DO NOT place the heater behind doors. Figure 6 Horizontal discharge rod spacing Wiring Instructions CAUTION: TO AVOID ELECTRICAL SHOCK, BE SURE ELECTRICITY IS TURNED OFF AT ELECTRICAL PANEL BOARD BEFORE WIRING. ALL WIRING MUST BE DONE IN ACCORDANCE WITH LOCAL CODES AND THE HEATER MUST BE GROUNDED AS A PRECAUTION AGAINST POSSIBLE ELECTRIC SHOCK. IN ABSENCE OF LOCAL CODES, FIELD WIRING TO THE UNIT SHALL COMPLY WITH CURRENT PROVISIONS OF THE AMERICAN NATIONAL ELECTRICAL CODE OR YOUR NATIONAL ELECTRICAL CODE, AS APPLICABLE. NOTE: Connect heater only to a line with the voltage and frequency specified on the nameplate. Branch Circuit Connections (Power) 1. Wiring compartment access door is hinged. To open, turn single screw on the side until the door swings away from the heater (See Figure 9). Do not try to remove screw. 2. A knockout is provided in the back of the unit for field wiring (See Figure 9). This is a multiple diameter knockout. Use the diameter that fits the required conduit size. Hinge 3. A ground terminal is provided near the junction block for field wiring. The ground should be connected before any other connections. 4. The junction block is equipped with box terminals sized to accept the correct power supply wire. Wire rated at 600 volts and 75.C is satisfactory for branch circuit connections. Either copper or aluminum conductors may be used. NOTE: the center Power Control Access Door WiringWiring box terminal on the three pole junction block is used only for 3-phase operation. Knockout Knockout 5. Each heater has a wiring diagram on the inside of the access door. Consult this Figure 9 diagram before making any field connections. Knockout locations Turn Captive Fastener BACK Wiring Instructions CAUTION – READ THESE INSTRUCTIONS CAREFULLY WHEN USING ALUMINUM WIRING 1. Carefully strip insulation from aluminum conductors and coat ends of conductors with suitable corrosion inhibitor (“Pentrox A” or equivalent). 2. Wire brush aluminum surface, removing corrosion; re-coat with corrosion inhibitor. 3. Connect aluminum wiring and tighten connection securely. CAUTION: Do not exceed pressure needed for making a typical copper connection. 4. Coat entire connection with inhibitor. 5. All connections using aluminum conductors should be periodically re-checked for tightness. 6. NOTE: DO NOT JOIN ALUMINUM CONDUCTORS DIRECTLY TO COPPER. DUAL RATED 240/208 VOLT MODELS: All 240 volt models may be operated at 208 volts with a corresponding reduction in output. FRONT Terminal block Factory wired forsingle phasepower (linevoltage control models). Heater elements Orangewire Figure 10 Orangewire Junction block for field wiring Red wire BACK 3-Phase Connections Single or 3-phase power connections may be used on 240/208 volt, 5 KW models. These units come factory wired for single-phase power but may be wired for 3-phase power by reconnecting two wires. This is done as follows: Models with Line Voltage Control (See Figures 10 and 11) a. Disconnect the orange wir...

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