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Manafacture: Chromalox File size: 130.8 kb File name: Language of manual:

9 47.5 32-15/16 22-1/2 16-1/2 NWH-31225 or 1 or 3. 12 46.2 42-15/16 32-1/2 26-1/2 NWH-31525 480 1 or 3. 15 45.9 55-7/16 45 39 NWH-31825 1 or 3. 18 45.6 55-7/16 45 39 GENERAL The NWH-3 series is a general-purpose water or water-based thermostat. Such thermostats function to control outlet tempera- solution circulation heater intended for use indoors. It is designed tures and to limit internal temperatures under abnormal flow con- for 150 psig at 550°F per ANSI standards. ditions. These controls do not fail safe. The 3 copper-sheathed tubular elements are centered in a 3” CAUTION: Users should install adequate back-up controls diameter galvanized steel heating chamber and welded to a and safety devices with their electric heating equipment. removable galvanized steel flange. The assembly is surrounded Where the consequences of failure may be severe, back- by 1-1/2” insulation and sheet metal jacket. up controls are essential. Although the safety of the Depending upon the order specifications, the NWH-3 may or installation is the responsibility of the user, Chromalox may not be factory equipped with an AR or other Chromalox will be glad to make equipment recommendations. INSTALLATION CAUTION: Hazard of Electric Shock. Disconnect all Note: A drain pipe located at the bottom of the heater should power before installing heater. be provided and enough room left, when mounting heater, to allow draining the heater. When the heater is vertically mounted, the terminal housing 2. Horizontal Mounting (Optional) — will be at the top of the heater. The water inlet pipe will be located on When mounting heater horizontally, inlet and outlet pipes the side near the bottom of the heater and the outlet pipe at the top. must be up. In any other position, heater cannot be purged of air, The axis of the chamber will be in a vertical position as in 1. Vertical Mounting (Preferred) — and elements may be seriously damaged. (See Figure B.) the photo above, and as in Figure A. Incorrect Correct Figure A — Vertical Mounting Figure B — Horizontal Mounting Correct Incorrect © 2010 Chromalox, Inc. INSTALLATION 3. Whether vertically or horizontally, the heater should be rigidly 5. DANGER: Hazard of Fire. Provide minimum of 6” spacmounted so that vibration is at a minimum since excessive ing from chamber and related piping to nearest combustible vibration will result in erratic thermostat operation. The material. Avoid operation of heater near combustible fluids or NWH-3 is provided with mounting lugs to support the heating in combustible vapor or gas laden atmosphere. chamber. (See photo.) 6. Provide adequate space at terminal end to permit withdrawal 4. By using a slotted mounting assembly on either of the lugs, of the heater from chamber should servicing be required. the heater chamber will be permitted to expand with increasing temperature. WIRING WARNING: Hazard of Electric Shock. Any installation Wiring Diagrams - Table B involving electric heaters must be effectively groun...

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