Site Preparation and Installation
Power Connections
All power and control wiring and ground connections must be in accordance with the National Electrical Code (NEC) and local codes. Refer to Unit serial tag data for electrical requirements.
! WARNING
Risk of loose electrical wiring connections. Can cause overheating of wire, smoke and fire resulting in building and equipment damage, serious injury or death.
Use copper wiring only. Verify periodically that all connections are tight.
Voltage supplied must agree with the voltage specified on the unit serial tag. 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. See transformer label for primary tap connections. Installer will need to change transformer primary taps if applied unit voltage is other than
An optional single point power kit is available for units that are close coupled (See 5.4.3 - 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
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
Additional control wiring will be required if your system includes other optional monitoring and control devices.
Four (4) wire (thermostat type) must be connected between the evaporator control board and the wall box. See Figure 14.
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