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PN# 500-18800 Page 1
Rev. A.1, 8/01
SECURITRON MODEL MUNL-12, MUNL-24 MORTISE UNLATCH
INSTALLATION AND OPERATING INSTRUCTIONS
1. DESCRIPTION
Securitron’s Mortise UnLatch is a revolutionary new type of electric strike which eliminates the
necessity to perform a routing operation on the door frame for installation. The motor
driven Mortise UnLatch also presents a fully concealed appearance on the door which not
only enhances architectural appeal but improves security over a conventi
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Rev. A.1, 8/01 Page- 2 2.2 HOLLOW METAL (STEEL) FRAME MOUNTING Remove the existing ANSI 4 7/8” strike plate (it will be discarded) and experimentally try to fit the Mortise UnLatch in the resulting cavity. In some cases the cavity will be large enough to accommodate the Mortise UnLatch and you will have nothing to do but pull the wires up the hollow door frame and screw the Mortise UnLatch into place. In other cases you will find a “dust box” within the frame that will get in the way of
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Rev. A.1, 8/01 Page- 3 lines and knowledge of the gap between the springlatch and deadlatch pin are used to determine the vertical position of the springlatch plunger. When this gap is greater than ¼”, best reliability is obtained when the springlatch plunger position is centered on the springlatch. When the gap is smaller than ¼”, however, simply centering the springlatch plunger risks positioning the deadlatch pin too close to the springlatch plunger so the procedure is to position the
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Rev. A.1, 8/01 Page- 4 FIG. 3: ADJUSTING SPRINGLATCH POSITION Perform these adjustments with the unit on a flat surface and be careful not to lose SMALL COVER (A) the small screws A- Remove Small Cover (Small Phillips Driver) SMALL COVER SCREWS (B) B- Remove "U" Shield (5/64" Allen Wrench) SHIELD SCREWS "U" SHIELD (SOCKET HEAD CAP) Be especially careful not to let a screw or any other object fall inside the housing as it can jam the Mortise UnLatch Deadlatch Fingers D- Slide Fingers as
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Rev. A.1, 8/01 Page- 5 If the amount of slack or rattling is less than 1/16-1/8”, you have a “tight” door and the ability of the door to close and latch reliably is in question. To adjust for this, first check to see if the stop has “silencers” on it. These are cylindrical rubber bumpers which quiet the noise of a closing door but also have the effect of making the door close earlier. Remove the silencers (they pull out) and this will add slack to the closed position of the door. Be sure
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Rev. A.1, 8/01 Page- 6 FIG 5: MORTISE UNLATCH SIDE VIEW IN REST (SECURE) POSITION DEADLATCH FINGERS DEADLATCH PIN SPRINGLATCH SPRINGLATCH PLUNGER IN THE REST (SECURE) POSITION, THE SPRINGLATCH IS ALLOWED TO COME OUT BY THE SPRINGLATCH PLUNGER THEREBY SECURING THE DOOR. THE DEADLATCH FINGERS, HOWEVER, PUSH IN THE DEADLATCH PIN WHICH "FREEZES" THE SPRINGLATCH FOR BEST SECURITY. FIG 6: MORTISE UNLATCH IN OPERATION DEADLATCH PIN DEADLATCH PIN DEADLATCH DEADLATCH FINGERS FINGERS SPRING- SP
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Rev. A.1, 8/01 Page- 7 Note that if the door is heavily pre-loaded (by someone trying to pull it open before the Mortise UnLatch has released it for example), the Mortise UnLatch may not possess enough power to release the door. This is termed a stall condition for the motor. When a motor is stalled for a period of time, it can be damaged by heat build up as motors draw heavy current when they’re not permitted to move. The Mortise UnLatch automatically detects any stall condition that p
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Rev. A.1, 8/01 Page- 8 UnLatches, the extra current capability will always be there as each unit will operate at different times so each can draw extra current from the power supply when needed. If you are using a smaller capacity power source, you may be satisfied with the operation of the Mortise UnLatch since the reduction in torque is only noticeable when the door is pre- loaded. There is, however, an important electronic effect. During the brief moment while the motor is starting to
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Rev. A.1, 8/01 Page- 9 MAGNACARE LIMITED LIFETIME WARRANTY SECURITRON MAGNALOCK CORPORATION warrants that it will replace at customer’s request, at any time for any reason, products manufactured and branded by SECURITRON. SECURITRON will use its best efforts to ship a replacement product by next day air freight at no cost to the customer within 24 hours of SECURITRON’s receipt of the product from customer. If the customer has an account with SECURITRON or a valid credit card, the cust
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Rev. A.1, 8/01 Page- i APPENDIX A: TROUBLESHOOTING PROBLEM-- Unit will not operate when trigger wire is connected to +V. On a new installation, make sure that DC power (12 or 24 volts depending on the model) is connected to the red and black wires with correct polarity. When this is confirmed, note that the Mortise UnLatch will never operate unless the springlatch plunger is pushed in by the springlatch (see Section 3.3). You can be “fooled” by this feature if you’re trying to test oper
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DOTTED LINE SHOWS AREA TO CHISEL OUT 1 7/8" DEEP FOR INSTALLATION IN WOOD FRAME 4 1/8" CENTER LINE 4 7/8" Rev. A.1, 8/01 Page- ii TEMPLATE FOR CHISELING OUT A WOOD FRAME 1 1/4"
