LiftMaster MHS Medium Duty Door Operator User Manual
IMPORTANT:
This QuickStart is intended to highlight a typical installation. These instructions are not intended to be comprehensive. Because each application is unique, it is the responsibility of the purchaser, designer, installer, and end-user to ensure that the total door system is safe for its intended use. Please consult the manual and/or a qualified technician for further information. NOTE: Intended for Professional Installation Only. Visit www.LiftMaster.com to locate a professional installing dealer in your area.
Operator Mounting
- Bracket Shelf Mounting: The operator may be mounted either above or below the door shaft. NOTE: The optimum distance between the door shaft and the operator drive shaft is between 12″ – 15″.
- Place the door sprocket on the door shaft. Do not insert the key at this time.
- Place the drive sprocket on the appropriate side of the operator. Do not insert the key or set screw at this time.
- Wrap chain drive around door sprocket and join roller chain ends together with master link.
- Raise the operator to approximate the mounting position and position the chain over the operator sprocket.
- Raise or lower the operator until the chain is taut (not tight). Make sure the operator output shaft is parallel to the door shaft and sprockets are aligned. When in position, secure the operator to the wall or mounting bracket.
- Align sprockets, insert the key into the keyway, and secure.
Continued
- Place hand chain around hand chain wheel (if provided).
- Run the power wires through the power wiring conduit hole in the electrical box enclosure. Connect the power to the operator. Connect the earth ground to the ground screw in the electrical box enclosure. Follow ALL local electrical codes.
- Run control wires through the control wiring conduit hole in the electrical box enclosure. Follow ALL local electrical codes. Adjust the limit switches to open and close the door properly.
- Adjust the limit switches to open and close the door properly. Make sure the limit nuts are positioned between the limit switches before proceeding with adjustments.
- Remove the cotter pin from the nut on the clutch shaft. Back off the clutch nut until there is very little tension on the clutch spring. Tighten the clutch nut gradually until there is just enough tension to permit the operator to move the door smoothly but allow the clutch to slip if the door is obstructed. Reinstall the cotter pin when finished.
- Troubleshooting instructions inside the cover of the operator.
QuickStartf
Because each application is unique, it is the responsibility of the purchaser, designer, installer, and end-user to ensure that the total door system is safe for its intended use. Please consult the manual and/or a qualified technician for further information. NOTE: Intended for Professional Installation Only. Visit www.LiftMaster.com to locate a professional installing dealer in your area.
A SAFETY DEVICE IS HIGHLY RECOMMENDED
Timer to Close Programming
The timer to Close feature enables the operator to close the door after a preset time, adjustable from 5 to 60 seconds. See the installation manual for LiftMaster monitored safety device selection and installation.
Timer to Close (TTC)
The timer to Close feature enables the operator to close from the open limit after a preset time, adjustable from 5 to 60 seconds. Requires LiftMaster monitored safety device.
TO PROGRAM
- Begin with the door in the fully closed position.
- Press and release the LEARN button (LED will light).
- Press and release the TTC button.
- Every press and release of the STOP button will add 5 seconds to the Timer to Close. Example: 30-second TTC = 6 presses of the STOP button.
- Press and release the TTC button to exit programming mode.
- The LED will flash once per 5 seconds of the timer setting. The TTC will become active after the completion of the next open cycle.
NOTE: The LED does not indicate that the timer is running.
TO VERIFY TIMER TO CLOSE (TTC) SETTING
- Press and release the LEARN button.
- Press and release the TTC button.
- Press and release the TTC button a second time.
- The LED will flash once per 5 seconds of the timer setting.
CLEAR TIMER TO CLOSE (TTC)
- Press and release the LEARN button (LED will light.)
- Press and hold the TTC button for 6 seconds.
- Release the TTC button (LED will go out).
The TTC will no longer be active.
Programming Remote Controls
SINGLE BUTTON REMOTE CONTROL
Built-in 315 MHz radio receiver permits as many as 20 Security ✚ ® remote controls or dip switch remote controls in any combination.
- Press and release the LEARN button (LED will light).
- Repeat steps 1 and 2 for additional remote controls.
REFERENCE LINK
https://www.liftmaster.com/mhs-hoist-operator-medium-duty-door-operator/p/MHS
