2.3.1 Mounting the Panel
WARNING! Risk of electric shock. Can cause property damage, injury and death.
Check building plans and other relevant documents to determine whether mounting the Liebert
AC4 at the selected location might cause cutting or otherwise damaging electrical or
communication wiring or pipes.
1. Mark the wall for the cutout to accommodate the panel, using the back of the unit as a
template.
2. Drill a pilot hole for the saw blade, if required.
3. Use the saw to cut out the marked section of the wall (if not new construction).
4. Rest the Liebert AC4 in the wall and mark where mounting screws will be inserted into the wall
studs or other support member.
5. Remove the panel and drill the holes for the mounting screws or wall anchors. Clean up the
debris.
6. Reverse the slide direction of the rectangular access doors on the top and bottom of the
Liebert AC4. Leaving the doors as shipped from the factory prevents them from being opened
when the panel is flush mounted in a wall.
7. Attach any field-supplied mounting hardware.
8. Reinsert the assembly into the wall.
9. Insert and tighten the screws or wall anchors.
2.4 Connect Power to the Liebert AC4
The Liebert AC4 requires 24VAC for proper operation. Liebert recommends using the optional
Transformer Module manufactured by Liebert or another UL-approved class 2 power unit to obtain
proper voltage. If the power unit is not a class 2 circuit, it must be protected with an IEC 5x20mm time lag
2A fuse. For information, consult your local dealer, Emerson representative or the Vertiv Worldwide
Support Group.
WARNING! Risk of electric shock. Can cause property damage, injury and death.
Check that power is removed from wires prior to installation. This unit should be installed only
by properly trained and qualified personnel.
Vertiv | Liebert® AC4 User Manual | 18