RenewAire EK Series Instruction manual

FOR COMMERCIAL
INDOOR APPLICATIONS
EK SERIES
RENEWAIRE.COM
INSTALLATION, OPERATION & MAINTENANCE MANUAL
ELECTRIC DUCT HEATER

ELECTRIC DUCT HEATER
RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.4499
2
Electric Duct Heater info ...... 2-7
Installation......................... 8-20
Start-up................................. 21
Maintenance.....................22-23
TABLE OF CONTENTS
ELECTRIC DUCT HEATER
INFO
ELECTRIC DUCT HEATER CONFIGURATION CHART
MODEL NUMBER
Heater Type
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
"EK "= Electric Heater (Standard)
DIGIT NUMBER
Digits 1 - 2:
Width in Inches (see Restriction 1)
Digits 4 - 5:
08-99
Mount
Digit 11:
"S" = Slip In (Standard)
"F = Flanged
Element Style
Digit 12:
"C" = Open Coil (Standard)
Element Material
Digit 13:
"C" = 60-20-20 Ni-Cr-Fe with Nickel Plate Terminal Pins (Standard)
"A" = 80-20 Ni-Cr with Stainless Steel Terminal Pins
Airflow Orientation
Digit 14:
"H" = Horizontal (Standard)
"V" = Vertical
Control Box Offset
Digit 15:
"L" = Left Hand (Standard)
"R" = Right Hand
*NOTES:
Digit 3 is not used in this model.
All heaters come with standard features: Disconnect Switch, Air Flow Switch (non adjustable), Control Transformer
Descriptions of feature and options are found in the installation and operation manual.
Restrictions:
1: Width inches entered as a whole number.
2: Height inches entered as a whole number.
3: Heater density should be less than 30kW/ft². DENSITY= HEATER CAPACITY (kW) < 30
(W" x H")/144
4: Heater capacity kW entered as a whole number.
5: Formulas for calculating kW and temperature rise: kW = CFM x ΔT ΔT = kW x 3150
3150 CFM
7: Voltage Codes "1" & "9" only available with Phase Code "1" (Single-Phase).
8: Voltage Codes "4" & "8" only available with Phase Code "3" (Three-Phase).
9: Power Fusing Code "F" required when amperage is >48A. (based on kW and voltage)
10: Control Type Code "D" only available with Stage Code "1" & "2".
11: Control Type Code "E" only available with Stage Code "4".
12: Control Type Code "S" & "V" only available with Stage Code "1", unless amperage is greater than or equal to 96A, then Stage Code "4" is automatically selected.
Voltage (see Restrictions 7 & 8)
Digit 18:
"1" = 120V
"2" = 208V
"3" = 240V
"4" = 480V
"8" = 600V
"9" = 277V
Phase
Digit 19:
"1" = Single-Phase
"3" = Three-Phase
Stage
Digit 21:
"1" = Single (Standard)
"2" = 2-Stage
"4" = 4-Stage
Control Voltage
Digit 22:
"S" = 24VAC
Time Delay
Digit 24:
"-" = None (Standard)
-
Height in Inches (see Restriction 2)
Digits 6 - 7:
08-99
Capacity in kW (see Restrictions 3, 4 & 5)
Digits 8 - 10:
001-175
Control Box Recessed
Digit 16:
"-" = None (Standard)
"R" = Recessed 1"
Power Fusing (see Restriction 9)
Digit 20:
"-" = None
"F" = Fusing
Control Type (see Restrictions 10, 11 & 12)
Digit 23:
"D" = Duct Thermostat with Sensor (Standard)
"E" = Electronic Step Control with Sensor
"S" = SCR (For BAS System)
"V" = SCR with Analog Sensor (0-10Vdc)
Pilot Light
Digit 25:
"N" = None (Standard)
"L" = Light
Control Box Dust Tight
Digit 17:
"-" = None (Standard)
"D" = Dust Tight
ELECTRIC POST HEAT
CONFIGURATION CODE CHART
ABOUT RENEWAIRE
For over 30 years, RenewAire has been a pioneer in enhancing indoor air quality (IAQ) in commercial
and residential buildings of every size. This is achieved while maximizing sustainability through our fifth-
generation, static-plate, enthalpic-core Energy Recovery Ventilators (ERVs) that optimize energy efficiency,
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resulting in significant energy savings. Our ERVs are competitively priced, simple to install, easy to use and
maintain and have a quick payback. They also enjoy the industry’s best warranty with the lowest claims due
to long-term reliability derived from innovative design practices, expert workmanship and Quick Response
Manufacturing (QRM).
As the pioneer of static-plate core technology in North America, RenewAire is the largest ERV producer in the
USA. We’re committed to sustainable manufacturing and lessening our environmental footprint, and to that
end our Madison, WI plant is 100% powered by wind turbines. The facility is also one of the few buildings
worldwide to be LEED and Green Globes certified, as well as having achieved ENERGY STAR Building status.
In 2010, RenewAire joined the Soler & Palau (S&P) Ventilation Group in order to provide direct access to the
latest in energy-efficient air-moving technologies. For more information, visit: renewaire.com.

ELECTRIC DUCT HEATER
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DEFINITIONS FOR CONFIGURATION CHART
Heater Type:
EK - (Standard) heater 8" - 99" height and
width.
Width:
W- Width of duct ID in inches. For slip-in type
the W dimension is undersized by ¼" to allow
heater to slip into ductwork.
Range 8" - 99"
Height:
H- Height of duct ID in inches. For slip-in type
the H dimension is undersized by 1/16" to allow
heater to slip into ductwork.
Range 8" - 99"
Capacity:
KW - Kilowatt rating of heater. Determined by
airflow (CFM) and temperature rise (rT).
Range 1 - 175 KW
Mount:
Slip-in (Standard) - heater is installed through
opening cut into side of duct and the control box
is attached to duct.
Flanged (Option) - heater is installed between
two sections of flanged duct and bolted in place.
Element Style:
Open Coil (Standard) - open coil resistance
wire. Used in most applications.
Element Material:
60-20-20 NI-CR-FE with nickel plate terminal
pins (Standard) - standard “C” grade element
wire. 60% nickel, 20% chromium, 20% iron.
80-20 NI-CR with stainless steel terminal
pins (Option) - premium “A” grade element wire.
80% nickel, 20% chromium.
Airflow Orientation:
Horizontal (Standard) - heater installed where
airflow in ductwork is horizontal through the heater.
Vertical (Option) - heater installed where airflow
in ductwork is vertical through the heater.
Vertical up and down airflow available in EK series
ELECTRIC DUCT HEATER
INFO
Control Box Offset:
Left Hand (Standard) - the control panel is
offset to the left side of the heating elements as
determined when looking into the control box.
Right Hand (Option) - the control panel is offset
to the right side of the heating elements as
determined when looking into the control box.
Control Box Recessed (Option):
Recessed 1" - Control box is designed
to extend 1" beyond internally insulated
duct. Heater element width construction is
automatically reduced by 1". Heater element
height construction is automatically reduced by
2". Recess depth dimension is 1". Only allowed
for internally insulated ducts of 1" insulation
thickness.
Control Box Dust Tight (Option):
Dust Tight - Compression type gasket installed
on control box flanges to seal door opening.
Control box seams are filled to prevent dust
intrusion. Typically specified when local code
requires it.
Voltage and Phase:
Single Phase - 120V, 208V, 240V, 277V
3-Phase - 208V, 240V, 480V, 600V
Power Fusing:
Required by UL and NEC if amperage is over
48A. Otherwise is an option.
Stage:
Single Stage (Standard) - All heating elements
are energized simultaneously. SCR control is
always single stage.
2-Stage (Option) - Heating capacity is divided
into two sections. Half of the heating capacity
can be energized when less heating is required.
Both stages are energized when full heating is
required. Can be for on/off control.
4-Stage - Heating capacity is divided into four
sections. 4-stage for Electronic Step Control only.
Control Voltage:
24 VAC (Standard) - secondary voltage
Definitions contiinued on page 4.

ELECTRIC DUCT HEATER
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Control Type:
Duct Thermostat with sensor - standard
thermostat with on/off control. Sensor is duct
mounted. Thermostat must be programmed by
installer for the number of stages. (Standard)
Electronic Step Control - provides sequencing
control in steps of 4 for duct heater. Converts
analog input signal into discrete steps or stages.
As an example, if you have a 4-stage heater the
step controller would be 4-stage. For an analog
signal greater than 4Vdc the first stage would
energize, for an analog signal greater than 6Vdc
the first and second stages would energize, for
an analog signal greater than 8Vdc the first,
second, and third stages would energize, and
for an analog signal at 10Vdc all stages would
energize.
Silicon Controlled Rectifier (SCR) - 100%
step-less modulating control. Accepts 0-10Vdc
or 4-20mA as control signal. Utilizes solid state
relays (SSR) to switch current to the heating
elements, on a time-proportioned basis.
Silicon Controlled Rectifier (SCR) Vernier -
When SCR control is selected and the heater is
greater than 96A then an SCR vernier control
is implemented. This combines an SCR with
4-stage electronic step control as a cost
effective method for providing modulating
control on heaters greater than 96A.
An SSR is an electronic switching device similar
to an electromechanical relay (contactor) but
has no moving parts which allows very fast
switching of high current loads without arcing
or wearing out. A heater with an SCR controller
must be installed in such a way as to provide
good ventilation to the heat sink so that the life
of the SSR is prolonged. Over-heating of an SSR
causes it to fail so the heater must be installed
such that the heat sink is positioned either
DEFINITIONS FOR CONFIGURATION CHART
ELECTRIC DUCT HEATER
INFO
vertically on the side of the control cabinet or on
top of the control cabinet—never on the bottom.
Pilot Light (Option):
Light to indicate heater energized. Control
voltage same as transformer secondary voltage
(24 VAC).
Air Flow Switch: (Standard)
Non-adjustable pressure switch that prevents
the heater from being energized when no or
very low air flow is present through the heater.
Minimum air flow pressure is 0.05 in.w.c + .02.
Auto Reset: (Standard)
Automatic reset limit switch for primary
over-temperature protection. Required by UL.
Manual Reset: (Standard)
Manual reset limit switch for secondary
over-temperature protection. Required by UL.
Disconnect Switch: (Standard)
Non-fused interlocking switch mounted in the
door of the heater control box. Must be turned
off to open door on control box. Interrupts power
to the heater when turned off.
Terminal Block: (Standard)
Low voltage control terminal block included.
Ground Lug: (Standard)
Connection point for grounding field connected
line voltage.
All heaters are designed for zero clearance.
Control box is constructed of galvanized steel.
Control box has hinged access door with
interlocking disconnect switch.
All heaters are UL and cUL listed and tested in
accordance with Standard UL1996.
-

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FOR THE MOST COMPLETE AND CURRENT INFORMATION VISIT RENEWAIRE.COM
OPTIONS & ACCESSORIES
Specifications may be subject to change without notice.
0
25
50
75
100
125
150
175
200
02500 5000 7500 10000 12500
HEATER CAPACITY
-kW
AIRFLOW -CFM
EK Series Heater Capacity
SAFE OPERATING
RANGE
EK SERIES HEATER CAPACITY
ELECTRIC DUCT HEATER SPECIFICATIONS
Heater Type:
Electric Duct Heater
Typical KW Range:
1–175 kW
Standard Features:
A disconnecting magnetic control contactor per
stage or each 48 Amp circuit within a stage
Open-coil element
Staged on/off
Control terminal board
Grounding lugs
Automatic limit switch for primary over-
temperature protection
Manual reset limit switch for secondary over-
temperature protection
Non-adjustable airflow switch
Standard control transformer - 24 VAC
Disconnect switch
Duct thermostat with sensor for on/off control
60-20-20 (Ni/Cr/Fe) C Grade element wire with
nickel-plated terminals
Slip-in mount
No left/right hand
Vertical up/down flow
Voltages & Phase:
Single phase - 120, 208, 240, 277
Three phase - 208, 240, 480, 600
Control Voltage:
24 VAC
Dimensions:
Minimum - 8" x 8" (W x H)
Maximum - 99" x 99" (W x H)
Options:
Flange mount
80-20 (Ni/Cr) A Grade element wire with
stainless steel terminals
Recessed control box 1"
Gasketed cover - dust tight
Power fusing, standard for heaters drawing more
than 48 Amps
2-stage
Electronic step controller (4-stage)
SCR (up to 96 Amps)
SCR Vernier (over 96 Amps)
Pilot light
Accessory:
Room thermostat
Room/duct thermostat-sensor kit for SCR control
Note: Electric duct heater designed for indoor ductwork installation only.
SERIESEK Electric Duct Heater (1-175 kW) Accessory
Download specification at:
renewaire.com/specifications
FLIPPABLE
CAPABILITIES
Unique to the EK series, this unit has the ability
to flip 180°. Additionally, EK heaters features
both vertical up and vertical down airflow.
0
0.02
0.04
0.06
0.08
0.1
0.12
0.14
0.16
0.18
02004006008001000120014001600180020002200
PRESSURE DROP THROUGH HEATER
Static Pressure Drop - Inches of Water
Air Velocity - FPM (1, 2, 3 and 4 - the number of rows of heater coils)
When the number of rows of heater coils is unknown, assume 4.
1
2
3
4
PRESSURE DROP THROUGH HEATER

ELECTRIC DUCT HEATER
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ELECTRIC DUCT HEATER
INFO
NOTES: 1. W and H determined by duct size A. For slip-in
W = Duct width minus 1/4 inch H = Duct height minus 1/16 inch
B. flange mount
W and H=Duct size
2. U = (W+H Up to 60"=4 7/8), (61" and over U=6")
(W greater than 36" U=6")
3. BD = 4 1/4, 6, 8 1/2, or 10 1/4 depth of control box depends on the
components required and size of power entry holes
4. Z = (H+2" standard for slip in) (H+4" for flange mount)
5. T = 1" standard 6. M = 1" standard 7. Q = (12" minimum) Size depends on required components.
Consult factory for dimensions
8. F = 9/16" for slip-in type
1" for flange mount
9. R = 1 1/2" when using 4 7/8" U dimension
15/16" when using 6" U dimension
10. N = Q minus R and U
NOTE: R and N dimensional values exchange position for right hand offset.
500 Gould Drive, Cookeville, TN 38506
Phone: [phone] • 1 [phone] • Fax: [phone]
www.tutco.com
TECHNICAL DATA
®
ITEM QTY SERIES KW PH VOLTS STG CTL VLT S/F KW/STG W H Q Z U BD F R N T M
1. W and H determined by duct size A. For slip-in W = Duct width minus 1/4 inch H = Duct height minus 1/16 inch B. flange mount W and H=Duct size 2. U = (W+H Up to 60"=4 7/8), (61" and over U=6") (W greater than 36" U=6") 3. BD = 4 1/4, 6, 8 1/2, or 10 1/4 depth of control box depends on the components required and size of power entry holes
4. Z = (H+2" standard for slip in) (H+4" for flange mount) 5. T = 1" standard 6. M = 1" standard 7. Q = (12" minimum) Size depends on required components. Consult factory for dimensions 8. F = 9/16" for slip-in type 1" for flange mount 9. R = 1 1/2" when using 4 7/8" U dimension 15/16" when using 6" U dimension 10. N = Q minus R and U
Note: R and N dimensional values exchange position for right hand offset.
FORMULAS FOR FIGURING KW AND TEMPERATURE RISE The following fomula may be used to determine the approximate total KW required when the CFM (air volume) and desired temperature rise are known: KW =
DETERMINING THE TEMPERATURE RISE OF A DUCT HEATER The following formula may be used to determine the approximate temperature rise of a duct heater when the KW and CFM are known: T.R. =
CFM X T.R.
3150
KW X 3150
CFM
R
R
F
F
W
W
M*
M*
T*
T*
U
U
Q*
Q*
BD*
BD*
Z*
Z*
N
N
OFFSET LEFT
STANDARD
OFFSET RIGHT
OPTIONAL
H
H
R
R
F
F
W
W
M*
M*
T*
T*
U
U
Q*
Q*
BD*
BD*
Z*
Z*
N
N
OFFSET LEFT
STANDARD
OFFSET
RIGHT
OPTIONAL
H
H
TYPE S SLIP-IN
TYPE F FLANGE MOUNT
= Dimensions do not include allowance for
control box cover. Control box cover will be larger than the control box.
*
PRODUCT DIMENSIONS ELECTRIC DUCT HEATER
ABBREVIATIONS W Width H Height

ELECTRIC DUCT HEATER
71.800.627.4499 INSTALLATION, OPERATION AND MAINTENANCE MANUAL RENEWAIRE.COM
INSTALLATION
PLANNING
YOUR INSTALLATION
SIZING AN ELECTRIC DUCT HEATER
An electric duct heater can be sized from the
following information:
• Duct Width (W") and Duct Height (H")
• Heater voltage and phase
• Heater Capacity rating (kW)
• Or Design Air Flow (CFM) and
• Desired Temperature Rise (r°F)
AMPERAGE DRAW
Any electric duct heater with line current over 48
amps automatically receives fusing per UL and
NEC requirements. Electric duct heaters over 48
amps are subdivided into loads less than 48 amps.
Formula for calculating line current are:
Single Phase: Amps = Watts/Line Voltage
Three Phase: Amps = Watts/(Line Voltage x 1.73)
To convert kW to Watts multiply kW by 1000
DETERMINING MAXIMUM HEATER KW
Maximum Watts per Sq. In. of Duct Area
Duct width (inches) x duct height (inches) = duct watts total sq. in.
Max W = X w x duct area in2
in2
For EK, X= 208.33 w
in2
Maximum kw for Sq. Ft. of Duct Area
Duct width (feet) x duct height (feet) = duct area total ft2
Max W = X kW x duct area ft2
ft2
For EK, X= 30 kW
ft2
KW AND TEMPERATURE RISE
The following formula may be used to determine
the approximate total kW required when the CFM
(air volume) and desired temperature are known:
kW = CFM x rT
3150
DUCT HEATER TEMPERATURE RISE
The following formula may be used to determine
the approximate temperature rise of a duct heater
when the kW and CFM are known:
rT = KW x 3150
CFM

ELECTRIC DUCT HEATER
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INSTALLATION
Note: Minimum airflow must be maintained at any point over the face of the heater
Note: Observe at least one complete heating cycle to ensure that cycling of the safety limit controls does not
occur before leaving the installation.
MINIMUM AIR VELOCITIES
The minimum uniform airflow in a duct heater is directly related to the inlet air temperature. Consideration
must be given to both airflow across the heater and inlet air temperature, (shown below).
1. To calculate the kilowatts per sq. ft. of duct area, divide the total kilowatts required by the duct area.
EXAMPLE: Duct Size = 2ft. x 3ft.
Total kilowatts = 20
KW/Sq. Ft. = 20 = 3.333
6
2. If the air handler equipment is expressed in FPM 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 chart of
rated velocity.
a. Draw a line horizontally from the KW/Sq. Ft. required to the inlet air temperature being used.
b. From this point of intersection on the Inlet Air Curve, draw a line down vertically to establish the
air velocity.
c. The velocity should never be lower than the velocity as determined from the chart. In cases where
this is not true, the velocity must be increased or the KW required must be reduced.
3. In cases where the air handling equipment is expressed in CFM then convert to FPM by dividing the
CFM by the duct area.
EXAMPLE: FPM = CFM
Duct Area

ELECTRIC DUCT HEATER
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INSTALLATION
PLANNING
YOUR INSTALLATION
Heater control boxes must be
completely accessible and
located to provide ventilation at
all times.
CAUTION
Do not “Bank” heaters (side
by side).If greater capacity is
required, proportion smaller
heaters in separate runouts.
CAUTION
The air duct should be installed in
accordance with the Standards
of the National fire Protection
Agency for the Installation of
Air-Conditioning and Ventilating
Systems (Pamphlet No. 90A)
and Warm-Air Heating and Air-
Conditioning Systems (Pamphlet
No. 90B).
CAUTION
PLACEMENT OF THE ELECTRIC DUCT HEATER
• The information and instructions in this sheet apply to Duct Heater models for zero clearance
installation in ducts.
• The Duct Heaters are approved for use Post ERVs with heat pumps, air conditioners, or other forced air
systems. They may be controlled by contactors, relays, sequencers or solid state devices.
• The Duct Heaters are prewired, have voltage ratings to 600 volts, both single phase and three phase.
• The Duct Heaters are furnished with integral controls.
GENERAL
Inspect heater for any possible shipping damage. Check all insulators for breakage and inspect heater
element wire for any deformation that could cause a short circuit or ground. Make sure all fasteners are
tight.
Electrical connections such as pressure terminals should be checked for tightness.
INSTALLATION
For safe operation and best performance, the following installation procedures must be adhered to.
Heaters may be installed in the sides of either horizontal or vertical ducts but never in the top or bottom of
a horizontal duct. Vertical up and down airflow available in EK series.
1. Install a heater a minimum of (4) feet from heat pumps or central air conditioners at least 4 feet
downstream from an air handler.
2. At least 2 feet either side of an elbow or turn.
3. At least 4 feet from any canvas duct connector or transition section for change in duct size.
4. At least 4 feet downstream from an air filter.
5. At least 4 feet upstream from a humidifier.
Disclaimer
Model EK duct heaters offered by RenewAire 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.
Refer to Page 9 for: duct and air velocity requirements.

ELECTRIC DUCT HEATER
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INSTALLATION INSTRUCTIONS
INSTALLATION
F1 Slip-In Heater F2 Flange Heater
See Figure F3 for examples of some common installation approaches (flippable EK series only).
F3 Common Installation Approaches
To install a slip-in heater Figure F1, cut an opening, as required in the side of the duct. Slide heater in
the duct using control box as template to mark the mounting screw holes. Remove unit and drill mounting
holes. Mount unit to duct with sheet metal screws. Connect high and low voltage supplies along with fan
interlock circuit (if no airflow switch is furnished). Larger heaters may require hangers.
To install a flange type heater Figure F2, insert heater between two sections of flanged duct and bolt in
place. For additional strength, the duct flange should be doubled as shown in the figure. Large heaters
may require hanger straps. Connect high and low voltage supplies along with fan interlock circuit (if no
airflow switch is furnished).
ELECTRICAL REQUIREMENTS
Refer to general wiring diagram on pages 13-14. Each heater also has its specific wiring schematic label
on the inside cover of the heater control box.
WRAPPER
SLIP-IN
CONSTRUCTION
SHOWN
AIR DUCT
FIGURE: 4
BASE
HEATER
BASE HEATER
ROTATED 180
BASE
HEATER
BASE HEATER
FLIPPED 180°
* ONE HEATER- 4
POSITIONS
3
HORIZONTAL DUCT & AIRFLOW
with HORIZONTAL INSTALLATION
AIRFLOW
AIRFLOW
p
g
VERTICAL DUCT & AIRFLOW
AIRFLOW
AIRFLOW
* SAME HEATER- FOR
VERTICAL DUCTS
VERTICAL DUCT & AIRFLOW
* SAME HEATER -
FOR VERTICAL DUCTS
* ONE HEATER -
4 POSITIONS
HORIZONTAL DUCT & AIRFLOW
WITH HORIZONTAL INSTALLATION
S L I P - O N
CONSTRUCTION
SHOWN
AIR DUCT
B A S E
HEATER
B A S E
HEATER
BA S E HE AT E R
ROTATED 180°
BA S E HE AT E R
FLIPPED 180°
AIRFLOW
AIRFLOW
AIRFLOW
AIRFLOW
'W'
'H'
06-4141-00 REV. C E.C.O. 10438
INSTALLATION MANUAL
TUTCO DUCT HEATERS
The information and instructions in this sheet apply to Duct Heater
models for zero clearance installation in ducts.
The Duct Heaters are approved for use with heat pumps, air
conditioners, or other forced air systems. They may be controlled by
contactors, relays, sequencers or solid state devices.
The Duct Heaters are prewired, have voltage ratings to 600 volts, both
single phase and three phase.
The Duct Heaters are furnished with integral controls, except for the DD
& DHD series, which are furnished with a separate control panel for
remote mounting.
GENERAL:
Inspect heater for any possible shipping damage. Check all insulators
for breakage and inspect heater element wire for any deformation that
could cause a short circuit or ground. Make sure all fasteners are tight.
Electrical connections such as pressure terminals should be checked for
tightness.
INSTALLATION:
For safe operation and best performance, the following installation
procedures must be adhered to.
Heaters may be installed in the sides of either horizontal or vertical
ducts but never in the top or bottom of a horizontal duct. Heaters
installed in vertical ducts are tested and approved for up airflow only!
1.Install a heater a minimum of (4) feet from heat pumps or central air
conditioners.
2. At least 4 feet downstream from an air handler.
3. At least 2 feet either side of an elbow or turn.
4. At least 4 feet from any canvas duct connector or transition section for
change in duct size.
5. At least 4 feet downstream from an air filter.
6. At least 4 feet upstream from a humidifier.
Refer to the back of this sheet for: duct, electrical and air velocity
requirements.
To install a slip-in heater FIG.1, cut an opening, as required in the side
of the duct. Slide heater in the duct using control box as template to
mark the mounting screw holes. Remove unit and drill mounting holes.
Mount unit to duct with sheet metal screws. Connect high and low
voltage supplies along with fan interlock circuit (if no airflow switch is
furnished). Larger heaters may require hangers.
To install a flange type heater FIG.2, Insert heater between two sections
of flanged duct and bolt in place. For additional strength, the duct flange
should be doubled as shown in the figure. Large heaters may require
hanger straps. Connect high and low voltage supplies along with fan
interlock circuit (if no airflow switch is furnished).
500 GOULD DRIVE COOKEVILLE, TN 38506
FAX [phone] PHONE [phone]
INC.
06-4141-00 REV. C E.C.O. 10438
INSTALLATION MANUAL
TUTCO DUCT HEATERS
The information and instructions in this sheet apply to Duct Heater
models for zero clearance installation in ducts.
The Duct Heaters are approved for use with heat pumps, air
conditioners, or other forced air systems. They may be controlled by
contactors, relays, sequencers or solid state devices.
The Duct Heaters are prewired, have voltage ratings to 600 volts, both
single phase and three phase.
The Duct Heaters are furnished with integral controls, except for the DD
& DHD series, which are furnished with a separate control panel for
remote mounting.
GENERAL:
Inspect heater for any possible shipping damage. Check all insulators
for breakage and inspect heater element wire for any deformation that
could cause a short circuit or ground. Make sure all fasteners are tight.
Electrical connections such as pressure terminals should be checked for
tightness.
INSTALLATION:
For safe operation and best performance, the following installation
procedures must be adhered to.
Heaters may be installed in the sides of either horizontal or vertical
ducts but never in the top or bottom of a horizontal duct. Heaters
installed in vertical ducts are tested and approved for up airflow only!
1.Install a heater a minimum of (4) feet from heat pumps or central air
conditioners.
2. At least 4 feet downstream from an air handler.
3. At least 2 feet either side of an elbow or turn.
4. At least 4 feet from any canvas duct connector or transition section for
change in duct size.
5. At least 4 feet downstream from an air filter.
6. At least 4 feet upstream from a humidifier.
Refer to the back of this sheet for: duct, electrical and air velocity
requirements.
To install a slip-in heater FIG.1, cut an opening, as required in the side
of the duct. Slide heater in the duct using control box as template to
mark the mounting screw holes. Remove unit and drill mounting holes.
Mount unit to duct with sheet metal screws. Connect high and low
voltage supplies along with fan interlock circuit (if no airflow switch is
furnished). Larger heaters may require hangers.
To install a flange type heater FIG.2, Insert heater between two sections
of flanged duct and bolt in place. For additional strength, the duct flange
should be doubled as shown in the figure. Large heaters may require
hanger straps. Connect high and low voltage supplies along with fan
interlock circuit (if no airflow switch is furnished).
500 GOULD DRIVE COOKEVILLE, TN 38506
FAX [phone] PHONE [phone]
INC.
06-4141-00 REV. C E.C.O. 10438
INSTALLATION MANUAL
TUTCO DUCT HEATERS
The information and instructions in this sheet apply to Duct Heater
models for zero clearance installation in ducts.
The Duct Heaters are approved for use with heat pumps, air
conditioners, or other forced air systems. They may be controlled by
contactors, relays, sequencers or solid state devices.
The Duct Heaters are prewired, have voltage ratings to 600 volts, both
single phase and three phase.
The Duct Heaters are furnished with integral controls, except for the DD
& DHD series, which are furnished with a separate control panel for
remote mounting.
GENERAL:
Inspect heater for any possible shipping damage. Check all insulators
for breakage and inspect heater element wire for any deformation that
could cause a short circuit or ground. Make sure all fasteners are tight.
Electrical connections such as pressure terminals should be checked for
tightness.
INSTALLATION:
For safe operation and best performance, the following installation
procedures must be adhered to.
Heaters may be installed in the sides of either horizontal or vertical
ducts but never in the top or bottom of a horizontal duct. Heaters
installed in vertical ducts are tested and approved for up airflow only!
1.Install a heater a minimum of (4) feet from heat pumps or central air
conditioners.
2. At least 4 feet downstream from an air handler.
3. At least 2 feet either side of an elbow or turn.
4. At least 4 feet from any canvas duct connector or transition section for
change in duct size.
5. At least 4 feet downstream from an air filter.
6. At least 4 feet upstream from a humidifier.
Refer to the back of this sheet for: duct, electrical and air velocity
requirements.
To install a slip-in heater FIG.1, cut an opening, as required in the side
of the duct. Slide heater in the duct using control box as template to
mark the mounting screw holes. Remove unit and drill mounting holes.
Mount unit to duct with sheet metal screws. Connect high and low
voltage supplies along with fan interlock circuit (if no airflow switch is
furnished). Larger heaters may require hangers.
To install a flange type heater FIG.2, Insert heater between two sections
of flanged duct and bolt in place. For additional strength, the duct flange
should be doubled as shown in the figure. Large heaters may require
hanger straps. Connect high and low voltage supplies along with fan
interlock circuit (if no airflow switch is furnished).
500 GOULD DRIVE COOKEVILLE, TN 38506
FAX [phone] PHONE [phone]
INC.
TERMINAL OR
CONTROL BOX
HEATING
ELEMENTS
FRAME
FRAME
TERMINAL OR
CONTROL BOX
HEATING
ELEMENTS

ELECTRIC DUCT HEATER
111.800.627.4499 INSTALLATION, OPERATION AND MAINTENANCE MANUAL RENEWAIRE.COM
HEATING ELEMENT WIRING
INSTALLATION
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
DELTA
WYE
SINGLE
PHASE
SUPPLY
HEATING
ELEMENT
CONTACTOR
SINGLE
PHASE
SUPPLY
CONTACTOR
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
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
1.73
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.
HEATING
ELEMENT(S)
LINE
VOLTAGE
THREE PHASESINGLE PHASE
Element Voltage = Line Voltage
480V for illustration only
lL1
lL3
lL2
L1
480V
480V
480V
L2
L3
lL1
lL3
lL2
480V
480V
480V
L1
L2
L3
SINGLE
PHASE
SUPPLY

ELECTRIC DUCT HEATER
RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.4499
12
WIRING SCHEMATICS
INSTALLATION
EK AND EH HEATER - SINGLE PHASE SCR CONTROL WIRING
EK HEATER - SINGLE PHASE ON-OFF CONTROL WIRING

ELECTRIC DUCT HEATER
131.800.627.4499 INSTALLATION, OPERATION AND MAINTENANCE MANUAL RENEWAIRE.COM
WIRING SCHEMATICS
INSTALLATION
EK AND EH HEATER - THREE PHASE SCR CONTROL WIRING
EK HEATER - THREE PHASE ON-OFF CONTROL WIRING

ELECTRIC DUCT HEATER
RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.4499
14
INSTALLATION
INSTALLATION INSTRUCTIONS LOW VOLTAGE CONTROL SYSTEM
This heater is provided with a Class II 24 VAC power
supply system that operates the unit’s contactor(s).
The 24 VAC Power Supply can also be used to
power the externally-installed controls system.
In the event of a short-circuit or overload, the trans-
former itself is designed to fail safely.
SPECIFICATIONS
•Nominal Output Voltage under load: 24 VAC
•Typical Output Voltage at no load: 29-31V
•Minimum contact rating for connected control
device: (50mA (1.2VA)
1. Connect only to components intended for use with 24 VAC power.
2. Do not undersize the low-voltage wires connected to this device. Observe the wire length and gauge
limits indicated in this manual.
3. Do not overload this unit’s 24 VAC power supply system. Confirm that the power requirements of devices
you connect to this power supply system do not exceed transformer available power.
CAUTION
LIMITS OF POWER OUTPUT
If limits on wire gauge and length are observed, you may connect control devices that draw up to 8VA to
the provided terminals. More than one device can be connected as long as total steady-state load does
not exceed transformer available power.
OBSERVE THESE LIMITS TO WIRE LENGTH AND GAUGE
in order to ensure reliable operation of the control system.
Wire Gauge #22 #20 #18 #16 #14 #12
Circuit Length 100' 150' 250' 400' 700' 1000'
“Circuit Length” is distance from Heater to Control Device.
1. Before servicing or cleaning the heater, switch
power off at disconnect switch or service panel
and lock-out/tag-out to prevent power from
being switched on accidentally. More than
one disconnect switch may be required to de-
energize the equipment for servicing.
2. This installation manual shows the suggested
installation method. Additional measures may
be required by local codes and standards.
3. Installation work and electrical wiring must be
done by qualified professional(s) in accordance
with all applicable codes, standards and
licensing requirements.
4. Any structural alterations necessary for
installation must comply with all applicable
building, health, and safety code requirements.
5. This heater must be grounded.
6. Use the heater only in the manner intended
by the manufacturer. If you have questions,
contact the manufacturer.
RISK OF FIRE, ELECTRIC SHOCK, OR INJURY. OBSERVE ALL CODES AND THE FOLLOWING:
WARNING

ELECTRIC DUCT HEATER
151.800.627.4499 INSTALLATION, OPERATION AND MAINTENANCE MANUAL RENEWAIRE.COM
INSTALLATION INSTRUCTIONS
INSTALLATION
1. Never operate a duct
heater without airflow.
The heater must always be
interlocked with the fan. This
may be accomplished by
either an airflow switch or
fan interlock relay.
2. Never operate heater
without achieving at least
the minimum airflow
required. Always refer to
the installation instructions
and the nameplate label to
determine your minimum
air velocities based on
your inlet air temperature.
If the minimum airflow
requirements are not present
the heater will not function
properly and safely. (see F4)
3. Never operate the heater
with uneven airflow. The
minimum airflow requirements
must be present at all points
over the heater face. (see F4)
4. The air must be filtered.
The incoming air must be free
from all debris, combustible
particles, and hazardous
vapors.
5. Always locate the heater
at least 24" from an elbow
or turn. (See F5)
6. Always locate the heater
at least 48" from an ERV,
heat pump or central air
conditioner. (See F6)
F5
F6
F4
500 fpm
470 fpm
780 fpm
ELECTRIC DUCT HEATER
TROUBLESHOOTING GUIDE
24" MIN.
48" MIN.
HEAT PUMP OR
AIR CONDITIONER
HEATER
HEATER
DUCT
DUCT
HEATER
48" MIN. 48" MIN.
HEATER
EXAMPLE: IF 780 fpm IS REQUIRED
EXAMPLE: IF 780 fpm IS REQUIRED
EXAMPLE: IF 780 fpm IS REQUIRED
CORRECT
MIN. AIRFLOW AND EVEN AIR
DISTRIBUTION ARE PRESENT
INCORRECT
MIN. AIRFLOW AND EVEN AIR
DISTRIBUTION ARE NOT PRESENT
INCORRECT
MIN. AIRFLOW IS NOT PRESENT
INCORRECT
CORRECT
FIG. 1
FIG. 2
FIG. 3
FIG. 4
A DUCT HEATER MUST BE INSTALLED ACCORDING
TO THE INSTALLATION INSTRUCTIONS, WIRING
DIAGRAM AND LABELING SUPPLIED WITH THE
HEATER.
Listed below are some important items when installing
a electric duct heater:
1. NEVER OPERATE A DUCT HEATER WITHOUT
AIRFLOW.
The heater must always be interlocked with the
fan. This may be accomplished by either an airflow
switch or fan interlock relay.
2. NEVER OPERATE HEATER WITHOUT ACHIEVING
AT LEAST THE MINIMUM AIRFLOW REQUIRED.
Always refer to the installation instructions and
the nameplate label to determine your minimum
air velocities based on your inlet air temperature.
If the minimum airflow requirements are not
present the heater will not function properly and
safely. (see fig. 1)
3. NEVER OPERATE THE HEATER WITH UNEVEN
AIRFLOW.
The minimum airflow requirements must be
present at all points over the heater face.
(see fig. 1)
4. THE AIR MUST BE FILTERED.
The incoming air must be free from all debris,
combustible particles, and hazardous vapors.
5. ALWAYS LOCATE THE HEATER AT LEAST 24"
FROM AN ELBOW OR TURN.
(see fig. 2)
6. ALWAYS LOCATE THE HEATER AT LEAST 48"
FROM AN HEAT PUMP OR CENTRAL AIR
CONDITIONER.
(see fig. 3)
7. ALWAYS LOCATE THE HEATER AT LEAST 48"
FROM ANY CANVAS DUCT CONNECTOR OR
TRANSITION SECTION FOR CHANGE IN DUCT
SIZE.
(see fig. 4)
8. ALWAYS LOCATE THE HEATER AT LEAST 48"
DOWNSTREAM FROM AN AIR HANDLER.
(see fig. 5)
9. ALWAYS LOCATE THE HEATER AT LEAST 48"
UPSTREAM FROM AN HUMIDIFIER.
(see fig. 6)
470 fpm
470 fpm
780 fpm
780 fpm
DUCT
DUCT
PAGE 1 OF 2
NOTE: ALL FIGURES ARE SHOWING A TOP
VIEW OF A HORZONTIAL DUCT.
780 fpm
780 fpm
500 GOULD DRIVE COOKEVILLE, TN 38506
FAX [phone] PHONE [phone]
INC.
APPLICATION GUIDE
A duct heater must be installed according to the installation instructions, wiring diagram and labeling
supplied with the heater.
Listed below are some important items when installing an electric duct heater:
Note: An airflow switch only proves that airflow exists (a differential
in static pressure), not that the minimum air velocities and proper air
distribution for the duct heater exist.
Note: All figures are showing a top view of a horizontal duct.
500 fpm
470 fpm
780 fpm
ELECTRIC DUCT HEATER
TROUBLESHOOTING GUIDE
24" MIN.
48" MIN.
HEAT PUMP OR
AIR CONDITIONER
HEATER
HEATER
DUCT
DUCT
HEATER
48" MIN. 48" MIN.
HEATER
EXAMPLE: IF 780 fpm IS REQUIRED
EXAMPLE: IF 780 fpm IS REQUIRED
EXAMPLE: IF 780 fpm IS REQUIRED
CORRECT
MIN. AIRFLOW AND EVEN AIR
DISTRIBUTION ARE PRESENT
INCORRECT
MIN. AIRFLOW AND EVEN AIR
DISTRIBUTION ARE NOT PRESENT
INCORRECT
MIN. AIRFLOW IS NOT PRESENT
INCORRECT
CORRECT
FIG. 1
FIG. 2
FIG. 3
FIG. 4
A DUCT HEATER MUST BE INSTALLED ACCORDING
TO THE INSTALLATION INSTRUCTIONS, WIRING
DIAGRAM AND LABELING SUPPLIED WITH THE
HEATER.
Listed below are some important items when installing
a electric duct heater:
1. NEVER OPERATE A DUCT HEATER WITHOUT
AIRFLOW.
The heater must always be interlocked with the
fan. This may be accomplished by either an airflow
switch or fan interlock relay.
2. NEVER OPERATE HEATER WITHOUT ACHIEVING
AT LEAST THE MINIMUM AIRFLOW REQUIRED.
Always refer to the installation instructions and
the nameplate label to determine your minimum
air velocities based on your inlet air temperature.
If the minimum airflow requirements are not
present the heater will not function properly and
safely. (see fig. 1)
3. NEVER OPERATE THE HEATER WITH UNEVEN
AIRFLOW.
The minimum airflow requirements must be
present at all points over the heater face.
(see fig. 1)
4. THE AIR MUST BE FILTERED.
The incoming air must be free from all debris,
combustible particles, and hazardous vapors.
5. ALWAYS LOCATE THE HEATER AT LEAST 24"
FROM AN ELBOW OR TURN.
(see fig. 2)
6. ALWAYS LOCATE THE HEATER AT LEAST 48"
FROM AN HEAT PUMP OR CENTRAL AIR
CONDITIONER.
(see fig. 3)
7. ALWAYS LOCATE THE HEATER AT LEAST 48"
FROM ANY CANVAS DUCT CONNECTOR OR
TRANSITION SECTION FOR CHANGE IN DUCT
SIZE.
(see fig. 4)
8. ALWAYS LOCATE THE HEATER AT LEAST 48"
DOWNSTREAM FROM AN AIR HANDLER.
(see fig. 5)
9. ALWAYS LOCATE THE HEATER AT LEAST 48"
UPSTREAM FROM AN HUMIDIFIER.
(see fig. 6)
470 fpm
470 fpm
780 fpm
780 fpm
DUCT
DUCT
PAGE 1 OF 2
NOTE: ALL FIGURES ARE SHOWING A TOP
VIEW OF A HORZONTIAL DUCT.
780 fpm
780 fpm
500 GOULD DRIVE COOKEVILLE, TN 38506
FAX [phone] PHONE [phone]
INC.
500 fpm
470 fpm
780 fpm
ELECTRIC DUCT HEATER
TROUBLESHOOTING GUIDE
24" MIN.
48" MIN.
HEAT PUMP OR
AIR CONDITIONER
HEATER
HEATER
DUCT
DUCT
HEATER
48" MIN. 48" MIN.
HEATER
EXAMPLE: IF 780 fpm IS REQUIRED
EXAMPLE: IF 780 fpm IS REQUIRED
EXAMPLE: IF 780 fpm IS REQUIRED
CORRECT
MIN. AIRFLOW AND EVEN AIR
DISTRIBUTION ARE PRESENT
INCORRECT
MIN. AIRFLOW AND EVEN AIR
DISTRIBUTION ARE NOT PRESENT
INCORRECT
MIN. AIRFLOW IS NOT PRESENT
INCORRECT
CORRECT
FIG. 1
FIG. 2
FIG. 3
FIG. 4
A DUCT HEATER MUST BE INSTALLED ACCORDING
TO THE INSTALLATION INSTRUCTIONS, WIRING
DIAGRAM AND LABELING SUPPLIED WITH THE
HEATER.
Listed below are some important items when installing
a electric duct heater:
1. NEVER OPERATE A DUCT HEATER WITHOUT
AIRFLOW.
The heater must always be interlocked with the
fan. This may be accomplished by either an airflow
switch or fan interlock relay.
2. NEVER OPERATE HEATER WITHOUT ACHIEVING
AT LEAST THE MINIMUM AIRFLOW REQUIRED.
Always refer to the installation instructions and
the nameplate label to determine your minimum
air velocities based on your inlet air temperature.
If the minimum airflow requirements are not
present the heater will not function properly and
safely. (see fig. 1)
3. NEVER OPERATE THE HEATER WITH UNEVEN
AIRFLOW.
The minimum airflow requirements must be
present at all points over the heater face.
(see fig. 1)
4. THE AIR MUST BE FILTERED.
The incoming air must be free from all debris,
combustible particles, and hazardous vapors.
5. ALWAYS LOCATE THE HEATER AT LEAST 24"
FROM AN ELBOW OR TURN.
(see fig. 2)
6. ALWAYS LOCATE THE HEATER AT LEAST 48"
FROM AN HEAT PUMP OR CENTRAL AIR
CONDITIONER.
(see fig. 3)
7. ALWAYS LOCATE THE HEATER AT LEAST 48"
FROM ANY CANVAS DUCT CONNECTOR OR
TRANSITION SECTION FOR CHANGE IN DUCT
SIZE.
(see fig. 4)
8. ALWAYS LOCATE THE HEATER AT LEAST 48"
DOWNSTREAM FROM AN AIR HANDLER.
(see fig. 5)
9. ALWAYS LOCATE THE HEATER AT LEAST 48"
UPSTREAM FROM AN HUMIDIFIER.
(see fig. 6)
470 fpm
470 fpm
780 fpm
780 fpm
DUCT
DUCT
PAGE 1 OF 2
NOTE: ALL FIGURES ARE SHOWING A TOP
VIEW OF A HORZONTIAL DUCT.
780 fpm
780 fpm
500 GOULD DRIVE COOKEVILLE, TN 38506
FAX [phone] PHONE [phone]
INC.

ELECTRIC DUCT HEATER
RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.4499
16
INSTALLATION INSTRUCTIONS
INSTALLATION
F7
500 fpm
470 fpm
780 fpm
ELECTRIC DUCT HEATER
TROUBLESHOOTING GUIDE
24" MIN.
48" MIN.
HEAT PUMP OR
AIR CONDITIONER
HEATER
HEATER
DUCT
DUCT
HEATER
48" MIN. 48" MIN.
HEATER
EXAMPLE: IF 780 fpm IS REQUIRED
EXAMPLE: IF 780 fpm IS REQUIRED
EXAMPLE: IF 780 fpm IS REQUIRED
CORRECT
MIN. AIRFLOW AND EVEN AIR
DISTRIBUTION ARE PRESENT
INCORRECT
MIN. AIRFLOW AND EVEN AIR
DISTRIBUTION ARE NOT PRESENT
INCORRECT
MIN. AIRFLOW IS NOT PRESENT
INCORRECT
CORRECT
FIG. 1
FIG. 2
FIG. 3
FIG. 4
A DUCT HEATER MUST BE INSTALLED ACCORDING
TO THE INSTALLATION INSTRUCTIONS, WIRING
DIAGRAM AND LABELING SUPPLIED WITH THE
HEATER.
Listed below are some important items when installing
a electric duct heater:
1. NEVER OPERATE A DUCT HEATER WITHOUT
AIRFLOW.
The heater must always be interlocked with the
fan. This may be accomplished by either an airflow
switch or fan interlock relay.
2. NEVER OPERATE HEATER WITHOUT ACHIEVING
AT LEAST THE MINIMUM AIRFLOW REQUIRED.
Always refer to the installation instructions and
the nameplate label to determine your minimum
air velocities based on your inlet air temperature.
If the minimum airflow requirements are not
present the heater will not function properly and
safely. (see fig. 1)
3. NEVER OPERATE THE HEATER WITH UNEVEN
AIRFLOW.
The minimum airflow requirements must be
present at all points over the heater face.
(see fig. 1)
4. THE AIR MUST BE FILTERED.
The incoming air must be free from all debris,
combustible particles, and hazardous vapors.
5. ALWAYS LOCATE THE HEATER AT LEAST 24"
FROM AN ELBOW OR TURN.
(see fig. 2)
6. ALWAYS LOCATE THE HEATER AT LEAST 48"
FROM AN HEAT PUMP OR CENTRAL AIR
CONDITIONER.
(see fig. 3)
7. ALWAYS LOCATE THE HEATER AT LEAST 48"
FROM ANY CANVAS DUCT CONNECTOR OR
TRANSITION SECTION FOR CHANGE IN DUCT
SIZE.
(see fig. 4)
8. ALWAYS LOCATE THE HEATER AT LEAST 48"
DOWNSTREAM FROM AN AIR HANDLER.
(see fig. 5)
9. ALWAYS LOCATE THE HEATER AT LEAST 48"
UPSTREAM FROM AN HUMIDIFIER.
(see fig. 6)
470 fpm
470 fpm
780 fpm
780 fpm
DUCT
DUCT
PAGE 1 OF 2
NOTE: ALL FIGURES ARE SHOWING A TOP
VIEW OF A HORZONTIAL DUCT.
780 fpm
780 fpm
500 GOULD DRIVE COOKEVILLE, TN 38506
FAX [phone] PHONE [phone]
INC.
DUCT W/ INTERNAL INSULATION
DUCT W/ EXTERNAL INSULATION
10. ALWAYS LOCATE THE HEATER AT LEAST 48"
DOWNSTREAM FROM AN AIR FILTER.
(see fig. 7)
11. NEVER INSTALL A STANDARD HEATER INTO A
DUCT WITH AN INTERNAL OBSTRUCTION.
Due to the fact that an obstruction can block
airflow at the temperature limit controls and
element terminations. If this situation exist, it
can be corrected by using a heater with a
recessed control box and reduced wrapper size.
This situation is common with internally insulated
ducts. (see fig. 8)
12. NEVER INSULATE THE EXTERIOR OF THE
CONTROL BOX.
The control box must be completely accessible
and located where ventilation can be provided at
all times. (see fig. 9)
13. NEVER INSTALL A HEATER NEAR A DOUBLE
BLOWER OUTLET.
A heater must be installed far enough away from
a double blower outlet that even and proper
airflow is present or separate duct heaters
placed in the duct runouts of each blower. (all
installation must conform with the heater
installation instructions.) (see fig. 10)
14. NEVER INSTALL A HEATER LESS THAN 48"
FROM ANY FAN.
Mounting a heater any closer than 48" to a fan
will result in uneven airflow.
15. ORDER THE HEATER WITH THE FACTORY
INSTALLED LINEAR TEMPERATURE LIMIT
CONTROL IF THE HEATER WIDTH > 72".
16. NEVER USE ALUMINUM CONDUCTORS.
Use copper conductors only for all incoming
wiring.
17. NEVER INSTALL A STANDARD HEATER
OUTDOORS WITHOUT MAKING SPECIAL
PROVISIONS TO PROTECT THE HEATER
AND CONTROL BOX FROM THE ELEMENTS.
18. NEVER BUNDLE, TIE OR WRAP POWER WIRING.
The wire could overheat or the insulation could
breakdown.
19. NEVER USE A DIFFERENT VOLTAGE AND/OR
PHASE THAN WHAT IS LISTED ON THE HEATER
NAMEPLATE LABEL.
The duct heater is to be used only at the voltage
and phase that is listed on the nameplate label.
Note: An airflow switch only proves that airflow exist
(a differential in static pressure), not that the
minimum air velocities and proper air
distribution for the duct heater exist.
AIR HANDLER
HEATER
FIG. 5
FIG. 6
HEATER
HUMIDIFIER
AIR FILTER
HEATER
FIG. 7
48" MIN.
48" MIN.
CORRECT INCORRECT
CORRECT INCORRECT
FIG. 8
FIG. 9
FIG. 10
PAGE 2 OF 2
DUCT
DUCT
DUCT
VIEW OF A HORZONTIAL DUCT.
NOTE: ALL FIGURES ARE SHOWING A TOP
INCORRECT
48" MIN.
F8
DUCT W/ INTERNAL INSULATION
DUCT W/ EXTERNAL INSULATION
10. ALWAYS LOCATE THE HEATER AT LEAST 48"
DOWNSTREAM FROM AN AIR FILTER.
(see fig. 7)
11. NEVER INSTALL A STANDARD HEATER INTO A
DUCT WITH AN INTERNAL OBSTRUCTION.
Due to the fact that an obstruction can block
airflow at the temperature limit controls and
element terminations. If this situation exist, it
can be corrected by using a heater with a
recessed control box and reduced wrapper size.
This situation is common with internally insulated
ducts. (see fig. 8)
12. NEVER INSULATE THE EXTERIOR OF THE
CONTROL BOX.
The control box must be completely accessible
and located where ventilation can be provided at
all times. (see fig. 9)
13. NEVER INSTALL A HEATER NEAR A DOUBLE
BLOWER OUTLET.
A heater must be installed far enough away from
a double blower outlet that even and proper
airflow is present or separate duct heaters
placed in the duct runouts of each blower. (all
installation must conform with the heater
installation instructions.) (see fig. 10)
14. NEVER INSTALL A HEATER LESS THAN 48"
FROM ANY FAN.
Mounting a heater any closer than 48" to a fan
will result in uneven airflow.
15. ORDER THE HEATER WITH THE FACTORY
INSTALLED LINEAR TEMPERATURE LIMIT
CONTROL IF THE HEATER WIDTH > 72".
16. NEVER USE ALUMINUM CONDUCTORS.
Use copper conductors only for all incoming
wiring.
17. NEVER INSTALL A STANDARD HEATER
OUTDOORS WITHOUT MAKING SPECIAL
PROVISIONS TO PROTECT THE HEATER
AND CONTROL BOX FROM THE ELEMENTS.
18. NEVER BUNDLE, TIE OR WRAP POWER WIRING.
The wire could overheat or the insulation could
breakdown.
19. NEVER USE A DIFFERENT VOLTAGE AND/OR
PHASE THAN WHAT IS LISTED ON THE HEATER
NAMEPLATE LABEL.
The duct heater is to be used only at the voltage
and phase that is listed on the nameplate label.
Note: An airflow switch only proves that airflow exist
(a differential in static pressure), not that the
minimum air velocities and proper air
distribution for the duct heater exist.
AIR HANDLER
HEATER
FIG. 5
FIG. 6
HEATER
HUMIDIFIER
AIR FILTER
HEATER
FIG. 7
48" MIN.
48" MIN.
CORRECT INCORRECT
CORRECT INCORRECT
FIG. 8
FIG. 9
FIG. 10
PAGE 2 OF 2
DUCT
DUCT
DUCT
VIEW OF A HORZONTIAL DUCT.
NOTE: ALL FIGURES ARE SHOWING A TOP
INCORRECT
48" MIN.
F9
DUCT W/ INTERNAL INSULATION
DUCT W/ EXTERNAL INSULATION
10. ALWAYS LOCATE THE HEATER AT LEAST 48"
DOWNSTREAM FROM AN AIR FILTER.
(see fig. 7)
11. NEVER INSTALL A STANDARD HEATER INTO A
DUCT WITH AN INTERNAL OBSTRUCTION.
Due to the fact that an obstruction can block
airflow at the temperature limit controls and
element terminations. If this situation exist, it
can be corrected by using a heater with a
recessed control box and reduced wrapper size.
This situation is common with internally insulated
ducts. (see fig. 8)
12. NEVER INSULATE THE EXTERIOR OF THE
CONTROL BOX.
The control box must be completely accessible
and located where ventilation can be provided at
all times. (see fig. 9)
13. NEVER INSTALL A HEATER NEAR A DOUBLE
BLOWER OUTLET.
A heater must be installed far enough away from
a double blower outlet that even and proper
airflow is present or separate duct heaters
placed in the duct runouts of each blower. (all
installation must conform with the heater
installation instructions.) (see fig. 10)
14. NEVER INSTALL A HEATER LESS THAN 48"
FROM ANY FAN.
Mounting a heater any closer than 48" to a fan
will result in uneven airflow.
15. ORDER THE HEATER WITH THE FACTORY
INSTALLED LINEAR TEMPERATURE LIMIT
CONTROL IF THE HEATER WIDTH > 72".
16. NEVER USE ALUMINUM CONDUCTORS.
Use copper conductors only for all incoming
wiring.
17. NEVER INSTALL A STANDARD HEATER
OUTDOORS WITHOUT MAKING SPECIAL
PROVISIONS TO PROTECT THE HEATER
AND CONTROL BOX FROM THE ELEMENTS.
18. NEVER BUNDLE, TIE OR WRAP POWER WIRING.
The wire could overheat or the insulation could
breakdown.
19. NEVER USE A DIFFERENT VOLTAGE AND/OR
PHASE THAN WHAT IS LISTED ON THE HEATER
NAMEPLATE LABEL.
The duct heater is to be used only at the voltage
and phase that is listed on the nameplate label.
Note: An airflow switch only proves that airflow exist
(a differential in static pressure), not that the
minimum air velocities and proper air
distribution for the duct heater exist.
AIR HANDLER
HEATER
FIG. 5
FIG. 6
HEATER
HUMIDIFIER
AIR FILTER
HEATER
FIG. 7
48" MIN.
48" MIN.
CORRECT INCORRECT
CORRECT INCORRECT
FIG. 8
FIG. 9
FIG. 10
PAGE 2 OF 2
DUCT
DUCT
DUCT
VIEW OF A HORZONTIAL DUCT.
NOTE: ALL FIGURES ARE SHOWING A TOP
INCORRECT
48" MIN.
F10
7. Always locate the heater
at least 48" from any
canvas duct connector
or transition section for
change in duct size. If
connecting to round duct,
install heater in a rectangular
duct section. Use round-
to-rectangular pyramidal
transitions to connect round
duct to rectangular duct.
Always locate the heater at
least 48" from any transition
section for change in duct
size. Follow installation
guidelines given in manual
and in accordance with
SMACNA guidelines (see F7)
8. Always locate the heater at
least 48" downstream from
an air handler. (See F8)
9. Always locate the heater
at least 48" upstream from
an humidifier. (See F9)
10. Always locate the heater
at least 48" downstream
from an air filter. (See F10)

ELECTRIC DUCT HEATER
171.800.627.4499 INSTALLATION, OPERATION AND MAINTENANCE MANUAL RENEWAIRE.COM
INSTALLATION
INSTALLATION INSTRUCTIONS
F13
F11
DUCT W/ INTERNAL INSULATION
DUCT W/ EXTERNAL INSULATION
10. ALWAYS LOCATE THE HEATER AT LEAST 48"
DOWNSTREAM FROM AN AIR FILTER.
(see fig. 7)
11. NEVER INSTALL A STANDARD HEATER INTO A
DUCT WITH AN INTERNAL OBSTRUCTION.
Due to the fact that an obstruction can block
airflow at the temperature limit controls and
element terminations. If this situation exist, it
can be corrected by using a heater with a
recessed control box and reduced wrapper size.
This situation is common with internally insulated
ducts. (see fig. 8)
12. NEVER INSULATE THE EXTERIOR OF THE
CONTROL BOX.
The control box must be completely accessible
and located where ventilation can be provided at
all times. (see fig. 9)
13. NEVER INSTALL A HEATER NEAR A DOUBLE
BLOWER OUTLET.
A heater must be installed far enough away from
a double blower outlet that even and proper
airflow is present or separate duct heaters
placed in the duct runouts of each blower. (all
installation must conform with the heater
installation instructions.) (see fig. 10)
14. NEVER INSTALL A HEATER LESS THAN 48"
FROM ANY FAN.
Mounting a heater any closer than 48" to a fan
will result in uneven airflow.
15. ORDER THE HEATER WITH THE FACTORY
INSTALLED LINEAR TEMPERATURE LIMIT
CONTROL IF THE HEATER WIDTH > 72".
16. NEVER USE ALUMINUM CONDUCTORS.
Use copper conductors only for all incoming
wiring.
17. NEVER INSTALL A STANDARD HEATER
OUTDOORS WITHOUT MAKING SPECIAL
PROVISIONS TO PROTECT THE HEATER
AND CONTROL BOX FROM THE ELEMENTS.
18. NEVER BUNDLE, TIE OR WRAP POWER WIRING.
The wire could overheat or the insulation could
breakdown.
19. NEVER USE A DIFFERENT VOLTAGE AND/OR
PHASE THAN WHAT IS LISTED ON THE HEATER
NAMEPLATE LABEL.
The duct heater is to be used only at the voltage
and phase that is listed on the nameplate label.
Note: An airflow switch only proves that airflow exist
(a differential in static pressure), not that the
minimum air velocities and proper air
distribution for the duct heater exist.
AIR HANDLER
HEATER
FIG. 5
FIG. 6
HEATER
HUMIDIFIER
AIR FILTER
HEATER
FIG. 7
48" MIN.
48" MIN.
CORRECT INCORRECT
CORRECT INCORRECT
FIG. 8
FIG. 9
FIG. 10
PAGE 2 OF 2
DUCT
DUCT
DUCT
VIEW OF A HORZONTIAL DUCT.
NOTE: ALL FIGURES ARE SHOWING A TOP
INCORRECT
48" MIN.
F12
DUCT W/ INTERNAL INSULATION
DUCT W/ EXTERNAL INSULATION
10. ALWAYS LOCATE THE HEATER AT LEAST 48"
DOWNSTREAM FROM AN AIR FILTER.
(see fig. 7)
11. NEVER INSTALL A STANDARD HEATER INTO A
DUCT WITH AN INTERNAL OBSTRUCTION.
Due to the fact that an obstruction can block
airflow at the temperature limit controls and
element terminations. If this situation exist, it
can be corrected by using a heater with a
recessed control box and reduced wrapper size.
This situation is common with internally insulated
ducts. (see fig. 8)
12. NEVER INSULATE THE EXTERIOR OF THE
CONTROL BOX.
The control box must be completely accessible
and located where ventilation can be provided at
all times. (see fig. 9)
13. NEVER INSTALL A HEATER NEAR A DOUBLE
BLOWER OUTLET.
A heater must be installed far enough away from
a double blower outlet that even and proper
airflow is present or separate duct heaters
placed in the duct runouts of each blower. (all
installation must conform with the heater
installation instructions.) (see fig. 10)
14. NEVER INSTALL A HEATER LESS THAN 48"
FROM ANY FAN.
Mounting a heater any closer than 48" to a fan
will result in uneven airflow.
15. ORDER THE HEATER WITH THE FACTORY
INSTALLED LINEAR TEMPERATURE LIMIT
CONTROL IF THE HEATER WIDTH > 72".
16. NEVER USE ALUMINUM CONDUCTORS.
Use copper conductors only for all incoming
wiring.
17. NEVER INSTALL A STANDARD HEATER
OUTDOORS WITHOUT MAKING SPECIAL
PROVISIONS TO PROTECT THE HEATER
AND CONTROL BOX FROM THE ELEMENTS.
18. NEVER BUNDLE, TIE OR WRAP POWER WIRING.
The wire could overheat or the insulation could
breakdown.
19. NEVER USE A DIFFERENT VOLTAGE AND/OR
PHASE THAN WHAT IS LISTED ON THE HEATER
NAMEPLATE LABEL.
The duct heater is to be used only at the voltage
and phase that is listed on the nameplate label.
Note: An airflow switch only proves that airflow exist
(a differential in static pressure), not that the
minimum air velocities and proper air
distribution for the duct heater exist.
AIR HANDLER
HEATER
FIG. 5
FIG. 6
HEATER
HUMIDIFIER
AIR FILTER
HEATER
FIG. 7
48" MIN.
48" MIN.
CORRECT INCORRECT
CORRECT INCORRECT
FIG. 8
FIG. 9
FIG. 10
PAGE 2 OF 2
DUCT
DUCT
DUCT
VIEW OF A HORZONTIAL DUCT.
NOTE: ALL FIGURES ARE SHOWING A TOP
INCORRECT
48" MIN.
DUCT W/ INTERNAL INSULATION
DUCT W/ EXTERNAL INSULATION
10. ALWAYS LOCATE THE HEATER AT LEAST 48"
DOWNSTREAM FROM AN AIR FILTER.
(see fig. 7)
11. NEVER INSTALL A STANDARD HEATER INTO A
DUCT WITH AN INTERNAL OBSTRUCTION.
Due to the fact that an obstruction can block
airflow at the temperature limit controls and
element terminations. If this situation exist, it
can be corrected by using a heater with a
recessed control box and reduced wrapper size.
This situation is common with internally insulated
ducts. (see fig. 8)
12. NEVER INSULATE THE EXTERIOR OF THE
CONTROL BOX.
The control box must be completely accessible
and located where ventilation can be provided at
all times. (see fig. 9)
13. NEVER INSTALL A HEATER NEAR A DOUBLE
BLOWER OUTLET.
A heater must be installed far enough away from
a double blower outlet that even and proper
airflow is present or separate duct heaters
placed in the duct runouts of each blower. (all
installation must conform with the heater
installation instructions.) (see fig. 10)
14. NEVER INSTALL A HEATER LESS THAN 48"
FROM ANY FAN.
Mounting a heater any closer than 48" to a fan
will result in uneven airflow.
15. ORDER THE HEATER WITH THE FACTORY
INSTALLED LINEAR TEMPERATURE LIMIT
CONTROL IF THE HEATER WIDTH > 72".
16. NEVER USE ALUMINUM CONDUCTORS.
Use copper conductors only for all incoming
wiring.
17. NEVER INSTALL A STANDARD HEATER
OUTDOORS WITHOUT MAKING SPECIAL
PROVISIONS TO PROTECT THE HEATER
AND CONTROL BOX FROM THE ELEMENTS.
18. NEVER BUNDLE, TIE OR WRAP POWER WIRING.
The wire could overheat or the insulation could
breakdown.
19. NEVER USE A DIFFERENT VOLTAGE AND/OR
PHASE THAN WHAT IS LISTED ON THE HEATER
NAMEPLATE LABEL.
The duct heater is to be used only at the voltage
and phase that is listed on the nameplate label.
Note: An airflow switch only proves that airflow exist
(a differential in static pressure), not that the
minimum air velocities and proper air
distribution for the duct heater exist.
AIR HANDLER
HEATER
FIG. 5
FIG. 6
HEATER
HUMIDIFIER
AIR FILTER
HEATER
FIG. 7
48" MIN.
48" MIN.
CORRECT INCORRECT
CORRECT INCORRECT
FIG. 8
FIG. 9
FIG. 10
PAGE 2 OF 2
DUCT
DUCT
DUCT
VIEW OF A HORZONTIAL DUCT.
NOTE: ALL FIGURES ARE SHOWING A TOP
INCORRECT
48" MIN.
11. Never install a standard
heater into a duct with an
internal obstruction. Due to
the fact that an obstruction
can block airflow at the
temperature limit controls
and element terminations. If
this situation exists, it can be
corrected by using a heater
with a recessed control box
and reduced wrapper size.
This situation is common
with internally insulated
ducts. (see F11)
12. Never insulate the exterior
of the control box. The
control box must be
completely accessible and
located where ventilation
can be provided at all times.
(see F12)
13. Never install a heater near
a double blower outlet. A
heater must be installed far
enough away from a double
blower outlet that even and
proper airflow is present or
separate duct heaters placed
in the duct runouts of each
blower. (all installation must
conform with the heater
installation instructions.) (see
F13)
14. Never install a heater less
than 48" from any fan.
Mounting a heater any closer
than 48" to a fan will result
in uneven airflow.
15. Never use aluminum
conductors. Use copper
conductors only for all
incoming wiring.
16. Never install a standard
heater outdoors without
making special provisions
to protect the heater
and control box from the
elements.
17. Never bundle, tie or
wrap power wiring. The
wire could overheat or the
insulation could breakdown.
18. Never use a different
voltage and/or phase than
what is listed on the heater
nameplate label. The duct
heater is to be used only at
the voltage and phase that is
listed on the nameplate label.

ELECTRIC DUCT HEATER
RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.4499
18
ACCESSORIES
These heaters may be ordered with factory-supplied thermostats.
NOTE: Installation details for Electric Duct Heaters equipped with SCR's or Electronic Step Controllers
(Including SCR Vernier Control)
This heater is designed to accept an analog control signal. The heater will need to be supplied with either
a 0(2) to 10 VDC or a 4 to 20 mA signal
INTERFACE MODULE CONTROL SIGNAL WIRING CONNECTION DIAGRAM
A
1 2 34
COMMON
24 VAC
0 TO 10
VDC OUTPUT
INTERFACE MODULE
2 TO 10 VDC
STAND ALONE THERMOSTAT
A. Stand Alone Thermostat
for Modulating Control: Use
this schematic if thermostat
requires 24 VAC power and is
to be powered by the heater
transformer.
B
INTERFACE MODULE
4
3
21
-
+
D.D.C. BUILDING AUTOMATION SYSTEM
2 TO 10 VDC FROM
B. DDC BAS for Modulating
Control (2-10Vdc): Use this
schematic if the Building
Automation System provides
a 2-10 Vdc signal to control
the heater.
C
BUILDING AUTOMATION SYSTEM
4 TO 20 mA FROM D.D.C.
+
-
1234
INTERFACE MODULE
C. DDC BAS for Modulating
Control (4-20 mA): Use this
schematic if the Building
Automation System provides
a 4-20 mA signal to control
the heater.
INSTALLATION
CONTROL WIRING
SCHEMATICS
This heater will NOT operate with
a standard 24 VAC control signal.
CAUTION
Do NOT adjust any dip switches
on the controls within the heater!
They are factory set-control.
Signal is determined by interface
module connection.
CAUTION

ELECTRIC DUCT HEATER
191.800.627.4499 INSTALLATION, OPERATION AND MAINTENANCE MANUAL RENEWAIRE.COM
INSTALLATION
CONTROL WIRING
SCHEMATICS
ELECTRONIC STEP CONTROLLER OR SCR CONTROL
D
D. Viconics Room Thermostat
without Remote Sensor for
Modulating Control: Use
this schematic if a Viconics
thermostat without remote
sensor is used to control the
heater.
E
E. Viconics Room Thermostat
with Remote Sensor for
Modulating Control: Use this
schematic if a Viconics ther-
mostat with remote sensor is
used to control the heater.
4
SIGNAL
MODULE
INTERFACE
DUCT HEATER
3
2
1
3
4
5
6
7
COMMON
24 VAC
0 TO 10 VDC
REMOTE SENSOR
Vdc PULSED
ROOM THERMOSTAT
VICONICS C1025-11
WITHOUT REMOTE SENSOR
4
SIGNAL
MODULE
INTERFACE
DUCT HEATER
3
2
1
3
4
5
6
7
COMMON
24 VAC
0 TO 10 VDC
REMOTE SENSOR
Vdc PULSED
REMOTE SENSOR
VICONICS S61
ROOM THERMOSTAT
VICONICS C1025-11
WITH REMOTE SENSOR
DIP SWITCH SETTINGS
ROOM THERMOSTAT
SWITCH S1
SETTING
S2
10
NOTE: DO NOT ADJUST DIP SWITCHES ON THERMOSTAT
4
SIGNAL
MODULE
INTERFACE
DUCT HEATER
3
2
1
3
4
5
6
7
COMMON
24 VAC
0 TO 10 VDC
REMOTE SENSOR
Vdc PULSED
ROOM THERMOSTAT
VICONICS C1025-11
WITHOUT REMOTE SENSOR
4
SIGNAL
MODULE
INTERFACE
DUCT HEATER
3
2
1
3
4
5
6
7
COMMON
24 VAC
0 TO 10 VDC
REMOTE SENSOR
Vdc PULSED
REMOTE SENSOR
VICONICS S61
ROOM THERMOSTAT
VICONICS C1025-11
WITH REMOTE SENSOR
DIP SWITCH SETTINGS
ROOM THERMOSTAT
SWITCH S1
SETTING
S2
10
NOTE: DO NOT ADJUST DIP SWITCHES ON THERMOSTAT

ELECTRIC DUCT HEATER
RENEWAIRE.COM INSTALLATION, OPERATION AND MAINTENANCE MANUAL 1.800.627.4499
20
COMMISSIONING
START-UP
ELECTRICAL REQUIREMENTS
Refer to attached wiring diagram and wiring
diagram on inside of cover. Make sure line and
control voltage of system matches that noted on
wiring diagram.
Wire in accordance with N.E.C. and any existing
local codes.
Check tightness of all factory and field electrical
connections.
Make sure fan interlock is wired in if the Heater
does not have an air flow switch.
Use 90 deg. C (194 deg. F) copper wire.
Control must be wired for N.E.C. Class 1 unless
otherwise specified.
GENERAL OPERATING REQUIREMENTS
Minimum Air Velocity: 70 CFM per KW (75-80 Recommended)
Maximum Inlet Air Temp: 100 Deg. F
Maximum Heater KW: 30 KW per square foot of duct cross section (EK-series)
Most models may be flipped and rotated.
Note: Minimum air flow or greater must be maintained uniformly over the entire face of the heater.
The velocity of air should NEVER be lower than the specified minimum. In cases where this is not true
the KW must be reduced or the velocity of air increased.
Note: Observe at least one Heating cycle to ensure that cycling of safety limit controls does not occur
under normal operating conditions before leaving the installation.
When Heater has integral transformer for control
voltage to thermostat, use thermostat with
isolating contacts to prevent interconnection of
Class 2 outputs.
Disconnect all electrical power before servicing.
When servicing heater, make sure all components
are repositioned in the proper location and
reconnect per wiring diagram.
Replacement parts must be identical to the original
components.
Contact factory for replacement parts.
Note: The air temperature
entering the duct heater should
not exceed those marked on the
heater nameplate label.
This electric duct heater is
intended for heating general
ventilation air only. Do not use in
airstreams containing hazardous
or explosive materials or vapors.
WARNING