DUAL-TANDEM

Dual Doors - Tandem Operation

When the outside door unlocks so will the inside door.

Used in a vestibule type application.

(learn more about access control)

Operation

1] Both doors normally locked
2] A person approaching from the outside gains access using a key
3] Turning the key unlocks both doors
4] The timer keeps both doors unlocked for the preset time
5] The person enters through both doors
6] When timer reaches zero, both doors are locked again
7] System may be shut down using key switch inside building

Items Included in Package:

• Power Supply
• Battery Backup
• Dual Control Module
• Fire Alarm Interface Module
• Timer module
• 2 Mag Locks
• 2 Filler Plates for installing mag locks
• 2 Key Switches
• 2 Push Buttons for inside of doors
• 2 Mortise Cylinders for Key Switches

This system is designed for use in vestibule applications. An entrance to a store is one example.

A typical installation would work as follows.  The timer on the power supply is set to 10 seconds.  When a person uses their key outside, the power supply immediately unlocks both doors.  The timer begins it's count down.

The person has 10 seconds to pass through both doors before they relock.  After 10 seconds, both doors lock again.

Once inside, this "first person in" can prepare to open the store.  Once preparations are complete, the interior key switch can be used to shut down the system.  Both doors then remain unlocked until the interior switch is turned again, powering up the system.  This would be done at the end of the day when the store is closed.

While the system is "on" and both doors are locked, a person may exit using the push buttons inside each door.  Only one of the buttons need be pushed to unlock both doors.  Two are supplied for safety purposes.  The inside button would normally be used to exit, but the second button is needed in case a person were trapped between the two doors.

The buttons are called "emergency exit buttons" since they have their own built-in timers.  They keep anyone from being trapped inside the building or in between the two doors.  Even a burglar that breaks in through the back door should be allowed out the front doors in case of fire.

NOTE: High security systems can be configured by substituting a few items.  An outside keypad can be installed that uses high security circuitry to prevent tampering.  The mag locks can also be beefed up to a higher holding force.