INSTALLATION
3.Whether vertically or horizontally, the heater should be rigidly mounted so that vibration is at a minimum since excessive vibration will result in erratic thermostat operation. The
4.By using a slotted mounting assembly on either of the lugs, the heater chamber will be permitted to expand with increas- ing temperature.
5.DANGER: Hazard of Fire. Provide minimum of 6” spacing from chamber and related piping to nearest combustible material. Avoid operation of heater near combustible fluids or in com- bustible vapor or gas laden atmosphere. NOTE: Contact factory for heaters suitable for use in hazardous locations.
6.Provide adequate space at terminal end to permit withdrawal of the heater from chamber should servicing be required.
WIRING
WARNING: Hazard of Electric Shock. Any installation involving electric heaters must be grounded to earth to eliminate shock hazard.
1.Be sure line voltage matches heater voltage (on nameplate).
2.Electric wiring to heater must be installed in accordance with local and National Electrical Codes.
3.Power controllers must be used when heaters are rated 3 phase and when the heater amperage exceeds to rating of the thermostat.
4.Refer to Wiring Diagram Table B, for the proper wiring diagram for connecting heater.
Wiring Diagrams - Table B
Model | 240V, | 240V, | 480V, | 480V, | |||||
| 1ø | Fig. | 3ø |
| Fig. | 1ø Fig. | 3 ø |
| Fig. |
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| – | 2 | – | 5 | |||||
| – | 2 | – | 5 | |||||
| – | 3 | – | 5 | |||||
| – | 3 | – | 5 | |||||
| – | 3 | – | 5 | |||||
| 1 | 2 | 4 | 5 | |||||
| – | 2 | – | 5 | |||||
| – | 2 | – | 5 | |||||
| – | 2 | – | 5 | |||||
| – | 2 | – | 5 | |||||
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Note: Use wire size and type specified by N.E.C. 480V and 550V heaters require 600V wire, per N.E.C. Contactors and wire supplied by customer.
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| Contactor |
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| 1L1 |
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| 1L2 |
| Contactor |
| 1L3 |
Contactor |
| L1 |
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Line |
| L2 | Contactor |
| L3 | ||
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| 2L1 | |
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| 2L2 |
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| 120V, 240V | 2L3 |
120V, 240V | Thermostat |
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Thermostat |
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| 120V |
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| or |
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| 240V |
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| Thermostat |
Figure 1 – NWHO | Figure 2 – NWHO6 |
| Figure 3 – NWHO6 |
240V, 1ø | 240V, 3ø |
| 240V, |
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| Contactor |
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Contactor |
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| L1 |
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Line |
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| L2 |
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| L3 | |
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| 120V, 240V |
| 120V, 240V |
| Thermostat |
| Thermostat |
Figure 4 – NWHO6 |
| Figure 5 – NWHO6 |
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480V, 1ø |
| 480V, 3ø |
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Note: Dotted lines indicate “customer furnished.” However, Thermostat could have been furnished by Chromalox if so specified on the order.
