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Overview:

Switching Action: L4079ASnap-switch. Breaks two circuits automatically on pressure rise. Each circuit must be manually reset.

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

Features:

• Stainless steel diaphragm for use with steam, air, noncombustible gases and fluids non-corrosive to stainless steel.
• L4079W is for Oil Applications.
• Micro Switch snap-acting switches open automatically on pressure rise; must be manually reset.
• Mount using 1/4 in. NPT female fitting on diaphragm assembly or surface mount through back of case.

Product Specifications:

Application: Provide limit control of steam, air, non-combustible gases or non-corrosive fluids

Dimensions (in.): 5 in. high x 4 1/2 in. wide x 3 1/2 in. deep.

Dimensions (mm): 127 mm high x 114 mm wide x 89 mm deep.

Mounting: 1/4 in. NPT internal thread or surface mount through back of case

Approvals, Underwriters Laboratories Inc.: Listed: File No. MP466, Guide No. MBPR

Approvals, Canadian Standards Association: File No. LR95329, Certificate No. 1720340

Electrical Connections: Screw terminals

Contact Ratings: 120 Vac Switch Contact– 8.0 AFL, 48.0 ALR, 10.0 A resistive; 240 Vac Switch Contact– 5.1 AFL, 30.6 ALR, 5.0 A resistive

Operating Temperature Range (F): 150 F – Maximum Ambient

Operating Temperature Range (C): 66 C – Maximum Ambient

Approvals, Swiss RE: Acceptable

Sensor Element: Stainless Steel diaphragm

Switch Operation: Manual Reset

Switching Action: SPSTbreak on pressure rise

Pipe Connection: Main or High Pressure–1/4 in. NPT internal thread

Available Models (Pressure Variations):

L4079B1033

L4079B1041

L4079B1058

L4079B1066

Operating Range (psi): 2 to 15 psi; 25 psi – Maximum Sustained

Operating Range (kPa):14 to 103 kPa; 172 kPa – Maximum Sustained

Operating Range (psi):10 to 150 psi; 225 psi – Maximum Sustained

Operating Range (kPa): 70to 1035 kPa; 1151 kPa – Maximum Sustained

Operating Range (psi):5 to 50 psi; 85 psi – Maximum Sustained

Operating Range (kPa): 35to 350 kPa; 586 kPa – Maximum Sustained

Operating Range (psi): 20 to 300 psi; 350 psi – Maximum Sustained

Operating Range (kPa): 140 to 2070 kPa; 2413 kPa – Maximum Sustained

Resources:

• Honeywell L4079 Product Data and Specifications
• Honeywell L4079Installation Manual