qel with cx

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You can not use these options together on the same device per the following reasons: QEL/EL device retracts the latch bolt of the exit device allowing entry. CX (Chexit) device ...
SD is Special cylinder dogging in the center case of 98/99 rim and vertical rod non fire rated devices and is available with standard, EL, QEL, CX and ALK.
You can use the QEL+ device with 900-2Q option board. The 900-2Q board is obsolete with no stock remaining.   
SD option is available and is also standard with Von Duprin 98/99 rim and vertical rod exit devices but not available with mortise device.
The 900-2RS is recommended to be used with EL devices but if you have a 900-2Q with PS914 power supply it can be used to operate up to two EL or one EL and one QEL devices .
Improper mechanical adjustment or QEL calibration could cause the QEL cycle three times with solid LED and not work. First check mechanical adjustment on vertical rods or mortise lock device and co...