LiftMaster MHS Medium Duty Door Operator User Manual
- June 13, 2024
- LiftMaster
Table of Contents
QuickStart model MJ/MH/MHS
Medium Duty Logic
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.
A SAFETY DEVICE IS HIGHLY RECOMMENDED
Operator Mounting
(1a) Wall Mount: The operator should generally be installed below the door shaft, and as close to the door as possible.
(1b) Bracket Shelf Mounting: The operator may be mounted either above or below the door shaft.
NOTE: The optimum distance between the door shaft and operator drive shaft is between 12″ – 15″.
(2) Place door sprocket on the door shaft. Do not insert the key at this time.
(3) Place drive sprocket on the appropriate side of the operator. Do not insert the key or set screw at this time.
(4) Wrap chain drive around door sprocket and join roller chain ends together with master link.
(5) Raise operator to approximate mounting position and position chain over operator sprocket.
(6) Raise or lower operator until the chain is taut (not tight). Make sure the operator output shaft is parallel to door shaft and sprockets are aligned. When in position, secure the operator to wall or mounting bracket.
(7) Align sprockets, insert key into keyway, and secure.
(8) Place hand chain around hand chain wheel (if provided).
(9) 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.
(10) Run control wires through the control wiring conduit hole in the electrical box enclosure. Follow ALL local electrical codes.
(11) Adjust the limit switches to open and close door properly. Make sure the limit nuts are positioned between the limit switches before proceeding with adjustments.
(12) Remove cotter pin from nut on the clutch shaft. Back off clutch nut until there is very little tension on the clutch spring. Tighten clutch nut gradually until there is just enough tension to permit the operator to move the door smoothly but to allow the clutch to slip if the door is obstructed. Reinstall cotter pin when finished.
(13) Troubleshooting instructions inside cover of operator.
(1a) Right Hand Wall Mounted Operator
- Optimum Distance
12-15″
(1b) Bracket Shelf Mounted Operator
OPTIONAL
Mounting Bracket
P/N 08-9098
- Optimum Distance
12-15″
(7) Align Sprockets
- Be sure door sprocket is properly aligned with drive before securing to the shaft.
- Chain Retaining Bracket (4′ above floor)
Manual Operation
MODEL MH
These operators are equipped with a manual hoist. An electrical interlock
will disable the electrical controls when the hoist is used. To operate the
hoist. Turn off power to the operator BEFORE manually operating your door.
(a) Pull the disconnect chain (sash chain) to engage the hoist mechanism. The disconnect chain may be locked in position by slipping the end through the keyhole of the chain retaining bracket mounted on the wall.
(b) Operate the door in the desired direction by pulling on one side or the other of the continuous loop hoist chain.
(c) The disconnect chain must be released from the chain retaining bracket before the door will operate again electrically.
MODEL MJ
This operator has a floor level disconnect chain to disconnect the door
from the door operator.
[a] To disengage, pull the chain and secure in the disengaged position by slipping the end through the keyhole bracket mounted on the wall. Or if emergency egress device is used, pull handle to disengage operator from door.
[b] The door may now be pushed up or pulled down manually.
[c] Release the disconnect chain or reset the emergency egress device to operate the door again electronically.
MODEL MHS
This operator includes two methods of manual operation:
a A disconnect sash chain for push-up/pull-down operation. Refer to Model MJ instructions above.
b A hoist engagement sash chain for manual hoist operation. This chain can be found on the clutch side of the operator. Refer to Model MH instructions above.
When operator is disconnected by the manual operation chain, hoist and electrical operation will not function.
(a) Electrical Interlock with Hoist
Turn off power to the operator BEFORE manually operating your door.
(b) Manual Disconnect
- Keyhole Bracket
QuickStart for the model MJ/MH/MHS door operator
01-34211B
- (11) Limit Switches
- Direction Limit Nut Will Move During Travel
- (9) Power Wiring Knockout
- (9) 115 V PH. 1 Power Connection
- Power Wiring ONLY!
- 14 AWG Minimum
- Follow ALL local electrical codes
- Control Wiring Knockouts (10)
- LiftMaster® CPS Safety Sensors
Timer to Close Programming
Timer to Close feature enables the operator to close the door after a preset time, adjustable from 5 to 60 seconds. A LiftMaster monitored safety device must be connected and unobstructed to activate this feature. See installation manual for LiftMaster monitored safety device selection and installation.
Timer to Close (TTC)
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.
- Timer To Close Button
- Electrical Box
- Logic Board
TO PROGRAM
-
Begin with door in 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 timer setting.
The TTC will become active after completion of the next open cycle.
NOTE: The LED does not indicate that 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 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.
TIMER DEFEAT
The TTC can be temporarily disabled by pressing a STOP button.
TTC will become enabled after the next open command.
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.
TO PROGRAM
-
Press and release the LEARN button (LED will light).
-
Press and hold the button on the remote control until the LED flashes rapidly, then release to complete programming (LED will go out).
-
Repeat steps 1 and 2 for additional remote controls.
-
Electrical Box
-
Logic Board
3-BUTTON REMOTE CONTROL TO OPERATE
AS A WIRELESS 3-BUTTON CONTROL STATION
NOTE: The feature will use 3 of the 20 memory channels in the operator.
TO PROGRAM
-
Press and hold the LEARN button (LED will light).
-
Press the desired button on the logic board (OPEN, CLOSE or STOP). Release both buttons.
-
Press and hold the desired button of the remote control until LED flashes rapidly, then release.
-
Repeat steps 1 through 3 to program additional buttons.
-
Open
-
Close
-
Stop
TO ERASE ALL REMOTE CONTROLS
Press and hold the LEARN button (over 5 seconds) until the LED goes out.
All programmed remote controls will be erased.
© 2008, The Chamberlain Group Inc.
All Rights Reserved
References
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