FEATURES
Adjustable Backcheck Positioning: An independent
valve, hex-key-operated, allows adjustment of the point, in the door's opening cycle, at
which backcheck cushioning takes effect. It provides a range of 20° within which each
backcheck can be set. The exact range is dependent upon the arm application and templated
position of the closer.
Non-Critical Valves: All control valves for
sweep/latch speed and backcheck control are non-critical and are adjusted by a standard
1/8" hex-key.
Adjusta-Power Shoe: Supplied as standard for a 15%
(±7-1/2%) power adjustment by relocating the forearm at the shoe, for all regular arm and
top jamb non-hold-open closers, only.
Narrow Profile Arm: Series 7780 closers are supplied
with a narrow profile arm for non-hold-open installations. It permits regular arm
installation where the minimum ceiling clearance is 1" (25 mm) and the reveal does
not exceed 1/8" (3 mm); it can be installed top jamb with a drop plate where the
minimum top rail of the door is 3-5/8" (92 mm) and the frame reveal does not exceed
3" (76 mm): or it can be mounted parallel arm to raise the closer body 1/2" (13
mm) higher on the top rail of the door than the standard 7700 series closer arm will
permit. Order Series 7780.
Non-Hold-Open Arm: Standard closer will be supplied
with a Non-Hold-Open arm. This arm is non-handed.
Hold-Open Arm: Closer has adjustable hold-open
feature (90° to 180°). This arm is non-handed. Order by suffixing "H" to
the Catalog Number.
Fusible-Link Hold-Open Arm: Adjustable Hold-Open Arm
(90° to 180°) available for fire door applications. The heat of a fire causes the
fusible-link to melt, and releases the door from Hold-Open. Fusible-Links have different
melting points: 125°F (52°C) is standard, 135°F (57°C) or 160°F (71 °C) are
available to order. This arm is handed, specify hand of door on the order. Order by
suffixing "HFL" to the Catalog Number.
Parallel Rigid Arm: Closer supplied with a
heavy-duty rigid forearm for applications where heavy traffic, and heavy use are
anticipated. Order by prefixing "PR" to the Catalog Number. The
Non-Hold-Open Parallel Rigid arm is non-handed. Also available in Hold-Open and
Fusible-Link Hold-Open arms, which are handed. Order by suffixing "H" or
"HFL" to the Catalog Number.
Molded Cover: Supplied as standard for all closers,
this cover is fabricated of high-impact UL listed material for covering the closer and
mounting screws. This cover is non-handed except for top jamb installations since the
shaft cutout must be factory prepared. Specify hand of door for top jamb installations.
Metal Cover: An optional cover is available with
either a plated or sprayed finish. This cover is non-handed except for top jamb
installations since the shaft cutout must be factory prepared. Order Series 7700M
closers and specify hand of door for top jamb installations.
Wood Laminated Cover: An optional metal cover that
is laminated with fine-grained domestic or imported woods. It is supplied unfinished so it
can be finished on the job with the door and frame. This cover is non-handed except for
top jamb installations since the shaft cutout must be factory prepared. Order Series
7700W closers and specify the hand of door for top jamb installations.
Special Feature Closers
Adjustable Delayed Action Closing: An optional hydraulic feature, available in place
of backcheck cushioning and backcheck positioning, that adds a third speed range to the
closing control cycle. This feature becomes effective when the door is opened and released
at any point beyond 70°. This delayed closing enables traffic to clear the opening before
the normal closing cycle starts. This feature is advantageous to the handicapped and
elderly. It is also valuable for wheeled or other traffic where delayed closing is
desirable.
Where hold-open applications are desirable, Norton
Holder-Stop or Unitrol type controls with single-point hold-open are recommended. Order
by suffixing "DA" to the Catalog No.
Telephone Booth Operation: Closer does not close
door completely; door is held ajar approximately 5° from the closed position, occupant
must close the door from this position. Available in size 2 only. See page 7700-16 for
details. Order Series 7700-TEL.
Coupon Booth Hold-Open: Closer function is designed
for application on safe deposit box inspection cubicles. Holds door open at 15° to
indicate cubicle is unoccupied. Available in sizes 2 and 3 only. For details, see page
7700-17. Order Series 7700-COUP and specify hand of door.
Hospital Hold-Open: Closer will hold door open at
approximately 15° for ventilation, 45° for observation and beyond 90° for full access.
Available in sizes 3 and 4 only. For details, see page 7700-17. Order Series 7700-HOSP
and specify hand of door. |
