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manual abstract
Finstrips No. Ckts. Dimensions (In.) (Note 1) (Note 2) A B C CAB-62 CABB-62 CAB-611 CABB-611 25 120, 208, 240 or 480 1 or 3 6 6 1 10-3/4 15-7/8 11-1/2 CAB-122 CABB-122 CAB-1211 CABB-1211 35 208, 240 or 480 1 or 3 12 9 1 15-3/8 18-1/2 14-1/8 CAB-152 CABB-152 CAB-1511 CABB-1511 40 208, 240 or 480 1 or 3 15 9 1 15-3/8 21-5/8 17-1/4 CAB-202 CABB-202 CAB-2011 CABB-2011 55 208 or 240 3 20 12 1 20-1/8 21-5/8 17-1/4480 1 or 3 CAB-252 CABB-252 CAB-2511 CABB-2511 65 208 or 240 3 25 12 1 20-1/8 26-1/8 21-3/4480 1 or 3 —— CABB-3011 75 480 3 30 18 2 29-1/2 21-5/8 17-1/4 CAB-402 CABB-402 CAB-4011 CABB-4011 90 208 or 240 3 40 18 2 29-1/2 27-3/8 23480 1 or 3 CAB-502 CABB-502 CAB-5011 CABB-5011 110 208 or 240 3 50 18 2 29-1/2 33-1/8 28-3/4480 1 or 3 CAB-752 CABB-752 CAB-7511 CABB-7511 200 208 or 240 3 75 27 3 44-7/16 42-1/8 37-3/4480 1 or 3 CAB-1002 CABB-1002 CAB-10021 CABB-10021 220 208 or 240 3 100 27 3 44-7/16 47-1/2 43-1/8480 1 or 3 1. Iron sheath strip heaters — for sheath temperatures to 750°F. 2. Chrome steel sheath strip heaters — for sheath temperatures to 950°F. © 2010 Chromalox, Inc. Drop - In. of Water (LBS/In2 = IN. of Water x 0.036) Pressure Drop - In. of Water (LBS/In2 = IN. of Water x 0.036) GENERAL 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. Heat Construction Characteristics: A. Finstrip® elements of either rust resisting iron or chrome Table 2 steel sheath, and aluminized steel fins. B. 14 gage cold rolled steel frame painted with a black powder coat paint. C. Internal electrical connections consist of buss bars and jumper straps of either Mn-Ni or Monel. D. Field wiring terminals of heavy duty 3/8” diameter bolts of either brass (iron sheath units) or stainless steel (chrome steel sheath units) with hardware are provided for field wiring connections. 2. Maximum temperatures — Type CAB and CABB air duct heaters can generally be used at the following maximum temperatures provided the minimum air velocity is maintained uniformly through the heater. Table 2 is based on the standard unit of 26 watts per square inch. If unit watt density is lower, higher temperatures can be achieved. If higher watt densities are used, outlet air temperature should be lowered. 3. Several heaters may be mounted in tandem as long as proper controls are used to limit the maximum temperature attained. See pressure drop curve G112S1 for effect of mounting in tandem. 4. Overtemperature protection — A thermal cutout should be installed at the exhaust side of the heater for protection against low airflow conditions. INSTALLATION Air Velocity Max. Outlet Air Temp. (°F) (Ft./Sec.) Iron Sheath Chrome Steel Sheath 4 — 200 9 90 330 16 220 440 Velocity of Air F.P.M. (STD. Air) Curve G112S1 - Resistance to Air Flow WARNING: Hazard of Electric Shock. Disconnect a. Avoid installing heaters in an atmosphere containing comall power before installing heater. bustible gases and vapors. 1. Install heater into desired location in air duct with terminals b. Avoid contact between heater and combustible material. on bottom. c. Keep combustible material far enough away to be free of 2. For installation where the duct heater is larger than the duct-the effects of high temperatures. work, the duct area must be increased by a sheet metal transition. The slope of the transition piece on the upstream side is limited to 30° as indicated in Figure 2. On the leaving side, the slope should not be more than 45°. 3. Make sure ductwork is of sufficient strength to contain the heater. Refer to Table 1 for heater weights. Consult your local sheet metal contractor if in doubt. 4. Two holes 5/16-18 tapped are located on each side of the heater for mounting. 5. Air velocity must be sufficient enough to prevent element failure. See Table 2 for guidelines. 6. For protection against accidental air stoppage, mount a thermal cutout on the exhaust side of the heater. 7. Insert thermal cutout sensitive bulb through duct and attach to heater case with mounting clips provided. 8. DANGER: Hazard of Fire. Since these heaters are capable of developing high temperatures, extreme care should be taken to: AirFlow30° Max30° 45° 45° Duct Heater4 Ft. Min.4 Ft. Min. Figure 2 WIRING WARNING: Hazard of Electric Shock. Any installation wiring runs in heated zones. When ambient temperature in involving electric heaters must be effectively ground-heated zone exceeds that for which insulated wire is recomed in accordance with the National Electrical Code to mended use bare nickel-plated copper with porcelain beads, eliminate shock hazard. tubing or buss bar. Consult local Chromalox representative. 4. Users should install adequate back-up controls and safety 1. All wiring should be done in accordance with the National devices with their electric heating equipment. Selection of Electrical Code ...