Piping Connections; Ducting; Electrical Connections; Power Connections - Emerson Liebert InteleCool 2 User Manual

2.3

Piping Connections

The Liebert InteleCool2 is a self-contained, packaged unit. All refrigerant piping connections are
made at the factory, so no external condenser is required. The evaporator coil condensate drain is
factory-supplied and drains outdoors through the unit base pan. The condensate drain tubing should
be checked to be certain that it is placed through the hole provided in the base pan.
2.4

Ducting

Field-supplied ducting can be attached to the unit duct connection once the unit has been mounted to
the outside wall. The total external static pressure for the duct, including grille, must not exceed the
values shown in Table 5 and Table 6. Indoor discharge air rates are also given in the same tables.
2.5

Electrical Connections

WARNING
!
Risk of electric shock. Can cause injury and death.
Disconnect all local and remote electric power supplies before working within.
Use voltmeter to make sure power is turned off before making any electrical connections.
NOTE
Refer to electrical schematic when making connections.
Each unit is shipped from the factory with all internal wiring completed. Refer to the electrical
schematic when making connections. Electrical connections to be made at the installation site are:
line voltage power supply to the power input and control wiring to remote control (customer-supplied
or Emerson option). DO NOT RUN CONTROL WIRING WITH HIGH VOLTAGE.
2.5.1

Power Connections

All power and control wiring and ground connections must be in accordance with the National
Electrical Code and local codes.
Use copper wiring only. Make sure that all connections are tight.
Make sure that the voltage supplied agrees with the voltage specified on the unit nameplate. The
Liebert InteleCool2 comes standard with a factory-installed circuit breaker, accessible through an
external access panel. An external, wall-mounted power disconnect switch (field-supplied) may be
required for local codes. If necessary, this switch should be wired according to those codes.
For access to the electrical enclosure:
• Remove the screws securing the middle panel and pull the panel down and forward to remove.
• Remove the screws securing the electric box cover and remove cover.
• Verify that the unit wiring is correct for the actual input power. Some units are built with multi-
voltage serial tags. The transformer may need to be re-tapped if the actual input voltage is differ-
ent (see serial tag and electrical schematic).
Route the supply power to the customer-supplied disconnect switch (if required) and then to the unit
circuit breaker inside the unit. Route the conduit to the hole provided in the cabinet. Connect the
earth ground to the lug provided near the circuit breaker. Refer to the unit wiring diagram supplied
on the inside of the electrical enclosure cover.
NOTE
The optional three-phase scroll compressor must rotate in the correct direction to ensure proper
system operation. Wiring must be phased and connected as shown:
• PHASE "A" to T1 or L1
• PHASE "B" to T2 or L2
• PHASE "C" to T3 or L3
6
Installation