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Failure to comply can result in personal injury or property damage. The NWH-JR is a compact water circulation heater ideally suited for use as an engine coolant water heater and for many other uses where on-the-spot hot water is required. The copper-sheathed tubular heating element is centered in a galvanized iron or brass pipe body. Its screw-plug type mounting provides easy removal when necessary. The assembly is surrounded by insulation and a sheet metal jacket. An integral 60-180°F range thermostat is provided to control outlet temperatures. However, this control does not fail-safe. The system designer is responsible for the safety of this equipment and should install adequate back-up controls and safety devices with their electric heating equipment. Where the consequences of failure could result in personal injury or property damage, back-up controls are essential. INSTALLATION ELECTRIC SHOCK HAZARD. Disconnect all power before installing or servicing heater. Failure to do so could result in personal injury or property damage. Heater must be installed by a qualified person in accordance with the National Electrical Code, NFPA 70 1. The NWH-JR circulation heater should be mounted vertically with the terminal enclosure at the top. No additional support other than the connecting pipes is needed. 2. Make piping connections to either new or existing plumbing at the 1 x 11-1/2” NPT threaded inlet and outlet as shown above. 3. If foreign material is to be carried by the liquid flow, install suitable filters in the inlet pipe to the heater. 4. Provide adequate space at terminal end to permit withdrawal of the heater from chamber should servicing be required. FIRE HAZARD. Since heaters are capable of developing high temperatures, extreme care should be taken to: A. Provide a minimum of 6” spacing from chamber and related piping to nearest combustible material. B. Do not heat combustible materials. © 2010 Chromalox, Inc. WIRING ELECTRIC SHOCK HAZARD. Disconnect all power before installing or servicing heater. Failure to do so could result in personal injury or property damage. Heater must be installed by a qualified person in accordance with the National Electrical Code, NFPA 70. ELECTRIC SHOCK HAZARD. Any installation involving electric heaters must be performed by a qualified person and 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 the National Electrical Code and local codes by a qualified person as defined in the NEC. 3. Remove terminal cover by backing out screw in center of cover and feed wires through BX mounting bracket. (See Table B for recommended wire size.) 4. Connect one wire to the unused heater terminal and one to the unused thermostat terminal. Note: Do not disturb the existing jumper wire. (See Figure 2.) OPERATION Figure 2 5. To set thermostat, turn the slotted screw at top of thermostat counterclockwise until flat side is facing terminals. This is the “OFF” position. Next, turn the slotted screw clockwise until slot in screw points to the desired temperature shown on scale. Note: Scale is marked in increments of 10° Wire Size – Table B Model Volts Watts Recommended Wire Size NWHJR (G & B) 120 or 240 1500 14 NWHJR (G & B) 120 2000 12 14240 NWHJR (G & B) 120 2500 10 240 14 NWHJRG 120 3000 8 NWHJR (G & B) 240 3000 14 1. Do not heat solutions that are corrosive to the heating element the terminals may damage heater electrical insulation. Liquid-tight sheath or the heating chamber. terminal enclosures are available to protect heater. Check Factory. 2. Terminal ends of heater must be protected from drippings, con-3. Do not allow heater to operate when liquid flow is interrupted. densation, spray or direct spill-over of material. Their presence at MAINTENANCE 1. Remove heating element assembly periodically to check heater sheath for scaling, corrosion or excessive oxidation. Correct oper- ELECTRIC SHOCK HAZARD. Disconnect all power ating conditions to minimize sheath deterioration. before installing or servicing heater. Failure to do so 2. Periodically check temperature control operation to insure accurate could result in personal injury or property damage. and safe process operation. Heater must be installed by a qualified person in accor-3. Check all electrical connections periodically and retighten connecdance with the National Electrical Code, NFPA 70. tions 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 HEATING ELEMENT SUB ASSEMBLIES Terminal 120V 240V 120V 240V 120V 240V 120V 240V 1500W 1500W 2000W 2000W 2500W 2500W 3000W 3000W Thermostat Cover 156-018184-013 156-018184-014 156-018184-015 156-018184-016 156-018184-017 156-018184-018 156-043029-002 156-04302...