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Anleitung Zusammenfassung
12 23 41-3/4 30 11-3/8 NWHO-61515 240 or 480 3 . 15 23 48-3/4 37 14-1/8 NWHO-62015 240 or 480 3 . 20 23 60-1/4 48-1/2 20-5/8 NWHO-62515 240 or 480 3 . 25 23 73-5/8 61-7/8 27-5/16 NWHO-63015 240 or 480 3 . 30 23 86-5/8 74-7/8 33-7/8 Fuel Oil Heaters NWHO-60825 240 or 480 1 or 3 . 8 15 41-3/4 30 11-3/8 NWHO-61025 240 or 480 3 . 10 15 48-3/4 37 14-1/8 NWHO-61225 240 or 480 3 . 12 15 60-1/4 48-1/2 20-5/8 NWHO-61525 240 or 480 3 . 15 15 73-5/8 61-7/8 27-5/16 NWHO-61825 240 or 480 3 . 18 15 86-5/8 74-7/8 33-7/8 GENERAL The NWHO-6 series is a general-purpose regular and fuel oil solution circulation heater intended for use indoors. It is designed for 150 psig at 550°F per ANSI standards. The 6 steel-sheathed tubular elements are centered in a 5” diameter galvanized steel heating chamber and welded to a removable galvanized steel flange. The assembly is surrounded by 1-1/2” insulation and sheet metal jacket. Depending upon the order specifications, the NWHO-6 may or may not be factory equipped with an AR or other Chromalox thermostat. (Note: UL listed models are factory pre-set with a 212°F limit stop.) Such thermostats function to control outlet temperatures and to limit internal temperatures under abnormal flow conditions. These controls do not fail safe. WARNING: Users should install adequate back-up controls and safety devices with their electric heating equipment. Where the consequences of failure may be severe, back-up controls are essential. Although the safety of the installation is the responsibility of the user, Chromalox will be glad to make equipment recommendations. INSTALLATION Caution: Hazard of Electric 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 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. 2. Horizontal Mounting (Optional) — When mounting heater horizontally, inlet and outlet pipes must be up. In any other position, heater cannot be purged of air, and elements may be seriously damaged. (See Figure B.) Incorrect Correct Figure A — Vertical Mounting Correct Incorrect Figure B — Horizontal Mounting © 2010 Chromalox, Inc. 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 NWHO-6 is provided with mounting lugs to support the heating chamber. (See photo.) 4. By using a slotted mounting assembly on either of the 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 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, 1o Fig. 240V, 3o Fig. 480V, 1o Fig. 480V, 3 o Fig. NWHO-61215 – 2 – 5 NWHO-61515 – 2 – 5 NWHO-62015 – 3 – 5 NWHO-62515 – 3 – 5 NWHO-63015 – 3 – 5 NWHO-60825 1 2 4 5 NWHO-61025 – 2 – 5 NWHO-61225 – 2 – 5 NWHO-61525 – 2 – 5 NWHO-61825 – 2 – 5 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. ThermostatLineContactor120V, 240V ContactorThermostatL1L3L2120V, 240V ContactorContactorThermostat1L11L21L32L12L22L3120V or240VFigure 3 – NWHO6 240V, 2-3o Figure 2 – NWHO6 240V, 3o Figure 1 – NWHO 240V, 1o Figure 5 – NWHO6 480V, 3o Figure 4 – NWHO6 480V, 1o Note: Dotted lines indicate “customer furnished.” However, Thermostat could have been 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 NWHO Circulation Heaters are equipped with steel heating elements and galvanized- steel heating chambers. It is the responsibility of the user to know the chemical composition of the corrosiv...