Assa Abloy Corbin Russwin Access 3 Technical Manual page 8

Construction Master Keying
Construction Master Keying (Lost/Wafer Design) for AP, AS & AHS
Access 3 cylinders when master keyed are offered with the
convenience of construction keying when specified. This is not
recommended with AHS key systems or any system where strict
key control and management is enforced.
Construction keying simplifies the process when the building
gets turned over. With this feature, the construction master
keyed cylinder is master keyed with a special construction
feature in one of the chambers. The plug is prepped in two
places along both sides of the same chamber containing the
construction feature. This allows the construction master key to
be used during the construction phases.
It is highly recommended that all construction keys are collected
and accounted for once the project is complete to protect the
integrity of the key system.
Wafer
As change key rotates,
construction wafer falls into
"donut" hole in the side of plug.
Only construction wafer will
fall due to hole through its center.
This voids the construction feature.
Construction master keys are to be specified and ordered
separately.
Construction master keyed orders will have all change keys
shipped separately from hardware.
Construction master keying is not available with hotel function
cylinders or large format interchangeable cores. If construction
keying is required for LFIC, specify temporary construction
keyed cores.
Cutaway cylinder showing construction
master key being used, putting the wafer
below the shear line while key is turned.
Note the two empty "donut" holes
on either side of the chamber.
Change key rotated to
position for extraction.
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Technical Manual
Change key inserted in cylinder
putting the wafer above the shear line.
Construction key inserted after
wafer is trapped. Driver now
extends into plug chamber.
Construction key if used will not rotate.