About this item
The LCN 4642 is the push-side, top-jamb-mounted version of the 4640 Series Auto Equalizer, LCN's electrically powered low-energy electrohydraulic door operator. It's specified on commercial doors that need automatic powered opening for ADA accessibility but primarily serve as manual-operation doors the rest of the time. If you've been searching for "lcn 4642," "4642 auto operator," or "4642 wms 120 vac," this is the product. The WMS designation means the unit ships standard with wood and machine screws for the most common mounting substrate combinations.
What "Electrohydraulic" Means and Why It Matters
The 4640 Series operates using an electric motor that powers a hydraulic mechanism to drive the door arm. This is a different operating technology from LCN's electromechanical Senior Swing Series (9500 Series), which uses a direct motor gearbox. The hydraulic drive gives the 4642 smooth, controlled door movement through a cast iron body with a 1/2" diameter piston and a 3/4" diameter double heat-treated pinion journal. The No Destruct drive system protects the hydraulic mechanism from damage when the door encounters an obstruction mid-swing or is pushed past its intended travel. This is a standard feature on all 4640 Series units.
Push Side vs Pull Side: 4642 vs 4641
The last digit of the model number identifies the mounting side. The 4641 is pull-side (hinge side from outside). The 4642 is push side, mounting on the top jamb on the push face of the door. If you're standing outside and need to push the door to open it, the 4642 is the right choice. If the door opens by pulling it toward you, then you should go with the 4641.
Door Capacity and Opening
The 4642 handles doors from 36" to 54" wide and weighs up to 250 lbs. Non-sized cylinders can be easily adjusted to suit spring sizes 1 through 4, making them versatile for a range of applications. They work well for interior doors up to 4'6" wide and exterior doors up to 3'6" wide, providing reliable performance and flexibility for different door setups. The powered swing is 90 degrees. Manual swing capability goes up to 170 degrees (100 degrees at maximum reveal). The unit is non-handed and installed on either a right-hand or left-hand swinging door without requiring a different model.
Voltage and What "WMS 120 VAC" Means
Standard voltage is 120V AC, which is the building power standard for commercial interiors in North America. WMS designates the standard fastener pack included with the unit: wood and machine screws for both wood and hollow metal mounting conditions. When you see "4642 wms 120 vac" as a search query or spec reference, it describes the standard production unit at 120V with the standard fastener pack. No separate power supply conversion is needed for standard commercial power.
Control Module and Features
The 4640 Series control module is built into the operator assembly and provides on-board power supply with factory default memory. Accessible switches on the unit provide on/off control and a continuous hold-open mode. Opening time and force are variable by adjustments to the control module, and the module also handles electric strike control signals and sequential door function timing. Maximum hold-open time is adjustable up to approximately five minutes. The 4640CS option provides a concealed on/off power switch for applications where the visible switch is not appropriate. An optional 8310-806K key switch is available when the CS option is selected.
Certifications and Warranty
ANSI/BHMA A156.19 certified. ANSI A117.1 accessible buildings compliant. ADA compliant in power mode. UL and cUL listed. UL 10C fire door listed. 100-hour salt spray rated. Buy America Act (BAA) compliant, which matters for federal and state government projects. The 4640 Series is backed by a 2-year limited warranty.
Trusted Since 2001
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