What does "Hold Back" function mean?

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Install the pinion cam at the top of the retractor per Figure 7-3 in Step 7 of 1690 Instructions.
The device is not available with cylinder dogging, but the outside cylinder assembly on the pull side of the door can be set for a hold back function (instead of nightlatch function), which essenti...
NL, Hold Back Function (BHMA Exit Function)
The 179CA cylinder assembly contains the parts that need to be put in the exit device to convert it from EO to NL (nightlatch) or HB (hold back) function.
If a 4600 clicks, but won't open the door: Verify proper connection of all the control box connectors. Verify correct manual operation of door. Verify actuator connections and any strike/maglo...