Electric Latch Retraction Secures Pair of Doors

The customer wanted to re-use existing door hardware, while adding a new card reader connected to an existing access control system. An electric latch retraction upgrade for the exit bars was a key component of the plan.

Also keep in mind that the First Choice power supply outputs which connect to the solenoids are DC volts. The solenoid/module assemblies are polarity sensitive, and the output circuitry in the power supply senses the solenoids’ presence and position (connected and not energized) when you complete the connections and apply line voltage to the power supply line voltage input connections.

In order to unlock both of the bars, the input terminals in the power supply must be interconnected. Since I was using two exit devices on one opening, I had to bridge between Input 1 and Input 2 and provide a single Normally Open dry contact output from my access control device. LEDs on the power supply help you determine what’s going on if you hit a snag. It is a very robust power supply.

Since there are rare occasions when exit devices must unlock in the event of a fire alarm, the power supply is equipped with FACP (Fire Alarm Control Panel) interface terminals. If you are not connecting the power supply to a FACP, place a wire jumper across the FACP terminals in order for the power supply to work correctly.

Our door also had a First Choice removable mullion into which the two exit devices latched.


Equipment List

First Choice EL3000 Upgrade: The EL3000-1 is available as a retrofit kit for existing devices that have not been cut down from standard sizes. (Consult First Choice for more information.) Modification of the existing exit device will require some component alteration and replacement. More Info: www.firstchoicebuildingproducts.com.

PSEL3000 Power Supply: SP-1000 will operate up to two (2) 24VDC panic hardware devices simultaneously. It is designed to handle the high current surge panic hardware locking devices demand. Each lock output has an adjustable relock delay timer. It will control a pair of doors simultaneously or independently control two individual doors. It has a follower relay for each output to trigger external relays, ADA push plate switches, etc. Delayed follower relays control automatic door operators for doors that are always locked or for doors that are unlocked during the business day. In addition, two un-switched auxiliary voltage outputs are provided for powering card readers, keypads, REX PIRs, electronic timers, relays, etc. A programmable FACP interface will either provide power or remove power to the lock outputs when activated.

Marray Power Transfer Hinges: The Marray PTH (power transfer hinge) offers several advantages to the installer/customer Two of the wires are heavy 18 gauge, silver coated, high conductivity Teflon jacketed conductors and four of the wires are 28 gauge, silver coated high conductivity conductors. The two 18 awg wires can be used with electric latch retraction devices. In fact, this EL hinge was engineered for just such uses. The smaller 28 awg wires can be used for controls and switches.

According to Marray, not only is this PTH (Power Transfer Hinge) stronger and able to withstand more inrush than any other electric hinge on the market, but it has also independently tested to over 800,000 cycles on average before a wire breaks or goes to ground. (That is 8 times the UL requirement of 100,000 cycles.)

This hinge is also burn tested and UL10C listed for use on fire rated doors and frames. Marray was the first with such a listing.

Marray is the designers and trade name holder of the Perfect Raceway Program. This program allows for Certified Personnel who complete the Intertek class program, to drill fire rated doors in the field for the installation of access control locking hardware. Visit this page for more information on the Perfect Raceway Program. More Info: www.marray.com.

Door Controls International Door Closers: There were no door closers on the doors so we sold them two for these doors. We used cost effective Door Controls Premium #4000 Series closers from Door Controls International. They are ANSI A156.4 Grade 1; UL10C with lifetime warranty. More Info: www.doorcontrols.com.

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