ELECTRICAL REQUIREMENTS: 1. APPLICATION (Describe in Detail): □ Chromalox Standards □ Other (Specify) 7.AGENCY APPROVALS: □ None □ UL Component Recognized 2. HEATED MEDIUM (Specify): □ Gas □ CSA Certified □ Liquid □ Solid □ Other (Specify) 3. MAXIMUM WORK TEMPERATURE: °F 8. OTHER SPECIAL FEATURES: 4. MAXIMUM SHEATH TEMPERATURE: °F □ Bending; Dish to 15 in. Spherical Radius 5. INSTALLATION ENVIRONMENT: □ Indoor □ All Heat Construction (If Tooling Available; Check Factory) □ Outdoor

______________________________________________ Power Circuit Voltage __________________________ Model No. ___________________________________________________ Control Circuit Voltage__________________________ National Board No. ____________________________________________ Amps ___________Phase __________Cy __________ IMPORTANT – This data file contains the National Board Registration Certificate approving your boiler. It must be kept near the boiler at all times. Model Electric Capacity BHP Ratin

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Circuit Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Control Circuit Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . National Board No. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Amps . . . . . . . . . . . . . . . Phase . . . . . . . . . . . Cy . . . . . . . . .

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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 vert

3. Power controllers must be used when heaters are rated 3 phase and when the heater amperage exceeds the rating of the thermostat. 4. Refer to Wiring Diagram, Table B, for the proper wiring diagram for connecting heater. Model 240V, 1 O Fig. 240V, 3 O . Fig. 480V, 1 O . Fig. 480V, 3 O . Fig. NWH-3625 NWH-3925 NWH-31225 NWH-31525 NWH-31825 2 2 2 2 2 1 1 1 1 1 2 2 2 2 2 1 1 1 1 1 Figure 1 240V, 480V 3O. Figure 2 240V, 480V, 1O Use contactor when the heater amperage exceeds the rating of the therm

6 47.7 32-15/16 22-1/2 16-1/2 NWH-3925 240 1 or 3. 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

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 d