May be used in two different ways: as an OPEN only control (all LiftMaster operators) or as an OPEN/CLOSE control (only LiftMaster operators with types B2 and S2 control wiring).
In the latter case pulling the cord will open a fully closed door close a fully opened door and reverse a closing door.
Pulling the cord whlie the door is opening will either have no effect (type B2 wiring) or will stop the door (Solid State Logic Control Board).
Air pressure is lead via a hose or pipe to a diaphragm contact. This contact converts the positive or negative pressure into an electrical contact and pulse.
Molded enclosure
Applications: commercial sectional doors rolling doors and mass transit
Works on doors up to 60ft
Can be used with standard pneumatic hose and Miller Edge extrusion
Chain spreader for installation with 1-1/4" operator shaft and 1-1/4" door shaft
Designed to keep tension on the chain when used with a wall mount commercial operator. It helps avoid premature wear on the door shaft bearing and commercial operator output shaft bearing
For use with various LiftMaster® MAXUM Series DC 700 lbs. to 2200 lbs. Standard-Duty and Extended-Duty Jackshaft Jackshaft Hoist and Trolley Commercial Door Operators
This service kit is compatible with the following MAXUM models: JDC JHDC and TDC.
NOTE: Refer to K41-0157-000 for Right-Side Cable Tension Monitor