Assessments - 4, GPA: 3.8
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Although the safety of the installation is the responsibility of the user, Chromalox will be glad to make equipment recommendations. INSTALLATION WARNING: Hazard of Shock. Disconnect all power before installing heater. 1. Vertical Mounting (Preferred) — When the heater is vertically mounted, the terminal housing will be at the top of the heater. The water inlet pipe will be located on the side near the bottom of the heater and the outlet pipe at the top. The axis of the chamber will be in a vertical position as in the photo above and as in Figure A. Note: A drain pipe located at the bottom of the heater should be provided and enough room left, when mounting heater, to allow draining the heater. Incorrect Correct Figure A — Vertical Mounting © 2010 Chromalox, Inc. INSTALLATION 2. Horizontal Mounting (Optional) 3. Whether vertically or horizontally, the heater should be rigidly When mounting heater horizontally, inlet and outlet pipes mounted so that vibration is at a minimum since excessive must be up. In any other position, heater cannot be purged of vibration will result in erratic thermostat operation. The air, and elements may be seriously damaged. (See Figure B) NWH-18 is provided with mounting lugs to support the heating chamber. (See photo on previous page) 4. By using a slotted mounting assembly on either of the mounting lugs, the heater chamber will be permitted to expand with increasing 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 combustible vapor or gas laden atmospheres. 6. Provide adequate space at terminal to end permit withdrawal of the heater from chamber for servicing. Correct Incorrect Figure B — Horizontal Mounting WIRING WARNING: Hazard of Shock. Any installation Table B — Wiring Diagrams involving electric heaters must be effectively grounded in accordance with the National Electrical Code 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 Codesby a qualified person as defined in the NEC. 3. Power controllers must be used when heaters are rated for 480 volt service or if the amperage rating of the heaters exceeds the contact rating of the thermostat. 4. Refer to Wiring Diagram Table B for the proper wiring diagram for connecting heater. Heater Model 240V 3 Phase Fig. 480V 3 Phase Fig. NWH-185015 1 2 NWH-187515 1 2 NWH-1810015 1 2 NWH-1812515 1 2 NWH-1815015 1 2 NWH-1817515 1 2 NWH-1820015 1 2 Figure 1 – 240V 3-3 o Figure 2 – 480V 3-3 o Note: Dotted lines indicate “customer furnished.” However, Thermostat can be furnished by Chromalox if so specified on the order. OPERATION 1. Do not heat solutions that are corrosive to the heating element sheath or the heating chamber. WARNING: Type NWH Circulation Heaters are equipped with copper heating elements and galvanized-steel heating chambers. It is the responsibility of the user to know the chemical composition of the corrosive solution and the character of the materials entering the solution as well as the corrosive effect of the solution upon the heating elements and chamber. Chromalox cannot warrant any electric circula tion heater against failure by sheath corrosion if such failure is the result of operating conditions beyond our control. 2. Terminal ends of heater must be protected from drippings, condensation, spray or direct spill-over of material. Their presence at the terminals may damage heater electrical insulation. Liquid-tight terminal enclosures are available to protect heater. Check Factory. 3. If foreign material is carried by the liquid flow, install suitable filters in the inlet pipe line to the heater. 4. Do not allow heater to operate when liquid flow is interrupted. MAINTENANCE 1. WARNING: Hazard of Shock. Disconnect 4. Check all electrical connections periodically and retighten all power before servicing heater. connections which may have loosened in service. Replace 2. Remove heating element assembly periodically to check wire and wire terminals which show signs of oxidation which heater sheath for scaling, corrosion or excessive oxidation. would interfere with establishment of reliable electrical con- Correct operating conditions to minimize sheath deterioration. nections. 3. Periodically check temperature control and limit control operation to insure accurate and safe process operation. RENEWAL PARTS IDENTIFICATION Replacement Element Model Volts Phase kW Assembly NWH-185015 240 3 50 155-013185-046 NWH-185015 480 3 50 155-013185-047 NWH-187515 240 3 75 155-013185-049 NWH-187515 480 3 75 155-013185-050 NWH-1810015 240 3 100 155-013185-052 NWH-1810015 480 3 100 155-013185-053 NWH-1812515 240 3 125 155-013185-058 NWH-1812515 480 3 125 155-013185-059 NWH-1815015 240 3 150 155-013185-061 NWH-1815015 480 3 150 155-013185-062 NWH-1817515 240 3 175 15...