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11 Liebert
®
AC4
™
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 5 x 20mm
time lag 2A fuse. For information, consult your local dealer, Emerson representative or the Emerson
Network Power Liebert Worldwide Support Group.
To connect electrical power:
1. Run conduit and electrical wiring from building to the Liebert AC4.
2. Use copper wires only; proper wiring to use for power is 18-22 AWG stranded and shielded
(18 AWG is recommended—see Table 4). Strip wires 1/2".
Figure 6 Electrical connections to panel
3. Secure the incoming electrical service wires to the Liebert AC4’s 24VAC input by sliding the wires
into TB7, the 24VAC input terminal block. There is no polarity requirement when connecting to
TB7. The ground wire must be connected to the earth ground terminal located on the side of the
panel (see Figure 6).
!
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.
!
CAUTION
Risk of electric shock. Can cause property damage, injury and death.
The Liebert AC4 is designed for use on properly grounded (earthed) 24VAC power, 50Hz or
60Hz. The ground wire for the power lead must be wired to the earth ground terminal (stud
located next to the 24VAC terminal block).
This equipment is intended to be installed by a qualified and certified electrician who must
review and approve customer supplied wiring and circuit breakers, verify correct input and
grounded (earthed) connections to ensure compliance with technical standards and national
and local electrical codes.
!
WARNING
Risk of electric shock. Can cause property damage, injury and death.
Be sure that the Power On/Off switch is set to OFF before installing any wiring to this unit.
The switch is in the top left corner of the unit, just below the battery pack.
24VAC input
connector
24VAC wiring
(red & white)
Power
On/Off
switch
External wiring
through knockout
Earth ground
terminal
Ground wire
(black)