Chromalox Nwh 31225 Users Manual PE405 6 CHX
NWH-3925 IM-PE405
NWH-31225 im-pe405
NWH-3925 to the manual 2b0d73c3-cef8-4629-8a0a-e87394d5a1bb
2015-02-04
: Chromalox Chromalox-Nwh-31225-Users-Manual-364657 chromalox-nwh-31225-users-manual-364657 chromalox pdf
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® Chromalox Installation Operation SERVICE REFERENCE DIVISION and RENEWAL PARTS IDENTIFICATION D NWH SECTION PE405-6 (Supersedes PE405-5) 161-048380-001 DATE 1-3/8” Conduit Openings 4 SALES REFERENCE JULY, 1990 12-5/16” E Type NWH-3 Circulation Heater for Water Heating 1” Pipe Outlet Thermostat Type AR A B C Mounting Lugs 3/8” - 16 Threaded Holes 1-1/2” Deep 1-1/4” Centers 1” Pipe Inlet Specifications — Table A Model Voltage Phase kW Dimensions (In.) Watt Density A B C 16-1/2 1 or 3Δ 6 47.7 32-15/16 22-1/2 NWH-3925 240 1 or 3Δ 9 47.5 32-15/16 22-1/2 16-1/2 NWH-31225 or 1 or 3Δ 12 46.2 42-15/16 32-1/2 26-1/2 NWH-31525 480 1 or 3Δ 15 45.9 55-7/16 45 39 1 or 3Δ 18 45.6 55-7/16 45 39 NWH-3625 NWH-31825 F GENERAL The NWH-3 series is a general-purpose water or water-based solution circulation heater intended for use indoors. It is designed for 150 psig at 550˚F per ANSI standards. The 3 copper-sheathed tubular elements are centered in a 3” 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 NWH-3 may or may not be factory equipped with an AR or other Chromalox thermostat. Such thermostats function to control outlet temperatures and to limit internal temperatures under abnormal flow conditions. These controls do not fail safe. CAUTION: Users should install adequate back-up controls and safety devices with their electric heating equipment. Where the consequences of failure may be severe, backup 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 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. 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.) Correct Incorrect Correct Incorrect Figure A — Vertical Mounting © 2010 Chromalox, Inc. Figure B — Horizontal Mounting 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 NWH-3 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. 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 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 Codes. 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. Wiring Diagrams - Table B 240V, 1 Ø Fig. 240V, 3 Ø Δ Fig. 480V, 1 Ø Δ Fig. 480V, 3 Ø Δ Fig. NWH-3625 2 1 2 1 NWH-3925 2 1 2 1 NWH-31225 2 1 2 1 NWH-31525 2 1 2 1 NWH-31825 2 1 2 1 Model Contactor Ground Contactor Ground Line L1 L2 L3 120V or 240V 120V or 240V Figure 1 240V, 480V 3ØΔ Thermostat Thermostat Figure 2 240V, 480V, 1Ø Use contactor when the heater amperage exceeds the rating of the thermostat. 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 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 circulation 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. Contact your Local Chromalox Sales office. 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 Electric Shock. Disconnect all power before servicing heater. 2. Remove heating element assembly periodically to check heater sheath for scaling, corrosion or excessive oxidation. Correct operating conditions to minimize sheath deterioration. 3. Periodically check temperature control and limit control operation to insure accurate and safe process operation. 4. Check all electrical connections periodically and retighten connections which may have loosened in service. Replace wire and wire terminals which show signs of oxidation which would interfere with establishment of reliable electrical connections. RENEWAL PARTS IDENTIFICATION AR2525 Thermostat Assembly MF7 Thermostat Assembly Model Volts Phase kW Heating Elements NWH-3625 NWH-3625 NWH-3625 NWH-3625 240 240 480 480 1 3Δ 1 3Δ 6 6 6 6 155-024796-001 155-024796-002 155-024796-003 155-024796-004 300-057560-007 300-057560-007 300-057560-007 300-057560-007 300-048481-006 300-048481-006 300-048481-006 300-048481-006 NWH-3925 NWH-3925 NWH-3925 NWH-3925 240 240 480 480 1 3Δ 1 3Δ 9 9 9 9 155-024796-006 155-024796-007 155-024796-008 155-024796-009 300-057560-007 300-057560-007 300-057560-007 300-057560-007 300-048481-006 300-048481-006 300-048481-006 300-048481-006 NWH-31225 NWH-31225 NWH-31225 NWH-31225 240 240 480 480 1 3Δ 1 3Δ 12 12 12 12 155-024796-011 155-024796-012 155-024796-013 155-024796-014 300-057560-007 300-057560-007 300-057560-007 300-057560-007 300-048481-006 300-048481-006 300-048481-006 NWH-31525 NWH-31525 NWH-31525 NWH-31525 240 240 480 480 1 3Δ 1 3Δ 15 15 15 15 155-024796-016 155-024796-017 155-024796-018 155-024796-019 300-057560-007 300-057560-007 300-057560-007 300-057560-007 300-048481-006 300-048481-006 300-048481-006 300-048481-006 NWH-31825 NWH-31825 NWH-31825 NWH-31825 240 240 480 480 1 3Δ 1 3Δ 18 18 18 18 155-024796-021 155-024796-022 155-024796-023 155-024796-024 300-057560-007 300-057560-007 300-057560-007 300-057560-007 300-048481-006 300-048481-006 300-048481-006 300-048481-006 Note: When ordering parts for Model Numbers suffixed by “XX” or any other letter or letters not specifically identified on this instruction sheet, order Renewal Parts on special order basis, giving name of part, part number, model number and description. PARTS COMMON TO ALL HEATERS AR Mounting Bracket . . . . . . . . . . . . . . . . .027-011378-001 (2) Flexitallic Gasket . . . . . . . . . . . . . . . . . . . . . .132-019779-001 Standard Gasket . . . . . . . . . . . . . . . . . . . . . . .132-017222-001 Note: Number in ( ) indicates quantity of same part number used. Limited Warranty: Please refer to the Chromalox limited warranty applicable to this product at http://www.chromalox.com/customer-service/policies/termsofsale.aspx. 2150 N. RULON WHITE BLVD., OGDEN, UT 84404 Phone: 1-800-368-2493 www.chromalox.com PL - U0 - T3 Litho in U.S.A.
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0.000000, 0.000000, 0.000000, 0.000000, 0.000000, 0.000000, 0.000000, 0.000000, 0.000000 Producer : Acrobat Distiller 9.3.2 (Macintosh) Keywords : circulation heaters, water heating, circulation heater, tubular elements, controls, thermostats Page Count : 4 Author : Diane Warning : [Minor] Ignored duplicate Info dictionaryEXIF Metadata provided by EXIF.tools