 CONTROL OPTIONS
Control Options
Power Track: The 8205BC, 8305, 8405BC or
8505 door closers are the basic control component for the North Power Track
electromechanical closer-holder with single-point hold-open. For information on these
fire/smoke barrier door controls, see the Catalog Section Power Track.
Unitrol® Door Controls: The
Series 8300/8500 door closers are the basic control component for the Norton Series
UNI-8300/UNI-8500 and UNI-J8300/UNI-J8500 (top jamb) Unitrol®
Door Controls. For catalog information on these specialized shock-absorbing controls,
refer to Catalog Section Unitrol.
CloserPlus: The Series 8300/8500 door
closers are the basic control component for the Norton Series CLP-8300/CLP-8500
CloserPlus. Catalog information on these controls which offer selectable hold-open and/or
a positive stop can be found in Section CloserPlus.
Special Feature Closer
Adjustable Delayed Action Closing: An
optional hydraulic feature available in conjunction with backcheck cushioning that adds a
third speed range to the closing cycle. This feature becomes effective when the door is
opened and released at any point beyond 70°. The amount of time delay depends on the
combination of the angle of door release and valve adjustment. The valve can be adjusted
with a 1/8" hex key from no delay time up to maximum delay times of:
| Door Opened |
Approximate Time |
| and Released at |
of Delay Cycle |
| 180° |
4-5 minutes |
| 120° |
2-3 minutes |
| 90° |
25-30 seconds |
Pressure Relief Safety Valve: The
delayed action hydraulic system contains a pressure relief valve. Any time the door is
forced toward the closed direction, while it is in the closing cycle, the valve will open
and permit the door to close. This prevents damage to door, frame, and closer.
Suggested Applications: Delayed Action
closing allows slow moving traffic to clear the opening before the door closer's normal
closing cycle begins. This feature can be helpful in health care facilities such as
hospitals and nursing homes. It provides sufficient time for persons on crutches or in
wheel chairs to pass through a door without concern of it closing. At the same time it can
accommodate the facility's staff with movement of food service carts, beds and other
wheeled traffic.
Use of delayed action closers on many doors through
industrial and commercial buildings can also assist the flow of traffic. Locations where
additional time to clear the opening are advantageous are doors to computer rooms, doors
between office and factory/warehouse facilities, doors to workshops and to laboratories,
to kitchen and food processing areas ... to list just a few.
|
