 A member of the Yale Security Group
7900 FEATURES
Aluminum Alloy Shell: Series 7900 closer
bodies are constructed of a special aluminum alloy, carefully selected to accommodate
individual closer characteristics and operating conditions.
Rack & Pinion Operation: Provides a
smooth transmission of power for control of the door through its full opening and closing
cycle.
50% Power Adjustment: Power can be
adjusted by 50% over the minimum closing force for each size of closer by rotating the
spring adjustment gear assembly with a standard blade screwdriver.
Adjustable Sweep Speed: An independent
regulating valve, hex-key-operated permits adjustment of the general closing speed.
Adjustable Latch Speed: An independent
regulating valve, hex-key-operated, permits adjustment of the door's speed for
approximately the last 5° of the closing cycle.
Adjustable Backcheck Cushioning: An
independent regulating valve, hex-key-operated, provides an adjustable hydraulic cushion
to the door opening speed toward the end of the opening cycle.
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 backcheck can be set.
Non-Critical Valves: All control valves
for sweep/latch speed, backcheck control and delayed action closing are non-critical and
are adjusted by a standard 1/8" hex-key.
Non-Hold-Open Arm: This arm is 13"
(330mm) long with an offset bend to permit door openings to 180°. This arm is handed.
Hold-Open Arm: This is a straight arm,
16" (406mm) long. This arm is non-handed.
Separate Hinges/Pivots: Door is hung with
Butt Hinges, 3/4" Offset Pivots or Center Pivots furnished by others. There is no
need to open the door closer packaging to supply the hinges/ pivots to the job or the door
supplier. This eliminates problems with coordination of the hardware with other trades and
reduces the probability of lost hardware. |
