SERIES 8301/8501
CONTROL OPTIONS
Control Options
Norton Unitrol® Door Controls
The Series 8301 and Series 8501 door closer is the basic
control component of the Norton Series UNI-8301 and Series UNI-8501 parallel arm Unitrol
and the Series UNI-J8301 and Series UNI-J8501 top jamb Unitrol Door Control.
This unique control integrates a door closer, a shock
absorber, and an overhead heavy-duty door stop, with or without hold-open feature, into a
single door control.
For complete details see the Unitrol Door Control Section.
Norton CloserPlus™ Door Controls
The Series 8301 and Series 8501 door closer is the basic
control component for the Norton Series CLP-8301 and Series CLP-8501 CloserPlus Door
Control. This control integrates a door closer with a heavy-duty arm assembly and a
positive door stop. A manual engage/disengage hold-open feature is optional.
For complete details see the CloserPlus Door Control
Section.
Special Feature Closer
 Adjustable
Delayed Action Closing: An optional hydraulic feature 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 within the delay range of:
| Door Opened and Released at |
Approximate Time 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. Anytime 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 throughout
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. |
