Electric Duct Heaters - mcaair.commcaair.com/docs/TutcoDuctHeaterCatalog2011.pdf · 3 | BASIC HEATER INCLUDES: † Meets disconnecting contactor requirements † 50 or 60 HZ design

Electric Duct Heaters

12541_Tutco_Catalog.indd 112541_Tutco_Catalog.indd 1 3/4/11 8:46:01 AM3/4/11 8:46:01 AM

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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 fl ow 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 PROVIDEDWITH 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 fi le E 33341

• UL fi le E 56530

• CSA fi le LR 20609

TYPICAL APPLICATIONS:• Space heating

• Primary heating

• Secondary heating

• Auxiliary heating

• Reheating

• Multizone and variable

air volume heating


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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


• Left hand offset control box

OPTIONS:• Standard supply voltages, 120 – 480

• Standard control voltages, 24 – 277

• Single or three phase

• Staging is an option and three phase heaters

may utilize unbalanced staging

• Slip in or fl ange 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

DHB & DB SERIES

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.

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

120 1 11.5 96 4 4 36 X 36 35 X 34

208 1 19.9 96 4 4 36 X 36 35 X 34

240,277,488 1 20 96 4 4 36 X 36 35 X 34

208 3 17.2 48 3 3 36 X 36 35 X 34

240 3 19.9 48 3 3 36 X 36 35 X 34

415 3 25 35 3 3 36 X 36 35 X 34

480 3 25 35 3 3 36 X 36 35 X 34


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BASIC HEATER INCLUDES:• A disconnecting magnetic control contactor per

stage or each 48 AMP circuit within a stage


• Fan interlock

• Power terminal board

• Control terminal board

• Grounding lugs









• Staging (balanced, unless otherwise specifi ed)

• Slip in, fl ange mount, bottom mount





• Derated coils

• Vapor barrier

• Gasketed cover


DHC & DC SERIES

DESIGN LIMITATIONS – DHC & DCMultiple 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.


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BASIC HEATER INCLUDES:• 50 or 60 HZ design

• High voltage and low voltage terminal boards

to interconnect heater with remote panel

• Grounding lugs









• Staging (balanced, unless otherwise specifi ed)

• Slip in, fl ange mount, bottom mount





• Derated coils

• Vapor barrier

• Gasketed cover

ACCESSORIES:• Air fl ow switch

DHD & DD SERIES

DESIGN LIMITATIONS – DHD & DDMultiple stage heaters do not always provide full

face coverage. For multizone or full face coverage

requirements notify factory.

1. Maximum 1500 KW

2. Maximum 10' wide x 12' high

3. Minimum 8" x 6". Three phase only – minimum height 8"

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.


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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


• 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


RMC REMOTE PANELS


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BOTTOM MOUNT HEATERS:• Bottom mount, slip in or fl anged 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 fl anged 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 fl anges

• Seals door opening

• Seams are fi lled with fi ller

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

80-20 A GRADE ELEMENT WIRE:• Wire available in 80% nickel, 20% chromium

when specifi ed on all heater series

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

OPTIONS

WARNINGDO NOT ATTEMPT TO CLEAN OR SERVICE WITHOUT

DISCONNECTING ALL SOURCES OF POWER


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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 fl ow

• UL listed for 250,000 cycle operation

• Not available on bottom mount heaters

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

ACCESSORIES

WARNINGThis 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.

2 Pole Magnetic Contactor

3 Pole Magnetic Contactor

2 Pole Mercury Contactor

Electronic Step Controller


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AIR FLOW SWITCH:• Prevents heater from being energized when the fan is not on

• UL required

• Non adjustable airfl ow switch (shown) requires a minimum of

.07"WC pressure

• Adjustable airfl ow 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 specifi ed

Air Flow Switch

Control Transformer Power Fusing

Fuse Block


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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 fi eld 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

PILOT LIGHTS:• Side panel installation for indicating the following heater

conditions:

• Heater energized

• Step energized

• Air fl ow switch open

• Pilot light control voltages must be 24 or 120 volts

ACCESSORIES (cont.)

Terminal Blocks

Terminal Blocks

Timed Delay RelayPilot Light


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PRESSURE ELECTRIC SWITCHES:• Provide an interlock when basic control system is pneumatic

• Wired to close on pressure rise

• Not factory set. Will require fi eld adjustments to specifi c 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 fi nest 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

S.S.R.

PE Switch

Disconnect Switch


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22,000

20,000

18,000

16,000

14,000

12,000

10,000

8,000

6,000

4,000

2,000

200 400 600 800 1,000 1,200 1,400

WA

TT

S P

ER

SQ

UA

RE

FO

OT,

DU

CT

AR

EA

AIR VELOCITY – F.P.M.

BELOW 78°F INLET AIR78°F INLET AIR TO 90°F INLET AIR

91°F INLET AIR TO 110°F INLET AIR

PRESSURE DROP THROUGH HEATER

200

.16

.14

.12

.10

.08

.06

.04

.02

400 600 800 1,000 1,200 1,400 1,600 1,800 2,000 2,200

STA

TIC

PR

ES

SU

RE

DR

OP

– IN

CH

ES

OF

WA

TE

RAIR VELOCITY – F.P.M.

1, 2, 3 and 4 – the number of rows of heater coilsWhen the number of rows of heater coils is unknown, assume 4

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 22.464

Maximum KW per Square Foot of Duct Face Area

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

6 = 3333

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.

E. In cases where the airflow is expressed in C.F.M., con-

vert to F.P.M. by dividing the C.F.M. by the duct area.

C.F.M.

Duct Area = F.P.M.

MINIMUM AIR VELOCITIES

TECHNICAL DATA


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TYPICAL CONTACTOR POWER CIRCUITRY(Only power circuit shown, safety devices etc., omitted)

TWO LINE BREAK

Heating power is completely disconnected by breaking both sides of the power source. All ungrounded power conductors are disconnected.

All ungrounded conductors disconnected. Both WYE and Delta configurations shown.

DISCONNECTING TYPE:

SINGLE PHASE

THREE PHASE

DELTAWYE

SINGLE PHASE SUPPLY

HEATING ELEMENT

CONTACTOR

SINGLE PHASE SUPPLY

CONTACTOR

SINGLE PHASE SUPPLY

HEATING ELEMENTS

CONTACTOR

DISCONNECTING TYPE:

SINGLE LINE BREAK

This type would be disconnecting for 120V and 277V, providing the contactor opens the ungrounded line.

SINGLE PHASE

Heating elements, namely those used in three phase, balanced, configurations are factory wired, as manufacturers standard in two basic configurations delta or WYE.

HEATING ELEMENT WIRING CONFIGURATIONS AND PROPERTIES

HEATING ELEMENT(S)

THREE WIRE DELTA CONNECTION

1. Element Voltage = Line Voltage2. 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 1.732. 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.

LINE VOLTAGE

L1

480V for illustration only

lL1 lL1

lL3 lL3

lL2

lL2L1

480V

480V

480V480V

480V

480V

L2

L3

L1

L2

L3

L2

THREE PHASESINGLE PHASE

Element Voltage = Line Voltage


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AMPERES

BTU/H KW

120V 208V 220V 230V 240V 277V 440V 460V 480V 550V KW

10 10 30 10 30 10 30 10 30 10 10 30 10 30 10 30 10 30

3,413 1 8.3 4.8 2.8 4.5 2.6 4.3 2.5 4.2 2.4 3.6 2.3 1.3 2.2 1.3 2.1 1.2 1.8 1.1 1 6,826 2 16.7 9.6 5.5 9.1 5.2 8.7 5.0 8.3 4.8 7.2 4.5 2.6 4.3 2.5 4.2 2.4 3.6 2.1 2 10,239 3 25.0 14.4 8.3 13.6 7.9 13.0 7.5 12.5 7.2 10.8 6.8 3.9 6.5 3.8 6.2 3.6 5.4 3.2 3 13,652 4 33.3 19.2 11.1 18.2 10.5 17.4 10.0 16.6 9.6 14.4 9.1 5.2 8.7 5.0 8.3 4.8 7.2 4.2 4 17,065 5 41.7 24.0 13.9 22.7 13.1 21.7 12.6 20.8 12.0 18.1 11.4 6.6 10.9 6.3 10.4 6.0 9.1 5.3 5 20,478 6 50.0 28.9 16.6 27.2 15.7 26.0 15.1 25.0 14.4 21.7 13.6 7.9 13.0 7.5 12.5 7.2 10.9 6.3 6 23,891 7 58.3 33.7 19.4 31.8 18.3 30.4 17.6 29.1 16.8 25.3 15.9 9.2 15.2 8.8 14.6 8.4 12.7 7.4 7 27,304 8 66.6 38.5 22.2 36.3 21.0 34.7 20.1 33.3 19.2 28.9 18.2 10.5 17.4 10.0 16.6 9.6 14.5 8.4 8 30,717 9 75.0 43.3 24.9 40.9 23.6 39.1 22.6 37.4 21.6 32.5 20.4 11.8 19.5 11.3 18.7 10.8 16.3 9.5 9 34,130 10 83.3 48.1 27.7 45.4 26.2 43.4 25.1 41.6 24.0 36.1 22.7 13.1 21.7 12.5 20.8 12.0 18.1 10.5 10 37,543 11 91.6 52.9 30.5 49.9 28.8 47.7 27.6 45.8 26.4 39.7 25.0 14.4 23.9 13.8 229 13.2 19.9 11.6 11 40,956 12 100.0 57.7 33.2 54.5 31.4 52.1 30.1 49.9 28.8 43.3 27.2 15.7 26.0 15.0 25.0 14.4 21.7 12.6 12 44.369 13 108.3 62.5 36.0 59.0 34.1 56.4 32.6 54.1 31.2 46.9 29.5 17.0 28.2 16.3 27.0 15.6 23.5 13.7 13 47,782 14 116.6 67.3 38.8 63.6 36.7 60.8 35.1 58.2 33.6 50.5 31.8 18.3 30.4 17.5 29.1 16.8 25.3 14.7 14 51,195 15 125.0 72.1 41.6 68.1 39.3 65.1 37.7 62.4 36.0 54.2 34.1 19.7 32.6 18.6 31.2 18.0 27.2 15.8 15 54,608 16 133.3 76.9 44.3 72.6 41.9 69.4 40.2 66.6 38.4 57.8 36.3 21.0 34.7 20.0 33.3 19.2 29.0 16.8 16 58,021 17 141.6 81.8 47.1 77.2 44.5 73.8 42.7 70.7 40.8 61.4 38.6 22.3 36.9 21.3 35.4 20.4 30.8 17.9 17 61,434 18 150.0 86.5 49.9 81.7 47.2 78.1 45.2 74.9 43.2 65.0 40.9 23.6 39.1 22.5 37.4 21.6 32.6 18.9 18 64,847 19 158.3 91.4 52.6 86.3 49.8 82.5 47.7 79.0 45.6 68.6 43.1 24.9 41.2 23.8 39.5 22.8 34.4 20.0 19 68,260 20 166.6 96.2 55.4 90.8 52.4 86.8 50.2 83.2 48.0 72.2 45.4 26.2 43.4 25.0 41.6 24.0 36.2 21.0 20 71,673 21 174.9 101.0 58.2 95.3 55.0 91.1 527 87.4 50.4 75.8 47.7 27.5 45.6 26.3 43.7 25.2 38.0 22.1 21 75,086 22 183.3 105.8 60.9 99.9 57.6 95.5 55.2 91.5 52.8 79.4 49.9 28.8 47.7 27.5 45.8 26.4 39.8 23.1 22 78,499 23 191.6 110.6 63.7 104.4 60.3 99.8 57.7 95.7 55.2 83.0 522 30.1 49.9 28.8 47.8 27.6 41.6 24.2 23 81,912 24 200.0 115.4 66.5 109.0 62.9 104.2 60.2 99.8 57.6 86.6 54.5 31.4 52.1 30.0 49.9 28.8 43.4 25.2 24 85,325 25 208.3 120.2 69.3 113.5 65.5 108.5 62.8 104.0 60.0 90.3 56.8 32.8 54.3 313 52.0 30.0 45.3 26.3 25 88,738 26 218,6 125.1 72.0 118.0 68.1 112.8 65.3 108.2 62.4 93.9 59.0 34.1 56.4 32.5 54.1 31.2 47.1 27.3 26 92,151 27 225.0 129.9 74.8 1226 70.7 117.2 67.8 112.3 64.8 97.5 61.3 35.4 58.6 33.8 56.2 32.4 48.9 28.4 27 95,564 28 233.3 134.7 77.6 127.1 73.4 121.5 70.3 116.5 67.2 101.1 63.6 36.7 60.2 35.0 58.2 33.6 50.7 29.4 28 98,977 29 241.6 139.5 80.3 131.7 76.0 125.9 72.8 120.6 69.6 104.7 65.8 38.0 63.0 36.3 60.3 34.8 52.5 30.5 29 102,390 30 250.0 144.3 83.1 136.2 78.6 130.2 75.3 124.8 720 108.3 68.1 39.3 65.1 37.5 62.4 36.0 543 31.5 30 105,803 31 258.3 149.1 85.9 140.7 81.2 134.5 77.8 129.0 74.4 111.9 70.4 40.6 67.3 38.8 64.5 37.2 56.1 32.6 31 109,216 32 266.6 153.9 88.6 145.3 83.8 138.9 80.3 133.1 76.8 115.5 72.6 41.9 69.4 40.0 66.6 38.4 57.9 33.6 32 112,629 33 275.0 158.7 91.4 149.8 86.5 143.2 82.8 137.3 79.2 119.1 74.9 43.2 71.6 41.3 68.6 39.6 59.7 34.7 33 116,042 34 283.3 163.5 94.2 154.4 89.1 147.6 85.3 141.4 81.6 122.7 77.2 44.5 73.8 42.5 70.7 40.8 61.5 35.7 34 119,455 35 291.7 168.4 97.0 159.0 91.7 151.9 87.9 145.6 84.0 126.4 79.5 45.9 76.0 43.8 72.8 420 63.4 36.8 35 122,868 36 300.0 173.2 99.7 163.4 94.3 156.2 90.4 149.8 86.4 130.0 81.7 47.2 78.1 15.0 74.9 43.2 652 37.8 36 126,281 37 308.3 178.0 102.5 168.0 96.9 160.6 92.9 153.9 88.8 133.6 84.0 48.5 80.3 46.3 77.0 44.4 67.0 38.9 37 129,694 38 316.7 182.8 105.3 172.5 99.6 164.9 95.4 158.I 91.2 137.2 86.3 49.8 82.5 47.5 79.0 45.6 68.8 39.9 38 133,107 39 325.0 187.6 108.0 177.1 102.2 169.3 97.9 162.2 93.6 140.8 88.5 51.1 84.6 48.8 81.1 46.8 70.6 41.0 39 136,520 40 333.3 192.4 110.8 181.6 104.8 173.6 100.4 166.4 96.0 144.4 90.8 52.4 86.8 50.0 83.2 48.0 72.4 42.0 40 139,993 41 341.7 197.2 113.6 186.1 107.4 177.9 102.9 170.6 98.4 148.0 93.1 53.7 89.0 51.3 85.3 49.2 742 43.1 41 143,346 42 350.0 202.0 116.3 190.7 110.0 182.3 105.4 174.7 100.8 151.6 95.3 55.0 91.1 52.5 87.4 50.4 76.0 44.1 42 146,759 43 358.3 206.8 119.1 195.2 112.7 186.6 107.9 178.9 103.2 155.2 97.6 56.3 93.3 53.8 89.4 51.6 77.8 45.2 43 150,172 44 366.7 211.7 121.9 199.8 115.3 191.0 110.4 183.0 105.6 158.8 100.0 57.6 95.5 55.0 91.5 52.8 79.6 46.2 44 153,585 45 375.0 216.5 124.7 204.3 117.9 195.3 113.0 187.2 108.0 162.5 102.2 59.0 97.7 56.3 93.6 54.0 81.5 47.3 45 156.998 46 383.3 221.3 127.4 208.8 120.5 199.6 115.5 191.4 110.4 166.1 104.4 60.3 99.8 57.5 95.7 55.2 83.3 48.3 46 160,411 47 391.7 226.1 1302 213.4 123.1 204.0 118.0 195.5 112.8 169.7 106.7 61.6 102.0 58.8 97.8 56.4 85.1 49.4 47 163,824 48 400.0 230.9 133.0 217.9 125.8 208.3 120.5 199.7 115.2 173.3 109.0 62.9 104.2 60.0 99.8 57.6 86.9 50.4 48 167,237 49 408.3 235.7 135.7 2225 128.4 212.7 123.0 203.8 117.6 176.9 111.3 64.2 106.3 61.3 101.9 58.8 88.7 51.5 49 170,650 50 416.6 240.5 138.5 227.0 131.0 217.0 125.5 208.0 120.0 180.5 113.5 65.5 108.5 62.5 104.0 60.0 90.5 52.5 50

/ / / / / / / / / // / / / / / / /

TO CONVERT "KW" TO WATTSMULTIPLY "KW" BY 1,000

FORMULA FOR CALCULATING LINE CURRENTS

Line Voltage Factor Line Voltage x 1.73

208 x 1.73 = 359.8 220 x 1.73 = 380.6 230 x 1.73 = 397.9 240 x 1.73 = 415.2 440 x 1.73 = 761.2 460 x 1.73 = 795.8 480 x 1.73 = 830.4 550 x 1.73 = 951.5 600 x 1.73 = 1038.0

WATTS

LINE VOLTAGE X 1.73

THREE PHASE (3 PHASE)SINGLE PHASE (1 PHASE)

AMPERES =WATTS

LINE VOLTAGEAMPERES =

BTU/H–KW–AMPERES CHART


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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 14001 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 certifi ed to participate in the UL client test data program (CTDP).

QUALITY CONTROLEach 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.

DISCLAIMERAny 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.

WARRANTYThis warranty extends only to the fi rst 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 fi tness 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

profi ts or other indirect, special incidental or consequential damages.


500 Gould Drive • Cookeville, TN 38506

Phone: (931) 432-4141 • Fax: (931) 432-4140

www.tutco.com


Documents

Electric Duct Heaters - mcaair.commcaair.com/docs/TutcoDuctHeaterCatalog2011.pdf · 3 | BASIC HEATER INCLUDES: † Meets disconnecting contactor requirements † 50 or 60 HZ design