Chromalox POO400-7 - Manual (Page 4)

2150 N. RULON WHITE BLVD., OGDEN, UT 84404
Phone: 1-800-368-2493 www.chromalox.com
GENERAL INFORMATION
1. Strips of equal wattage and voltage can be series connected for
a maximum of 480 volts. If a higher voltage (600 volt max.) is
necessary use the same series connections and use secondary
insulation bushings.
2. Use iron or steel sheathed heaters for temperatures up to 750˚F
maximum sheath temperature. Use chrome steel sheathed strips
for temperatures up to 1200˚F maximum sheath temperature.
Use alloy or Inconel® sheathed tubular heaters for temperatures
up to 1500˚F maximum sheath temperature. The sheath temper-
ature is the highest temperature on the surface of the heater
when operating.
3. Do not bend or form strips.
4. Use manganese nickel wire or alloy bus bar for making electri-
cal connections where temperatures are above 350˚F. Insulated
copper wire may be used in the cooler region.
5. Terminals should always be in the coolest part of the oven. If
oven temperature is over 800˚F the terminals should be placed
outside the oven if possible. If not possible, weld electrical con-
nections to heater terminals. Protect terminals from welding
flux.
6. Tubulars are to be mounted the same as strips and supported on
24” centers.
MAINTENANCE
ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do
so could result in personal injury or property dam-
age. Heater must be installed by a qualified per-
son in accordance with the National Electrical
Code, NFPA 70.
1. Periodically clean terminals of dust and corrosion to maintain
good electrical connections and to permit rapid heat dissipation.
Use airblast and be careful to avoid damage to mica insulation.
2. Check for loose terminal connections.
CHROMALOX ELECTRIC HEATING ELEMENTS FOR OVEN HEATING – AIR DUCTS (cont’d)
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.