Von Duprin offers several versions of its QEL (Quiet Electric Latch retraction) conversion kits for its 33, 35, 98 and 99 series exit devices. The variations are:
- Modular (no baseplate)
- Modular, with connectors (Molex)
- Modular with hex dogging
- Modular with hex dogging and connectors
- With baseplate, specify 3-ft. or 4-ft.
- With 3- or 4-ft. baseplate and connectors
- With 3- or 4-ft. baseplate and hex dogging
- With 3- or 4-ft. baseplate, hex dogging and connectors
None of the modular kits come with baseplates. Kits with baseplates offer a small ease-of-installation advantage because replacing the whole baseplate is slightly faster than field installing the modular kit onto an existing baseplate. Modular kits can be installed in either 3- or 4-ft. devices, so if you want to have one kit on your truck, a modular kit would be the logical choice.
Which modular kit should you get? I would suggest the HD-QEL Modular Conversion Kit with Connectors. If you don’t want hex dogging, you can use a blank cover plate or plug the dogging hole in the existing cover plate. If you don’t want the connectors, you can cut them off. And since at the time of this writing there is no price difference between a modular kit with connectors and/or hex dogging, or without connectors and/or hex dogging, you might as well get the one with all the bells and whistles. As I indicated, you can always dial it back.
While Von Duprin recommends any of their PS900 series power supplies together with their 900-2RS relay board to run their QEL devices, many installers are using their own power supplies and this seems to be working just fine. QEL draws a 1-amp inrush. I recommend allowing 2 amps for each QEL on a power supply, and it is always good to isolate them on their own set of contacts in the power supply if possible, using a power distribution or relay board. If these contacts can be protected by a fuses or circuit breakers, so much the better. A regulated and filtered power supply is also a plus.
Unlike many power supplies, I am both unregulated and unfiltered … and I like it that way.
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