I was invited to the installation of a Norton LEO™ power door operator and door operator switch onto the right hand door of a pair of doors in the main entrance of a newly constructed building. Access through these doors is controlled using Yale rim exit devices with keyed dogging, and latching...
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I was invited to the installation of a Norton LEO™ power door operator and door operator switch onto the right hand door of a pair of doors in the main entrance of a newly constructed building. Access through these doors is controlled using Yale rim exit devices with keyed dogging, and latching into a mullion. During the hours when people are moving throughout the building, the exit device will be dogged down.
The Norton LEO (low energy operator) was developed to provide opening assistance, at the same time having minimal resistance when the door is manually opened. The built-in closer body controls closing of the door. The Norton LEO meets ANSI/BHMA A156.1 (Low Energy Operators) and A156.4 (Door Closers), is UL Listed, and meets the requirements of the Americans with Disabilities Act (ADA).
The LEO consists of three basic components: the inverter, the motor, and the closer body. The motor is used to push open the door, being connected to the closer and arm with a clutch operated chain. The closer, a modified Norton 1601, controls the closing of the door. The closer has adjustable spring power, backcheck, sweep and latch. The inverter controls the operation of the motor during and when the door is open. There are six adjustments for controlling the operation of the LEO. The inverter sets the door opening speed, hold open time, obstruction detection on open, door mounting, and motor torque at hold open position. A Trimpot Adjuster is provided with the LEO.
The Norton LEO is non-handed; only the arm determines whether the unit is installed on the push or pull side of the door. For this reason, the LEO is available in two configurations. The Model 5710 is installed onto the pull side of the door and is equipped with a track arm in order to open the door. The Model 5730 for the push side of the door is equipped with a double lever arm to open the door.
For this application, a LEO 5730 was installed onto the push side of a 36-inch wide hollow metal door with closer reinforcing and metal jamb, having an the opening angle in excess of 110 degrees. 120VAC power was run to the wall above the door closer. To provide assistance in operating the LEO, a wireless door operator switch, part number 574, was installed adjacent to the door and building personnel will have access to a key fob in order to remotely open the door.
For this reason, the Norton LEO was ordered with the RF receiver factory installed. This 433MHz receiver was mounted onto the motor and would not be visible with the cover installed. The only complication for the installation was the installed weather stripping that required the power operator to be positioned approximately one-half inch beneath the jamb header.
Before installing any lock hardware, make certain the door swings freely through the entire opening and closing cycle.
To install the Norton LEO:
Step 1. Remove the existing door closer.
Step 2. Mark the locations for the center hole in the operator backplate and the first opening for the shoe using the provided template. A decision was made to permit the door to open more than 110 degrees. This located the shoe at 9-1/2" inches from the centerline of the continuous hinge, and the power operator at 13-1/4" from centerline to center mounting hole.
Step 3. Place the LEO onto the door jamb at the proper distance. Because there was weather stripping installed, the operator had to overhang the jamb.
Step 4. Position the LEO low enough that the arm does not contact the weather stripping. Mark the location for the lower right corner opening in the backplate. This first hole was chosen for the adjustability and it would provide a strong first mounting position.
Step 5. Remove the LEO, and drill and tap a hole for a #1/4-20 screw.
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To ensure the minimum opening and closing force required and to eliminate back-drive, the MPOWER 3000 drive train and motor does not activate when the door is opened manually.