Electric Duct Heaters

Transcription

1 Electric Duct Heaters 12541_Tutco_Catalog.indd 1 3/4/11 8:46:01 AM

2 TYPICAL HEATER CONSTRUCTION TUTCO, the world s largest supplier of open coil heating elements, produces the highest quality products in the market. Our unique design allows for free flow of air around ceramics and lowest possible pressure drop through element and rack, providing forced air applications that are an environmentally sound solution for your project. DESIGNED FOR ZERO CLEARANCE, ALL HEATERS ARE PROVIDED WITH STANDARD FEATURES: Fan interlock Ground lugs 105ºC appliance wire Secondary protection Factory assembled and wired Control panel of heavy gauge corrosion resistant steel Removable hinged access door with latch Components secured to a raised plate Single source power entry Detailed wiring diagrams UL file E UL file E CSA file LR TYPICAL APPLICATIONS: Space heating Primary heating Secondary heating Auxiliary heating Reheating Multizone and variable air volume heating _Tutco_Catalog.indd 2 3/4/11 8:46:04 AM

3 DHB & DB SERIES BASIC HEATER INCLUDES: Meets disconnecting contactor requirements 50 or 60 HZ design Fan interlock Power terminal board Control terminal board Grounding lugs Automatic limit switch for primary over temperature protection Manual reset limit switch for secondary over temperature protection Left hand offset control box OPTIONS: Standard supply voltages, Standard control voltages, Single or three phase Staging is an option and three phase heaters may utilize unbalanced staging Slip in or flange mounted Recessed control box Right hand offset control box 80/20 (Ni/Cr) resistance wire Stainless steel terminals Vapor barrier Gasketed cover ACCESSORIES: See accessories page NOTE: Heater shown with optional recess DESIGN LIMITATIONS DHB & DB POWER MAX. MAX. MAX. MAX. MAX. MAX. SIZE W X H VOLTAGE PHASE KW AMPS STAGES ELEMENTS SLIP IN FLANGE X X X X ,277, X X X X X X X X X X 34 Multiple stage heaters do not always provide full face coverage. For multizone or full face coverage requirements see DHC & DC series heater 1. Three phase only staging may be unbalanced 2. Minimum size 8" x 6". Three phase only minimum height 8" 3. Recess box only minimum width 8" plus recess These limitations are general guidelines. Other limitations may be encountered due to KW, volts, phase, stage, and size relationship _Tutco_Catalog.indd 3 3/4/11 8:46:14 AM

4 DHC & DC SERIES BASIC HEATER INCLUDES: A disconnecting magnetic control contactor per stage or each 48 AMP circuit within a stage 50 or 60 HZ design Fan interlock Power terminal board Control terminal board Grounding lugs Automatic limit switch for primary over temperature protection Manual reset limit switch for secondary over temperature protection Left hand offset control box OPTIONS: Standard supply voltages, Standard control voltages, Single or three phase Staging (balanced, unless otherwise specified) Slip in, flange mount, bottom mount Recessed control box Right hand offset control box 80/20 (Ni/Cr) resistance wire Stainless steel terminals Derated coils Vapor barrier Gasketed cover ACCESSORIES: See accessories page DESIGN LIMITATIONS DHC & DC Multiple stage heaters do not always provide full face coverage. For multizone or full face coverage requirements notify factory. 1. Maximum 500 KW 2. Maximum of (14) 48 AMP circuits 3. Maximum 10' wide and 12' high 4. Minimum 8" x 6". Three phase only minimum height 8" 5. Recess box only minimum width 8" plus recess These limitations are general guidelines. Other limitations may be encountered due to KW, volts, phase, stage, and size relationship _Tutco_Catalog.indd 4 3/4/11 8:46:16 AM

5 DHD & DD SERIES BASIC HEATER INCLUDES: 50 or 60 HZ design High voltage and low voltage terminal boards to interconnect heater with remote panel Grounding lugs Automatic limit switch for primary over temperature protection Manual reset limit switch for secondary over temperature protection Left hand offset control box OPTIONS: Standard supply voltages, Standard control voltages, Single or three phase Staging (balanced, unless otherwise specified) Slip in, flange mount, bottom mount Recessed control box Right hand offset control box DESIGN LIMITATIONS DHD & DD 80/20 (Ni/Cr) resistance wire Multiple stage heaters do not always provide full Stainless steel terminals face coverage. For multizone or full face coverage Derated coils requirements notify factory. 1. Maximum 1500 KW Vapor barrier 2. Maximum 10' wide x 12' high Gasketed cover 3. Minimum 8" x 6". Three phase only minimum height 8" ACCESSORIES: Air flow switch 4. Recess box only minimum width 8" These limitations are general guidelines. Other limitations may be encountered due to KW, volts, phase, stage, and size relationship _Tutco_Catalog.indd 5 3/4/11 8:46:18 AM

6 RMC REMOTE PANELS BASIC HEATER INCLUDES: A disconnecting magnetic control contactor per stage or each 48 AMP circuit within a stage A magnetic backup contactor for each 48 AMP circuit 50 or 60 HZ design Fan interlock Grounding lugs High voltage and low voltage terminal boards to interconnect remote panel with DHD or DD heaters Mounting brackets OPTIONS: Standard supply voltages to match DHD or DD heaters Standard control voltages to match DHD or DD heaters Single or three phase to match DHD or DD heaters Staging to match DHD or DD heaters Gasketed cover NEMA 1 wall mounted panel NEMA 4 wall mounted or freestanding panel NEMA 12 wall mounted or freestanding panel ACCESSORIES: See accessories page _Tutco_Catalog.indd 6 3/4/11 8:46:20 AM

7 DE-RATED HEATING COILS: For installations with a single zone or multi-zone air handler Heating coils should be derated to 25, 35 or 45 watts per square inch of wire surface Standard watt density is 60 to 70 watts per square inch Derating coils is not a substitute for proper air distribution Not available in DHB & DB Series A GRADE ELEMENT WIRE: Wire available in 80% nickel, 20% chromium when specified on all heater series OPTIONS BOTTOM MOUNT HEATERS: Bottom mount, slip in or flanged type Available in DHC, DC, DHD & DD only Not available with SSR control, step controllers, mercury contactors, and disconnect switches RECESSED TERMINAL BOX: Designed to extend beyond internally insulated ducts Slip in or flanged type Width dimension is equal to the outside duct width minus insulation thickness Height dimension is equal to the outside duct height minus two times the insulation thickness Recess depth dimension is equal to the thickness of insulation GASKETED COVER: Compression type gasket Permanently attached to panel flanges Seals door opening Seams are filled with filler STAINLESS STEEL TERMINALS: Stainless steel heater element terminal screws are available upon request INSULATING VAPOR BARRIER: Eliminate unnecessary condensation Factory applied insulation to back of control box SPARE PARTS: All heaters are custom built Each bear UL listing label Each bear ID serial number Each bear a catalog number Spare parts can be provided when furnishing complete nameplate information for units less than 10 years old MAINTENANCE & SERVICING: Proper installation shall provide minimum maintenance for long life and trouble free operation WARNING DO NOT ATTEMPT TO CLEAN OR SERVICE WITHOUT DISCONNECTING ALL SOURCES OF POWER _Tutco_Catalog.indd 7 3/4/11 8:46:22 AM

8 ACCESSORIES MAGNETIC CONTACTORS: Standard in all duct heaters Used for primary or back-up control UL approved for 250,000 cycle operation MERCURY CONTACTORS: Recommended where noise levels are of concern Contacts are made and broken between two pools of mercury, separated by a ceramic insulator Design ensures clean snap action No chatter and little contact arcing Position sensitive Must specify horizontal or vertical air flow UL listed for 250,000 cycle operation Not available on bottom mount heaters 2 Pole Magnetic Contactor WARNING This product contains mercury, a substance which is known to the state of California to cause birth defects or other reproductive harm. Avoid exposure to or contact with the mercury displacement relay contained in this product. Contact the manufacturer of the relay for proper disposal. Dispose according to local, state or federal laws. 3 Pole Magnetic Contactor ELECTRONIC STEP CONTROLLER: Provides electronic sequencing control of an electric duct heater up to 12 steps When interruption of power occurs, all the stages will recycle to off. Upon the restoration of power, re-energize the switches in a stepping sequence Commonly used with a 2 10 vdc from a stand alone T-stat, 2-10 vdc from a DDC building automation system and 4-20 ma from a building automation system; check with the factory for availability Not available on DHB & DB Series or bottom mount heaters 2 Pole Mercury Contactor Electronic Step Controller _Tutco_Catalog.indd 8 3/4/11 8:46:24 AM

9 AIR FLOW SWITCH: Prevents heater from being energized when the fan is not on UL required Non adjustable airflow switch (shown) requires a minimum of.07"wc pressure Adjustable airflow switch available with rating of.05" ±.02" WC to 12"WC POWER FUSING: UL standards and NEC code required for heaters drawing more than 48 AMPS Accessory fusing is available on heaters drawing less than 48 AMPS when requested CONTROL TRANSFORMER: Utilized when control voltage differs from line voltage Primary over current protection Class 1 units must have primary side protection by fusing Class 2 units have internal protection and do not require additional fusing unless specified Air Flow Switch Fuse Block Control Transformer Power Fusing _Tutco_Catalog.indd 9 3/4/11 8:46:27 AM

10 ACCESSORIES (cont.) TERMINAL BLOCKS: High voltage terminal blocks are sized for copper conductors only Sized to accept up to: (1) 500 MCM line feeder per pole. Heaters requiring feeders greater than 500 MCM will be supplied with main power terminal blocks which will accept (2) parallel feeders up to 500 MCM each per pole Low voltage control circuit terminal boards are included for ease of field connection TIME DELAY RELAY: Relays provide a time delay of 30 to 60 seconds when energizing or de-energizing the circuit controlled Standard control voltages of 24 through 277 Terminal Blocks PILOT LIGHTS: Side panel installation for indicating the following heater conditions: Heater energized Step energized Air flow switch open Pilot light control voltages must be 24 or 120 volts Terminal Blocks Pilot Light Timed Delay Relay _Tutco_Catalog.indd 10 3/4/11 8:46:34 AM

11 PRESSURE ELECTRIC SWITCHES: Provide an interlock when basic control system is pneumatic Wired to close on pressure rise Not factory set. Will require field adjustments to specific job requirements DISCONNECT SWITCHES: Available unfused door interlocking disconnect switch (max. 384 AMPS) Not available on bottom mount heaters S.S.R.: Solid state relays (S.S.Rs.) provide the finest in electric duct heater control 100% solid state stepless modulation Noiseless Power and heat output precision Not available on DHB & DB series or bottom mount heaters PE Switch S.S.R. Disconnect Switch _Tutco_Catalog.indd 11 3/4/11 8:46:37 AM

12 PRESSURE DROP THROUGH HEATER TECHNICAL DATA DETERMINING MAXIMUM HEATER KW Duct Width (inches) x Duct Height (inches) Total Square Inches x 156 Maximum Watts per Square Inch of Duct Face Area Duct Width (feet) x Duct Height (feet) Total Square Feet x Maximum KW per Square Foot of Duct Face Area STATIC PRESSURE DROP INCHES OF WATER ,000 1,200 1,400 1,600 1,800 2,000 2,200 AIR VELOCITY F.P.M. 1, 2, 3 and 4 the number of rows of heater coils When the number of rows of heater coils is unknown, assume 4 MINIMUM AIR VELOCITIES WATTS PER SQUARE FOOT, DUCT AREA 22,000 20,000 18,000 16,000 14,000 12,000 10,000 8,000 6,000 4,000 2,000 General A. The minimum airflow in a duct heater is directly related to the inlet air temperature. Consideration must be given to both airflow across the heater and the inlet temperature. B. To calculate the watts per sq. ft. of duct area, divide the total watts required by the duct area. Example C. Duct size equals 2 ft. x 3 ft., total watts equal 20,000 watts per square foot equals 20,000 = D. If the air handling equipment is expressed in F.P.M., then a direct cross reference can be made by comparing the temperature of the air (as it enters the duct heater) to the KW rating on the table at the rated air velocity. 1. Draw a line horizontally from the watts/sq. ft. required to the inlet air temperature being used. 2. From this point of intersection on the inlet temperature line, draw a line down vertically to establish the air velocity. 3. In cases where the velocity is less than that determined from the chart, then either the velocity must be increased, the KW required must be reduced or both must be done ,000 1,200 1,400 AIR VELOCITY F.P.M. BELOW 78 F INLET AIR 78 F INLET AIR TO 90 F INLET AIR 91 F INLET AIR TO 110 F INLET AIR E. In cases where the airflow is expressed in C.F.M., convert to F.P.M. by dividing the C.F.M. by the duct area. C.F.M. = F.P.M. Duct Area _Tutco_Catalog.indd 12 3/4/11 8:46:41 AM

13 TYPICAL CONTACTOR POWER CIRCUITRY (Only power circuit shown, safety devices etc., omitted) SINGLE PHASE SINGLE PHASE SUPPLY DISCONNECTING TYPE: CONTACTOR HEATING ELEMENTS SINGLE LINE BREAK This type would be disconnecting for 120V and 277V, providing the contactor opens the ungrounded line. Heating elements, namely those used in three phase, balanced, configurations are factory wired, as manufacturers standard in two basic configurations delta or WYE. SINGLE PHASE SINGLE PHASE SUPPLY DISCONNECTING TYPE: TWO LINE BREAK Heating power is completely disconnected by breaking both sides of the power source. All ungrounded power conductors are disconnected. THREE PHASE SINGLE PHASE SUPPLY CONTACTOR CONTACTOR HEATING ELEMENT WYE DELTA All ungrounded conductors disconnected. Both WYE and Delta configurations shown. HEATING ELEMENT WIRING CONFIGURATIONS AND PROPERTIES L1 SINGLE PHASE LINE VOLTAGE HEATING ELEMENT(S) ll1 L1 480V 480V ll2 L2 THREE PHASE L1 480V L2 480V 480V ll2 ll1 L2 L3 480V ll3 480V for illustration only L3 ll3 Element Voltage = Line Voltage THREE WIRE DELTA CONNECTION 1. Element Voltage = Line Voltage 2. Phase Currents In = ll1 = ll2 = ll3 3. Voltage measured between any two power legs (L1 to L2 etc.) should be equal to the three phase line voltage. THREE WIRE WYE CONNECTION 1. Element Voltage = Line Voltage Phase Currents In = ll1 = ll2 = ll3 3. Voltage measured between any two power legs (L1 to L2 etc.) should be equal to the three phase line voltage _Tutco_Catalog.indd 13 3/4/11 8:46:42 AM

14 BTU/H KW AMPERES CHART AMPERES BTU/H KW 120V 208V 220V 230V 240V 277V 440V 460V 480V 550V 10 / 10 / 30 / 10 / 30 / 10 / 30 / 10 / 30 / 10 / 10 / 30 / 10 / 30 / 10 / 30 / 10 / 30/ KW 3, , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , I , , , , , , , , , , , FORMULA FOR CALCULATING LINE CURRENTS AMPERES = SINGLE PHASE (1 PHASE) WATTS LINE VOLTAGE TO CONVERT "KW" TO WATTS MULTIPLY "KW" BY 1,000 THREE PHASE (3 PHASE) AMPERES = WATTS LINE VOLTAGE X 1.73 Line Voltage Factor Line Voltage x x 1.73 = x 1.73 = x 1.73 = x 1.73 = x 1.73 = x 1.73 = x 1.73 = x 1.73 = x 1.73 = _Tutco_Catalog.indd 14 3/4/11 8:46:43 AM

15 GENERAL INFORMATION We are the premier fabricator of open coil heating elements for various applications in the appliance and comfort conditioning industries. Our products have been custom designed and sold to original equipment manufacturers, wholesalers and distributors. Our reputation as a supplier of electro mechanical assemblies and sub-assemblies to major consumer products manufacturers since 1938 has been constantly upgraded through our ISO registered and state of the art research and development facility. Increasingly sophisticated technology and personnel have allowed us to hold over 30 key U.S. and foreign patents for the industry and be certified to participate in the UL client test data program (CTDP). QUALITY CONTROL Each heater is dielectrically tested at 1,000 volts plus twice the rated voltage times 120%. The resistance of all heaters is measured and must be within ± 5% of rated value. A functional electrical test is performed on every heater by applying control voltage and energizing all control circuits. DISCLAIMER Any and all Model DHB, Model DB, Model DHC, Model DC, Model DHD and Model DD duct heaters manufactured by Tutco, Inc. are not to be installed in, on, or directly attached to any equipment and further must be installed according to the installation instructions shipped with each and every duct heater. Further, Tutco, Inc. recommends a Model RMC remote panel by Tutco, Inc. for controlling each Model DHD or Model DD duct heater. WARRANTY This warranty extends only to the first purchaser (Buyer) of each new Duct Heater and or Remote Panel, and does not extend to any subsequent purchaser of any Duct Heater and/or Remote Panel. The manufacturer warrants to the Buyer that its products and components, when installed correctly according to instructions provided by manufacturer, and when properly maintained, will be free from defects in workmanship and materials for one year after installation, but not to exceed 18 months after manufacture. This warranty does not apply to defects caused by faulty installation, misuse, accident, alteration, improper care after installation, or chemical, electrical or physical abuse. If a product or component is found not to comply with this warranty, the defective product or component shall be promptly returned, freight prepaid, to the factory for examination. If the failure is due to causes other than faulty installation or Buyer abuse, we will repair, or at our option, replace the component or parts found to be defective at no charge and return to Buyer with shipping charges prepaid, and issue credit for the incoming shipping charge. The above warranty is in lieu of all other warranties, statutory or otherwise, express or implied, all other representations to the Buyer, and all other obligations or liabilities with respect to any Duct Heater and/or Remote Panel, including implied warranties of merchantability and fitness for a particular purpose, and our obligation under all such warranties shall not exceed those set forth above. No warranty or representation whatsoever, express or implied, has been made by the Manufacturer or the Distributor of the Duct Heater and/or Remote Panel which has been relied on by the Buyer. In no event shall Manufacturer be liable for any direct or indirect damages other than as set forth above or for loss of profits or other indirect, special incidental or consequential damages _Tutco_Catalog.indd 15 3/4/11 8:46:44 AM

16 500 Gould Drive Cookeville, TN Phone: (931) Fax: (931) _Tutco_Catalog.indd 16 3/4/11 8:46:46 AM