Site Preparation and Installation
Liebert
®
Mini-Mate2
™
28
Power Connections
All power and control wiring and ground connections must be in accordance with the National
Electrical Code and local codes. Refer to electrical schematic on unit for electrical requirements.
Voltage supplied must agree with the voltage specified on the unit name plate. If a field-supplied
disconnect switch is required, it may be bolted to the ceiling unit but not to any of the removable
panels. This would interfere with access to the unit. Make sure that no refrigerant lines are
punctured when mounting the disconnect switch.
Route the electrical service conduit through the hole provided in the cabinet and terminate it at the
electric box. Make connections at the factory terminal block or disconnect switch, L1, L2, (L3).
Connect earth ground to lug provided. For 208VAC applications, the low voltage transformer tap
must be changed. Refer to the electrical schematic.
An optional single point power kit is available for units that are installed close-coupled. This kit
should be mounted inside the evaporator before installing the unit in the ceiling (See Figure 17).
Specific installation instructions are included with the single point power kit.
Control Connections
A field-supplied 4-wire control connection (24 VAC) is required between the evaporator and the
condensing unit. Control wiring must be installed in accordance with the National Electrical Code
(NEC) Class 2 circuit. Glycol cooled units also require a two-wire control connection to the drycooler
and pump. A Class 1 circuit is required for Water/Glycol units.
Control wiring between the evaporator and the condensing unit must not allow a voltage drop in the
line of more than 1 volt (16 gauge minimum for 75 feet). Do not connect additional electrical devices to
the control circuit. The circuit breaker, contained in the transformer housing, is sized only for the
factory-supplied control system.
Additional control wiring will be required if your system includes other optional monitoring and
control devices.
WARNING
Risk of loose electrical wiring connections. Can cause over heating of wire, smoke, and fire
resulting in building and equipment damage, serious injury or death.
Use copper wiring only. Make sure that all connections are tight.
NOTE
Refer to specifications for full load amp. and wire size amp. ratings.
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