EWHB Series Industrial / Commercial Electric Unit Heater /Installation Instructions, Page 4 of 4
23-2180-83-5REZ
INSTALLATION INSTRUCTIONS
- Continued
ELECTRIC SHOCK HAZARD
Electrical installation should be made by a qualified licensed electrician. Wiring procedures, connections
and grounding shall be in accordance with the national and local codes having jurisdiction.
C. Electrical Installation:
Follow these instructions to complete the electrical installation:
1. External branch circuit protection is required. See nameplate ratings and follow Code recommendations.
2. Follow the national and local electrical and building codes related to the installation and intended use of the heater.
3. When doing any work on a heater, including the initial electrical connection, disconnect the electrical supply at the main
branch circuit switch, and lock the switch in the off (open) position. Tag the circuit "Out for Maintenance" to prevent
potential lethal shock hazards.
4. Confirm that the electrical power supply matches the nameplate voltage, phase, amperage and frequency rating of the
heater to be connected.
5. Field supply conductors must be sized for at least 125% of the circuit current. The circuit current in amps is
calculated as follows:
Single Phase Amperage = Circuit kW x 1000
Circuit Voltage
Three Phase Amperage = Circuit kW x 1000
1.732 x Circuit Voltage
6. Use copper conductors rated 90°C minimum with watertight conduit fittings.
7. Field wiring to the heater must comply with all branch circuit requirements of any national and local codes having
jurisdiction.
8. Proper installation of the heater requires that an adequate grounding conductor be connected to the ground terminal.
This terminal marked with the letter “G” and is located on the inside of the control enclosure.
9. A wiring diagram is supplied with each heater and is located on the inside surface of the control enclosure cover.
10. Check and confirm all connections are securely tightened. Remove any foreign objects from the control box and close
access door.
11. See section titled “Operating Instructions” before energizing the heater.
