ELECTRICAL CONNECTIONS
WARNING:
To avoid electric shock, personal injury,or death,turn off the electric poweratthedisconnectorthemain service panel before making any electrical connections.
•Electrical connections must be in compliance with all applicable local codes and ordinances, and with the current revision of the National Electric Code (ANSI/NFPA 70).
•For Canadian installations the electrical connections and grounding shall comply with the current Canadian Electrical Code (CSA C22.1 and/or local codes).
Pre-Electrical Checklist:
√Verify that the voltage, frequency, and phase of the supply source match the specifi cations on the unit rating plate.
√Verify that the service provided by the utility is sufficient to handle the additional load imposed by this equipment. refer to the unit wiring label for proper high and low voltage wiring.
√Verify factory wiring is in accordance with the unit wiring diagram (Figures 15 - 16, pages 18 - 19). Inspect for loose connections.
Line Voltage
•It is recommended that the line voltage to the unit be supplied from a dedicated branch circuit containing the correct fuse or circuit breaker for the unit.
•An electrical disconnect must be located within sight of and readily accessible to the unit.This switch shall be capable of electrically
•Provide power supply for the unit in accordance with the unit wiring diagram, and the unit rating plate.
•Connect the
•Use only copper wire for the line voltage power supply to this unit. Use proper code agency listed conduit and a conduit connector for connecting the supply wires to the unit. Use of rain tight conduit is recommended.
•See the unit wiring label for proper high and low voltage wiring.Make all electrical connections in accordance with all applicable codes and ordinances.
CAUTION:
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.Verify proper operation after servicing.
•Units are shipped from the factory wired for 240 volt transformer operation.For 208V operation, remove the lead from the transformer terminal marked 240V and connect it to the terminal marked 208V.
Grounding
WARNING:
The unit cabinet must have an uninterrupted or unbroken electrical ground to minimize personal injury if an electrical fault should occur. Do not use gas piping as an electrical ground!
This unit must be electrically grounded in accordance with local codes or, in the absence of local codes, with the National Electrical Code (ANSI/NFPA 70) or the CSA C22.1 Electrical Code. Use the grounding lug provided in the control box for grounding the unit.
High Voltage |
Low Voltage |
Figure 8. Power Entry
8