AEC ACOA Series Air-Cooled Central Chillers - Manual (Page 24)

3-7 Making Electrical Connections
Check the serial tag voltage and amperage requirements and make sure your electrical service
conforms.
Bring properly-sized power leads and ground from a fused disconnect (installed by your
electrician) to the unit. Use fuses in the disconnect switch, sized according to the National
Electrical Code recommendations listed on the electrical schematic in the control enclosure.
Caution!
Electrical connections must comply with all applicable electrical codes.
The chiller must be grounded in accordance with NEC Article 250.
Voltage must be within plus or minus ten percent (±10%) of the nameplate
rating.
Phase imbalance must be less than two percent (2%) in accordance with
NEMA MG1-14.32.
ACOA chillers must have properly sized disconnects conforming with all
local codes.
Check all wiring for damage and all terminal connections for tightness.
Shipping can loosen connections.
Use copper conductors when connecting to the ACOA terminal blocks.
3-8 Checking Motor Rotation Direction
Compressor
The compressor(s) operate(s) properly in either direction.
Condenser Fan
The condenser fan draws air through the condenser and discharges it up from the condenser.
To change fan rotation direction:
1. Disconnect and lock out power at the fused disconnect.
2. If all fans are going backwards, reverse any two main power leads.
3. If only some of the fans are going backwards, switch any two of the respective motor
leads.
ACOA Series Air-Cooled Central Chillers
Page 23