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Elements Net Weight (Lbs.)1 Phase 3 Phase RBC-31280 208 1,200 5.8 —— 4,094 1 85.0 ——RBC-31220 240 2.5 ——RBC-31240 480 RBC-32480 208 2,400 11.5 —— 8,188 2 8-3/410.0 ——RBC-32420 240 5.0 ——RBC-32440 480 RBC-33680 208 3,600 17.3 10.0 12,272 3 9-3/415.0 8.7RBC-33620 240 7.5 4.3RBC-33640 480 © 2010 Chromalox, Inc. GENERAL The Chromalox Type RBC-3 Radiant Heater is designed primar-WARNING: Users should install adequate controls ily as an indoor comfort heater to be used where supplemental heat is and safety devices with their electric heating needed or for spot heating in unheated areas and damp locations. equipment. Where the consequences of failure may Its aluminum construction and consequent light weight make it be severe, back-up controls are essential. ideal for suspension with the No. 2 size chain and “S” hooks pro-Although the safety of the installation is the vided. Aluminum reflector housing requires no painting and is eas-responsibility of the user, Chromalox will be glad to ily cleaned. assist in making equipment recommendations. MOUNTING WARNING: Hazard of Electric Shock. Disconnect all power before installing heater. Minimum mounting distances for all heaters are as shown in Figures A and B. Using the No. 2 size chain and “S” hooks furnished, heaters are to be suspended in a horizontal position only. NOTE: For proper balance, it is suggested that each of the four corners be individually suspended (rather than gathered into a common center mounting point, see Figure C and D). Figure A Figure B Figure C (Right Way) Conduit Furnished by Installer Figure D (Wrong Way) WIRING WARNING: Hazard of Electric Shock. Any installation the National Electrical Code and with local codes by a qualified involving electric heaters must be effectively person. WARNING: Use copper conductors only. grounded in accordance with the National Electrical WARNING: To prevent electrical wiring problems Code to eliminate shock hazard. due to overheating, route wiring conduit to avoid Electric wiring to heater must be installed in accordance with contact with reflector housing. Table B — Wiring Diagram Model 1 Phase 3 Phase 208V 240V 480V 208V 240V 480V Fig. Fig. Fig. Fig. Fig. Fig. RBC-31280 1 —— —— —— —— —— RBC-31220 —— 1 —— —— —— —— RBC-31240 —— —— 1 —— —— —— RBC-32480 2 —— —— —— —— —— RBC-32420 —— 2 —— —— —— —— RBC-32440 —— —— 2 —— —— —— RBC-33680 3 —— —— 4 —— —— RBC-33620 —— 3 —— —— 4 —— RBC-33640 —— —— 3 —— —— 4 WIRING DIAGRAMS Figure 1 For supply connection use 14GA. min. wire suitable for at least 75°C. Figure 2 For supply connection use 14GA. min. wire suitable for at least 90°C. Figure 3 For supply connections use wire suitable for at least 90°C (see below) 208V 10GA. min. 240V 12GA. min. 480V 14GA. min. Figure 4 For supply connection use 14GA. min. wire suitable for at least 90°C. OPERATION WARNING: This heater is not intended for use in hazardous atmospheres where flammable vapors, gases, liquids or other combustible atmospheres are present as defined in the National Electrical Code. Failure to comply can result in explosion or fire. 1. Minimum spacing from front of heater case to combustible material is: 4 ft. — RBC3-12 (1200W) 7 ft. — RBC3-24 or RBC3-36 (2400W or 3600W) 2. Avoid temperatures in excess of 194°F on nearby combustible surfaces. 3. Do not operate heaters at voltages in excess of that stamped on heater nameplate since excess voltage will shorten heater life. 4. CONTROLLING RADIANT INTENSITY — When it is desirable to reduce radiant intensity, Input Controllers may be used. These motor-driven cycling devices can be used to vary heater output capacity from 4% to 100%. Cycling devices are usually connected in holding coil circuit of magnetic contactors. For further information regarding Input Controllers and Contactors, see Chromalox catalog and/or contact your local Chromalox representative. 5. WARNING: Because of the possibility of someone unknowingly exposing the heater to combustible hazards, the heater should not be left in operation while unattended. MAINTENANCE WARNING: Hazard of Severe Shock. Disconnect all 3. Loosen and disengage hex nut and washer from threaded fitting. power to heater before servicing these heaters. 4. Pull element out of reflector housing and terminal box. 5. Slide new gasket (see Renewal Parts) onto threaded fitting of A. Element Replacement (See Figure E) replacement element. Note: Filler side of gasket faces away 1. Remove Terminal housing cover and gasket. from flange of threaded fitting. Insert new element through ter 2. Disconnect element leads from external leads. minal box opening, and slip on washer and hex nut before ele- Figure E Terminal Box Hex Nut Washer Compression Gasket Grounding Terminal Threaded Fitting ment enters reflector housing. Tighten hex nut until element mounting is secure. 6. Reconnect power supply leads to element terminals. Install new terminal cover gasket (see Renewal Parts). Install terminal box cover. Reconnect power to heater circuit. B. Care of R...