A member of the Yale Security Group

SERIES 7970/7970 DPS

STANDARD FEATURES

Concealed Transom Mounting: closer mounts in header of wood, aluminum or hollow metal frames: minimum 4" (102mm) header required. (A 2" x 4" dust/grout box and a removable stop, provided by the door and frame supplier, is required.) Wood frame installation will generally require special offset templating.

Concealed Top Rail Mounted Slide Track: requires a minimum 2" (51mm) top rail depth and a 1-3/4" (44mm) minimum door thickness.

Concealed Arm: when door is closed: requires a 3/8" deep door cutout for arm clearance.

Accommodates Most Door Hanging Methods: closer can be installed on doors hung on either butt hinges, offset or center pivots. Offset and center pivots supplied by others.

Shock Absorbing Door Stop: non-hold-open closers have an adjustable position stop block. However, use of an auxiliary door stop is always recommended.

Dress Plates: supplied with all 7970 Series closers are secured to bottom of closer with TORX screws. Prevents tampering and offers streamlined appearance.

Security Fasteners: (TORX screws with security pin) furnished standard on all 7970 Series closers

Aluminum Alloy Shell: lightweight with proven durability.

Rack & Pinion Operation: assures smooth power transmission thru entire opening and closing cycles.

50% Spring Power Adjustment: power is adjustable up to 50% over minimum closing force for each closer size; spring adjustment gear assembly adjusted by a standard screwdriver.

Adjustable Closing Speed: independent regulating valve: hex-key operated.

Adjustable Latch Speed: independent regulating valve, hex-key operated.

Non-Critical Valves: all control valves are non-critical; operated by a 1/8" hex-key.

Non-Hold-Open Arm: 13" (330mm) long with offset bend to permit 180° door opening: handed.

Separate Hinges/Pivots: hinges or pivots supplied by others therefore not packaged with door closers; no early jobsite opening of closer package until closer is installed, no lost hardware.

Optional Features

790 Fire Block Door Liner: for use in 20 minute fire door assemblies where recognized by local authorities having jurisdiction.

Adjustable Delayed Action Closing: delays closing at any point beyond 70° of door opening; for handicapped or wheeled traffic.

Accessibility Code Closer: available as 7970BFI Series for interior doors, 7970BFE Series for exterior doors, with low opening resistance to conform to the requirements of ANSI A117.1 Specifications. These closers provide reduced opening forces to conform with barrier code requirements for the handicapped and still provide acceptable door control. Consult the Norton Marketing Department for application details of this closer.

Security Option 7970 DPS

Door Position Switch (DPS): this switch is Single Pole Double Throw (SPDT) momentary contact, with one (1) normally open and one (1) normally closed set of contacts. The three switch terminals are wired to the integral conduit box for connection to incoming wiring. The switch and wiring are for operation with 6 to 24 VAC/VDC systems.

Door Position Switch Adjustment: Can be made at the opening without removing the closer from the frame. The door position adjustment test socket is accessible, during installation for easy adjustment of the switch cam. Test probes from a volt meter are inserted into the test socket while using a 1/8" hex wrench to adjust the "Position Switch Adjustment".

Test Socket: Volt meter or test light may be connected to test socket to test normally open circuit or normally closed circuit at the door opening. The door position switch may be adjusted at the same time without removal of closer from door.