Emerson Liebert Prop Fan Condensing Unit Manual de instalación descargar pdf (Pagina 22)

Site Preparation and Installation

2.4.4 Electrical Connections

Each unit is shipped from the factory with internal wiring completed. Refer to electrical schematic

when making connections. Electrical connections to be made at the installation site are:

• Power supply to each ceiling unit.

• Control wiring between the evaporator unit and the condensing unit, if applicable.

• Control wiring between the control panel (wallbox) and the evaporator unit control board.

Power Connections

All power and control wiring and ground connections must be in accordance with the National Electri-

cal Code (NEC) and local codes. Refer to Unit serial tag data for electrical requirements.

Voltage supplied must agree with the voltage specified on the unit serial tag. If a field supplied dis-

connect 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. See transformer label for primary tap connections. Installer will need to

change transformer primary taps if applied unit voltage is other than pre-wired tap voltage.

An optional single point power kit is available for units that are close coupled (See 2.4.3 - Piping

Connections and Coolant Requirements). This kit should be mounted inside the condensing unit

before installing the unit in the ceiling. Specific installation instructions are included with the single

point power kit.

Control Connections

A field-supplied, 3- or 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 fac-

tory-supplied control system.

Additional control wiring will be required if your system includes other optional monitoring and con-

trol devices.

Four (4) wire (thermostat type) must be connected between the evaporator control board and the wall

box. See Figure 6.

WARNING

Unit contains hazardous electrical voltage. disconnect power supply before working within.

line side of factory disconnect remains energized when disconnect is off.

WARNING

Unit contains hazardous electrical voltage. More than one disconnect may be required to

remove power. evaporator and condensing units may have separate disconnects. Open all

disconnects before working within.

CAUTION

Use copper wiring only. Make sure that all connections are tight.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 67 68

Comentarios a estos manuales

Sin comentarios

Emerson Liebert Prop Fan Condensing Unit Manual de instalación Pagina 22

Comentarios a estos manuales

Relacionado con productos y manuales para Acondicionadores de aire del sistema de división Emerson Liebert Prop Fan Condensing Unit