Summary of Contents for Environmental Technologies ELECTRIC HEATERS
- Page 1 LECTRIC EATERS PERATION AND AINTENANCE ANUAL Stock ID: IOM-EH March, 2007 ©2007 Environmental Technologies Part No. PX-00-0164...
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Page 2: Table Of Contents
Minimum Wire Gauge ........................5 Field Wiring ............................6 Preventative Maintenance ........................6 Ampere Reading per kW........................6 Figure 1: Airflow Switch Probe ......................6 Troubleshooting Guide ........................7 Troubleshooting Guide, Proportional Heat Control (SSR)..............8 Sample Submittal Wiring Diagrams ....................11 - 12 ©March, 2007 Environmental Technologies... -
Page 3: Important Safety Precautions
More than one source of power may be present. Disconnect all power sources to avoid elec- trocution or shock injuries. HOT PARTS HAZARD. Electric Resistance heating elements must be disconnected prior to servicing. Electric Heaters may start automatically, disconnect all power and control circuits prior to servicing to avoid burns. WARNING Check that the unit assembly and component weights can be safely supported by rigging and lifting equipment. -
Page 4: Pre Start-Up
• All electric heat units are ETL listed for zero clearance to combustibles. • All electrical panels must have adequate working space in front of, above and to the side of heater to meet NATIONAL ELECTRICAL CODE criteria Section 110.26, or other pertinent local codes. ©March, 2007 Environmental Technologies... -
Page 5: Electric Heater Warning Labels
2/0 AWG 12 AWG 3/0 AWG 10 AWG 4/0 AWG 8 AWG 250 kcmil 6 AWG 300 kcmil 4 AWG 350 kcmil 3 AWG 400 kcmil 2 AWG 500 kcmil 1 AWG 600 kcmil 1/0 AWG ©March, 2007 Environmental Technologies... -
Page 6: Field Wiring
• When mounting field installed components, do not jumper out or rewire any factory wiring without written approval from Environmental Technologies, Inc. only. Violation will void warranty and listing. • Energize unit and check all controls for proper operation. Do not operate unit without proper airflow. -
Page 7: Troubleshooting Guide
• See remedies for “Improper Airflow“ • Check air velocity of 70 CFM per kW Heater w/SSR Incorrect Signal Applied • Verify signal input Does Not Operate • See pages 8 - 10 Interface Board Fuse Blown • Replace fuse ©March, 2007 Environmental Technologies... -
Page 8: Troubleshooting Guide, Proportional Heat Control (Ssr)
Briefly reapply power. If the section of heat under test now energizes, the SSR is defective. If heater still will not energize, one of the heater safety devices (limits, safety contactor or airflow switch) or elements is defective. ©March, 2007 Environmental Technologies... - Page 9 0 Current applied WITH 100 % HEATING DEMAND, ex. 277 Vac Optional C24 Module Fuse Between 20-26 Vac Element Between 0 Vac 277 Vac 3-32 Vdc Ammeter Full rated current | TUTCO HEATER INTERFACE | ©March, 2007 Environmental Technologies...
- Page 10 Input Over 20 mA Between = 100% capacity Ammeter Switch 5-30 Vdc Full rated current R820 SCR Control Signal 24 Vac Common 0 to 135 Ohms 24 Vac Input Over 135 Ohms = 100% capacity Switch ©March, 2007 Environmental Technologies...
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Page 11: Sample Submittal Wiring Diagrams
O. & M. • E LECTRIC EATERS ENVIRO-TEC HEATERS, Typical Wiring Diagram Not to be used for submittal or actual field wiring purposes. ©March, 2007 Environmental Technologies... - Page 12 • O. & M. LECTRIC EATERS ENVIRO-TEC HEATERS, Typical Wiring Diagram Not to be used for submittal or actual field wiring purposes. ©March, 2007 Environmental Technologies...
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