................................................... |
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Features ............................................................................. |
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Specifications ..................................................................... |
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Installation .......................................................................... |
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Wiring ................................................................................. |
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Checkout ............................................................................. |
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Put UPC Code Here
60-2156—05
L4079A,B,W PRESSURETROL® LIMIT CONTROL
Models: See Table 1. |
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Electrical Ratings: |
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Pressure Ratings: See Table 1. |
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120 Vac: 9.8 Amps for full load; 58.8 |
Amps for locked rotor |
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240 Vac: 4.9 Amps for full load; 29.4 |
Amps for locked rotor |
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Table 1. Pressure Ratings. |
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Maximum Diaphragm |
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Range |
Pressure |
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Differentials |
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Model Number |
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psi |
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kPa |
psi |
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kPa |
psi |
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kPa |
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L4079Aa and L4079Bb |
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2 to 15 |
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15 to 100 |
25 |
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170 |
3 |
20.7 |
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5 to 50 |
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35 to 350 |
85 |
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590 |
10 |
68.9 |
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10 to 150 |
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70 to 1035 |
225 |
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1550 |
30 |
206.8 |
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L4079B1066b |
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20 to 300 |
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140 to 2070 |
350 |
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2410 |
60 |
413.7 |
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L4079W1000b |
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10 to 150 |
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70 to 1035 |
225 |
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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.
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3-1/2 |
4-1/2 (COVER) |
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(2-15 PSI ONLY) |
4-3/8 (CASE) |
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1- |
1-15/16 |
1-15/16 |
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13/16 |
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1/4 |
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3/16 |
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13/16 |
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3-7/8 |
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1/4 |
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4-15/16 |
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1- |
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1-13/16 |
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13/16 |
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13/16 |
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KNOCKOUT |
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KNOCKOUT |
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(2) FOR NO. |
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1- |
10 SCREW |
2-1/8 |
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FOR 1/2 INCH |
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1/16 |
1/4 - 18 NPT |
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CONDUIT (2) |
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1-1/2 |
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M22435 |
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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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