Electric Duct Heater Wiring Diagram – 1 Installation, Operation and Maintenance of Electric Duct Heaters Manual Stock ID: IOM-EDH Reprinted June, Environmental Technologies, Inc. Largo, FL Part no. PX
2 Electric Duct Heater I.O.M. Table of Contents Description Page Pre-Start…3 Acceptance and Inspection…3 Unit Placement…3 Clearance…3 Electric Heater Warning Labels…4 Minimum Air Velocities Open Coil Construction…5 Fined Tubular Construction …5 Heater Side Slip-In Installation Instructions…6 Insulated…6 Flanged…7 Round Duct…7 Remote Control Panel…7 Minimum Wire Gauge…8 Field Wiring. ..8 Preventive Maintenance…8 Ampere Reading per kw…9 Airflow Switch Probe Reversal…9 Troubleshooting Guide…9 Sample Wiring Diagrams…10 Troubleshooting Guide, Proportional Heat Regulation (SSR).. .12 Troubleshooting Guide, Vernier Heat Control…14 Replacement Parts…14 Important Safety Precautions Electric Duct Heater IOM June, 2001 Environmental Technologies, Inc.
Electric Duct Heater Wiring Diagram
3 I.O.M. Electric Duct Heater Pre-Startup Warning: Improper installation, adjustment, modification, service or maintenance may result in injury and property damage, as well as void the factory warranty. For assistance or additional information, contact a qualified contractor and your local ENVIRO-TEC representative. RECEIVING AND INSPECTION Carefully inspect the exterior and interior of all units for transit damage. If damage is found, file a claim with the carrier immediately. Note the damage to the bill of lading while signing for the shipment. Review the bill of lading to verify that all items shown (including loose items) have been received. Notify the ENVIRO-TEC representative of any deficiencies or incorrectly shipped items. Do not touch the heating elements of the unit, as permanent damage may occur. Handling the Unit WARNING: Never run the heater without proper ventilation. Install ductwork to comply with ASHRAE Fundamentals Handbook, SMACNA, NFPA 90A and local codes. ENVIRO-TEC Duct Heaters are manufactured under ETL File #549556, or ETLC File #548276 and must be installed in accordance with all national and local codes. Improper installation of these components may result in removal of the listing label and/or void the warranty. Airflow and airflow patterns are important to heater operation and life (see airflow graph on page 5). Proper airflow prevents tampering with thermal safety devices. Open coil duct heaters are certified for either horizontal airflow in either direction or vertical airflow. Some heaters may have position sensitive devices (mercury contactors or solid state relays) and can only be mounted in their specifically designed configuration. These heaters are identified with the specified mounting configuration labels. Do not install a slip-in or flanged heater intended for horizontal mounting above or below a horizontal duct. Do not install a heater rated for horizontal airflow in a vertical duct or a vertical heater in a horizontal duct. When the airflow switch is used as a fan interlock, the heater has an air pick-up probe. The pick-up probe has a directional arrow and can only be rotated in horizontal units (see Figure 6 on page 9). Install units in a duct section with uniform air velocity over the entire surface area of the duct. For best performance, heaters should be installed at least 4 feet from heat pump, converter, air conditioner or other ductwork obstructions. According to the NEC article, baffles, pressure plates, or other devices may be used to ensure air distribution when mounted less than 4 feet. Duct heaters for internally insulated ducts are designed to adjust the thickness of the insulation. Clearance All electric heat units are ETL listed for zero clearance of combustibles. Therefore, the height of the element frame is 1″ less than the unregulated duct and the width is 1/2″ less. All electrical panels must have a 36″ working space in front of the panel to meet the National Electrical Code; however, local inspectors may waive this requirement if the hinged cover has 90 free swings. Environmental Technologies, Inc .June, 2001 Electric Duct Heater IOM 3
Direct Fired Duct Heater
4 Electric Duct Heater I.O.M. Electric Heat Warning Labels Labels shown on the door of all electric heat units comply with our ETL listings to UL 1996 and CAN/CSA C22.2 Any compliance with these warning labels will prevent possible damage or injury to equipment and/or property. WARNING ELECTRIC SHOCK DANGER. More than one disconnect switch may be required to energize equipment for service. Be sure to disconnect the electric power before servicing. ATTENTION: DISCONNECTOR DU CIRCUIT D ALIMENTATION ELECTRIC AVANT L ENTRITION. Disconnect hazard labels Ensure all power is removed before servicing equipment. BEWARE OF ELECTRICAL HAZARD After installation and before powering up this unit, check all electrical connections for tightness. All electrical connections should be periodically checked for tightness. Alterations to internal components or wiring may also result in delisting the product and voiding all warranties. START WARNING LABEL Secure all wiring lugs and terminals before connecting power to the unit, as they may come loose during shipping. 4 Electric Duct Heater IOM June, 2001 Environmental Technologies, Inc.
5 I.O.M. ELECTRIC DUCT HEATER MINIMUM AIR SPEED 1600 SPEED (FPM) AIR INLET (D. F) KW/SQ FT. OPEN COIL CONSTRUCTION M/MIN. FPM Velocity Horizontal Airflow Vertical Airflow Inlet Air Temperature 77 F, 25 C KW/SQ FT Max Kw/Sq. Ft. Fined Tubular Construction Environmental Technologies, Inc. June, 2001 Electric Duct Heater IOM 5
6 Electric Duct Heater I.O.M. Figure 1 Horizontal Duct Heater (Type SS) Installation Instructions Figure 2 Vertical Duct Heater (Type VS) Vertical Up Airflow Only Model EDHSS (Side Slip-In, Vertical Slip-In) Installation of a slip-in heater involves cutting the length of the heater element section in the duct and approximately 1/4″ larger than the width. Insert the heater and fasten the duct with sheet metal screws through the control enclosure. Use extreme care to protect electrical components, as metal chips lodged in the components can cause failure. Remove any metal chips in the electrical enclosure before connecting power. NOTE: Element section To prevent it from moving inside the duct, angle clips, brackets or blanks should be attached to the frame.Figure 3 Insulated Duct Heater (SS Type) Note: Heaters are designed to accommodate the thickness of insulation, mounting an electric heater in an insulated duct is the same as described above for SS type heaters.
7 I.O.M. Electric Duct Heater Installation Instructions Figure 4 Flanged Heater Installation (Type SF) Model EDHSF (Flanged) Flanged heaters are designed with the flanges off. Installing a side flanged heater involves inserting the flanged duct heater section into the duct and bolting it in place. Raintight heaters are enclosed in a flanged section. The unit is assembled as above. A weatherproof seal should be made while mounting these units. Figure 5 Round Duct Heater (Type RD) Installation of a round duct heater involves attaching the round duct to the inlet and outlet flanges and bolting in place. Connection and duct joint sealing. Model RCMP (Remote Control Panel) Install the control panel in a suitable location for the particular panel type. The wiring diagrams inside the heater door and remote control panel door show point-to-point interconnecting wiring. Wiring must be letter to letter (“A” to “A”) or number to number (“1” to “1”). Labels on each door (heater/panel) indicate configuration. Do not deviate from this label. Panels shall be installed in view of the unit unless additional disconnection is provided on the unit. Environmental Technologies, Inc. June, 2001 Electric Duct Heater IOM 7
Warren Electrical Duct Heater Cbk 4.11 12.00×12.00 480v 3ph 60hz 4.9a 1 Step
8 Electric Duct Heater I.O.M. Minimum Wire Gauge (from Table NEC 1996 Wire Rate 75 C) Amps Minimum Wire Gauge AWG 175 2/0 AWG AWG 200 3/0 AWG0 Kilo AWG AWG 5 kW /0 AWG Power Wiring Control Wiring Transformer Wiring Phase Primary Voltage (Same as Power Wiring) L1 Black Phase 1 Red Secondary L2 Red Step 2 Purple 24 Volt 2073 Ni Yellow Negative Red N White Step 4 Brown Positive Blackput Green Ground Pos NOTE: Wire gauges 8 and larger components are colored with tape. Field Wiring Note: Before installing any wiring, check the unit’s name plate for mains voltage, control voltage and maximum overcurrent protection. Operating the heater outside of the specified voltage and phase may result in a fire or electrical hazard. All field wiring must comply with National Electric Code and local code requirements. A point-to-point wiring diagram is located inside the control panel door, detailing the wiring and field wire gauges. Use only copper conductors with minimum insulation of 75 C. Tighten all wiring lugs and terminals before connecting power to the unit, as they may become loose during transit. Connect the power lines to the power distribution terminals inside the control enclosure and tighten to 35 inch pounds (.4kg meters). If a factory wired disconnect switch is installed, connect the power lines to the line on the side of the switch. Line block or disconnect rated at 125% of nominal heater amperes based on 75C wire. Mount and wire any field installed items as shown
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