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p r o c e s s d u c t h e a t e r s
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Introduction
Heatrex designs and manufactures commercial and industrial electric heating and control systems that set the industry standard for excellence. The company’s heating solutions reflect more than 80 years of innova-tion, product quality and efficient service.Heatrex Process Duct Heaters are your solution for heating forced air in industrial systems efficiently and economically. Our reputation has been built on cus-tom designed heaters where we control the complete design and manufacturing process. This includes the manufacture of heating elements; complex metal framing; control enclosures and electronic controls. Whatever your application, Heatrex can design and provide a high quality process duct heater to meet your requirements.
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Table of Contents
Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5
open Coil Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Finned Tubular Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Tubular Heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
250° F Construction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Engineering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-9
Selection Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Choosing the Correct Watt Density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Circuit Sizing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Pressure Drop Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Calculating KW Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Special Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10-13
Custom Designs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14-16
Installation Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17-20
Heater Listings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21-39
250° F Maximum outlet Air Temperature . . . . . . . . . . . . . . . . . . . . . . .21-24
400° F Maximum outlet Air Temperature . . . . . . . . . . . . . . . . . . . . . . .25-28
600° F Maximum outlet Air Temperature . . . . . . . . . . . . . . . . . . . . . . .29-32
750° F Maximum outlet Air Temperature . . . . . . . . . . . . . . . . . . . . . . .33-36
1200° F Maximum outlet Air Temperature . . . . . . . . . . . . . . . . . . . . . .37-39
Control Panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40-42
How to order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
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Construction
All Heatrex process duct heaters are designed and built with the following construction features to assure the highest quality and long service life.
Minimum bracket spacing reduces coil sag.
Galvanized steel framing up to 250° F outlet air; Aluminized steel framing up to 600° F outlet air; 304 stainless steel for higher temperatures.
Heavy gauge steel flange with pre-drilled mounting holes furnished for 400° F outlet air and higher.
Stainless steel terminal hardware and 10-32 threaded studs assure reli-able connections.
Louvered terminal box cover keeps connections and wiring at safe temperatures.
Pressure connectors welded or bolted to bus bars furnished for field wiring of 8 gauge and heavier.
Removable bus bars are secured with stainless steel nuts and shakeproof wash-ers.
1” of insulation in terminal box standard for outlet temperatures up to 750° F. 4” insulation below mounting flange stan-dard for 1200° F construction. Optional for other constructions.
Multiple concentric knockouts on all sides of the terminal box for convenient conduit entry.
80/20 Nichrome coils for minimum sag and maxi-mum life.
Rib-strengthened brackets with formed gussets at cor-ners for rigidity.
Open Coil Heaters
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Construction
Aluminized steel support brackets with flared openings allow elements to expand and contract smoothly.
Elements are .475” diameter, 304 stainless steel. Corrugated fins, 1-1/8” O.D. are the same material.
Heavy steel or stainless steel flange with pre-drilled mounting holes fur-nished for 400° F outlet air and higher.
Multiple concentric knockouts on all sides of the terminal box for conve-nient conduit entry.
Stainless steel terminal hardware and 10-32 threaded studs assure reliable connections.
Removable bus bars are secured with stainless steel nuts and shakeproof washers.
Terminal box may be side or top mounted.
Louvered terminal box cover keeps connections and wiring at safe tem-peratures.
Individually replaceable elements mounted to the terminal flange with push nuts.
Optional 4” insulation below mounting flange cuts energy losses through oven walls, keeps electrical connections cool. 1” of insulation in terminal box is stan-dard for 400° and 600° F outlet air.
1/2” diameter steel rods tie the assem-bly together in a rigid, yet expandable, mode.
Open framework allows universal mounting. Use with horizontal or vertical airflow.
Pressure connectors welded or bolted to bus bars furnished for field wiring of 8 gauge and heavier.
Finned Tubular Heaters
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Construction
Tubular Heaters
Heavy steel or stainless steel flange with pre-drilled mounting holes.
Multiple concentric knockouts on all sides of the terminal box for convenient conduit entry.
Louvered terminal box cover keeps connections and wiring at safe tem-peratures.
Pressure connectors welded or bolted to bus bars furnished for field wiring of 8 gauge and heavier.
Removable bus bars are secured with stainless steel nuts and shakeproof wash-ers.
Individually replaceable elements mounted to the terminal flange with push nuts.
Stainless steel terminal hardware and 10-32 threaded studs assure reli-able connections.
304 stainless steel support brackets with contoured openings to allow the elements to expand and contract smoothly.
1/2” diameter steel rods tie the assembly together in a rigid, yet expandable, mode.
Recompressed bends eliminate hairline cracks in insulation, extending element life.
Elements are .475” diameter Incoloy 800 sheath.
Unique bending configuration reduc-es the number of element terminals by more than half, lowering terminal box temperatures.
Terminal box may be side or top mounted.
1” of insulation in terminal box standard for outlet temperatures up to 750° F. 4” insulation below mounting flange standard for 1200° F construction. Optional for other constructions.
Open framework allows universal mounting. Use with horizontal or vertical airflow.
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Construction/Typical Applications
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• Aircraft Manufacturing• Air Curtains• Air Drying• Annealing• Booster Heating• Baking• Batch Heating• Chemical Processing• Cooking• Core Drying• Cryogenic Exhaust
Gas Heating
• Curing• Dehumidification• Dehydrating• Drying• Exhaust Gas Heating• Film Drying• Finishing Systems• Food Processing• Fruit Ripening• Heat Recovery Supplement• Heat Treating
• Hopper Heating• Ink Drying• Laboratory Testing• Make-up Air Heating• Metal Finishing• Motor Winding Burnoff• Paint Baking/Drying• Pharmaceutical
Manufacturing• Plastic Curing• Preheating• Reheating
• Roasting (nut, coffee, corn, etc.)
• Semi-Conductor Manufacturing
• Sterilizing• Standby Heating• Textile Drying• Varnish Drying• Wire Manufacturing
250° F ConstructionLow temperature heaters, suitable for 250° F maximum outlet air, are available in both open coil and finned tubular constructions. They are identical to the heaters described on pages 2 and 3 except for the following features.
• The steel flange is omitted. The heater is attached to the oven or duct wall with sheet metal screws through the base of the terminal box.
• Individually replaceable finned tubular elements are flange mounted.
• The terminal box has 1” of insulation.
• A galvanized steel channel frame is provided on three sides, with the element support brackets welded to the frame.
Heatrex Process Duct Heaters are installed in plenums, ducts or pipes to heat forced air in industrial equipment and systems. A wide variety of heater designs and sizes are avail-able to provide outlet air temperatures up to 1200° F. The air can be either recirculated or fresh. Recirculated air is used to reduce power consumption and heater size.
Fresh air is used when ventilation of the process is necessary.
Process duct heaters are installed in ovens, furnaces, autoclaves, dryers, conveyor systems, pressure vessels, and other equip-ment to supply the precise amount of clean heat for:
Typical Applications
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Selection Guide
Factor Open Coil Finned Tubular Tubular
1200° F maximum
The lightest of all three types.
Resistance coils, exposed directly to airstream, run cooler than coils imbedded in sheathed elements.
Lowest pressure drop due to large percentage of open space.
Large clearances between live parts and ground enable open coil heaters
to withstand severe applications.
Since element is electrically live, do not use if element may be
touched by conductive material or personnel.
Use only with clean air free ofconductive particles or water spray.
Open coil heaters are mostsusceptible to damage due to
physical abuse.
Airflow must be uniformlydistributed to prevent hot spots.
Pressure plates can help evenout airflow.
Maximum air velocity of 2500 SFPM
Open coil heaters respond quickly to step control because of low
thermal inertia. This can produce temperature fluctuations if control
system does not compensate.
For most applications, open coil heaters are more economical
because manufacturing operations are simpler.
600° F maximum
Heavier than open coil. Additional support required for horizontally
mounted units, especially for extra long heaters.
Coils run hotter than open coil, but cooler than tubular due to heat
transfer effect of fins.
Lower pressure drop than tubular, but higher than open coil.
Clearances between live parts and sheath are small, but filled with
compacted insulation.
Because the coil is enclosed in a metal sheath, shock hazard due to
contact is eliminated.
Can be used with air containing water droplets or conductive par-ticles unless particles are likely to
build up between fins.
Finned tubular heaters can with-stand more physical abuse than
open coil.
Finned tubular heaters are most tolerant of nonuniform airflow.
Hot spots tend to be dissipated by sheath and fins.
Maximum air velocity of 5000 SFPM
High thermal inertia makes finned tubular heaters slower to respond,
but can produce more uniform temperatures if control system is
properly designed.
Generally more expensive than open coil, but less expensive than
tubular because watt densities are higher.
1200° F maximum
Heavier than open coil. Additional support required for horizontally
mounted units, especially for extra long heaters.
Coils run hotter than open coil or finned tubular. Temperatures are kept within safe limits by reducing
watt densities.
Highest pressure drop becauseof high percentage of space
occupied by tubes.
Clearances between live parts and sheath are small, but filled with
compacted insulation.
Because the coil is enclosed in a metal sheath, shock hazard due to
contact is eliminated.
Can be used with virtually any type of air quality.
Tubular heaters are leastsusceptible to damage due to
physical abuse.
Less susceptible to hot spots than open coil, but more susceptible
than finned tubular.
Maximum air velocity of 8000 SFPM
Thermal inertia is greater than open coil, but less than finned tubular.
Generally most expensive of the three because of conservative, high
temperature design.
Outlet Air Temperature
Weight
Coil Temperature
Pressure Drop
Electrical Clearance
Safety
Air Quality
Mechanical Stability
Airflow Uniformity
Velocity
Controllability
Cost
Engineering Information
Table I
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Choosing the Correct Watt DensityWatt density (watts/sq. in. of element surface area) is a criti-cal factor in heater selection. If the watt density is too high for the application, the heater will fail prematurely. If the watt density is too low, the heater cost will be high. Proper watt density is a function of three variables: Heater construction, maximum outlet air temperature and air velocity. Having chosen the construction, watt density can be determined from Table II below, based on temperature and velocity.
Circuit SizingAll standard heaters in the listings have circuits that draw a maximum of 48 amps. This enables the use of 50 amp con-tactors and 60 amp fuses which are generally less expensive than higher rated devices.
For certain applications, however, it may be desirable to have larger circuits – e.g. for use with large SCR controls or to reduce the number of incoming power conductors. In these cases, larger circuits up to approximately 300 amps can be provided. However, in the tubular and finned tubular con-structions, circuiting must be consistent with the number of ele-ments shown in the listings.
The heater listings are labeled for various outlet air tem-peratures. The assumed minimum velocity and design watt density are shown at the top of each table. If the velocity in your application is lower than indicated in the heater listing, choose a lower watt density from Table II. If your velocity is substantially higher than shown in the heater listing, check it against the values in the table. You may be able to use a higher watt density at a lower price.
Engineering Information
Maximum Watt Densities At Outlet Temperatures And Velocities Shown
Maximum Watt Densities At Outlet Temperatures And Velocities Shown
Open Coil Construction Finned Tubular Construction
Outlet Temperature Outlet Temperature
250° F 400° F 500° F 600° F 750° F 1000° F 1200° F 250° F 400° F 500° F 600° F
300 55 45 35 30 25 15 10 45 40 35 30
600 60 55 50 45 30 20 10 55 50 40 35
900 65 65 60 55 35 25 15 65 65 55 45
1200 65 65 65 65 40 30 20 65 65 60 55
1600 65 65 65 65 55 40 25 65 65 65 65
2000 65 65 65 65 65 50 30 65 65 65 65
Tubular Construction
Outlet Temperature 750° F 1000° F 1200° F
13 6 3
22 12 7
25 18 12
30 22 16
40 30 22
45 35 25
400° F 500° F 600° F
20 18 16
24 22 22
28 25 25
30 30 30
40 40 40
45 45 45
MinimumVelocity In
Standard FPM
MinimumVelocity In
Standard FPM
Table II
250° F
22
28
32
35
45
45
300
600
900
1200
1600
2000
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Engineering Information
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Static pressure drop as a function of air velocity is shown below. Open coil heaters have the lowest pressure drop. Smaller fan motors can often be used with this design. Pressure drop values provided in Charts A through C are based on the airflow being
parallel to the heater C dimension.
For tubular design only, consult factory for pressure drop when airflow is parallel to the H dimension.
500 800 1200 2000400 600 1000 1500
.40
.30
.25
.20
.15
.10
.08
.06
.05
.04
.03
.025
.02
.015
C =
18-3
/8”
C =
14” o
r 16”
C =
6”, 8
” or 9
.5”
Max
imum
Pre
ssur
e Dr
op In
Inch
es o
f Wat
er
Velocity in SFPMChart AOpen Coil Design
300 500 800 1200 2000400 600 1000 1500
1 .6
1 .2
1 .0
.80
.60
.50
.40
.30
.20
.16
.12
.10
.08
.06
.05
.04
.03
C =
18-3
/8”
C =
9 .5”
Velocity in SFPM
Max
imum
Pre
ssur
e Dr
op In
Inch
es o
f Wat
er
Chart CTubular Design
300 500 800 1200 2000
300 500 800 1200 2000
400 600 1000 1500
400 600 1000 1500
.80
.60
.50
.40
.30
.20
.16
.12
.10
.08
.06
.05
.04
.03
TUBU
LAR
FINN
ED T
UBUL
AR
oPEN
CoI
L
Velocity in SFPM
Max
imum
Pre
ssur
e Dr
op In
Inch
es o
f Wat
er
Chart DComparative Pressure Drop Through All Three Designs at 9.5” C Dimension
Chart BFinned Tubular Design
.50
.40
.30 .25
.20
.15
.10
.08
.06
.05
.04
.03
.025
.02
.015
C =
9 .5”
or 1
6”
C =
6” o
r 8”
Velocity in SFPM
Max
imum
Pre
ssur
e Dr
op In
Inch
es o
f Wat
er
Pressure Drop Curves
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Engineering Information
9
Calculating KW RequirementsOnce the volume of air in standard cubic feet per minute (SCFM) and the required temperature rise in °F ( T) are known, the required kilowatt rating (KW) of the heater can be determined from the following formula:
Note that CFM is given at standard conditions (SCFM): 80°F and normal atmospheric pressure of 15 psi. The CFM at a higher pressure (P) and inlet air temperature (T) may be cal-culated as follows:
Example:
A drying oven, operating at 25 psia (10 psi gauge pressure), recirculates 3000 cubic feet of air per minute through a heater which raises its temperature from 350 to 400° F.
To select an appropriate heater:
Step 1: Convert 3000 CFM at 25 psia and 350° F to CFM at standard conditions using the above formula:
Step 2: Calculate the required KW:
Step 3: Calculate the maximum heater face area (WxH) that will result in an air velocity above the minimum required for standard heater listings:
The 400° F listing on pages 25 through 28 are based on 900 SFPM velocity. Thus, the
Step 4: Select a heater rated for at least 52 KW with a face area of 3.7 sq. ft. or less.
On page 26 is a group of 54 KW heaters, the first of which has an area of 12” x 30” = 1.0’ x 2.5’ = 2.5 sq. ft. This item is therefore appropriate. Select either Catalog No. HX-166N-635-401U (finned tubular) or HX-165N-335-401U (open coil). Both are rated 65 watts/sq. in.
Note: If a larger face area is required, a lower watt density must be selected. For example, if the heater face is 24” wide x 30” high, the velocity will be:
Per Table II, 400° F outlet air and 600 SFPM velocity require maximum watt densities of 55 watts/sq. in. for open coil and 50 watts/sq. in. for finned tubular. Since the 600° F listings on pages 29 through 32 are based upon watt densities of 55 and 45 for open coil and finned tubular respectively, a heater may be selected from this table. The 54 KW item, Catalog No. HX-166N-848-601U (finned tubular) or Catalog No. HX-165N-148-601U (open coil) may be used.
SCFM x T3193
KW = = 52 KW3333 x (400° F – 350° F)3193
KW =
SCFM = CFM x
SCFM = 3000 x = 3333 SCFM
x
x
P15
25 psia15
540(350° F + 460)
540(T+460)
= = 3 .7 sq . ft . 3333 SCFM900 SFPMMaximumFace Area
= = 667 SFPM 3333 SCFM2 .0’ x 2 .5’ 3333 SCFM
24” x 30”
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Special Features
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A wide variety of special features can be incorporated into Heatrex process duct heaters. Please contact us if you have other requirements.
Built-in Controls
(Available for heaters operating up to 150° F outlet air temperature.)
Built-in contactors, fuses, control transformers, and disconnect switches save installation labor and provide single source responsibility for the heater-control package.
Built-in Thermostat
(Available for heaters operating up to 150° F outlet air temperature.)
For automatic control of outlet air temperature. Adjustable over a range of 60-250° F. Outlet tem-perature will be lower than set point as the thermostat senses heat from elements as well as outlet air. Do not use where outlet air temperature will exceed 150° F. May also be used as an automatic high tem-perature thermal cutout.
Built-in Combination Thermostat/Thermal Cutout
(Available for heaters operating up to 150° F outlet air temperature.)
Control normally cycles the heater on and off, but shuts the heater down until reset button is pressed if temperature rise is more than 50° F above the control set point. (60-250° F range).
Remote Mounted Thermostats
For air temperature control or high temperature thermal cutout protection, a bulb and capillary type thermostat can be mounted in a cool location up to 8’ away from the heater. A well is provided to mount the thermostat bulb into the airstream. Two models are available:
DA1-6E96: 200-550° FDA1-6F96: 300-700° F
Built-in Thermocouple
Built-in sheathed thermocouple available for high temperature limit. This can be mounted in the airstream or clamped to a tubular/finned tubular element to prevent overheating.
Built-in Airflow Switch
(Available for heaters operating up to 150° F outlet air temperature.)
A diaphragm-operated differential pressure switch normally prevents the heater from operating unless the air is flowing. It senses pressure between process air and the terminal housing.
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Special Features
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Moisture-Resistant Element Seal
RTV or epoxy seals are inserted into each end of tubular or finned tubular elements. Recommended when heater may be stored in high humidity or where terminals are exposed to high humidity during operation.
Flanged Duct Mounting
For attaching heater to external duct flanges. No internal support required. Note that heater face dimensions W and H match the inside dimensions of the duct. While integral flange design is a standard option on the 250° F Construction, other heaters can be supplied with separate flange mounted plenum sections where required.
Flanged Terminal Box
A 1” full flange at end of terminal box is available for mounting heater. Especially useful when heater is mounted inside an oven, where ready access to electrical connections and mini-mum terminal box size are desirable. No terminal box cover is supplied.
Isolated Junction Box
Power connections are housed in a separate isolated junction box, factory connected to heating element terminals. Used where field wiring is not suitable for high ambient temperatures.
Angle Iron Frame
(Available for all tubular and finned tubular heaters except those with 250° F Construction.)
Support rods are replaced by heavy angle iron welded to element supports and terminal box. May increase C and H dimensions. Specify steel or stainless steel angle iron.
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Special Features
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Special Materials
Nonstandard fin, sheath and frame materials available for special applications.
Finned tubular elements available with Monel sheath and fins. Tubular elements available in Monel, 304 and 316 stainless steel and Inconel sheath. Other element diameters and sheath materials are available to meet your custom design requirements. Stainless steel frames available for all constructions.
Nonstandard Circuiting
Additional circuits available on standard heaters. However, number of circuits must be consistent with number of elements in tubular and finned tubular constructions. Number of cir-cuits shown in standard listings can also be reduced for high amperage SCR control.
Insulation Under Mounting Flange
Insulation is furnished under mounting flange to save energy and reduce terminal housing temperatures. This is standard on 1200° F Construction and optional on all others.Dust-Tight Terminal Box
For dirty environments. Boxes are welded, stainless steel with hinged, latched cover and Scru-tite hubs for incoming power.
Insulation under the mounting flange is required for all heaters operating above 250° F outlet air.
Special Wattage, Voltage and Dimensions
Heatrex specializes in custom designed process duct heaters.
Voltages up to 600V are available in single or three phase.
Airtight Terminal Box
(Available for all tubular and finned tubular heaters except those with 250° F Construction.)
Terminal box isolated from the duct or oven with compression fittings on each element to prevent leakage of process air into terminal box.
N” INSULATIoN
H
W6”
C
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Special Features
Special Cold Ends
To clear oven wall or to place active portion of heating element well into airstream, long cold ends may be provided. All heat-ers have 2” cold ends as standard.
Pressure Plate
A 40% open pressure plate on the inlet side of the heater evens out the airflow pattern where it is not normally uniform. A pressure plate significantly increases the pressure drop across the heater, as shown in the chart.
Top Mounted Heater Construction
A special top mounted design is available on open coil heaters. This feature allows easier installation when there are space restrictions on the sides of the heater but access is available from the top. In these applications, the coils are strung hori-zontally for proper heating of the airflow.
1 .0
.80 .60
.50
.40 .30
.25
.20
.15
.10
.08 .06
.05
.04 .03
.02
.015
300 500 800 1200 2000200 400 600 1000 1500
Velocity in SFPM
Max
imum
Pre
ssur
e Dr
op In
Inch
es o
f Wat
er
H
W
6"
N" INSULATION
Front View
C
MOUNTING FLANGE
Side View
Chart EPressure Drop
H
H
W
C
6”
N” INSULATIoN
MoUNTING FLANGE
W
C
6”
CoLDEND
Side View
Front View
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Custom Designs
Heatrex has the ability to customize heaters for unusual or special applications. The following are a few examples of our construction and design capabilities.
Crucible PreheaterFour flanged tubular heaters are mounted into an insulated cap and factory wired to a common junction box (not shown) in the center. The heaters preheat the air in a crucible to 1000° F before molten aluminum is poured into it. This energy saving design replaced an open gas flame which was shot into the crucible before pouring. The low watt density elements generate no heat in the U-bent portions so as to concentrate the heat in the crucible’s vertical walls. Terminal boxes are ventilated to prevent overheating of internal wir-ing. One set of incoming power lines feeds the entire 60 KW load.
Autoclave HeaterThis 1500 KW heater accommodates a fan in the center that can either draw or blow air through the open coils. The assembly is typically mounted on the door of an airtight batch oven, eliminating duct work. The design assures uniform air distribution over the coils without a pressure plate or other air straightening device. Units can be built to customer-specified KW ratings, inside and outside diameters, and for outlet tem-peratures up to 750° F. Field power connections are made to terminals inside the donut.
Two of 15 modules, each rated 624 KW, producing a total of 9360 KW in an autoclave installed in an aircraft facility. Structural components of the aircraft are made from light-weight composites such as boron or graphite fibers bonded with epoxy. Thin sheets of the metal are cut with computer-ized cutting equipment, layered in a crisscross pattern, then bonded together in the autoclave at pressures up to 300 psi and temperatures up to 1300° F. A nitrogen atmosphere prevents combustion of volatile vapors given off as the epoxy cures. Severe space limitations dictated a unique bus bar pat-tern, resulting in terminals at both ends of each module.
Processing Agricultural ProductsThis assembly of heaters, angle iron rack frame and panel-boards is typical of systems built to process agricultural prod-ucts. Applications include drying barley for malt production and dehydrating alfalfa for animal feed. Ratings up to 4300 KW in a single assembly and multi-heater installations up to 72,000 KW have been furnished. The finned tubular design is usually recommended because of environmental job con-ditions. Heatrex designs and builds all components of the system, giving the owner a turn-key installation. Electric heat is normally preferred over gas since there are no products of combustion, making the end product suitable for human con-sumption.
Custom Designs
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Custom Designs
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Ripening Room HeaterHeater installed in a package unit that maintains proper temperature and humidity in produce storage rooms. Typical applications include banana ripening and potato or apple stor-age. Stainless steel finned tubular elements, complete with moisture-proof seals, withstand corrosion caused by water carry-over from the cooling coil and gases released in the rip-ening process. Heater has built-in controls.
Ink DryingFiltered room air passes over this open coil heater (terminal box only shown) through a high speed blower. The 250° F pressurized air is then piped to a printing press where it bom-bards the web at a high velocity to evaporate and scrub off ink solvents. Solvent laden air is vacuumed away from the press and back to the dryer by a second high speed blower, then exhausted through a vent.
Environmental Test Chamber HeaterThis 543 KW heater operates in an environmental chamber where aircraft components are tested at temperatures up to 1475° F. Stainless steel rods are welded to the bus bars link-ing the elements together to form circuits of various KW rat-ings. The rods are bent at 90° and project through the wall of the test chamber so that incoming power connections can be made in a cool location. The entire unit is made from stainless steel.
Paint Curing SystemPart of a shipment of 26 identical tubular oven heaters, rated 240 KW each, to dry paint at temperatures ranging from 300° F to 700° F. Eighteen heaters are installed in a 4320 KW electro-coat cure oven and the remaining eight in a 1920 KW flow-coat cure oven at a tractor fabrication plant. Factory fur-nished vertical bus bars connect directly to bus duct feeding the entire system. Heating elements are individually replace-able and are secured to the insulated terminal box with com-pression fittings to prevent air leakage. Each heater slides into the oven on roller bearings to facilitate maintenance. Each oven is divided into several zones and the entire load is SCR controlled.
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Installation Guidelines
800-394-6589www.heatrex.com16
Custom Designs
Bonding OvenThis 13 foot long, 550 KW heater is installed in a batch oven for drying sealants and curing adhesives on parts wrapped in fiberglass for the aerospace industry. This unit replaced a series of open coil heaters, whose coils shorted out due to fiberglass filings in the airstream. It heats 39,000 SCFM of air to 610° F.
Load BankThis 126 KW open coil load bank was built to test large stand-by generators. With the use of a separate control panel, the 22 circuit design allows for testing of variable resistance loads at different RPM levels. Routine testing with load banks con-firms that generators are functioning properly and are ready for use when needed. This is critical for facilities that cannot be without power, such as hospitals, police stations, fire sta-tions or prisons. Load banks are also used in the testing of main or stand-by generators found on commercial or military aircraft and nuclear submarines.
High Temperature Core ConstructionThis unit produces 1400° F air for hot forming titanium used in aircraft components. Open coil elements are wound on grooved, ceramic cores, resulting in an extremely compact design: The heated chamber produces 60 KW, but measures only 18” cubed. The heater slips through the top of the fur-nace, with an insulation plug under the mounting flange that matches the thickness of the furnace wall. Electrical connec-tions are made externally to stainless steel lugs, factory weld-ed to stainless bus bars that interconnect the elements below.
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Installation Guidelines
800-394-6589www.heatrex.com17
Open Coil Heaters must be mounted horizontally for either horizontal or vertical airflow.
Tubular and Finned Tubular Heaters may be mounted either horizontally or vertically. When mounted horizontally, the air-flow may be either horizontal or vertical. When mounted ver-tically, the airflow must be horizontal. All tubular and finned tubular heaters, except those rated for 250° F air, may be rotated 90° about a horizontal axis to fit the available space. For example, a heater 16” high (H dimension) and 9.5” deep (C dimension) may be mounted with either the 9.5” dimension or the 16” dimension parallel to the airflow.
Mounting
Open Coil Heater Mounted For Horizontal Airflow
Horizontally Mounted Tubular Or Finned Tubular Heater
Vertically Mounted Tubular Or Finned Tubular Heater
Open Coil HeaterMounted For Vertical Airflow
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Installation Guidelines
800-394-6589www.heatrex.com18
Installation Guidelines
Support
If the heater is mounted through an opening in an insulated wall, special precautions must be taken to insure that the entire heated length is in the airstream. Otherwise, the elements shadowed by the insulation will overheat and burn out.
Open Coil heaters designed for 1200° F air are provided with 4” of insulation under the mounting plate. If the insulated oven wall is thicker than 4”, additional insulation should be provided in the heater. Heaters rated for lower outlet air temperatures may also be provided with insulation under the mounting plate or with extended terminal cold sections to clear the oven wall. The standard open coil construction will clear up to 2” of insulation without modification.
Finned Tubular heaters may also be provided with insulation under the mounting plate or extended cold sections. Heaters will clear 2” of insulation without modification.
Tubular heaters rated for 1200° F outlet air are provided with 4” of insulation under the mounting flange, which should be extended for heavier oven walls. Heaters rated for 750° F outlet air may also be provided with 4” of insulation under the mount-ing plate, or may safely be installed through a wall up to 2” thick without modification.
Insulation
Low Temperature Heaters, suitable for 250° F maximum outlet air, are attached to the ductwork or oven wall with sheet metal screws through the base of the terminal box, as shown.
Higher Temperature Heaters, those rated for 400° F air and higher, must be bolted to the duct or oven wall using the bolt holes provided in the steel flange at the base of the terminal box. Weld nuts or captive nuts may be provided in the wall or a mating flange can be provided in the field.
All Horizontally Mounted Heaters, except those weighing less than 25 lbs., should be supported inside the oven or duct with rails or hangers. Heaters mounted vertically through the top of the oven or duct need not be supported internally. However, the structure should be adequate to carry the entire heater weight.
Installation Of 250° F Heater
Installation Of Heater Rated For 400° F And Higher
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800-394-6589www.heatrex.com
Installation Guidelines
19
To prevent overheating under adverse conditions, overtem-perature protection is recommended. Four types of protective devices are available:
Thermal Cutout – A thermostat, set approximately 50° higher than normal operating temperature, can be built into heaters rated for 250° F maximum outlet air. The built-in thermostat or built-in combination thermostat/thermal cutout can be used for this purpose. For higher temperature heaters, a remote thermostat may be used as a thermal cutout.
Built-in Thermocouple – A thermocouple, sensing sheath or air temperature, can be wired to a remotely mounted ther-mocouple controller, set approximately 50° F above normal operating temperature. The controller then acts as a thermal cutout.
Built-in Airflow Switch – A differential pressure type airflow switch may be built into 150° F heaters. By sensing the dif-ference in pressure between the process air and the outside atmosphere, it will shut down the heater when there is a sud-den drop in process pressure.
Fan Interlock Relay – A relay interlocking the fan motor with the heater control circuit will shut down the heater if there is no power to the fan. Note, however, that this device does not protect against a stalled motor nor against a blockage in the airstream that would result in little or no airflow, even though the fan is running.
Overtemperature ProtectionAll heaters in the listings are designed for 480 volts, three phase. Therefore, three power leads must be brought into the heater for each circuit through the knockouts provided in the terminal box. The number of circuits is shown in the listings. The current drawn by each circuit is calculated as follows:
All wiring should be per the National Electrical Code and any special provisions in local codes. Wiring insulation must be suitable for the terminal box ambient temperature as deter-mined from Chart F. Note that lower temperature wiring insulation may be used on heaters with insulation under the mounting flange.
Field Wiring
Line Current = Circuit KW x 1000
Voltage x 1.73
Chart FTerminal Box Temperature
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Installation Guidelines Heater Listings
Heater Adjacent To Transition
Heater Partially Blocked By Filter Or Frame Member
Heater Too Close To Elbow
Heater Too Close To Fan
800-394-6589www.heatrex.com20
To prevent hot spots, airflow must be uniformly distributed across the heater face. These drawings illustrate typical heat-er misapplications which result in nonuniform airflow. If one or more of these conditions cannot be avoided, consult Heatrex for assistance. In most cases we can provide a pressure plate or nonheated zones in the heater to overcome these prob-lems.
Airflow Uniformity
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Heater Listings
250° F Maximum Outlet Air Temperature
4.56999
121313181818181822242727
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Finned Tubular Construction65 Watts/Sq. In.
Open Coil Construction65 Watts/Sq. In.
Heater Listings - 250° F at 900 SFPM Minimum Airflow
1216122024161230121620243612161220
88
1288
12168
201612128
24203016
88888888888888888
1010101010101510151515151520202520
1015201515202520303025252535354535
HX-166N-401-201UHX-166N-402-201UHX-166N-403-201UHX-166N-404-201UHX-166N-405-201UHX-166N-406-201UHX-166N-407-201UHX-166N-408-201UHX-166N-409-201UHX-166N-410-201UHX-166N-411-201UHX-166N-412-201UHX-166N-413-201UHX-166N-414-201UHX-166N-415-201UHX-166N-416-201UHX-166N-417-201U
HX-165N-501-201UHX-165N-502-201UHX-165N-503-201UHX-165N-504-201UHX-165N-505-201UHX-165N-506-201UHX-165N-507-201UHX-165N-508-201UHX-165N-509-201UHX-165N-510-201UHX-165N-511-201UHX-165N-512-201UHX-165N-513-201UHX-165N-514-201UHX-165N-515-201UHX-165N-516-201UHX-165N-517-201U
33633693
129663
1512189
11111111111111111
11111111111111111
800-394-6589www.heatrex.com21
Heaters are rated at 480 volts, 3 phase.
Finned Tubular Open Coil
HEATER DEPTH
TERMINAL BOXWIDTH (C + 3”)
H HH+2H+2
W
C
M
W6” 6”
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800-394-6589www.heatrex.com22
Heater Listings Heater Listings
250° F Maximum Outlet Air Temperature
Heaters are rated at 480 volts, 3 phase.
2727303136363636364040424545454850545454545454586063636366676772727272727678
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Finned Tubular Construction65 Watts/Sq. In.
Open Coil Construction65 Watts/Sq. In.
Heater Listings - 250° F at 900 SFPM Minimum Airflow
2430161212162024361230161220241612121620243036121612202416123012162024361216
1612243438302020124216342424243830304230302016342434343430382438303838204234
888888888888
16888
161688888
16161688
16168
1616888
1616
2015202530252025203525302525303535354030353025353035354040403540404045304545
35354050555040454060455565505065707570606055558575907070809565
1009080806565
105
HX-166N-418-201UHX-166N-419-201UHX-166N-420-201UHX-166N-421-201UHX-166N-422-201UHX-166N-423-201UHX-166N-424-201UHX-166N-425-201UHX-166N-426-201UHX-166N-427-201UHX-166N-428-201UHX-166N-429-201UHX-166N-430-201UHX-166N-431-201UHX-166N-432-201UHX-166N-433-201UHX-166N-434-201UHX-166N-435-201UHX-166N-436-201UHX-166N-437-201UHX-166N-438-201UHX-166N-439-201UHX-166N-440-201UHX-166N-441-201UHX-166N-442-201UHX-166N-443-201UHX-166N-444-201UHX-166N-445-201UHX-166N-446-201UHX-166N-447-201UHX-166N-448-201UHX-166N-449-201UHX-166N-450-201UHX-166N-451-201UHX-166N-452-201UHX-166N-453-201UHX-166N-454-201UHX-166N-455-201U
HX-165N-518-201UHX-165N-519-201UHX-165N-520-201UHX-165N-521-201UHX-165N-522-201UHX-165N-523-201UHX-165N-524-201UHX-165N-525-201UHX-165N-526-201UHX-165N-527-201UHX-165N-528-201UHX-165N-529-201UHX-165N-530-201UHX-165N-531-201UHX-165N-532-201UHX-165N-533-201UHX-165N-534-201UHX-165N-535-201UHX-165N-536-201UHX-165N-537-201UHX-165N-538-201UHX-165N-539-201UHX-165N-540-201UHX-165N-541-201UHX-165N-542-201UHX-165N-543-201UHX-165N-544-201UHX-165N-545-201UHX-165N-546-201UHX-165N-547-201UHX-165N-548-201UHX-165N-549-201UHX-165N-550-201UHX-165N-551-201UHX-165N-552-201UHX-165N-553-201UHX-165N-554-201UHX-165N-555-201U
96
1521241812126
279
21301515243336271818129
393042212133451548362424125139
11111111122222222222222222222232222233
111111111222222222222222222222
22222222
-
Heater Listings
800-394-6589www.heatrex.com23
Heaters are rated at 480 volts, 3 phase.
250° F Maximum Outlet Air Temperature
8181818184909090909595
100100102108108108108108117117122126126126135135135135144144144150153153162162162162
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Finned Tubular Construction65 Watts/Sq. In.
Open Coil Construction65 Watts/Sq. In.
Heater Listings - 250° F at 900 SFPM Minimum Airflow
122024301616202436301620241616202430362024302024362020243020243630202420243036
424242303438242424343830304242303038303434423434343838382438383830424242423042
16888
1616161688
1616161616161688
16168
16168
1616161616168
1616161616168
454550454550404540505045555555455555505060605560556055655555656065607060706565
110858580
10011095958090
11510510512013011011010095
120120110125130110135135135125145145125135155155160160145135
HX-166N-456-201UHX-166N-457-201UHX-166N-458-201UHX-166N-459-201UHX-166N-460-201UHX-166N-461-201UHX-166N-462-201UHX-166N-463-201UHX-166N-464-201UHX-166N-465-201UHX-166N-466-201UHX-166N-467-201UHX-166N-468-201UHX-166N-469-201UHX-166N-470-201UHX-166N-471-201UHX-166N-472-201UHX-166N-473-201UHX-166N-474-201UHX-166N-475-201UHX-166N-476-201UHX-166N-477-201UHX-166N-478-201UHX-166N-479-201UHX-166N-480-201UHX-166N-481-201UHX-166N-482-201UHX-166N-483-201UHX-166N-484-201UHX-166N-485-201UHX-166N-486-201UHX-166N-487-201UHX-166N-488-201UHX-166N-489-201UHX-166N-490-201UHX-166N-491-201UHX-166N-492-201UHX-166N-493-201UHX-166N-494-201U
HX-165N-556-201UHX-165N-557-201UHX-165N-558-201UHX-165N-559-201UHX-165N-560-201UHX-165N-561-201UHX-165N-562-201UHX-165N-563-201UHX-165N-564-201UHX-165N-565-201UHX-165N-566-201UHX-165N-567-201UHX-165N-568-201UHX-165N-569-201UHX-165N-570-201UHX-165N-571-201UHX-165N-572-201UHX-165N-573-201UHX-165N-574-201UHX-165N-575-201UHX-165N-576-201UHX-165N-577-201UHX-165N-578-201UHX-165N-579-201UHX-165N-580-201UHX-165N-581-201UHX-165N-582-201UHX-165N-583-201UHX-165N-584-201UHX-165N-585-201UHX-165N-586-201UHX-165N-587-201UHX-165N-588-201UHX-165N-589-201UHX-165N-590-201UHX-165N-591-201UHX-165N-592-201UHX-165N-593-201UHX-165N-594-201U
542727184245303015214833335154363624183939274242214545453048482433515154543627
333333333433333334344544444454446555565
333333333333333333333444
444444444445555
-
Heater ListingsHeater Listings
250° F Maximum Outlet Air Temperature
24800-394-6589www.heatrex.com
175180189198202216216230234243252270288306324
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Finned Tubular Construction65 Watts/Sq. In.
Open Coil Construction65 Watts/Sq. In.
Heater Listings - 250° F at 900 SFPM Minimum Airflow
303630363030363036303636363636
342434303838304234423438384242
161616161616161616161616161616
70607075808075858585859095
100100
155150165165180190180200195210205220235245260
HX-166N-495-201UHX-166N-496-201UHX-166N-497-201UHX-166N-498-201UHX-166N-499-201UHX-166N-500-201UHX-166N-501-201UHX-166N-502-201UHX-166N-503-201UHX-166N-504-201UHX-166N-505-201UHX-166N-506-201UHX-166N-507-201UHX-166N-508-201UHX-166N-509-201U
HX-165N-595-201UHX-165N-596-201UHX-165N-597-201UHX-165N-598-201UHX-165N-599-201UHX-165N-600-201UHX-165N-601-201UHX-165N-602-201UHX-165N-603-201UHX-165N-604-201UHX-165N-605-201UHX-165N-606-201UHX-165N-607-201UHX-165N-608-201UHX-165N-609-201U
393042334548365139544245485154
757688697978899
555566666777889
Heaters are rated at 480 volts, 3 phase.
-
Heater Listings
800-394-6589www.heatrex.com25
400° F Maximum Outlet Air Temperature
Open Coil
4.56999
1213131818181818
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Finned Tubular Construction65 Watts/Sq. In.
Open Coil Construction65 Watts/Sq. In.
Heater Listings - 400° F at 900 SFPM Minimum Airflow
12161220241612301216202436
88
1288
12168
201612128
6666666666666
10101015151515151515152020
15152015152530203530252520
HX-166N-601-401UHX-166N-602-401UHX-166N-603-401UHX-166N-604-401UHX-166N-605-401UHX-166N-606-401UHX-166N-607-401UHX-166N-608-401UHX-166N-609-401UHX-166N-610-401UHX-166N-611-401UHX-166N-612-401UHX-166N-613-401U
HX-165N-301-401UHX-165N-302-401UHX-165N-303-401UHX-165N-304-401UHX-165N-305-401UHX-165N-306-401UHX-165N-307-401UHX-165N-308-401UHX-165N-309-401UHX-165N-310-401UHX-165N-311-401UHX-165N-312-401UHX-165N-313-401U
33633693
129663
1111111111111
1111111111111
Heaters are rated at 480 volts, 3 phase.
Mounting Hole Details – Mounting hole patterns depend on heater C and H dimensions. Mounting holes are 9/32” diam-eter, centered 3/8” from the outside edge of the plate.
AIRFLOW DIRECTION
AIRFLOW DIRECTION
KNOCKOUTS ON ALL SIDES
KNOCKOUTS ON ALL SIDES
H
W
H
C
C
W
6”
6”
Finned Tubular
Heater Depth CMtg. Hole Centers K
Heater Height HNo. of Spaces P
Mtg. Hole Centers Q
6”2”8”
23”
9.5”3.5”12”
33.75”
16”3
4.25”
20”3
5.25”
24”3
5.75”
30”5
4.88”
34”7
4.38”
38”7
4.88”
42”7
5.25”
K
Q
K
C+2”
H+2”
P x Q
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Heater ListingsHeater Listings
26800-394-6589www.heatrex.com
400° F Maximum Outlet Air Temperature
22242727272730313636363636404042454545485054545454545458606363636667677272727272
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Finned Tubular Construction65 Watts/Sq. In.
Open Coil Construction65 Watts/Sq. In.
Heater Listings - 400° F at 900 SFPM Minimum Airflow
12161220243016121216202436123016122024161212162024303612161220241612301216202436
24203016161224343830202012421634242424383030423030201634243434343038243830383820
6666666666666666
9.5666
9.59.566666
9.59.59.566
9.59.56
9.59.5666
15202020202020202525202525252530252530303030353035303030303035403535353535354035
454055353530506070604545357545657555557590958570705550
10085
105808095
11570
120105909065
HX-166N-614-401UHX-166N-615-401UHX-166N-616-401UHX-166N-617-401UHX-166N-618-401UHX-166N-619-401UHX-166N-620-401UHX-166N-621-401UHX-166N-622-401UHX-166N-623-401UHX-166N-624-401UHX-166N-625-401UHX-166N-626-401UHX-166N-627-401UHX-166N-628-401UHX-166N-629-401UHX-166N-630-401UHX-166N-631-401UHX-166N-632-401UHX-166N-633-401UHX-166N-634-401UHX-166N-635-401UHX-166N-636-401UHX-166N-637-401UHX-166N-638-401UHX-166N-639-401UHX-166N-640-401UHX-166N-641-401UHX-166N-642-401UHX-166N-643-401UHX-166N-644-401UHX-166N-645-401UHX-166N-646-401UHX-166N-647-401UHX-166N-648-401UHX-166N-649-401UHX-166N-650-401UHX-166N-651-401UHX-166N-652-401UHX-166N-653-401U
HX-165N-314-401UHX-165N-315-401UHX-165N-316-401UHX-165N-317-401UHX-165N-318-401UHX-165N-319-401UHX-165N-320-401UHX-165N-321-401UHX-165N-322-401UHX-165N-323-401UHX-165N-324-401UHX-165N-325-401UHX-165N-326-401UHX-165N-327-401UHX-165N-328-401UHX-165N-329-401UHX-165N-330-401UHX-165N-331-401UHX-165N-332-401UHX-165N-333-401UHX-165N-334-401UHX-165N-335-401UHX-165N-336-401UHX-165N-337-401UHX-165N-338-401UHX-165N-339-401UHX-165N-340-401UHX-165N-341-401UHX-165N-342-401UHX-165N-343-401UHX-165N-344-401UHX-165N-345-401UHX-165N-346-401UHX-165N-347-401UHX-165N-348-401UHX-165N-349-401UHX-165N-350-401UHX-165N-351-401UHX-165N-352-401UHX-165N-353-401U
151218996
1521241812126
279
21301515243336271818129
39304221213345154836242412
1111111111111222222222222222222222322222
111111111111122
2222222222222222222222222
Heaters are rated at 480 volts, 3 phase.
-
Heater Listings
800-394-6589www.heatrex.com27
400° F Maximum Outlet Air Temperature
76788181818184909090909595
100100102108108108108108117117122126126126135135135135144144144150153153162162162
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Finned Tubular Construction65 Watts/Sq. In.
Open Coil Construction65 Watts/Sq. In.
Heater Listings - 400° F at 900 SFPM Minimum Airflow
12161220243016162024363016202416162024303620243020243620202430202436302024202430
42344242423034382424243438303042423030383034344234343438383824383838304242424230
9.59.59.5666
9.59.59.59.566
9.59.59.59.59.59.59.566
9.59.56
9.59.56
9.59.59.59.59.59.56
9.59.59.59.59.59.5
35403540454540453545404545455045454550505050555550555555556555556560656070607065
13011013510010085
1201301001008095
135115115145150120120110100135135120140140115150150150125160160130140170170180180150
HX-166N-654-401UHX-166N-655-401UHX-166N-656-401UHX-166N-657-401UHX-166N-658-401UHX-166N-659-401UHX-166N-660-401UHX-166N-661-401UHX-166N-662-401UHX-166N-663-401UHX-166N-664-401UHX-166N-665-401UHX-166N-666-401UHX-166N-667-401UHX-166N-668-401UHX-166N-669-401UHX-166N-670-401UHX-166N-671-401UHX-166N-672-401UHX-166N-673-401UHX-166N-674-401UHX-166N-675-401UHX-166N-676-401UHX-166N-677-401UHX-166N-678-401UHX-166N-679-401UHX-166N-680-401UHX-166N-681-401UHX-166N-682-401UHX-166N-683-401UHX-166N-684-401UHX-166N-685-401UHX-166N-686-401UHX-166N-687-401UHX-166N-688-401UHX-166N-689-401UHX-166N-690-401UHX-166N-691-401UHX-166N-692-401UHX-166N-693-401U
HX-165N-354-401UHX-165N-355-401UHX-165N-356-401UHX-165N-357-401UHX-165N-358-401UHX-165N-359-401UHX-165N-360-401UHX-165N-361-401UHX-165N-362-401UHX-165N-363-401UHX-165N-364-401UHX-165N-365-401UHX-165N-366-401UHX-165N-367-401UHX-165N-368-401UHX-165N-369-401UHX-165N-370-401UHX-165N-371-401UHX-165N-372-401UHX-165N-373-401UHX-165N-374-401UHX-165N-375-401UHX-165N-376-401UHX-165N-377-401UHX-165N-378-401UHX-165N-379-401UHX-165N-380-401UHX-165N-381-401UHX-165N-382-401UHX-165N-383-401UHX-165N-384-401UHX-165N-385-401UHX-165N-386-401UHX-165N-387-401UHX-165N-388-401UHX-165N-389-401UHX-165N-390-401UHX-165N-391-401UHX-165N-392-401UHX-165N-393-401U
51395427271842453030152148333351543636241839392742422145454530484824335151545436
3333333333343333333434454444444444455554
223333333333333
3333333444444444444444555
Heaters are rated at 480 volts, 3 phase.
-
Heater ListingsHeater Listings
28800-394-6589www.heatrex.com
400° F Maximum Outlet Air Temperature
162175180189198202216216230234243252270288306324
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumber
CHW
KWWeight(Lbs.)
Finned Tubular Construction65 Watts/Sq. In.
Open Coil Construction65 Watts/Sq. In.
Heater Listings - 400° F at 900 SFPM Minimum Airflow
36303630363030363036303636363636
42342434303838304234423438384242
69.59.59.59.59.59.59.59.59.59.59.59.59.59.59.5
6570607075808075858585859095
100100
145165150175170190200180215195220210225240255265
HX-166N-694-401UHX-166N-695-401UHX-166N-696-401UHX-166N-697-401UHX-166N-698-401UHX-166N-699-401UHX-166N-700-401UHX-166N-701-401UHX-166N-702-401UHX-166N-703-401UHX-166N-704-401UHX-166N-705-401UHX-166N-706-401UHX-166N-707-401UHX-166N-708-401UHX-166N-709-401U
HX-165N-394-401UHX-165N-395-401UHX-165N-396-401UHX-165N-397-401UHX-165N-398-401UHX-165N-399-401UHX-165N-400-401UHX-165N-401-401UHX-165N-402-401UHX-165N-403-401UHX-165N-404-401UHX-165N-405-401UHX-165N-406-401UHX-165N-407-401UHX-165N-408-401UHX-165N-409-401U
27393042334548365139544245485154
5755656667778899
5555566666777889
Heaters are rated at 480 volts, 3 phase.
-
Heater Listings
800-394-6589www.heatrex.com29
Heaters are rated at 480 volts, 3 phase.
600° F Maximum Outlet Air Temperature
45
7.589
101012121515
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Finned Tubular Construction45 Watts/Sq. In.
Open Coil Construction55 Watts/Sq. In.
Heater Listings - 600° F at 900 SFPM Minimum Airflow
1216201224162612321620
888
128
128
168
1612
66666666666
1010151015151515151515
1520202520302035254035
HX-166N-801-601UHX-166N-802-601UHX-166N-803-601UHX-166N-804-601UHX-166N-805-601UHX-166N-806-601UHX-166N-807-601UHX-166N-808-601UHX-166N-809-601UHX-166N-810-601UHX-166N-811-601U
HX-165N-101-601UHX-165N-102-601UHX-165N-103-601UHX-165N-104-601UHX-165N-105-601UHX-165N-106-601UHX-165N-107-601UHX-165N-108-601UHX-165N-109-601UHX-165N-110-601UHX-165N-111-601U
33363639396
11111111111
11111111111
Finned Tubular
Open Coil
AIRFLOW DIRECTIONAIRFLOW DIRECTION
KNOCKOUTS ON ALL SIDES
KNOCKOUTS ON ALL SIDES
H
W
H
C
C
W
6”
6”
Heater Depth CMtg. Hole Centers K
Heater Height HNo. of Spaces P
Mtg. Hole Centers Q
6”2”8”
23”
9.5”3.5”12”
33.75”
16”3
4.25”
20”3
5.25”
24”3
5.75”
30”5
4.88”
34”7
4.38”
38”7
4.88”
42”7
5.25”
Mounting Hole Details – Mounting hole patterns depend on heater C and H dimensions. Mounting holes are 9/32” diam-eter, centered 3/8” from the outside edge of the plate.
K
Q
K
C+2”
H+2”
P x Q
-
800-394-6589www.heatrex.com30
Heater Listings
600° F Maximum Outlet Air Temperature
151618202020222424252728303030303235363636374040404545454545484850505252545556
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Finned Tubular Construction45 Watts/Sq. In.
Open Coil Construction55 Watts/Sq. In.
Heater Listings - 600° F at 900 SFPM Minimum Airflow
401224121626201232162412162026401216122432201216261216202440123216261220241612
82012242012163012241634302016123834422016242438263042302416302024243434303034
6666666666666666666666
9.566
9.56666
9.56
9.56
9.566
9.59.5
201520152020202020202020252025252525252525252530253035303035303030303035353530
25453555503545704060508075605045858595655570959565
110105857565
11575
10580
13010095
120135
HX-166N-812-601UHX-166N-813-601UHX-166N-814-601UHX-166N-815-601UHX-166N-816-601UHX-166N-817-601UHX-166N-818-601UHX-166N-819-601UHX-166N-820-601UHX-166N-821-601UHX-166N-822-601UHX-166N-823-601UHX-166N-824-601UHX-166N-825-601UHX-166N-826-601UHX-166N-827-601UHX-166N-828-601UHX-166N-829-601UHX-166N-830-601UHX-166N-831-601UHX-166N-832-601UHX-166N-833-601UHX-166N-834-601UHX-166N-835-601UHX-166N-836-601UHX-166N-837-601UHX-166N-838-601UHX-166N-839-601UHX-166N-840-601UHX-166N-841-601UHX-166N-842-601UHX-166N-843-601UHX-166N-844-601UHX-166N-845-601UHX-166N-846-601UHX-166N-847-601UHX-166N-848-601UHX-166N-849-601UHX-166N-850-601U
HX-165N-112-601UHX-165N-113-601UHX-165N-114-601UHX-165N-115-601UHX-165N-116-601UHX-165N-117-601UHX-165N-118-601UHX-165N-119-601UHX-165N-120-601UHX-165N-121-601UHX-165N-122-601UHX-165N-123-601UHX-165N-124-601UHX-165N-125-601UHX-165N-126-601UHX-165N-127-601UHX-165N-128-601UHX-165N-129-601UHX-165N-130-601UHX-165N-131-601UHX-165N-132-601UHX-165N-133-601UHX-165N-134-601UHX-165N-135-601UHX-165N-136-601UHX-165N-137-601UHX-165N-138-601UHX-165N-139-601UHX-165N-140-601UHX-165N-141-601UHX-165N-142-601UHX-165N-143-601UHX-165N-144-601UHX-165N-145-601UHX-165N-146-601UHX-165N-147-601UHX-165N-148-601UHX-165N-149-601UHX-165N-150-601U
3126
151269
186
159
21181296
242127129
15302412332718159
361230153921183342
111111111111111111111111122222222222222
1111111111111111111111
11122222222222222
Heaters are rated at 480 volts, 3 phase.
Heater Listings
-
800-394-6589www.heatrex.com31
6060606060606464646868707072727275757580808082858590909090909698
100100105105108108110
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Finned Tubular Construction45 Watts/Sq. In.
Open Coil Construction55 Watts/Sq. In.
Heater Listings - 600° F at 900 SFPM Minimum Airflow
121620263240241216201216261224321620401626242032161620242640202024262040243226
383038302420343834424234344238303824243838423034424230244230343430243434304230
9.59.566666
9.59.56
9.59.56
9.566
9.59.56
9.56
9.59.56
9.59.59.59.566
9.59.59.59.59.56
9.59.59.5
353535353540403540403540403540454535454545704550454545455055555050455060509055
1451251101009085
105150140125160145115170120110160125105165130155145125175185150140145125140165155145175145165175165
HX-166N-851-601UHX-166N-852-601UHX-166N-853-601UHX-166N-854-601UHX-166N-855-601UHX-166N-856-601UHX-166N-857-601UHX-166N-858-601UHX-166N-859-601UHX-166N-860-601UHX-166N-861-601UHX-166N-862-601UHX-166N-863-601UHX-166N-864-601UHX-166N-865-601UHX-166N-866-601UHX-166N-867-601UHX-166N-868-601UHX-166N-869-601UHX-166N-870-601UHX-166N-871-601UHX-166N-872-601UHX-166N-873-601UHX-166N-874-601UHX-166N-875-601UHX-166N-876-601UHX-166N-877-601UHX-166N-878-601UHX-166N-879-601UHX-166N-880-601UHX-166N-881-601UHX-166N-882-601UHX-166N-883-601UHX-166N-884-601UHX-166N-885-601UHX-166N-886-601UHX-166N-887-601UHX-166N-888-601UHX-166N-889-601U
HX-165N-151-601UHX-165N-152-601UHX-165N-153-601UHX-165N-154-601UHX-165N-155-601UHX-165N-156-601UHX-165N-157-601UHX-165N-158-601UHX-165N-159-601UHX-165N-160-601UHX-165N-161-601UHX-165N-162-601UHX-165N-163-601UHX-165N-164-601UHX-165N-165-601UHX-165N-166-601UHX-165N-167-601UHX-165N-168-601UHX-165N-169-601UHX-165N-170-601UHX-165N-171-601UHX-165N-172-601UHX-165N-173-601UHX-165N-174-601UHX-165N-175-601UHX-165N-176-601UHX-165N-177-601UHX-165N-178-601UHX-165N-179-601UHX-165N-180-601UHX-165N-181-601UHX-165N-182-601UHX-165N-183-601UHX-165N-184-601UHX-165N-185-601UHX-165N-186-601UHX-165N-187-601UHX-165N-188-601UHX-165N-189-601U
453624181512214839275142215424184530154824273321545436302718244233304221362733
2222222222223322555223
11333353347
1157733
11
2222222222222222222222
33333333333333333
Heaters are rated at 480 volts, 3 phase.
Heater Listings
600° F Maximum Outlet Air Temperature
-
Heater ListingsHeater Listings
800-394-6589www.heatrex.com32
600° F Maximum Outlet Air Temperature
112117120120120120125127130132135135135140145145150150155155160160165170170180180180190195205210215225240255270
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Finned Tubular Construction45 Watts/Sq. In.
Open Coil Construction55 Watts/Sq. In.
Heater Listings - 600° F at 900 SFPM Minimum Airflow
20242026324024202632202440262432264024322624403226263240324032403240404040
38343830243834423430423842343830382442343842303442423830383442344238384242
9.59.59.59.59.56
9.59.59.59.59.59.56
9.59.59.59.59.59.59.59.59.59.59.59.59.59.59.59.59.59.59.59.59.59.59.59.5
555555555565556060656065756065657070707570708575757580858090909590
100100110110
190185200175165160195215195185220210180205220200220190235215230245215230250260245230260250280265290285300320335
HX-166N-890-601UHX-166N-891-601UHX-166N-892-601UHX-166N-893-601UHX-166N-894-601UHX-166N-895-601UHX-166N-896-601UHX-166N-897-601UHX-166N-898-601UHX-166N-899-601UHX-166N-900-601UHX-166N-901-601UHX-166N-902-601UHX-166N-903-601UHX-166N-904-601UHX-166N-905-601UHX-166N-906-601UHX-166N-907-601UHX-166N-908-601UHX-166N-909-601UHX-166N-910-601UHX-166N-911-601UHX-166N-912-601UHX-166N-913-601UHX-166N-914-601UHX-166N-915-601UHX-166N-916-601UHX-166N-917-601UHX-166N-918-601UHX-166N-919-601UHX-166N-920-601UHX-166N-921-601UHX-166N-922-601UHX-166N-923-601UHX-166N-924-601UHX-166N-925-601UHX-166N-926-601U
HX-165N-190-601UHX-165N-191-601UHX-165N-192-601UHX-165N-193-601UHX-165N-194-601UHX-165N-195-601UHX-165N-196-601UHX-165N-197-601UHX-165N-198-601UHX-165N-199-601UHX-165N-201-601UHX-165N-202-601UHX-165N-203-601UHX-165N-204-601UHX-165N-205-601UHX-165N-206-601UHX-165N-207-601UHX-165N-208-601UHX-165N-209-601UHX-165N-210-601UHX-165N-211-601UHX-165N-212-601UHX-165N-213-601UHX-165N-214-601UHX-165N-215-601UHX-165N-216-601UHX-165N-217-601UHX-165N-218-601UHX-165N-219-601UHX-165N-220-601UHX-165N-221-601UHX-165N-222-601UHX-165N-223-601UHX-165N-224-601UHX-165N-225-601UHX-165N-226-601UHX-165N-227-601U
45424836302442544233544527424836453054424854334254544536484251425448485454
574354767
11659744555745
1176656876768899
3333334444444444444445555555556666777
Heaters are rated at 480 volts, 3 phase.
-
800-394-6589www.heatrex.com33
Heater Listings
Heaters are rated at 480 volts, 3 phase.* On this item the C dimension is 14 inches for open coil.
Heater Depth CNo. of Spaces R
Mtg. Hole Centers KHeater Height HNo. of Spaces P
Mtg. Hole Centers Q
9.5” 14” 18.38” 2 3 4 3.5” 3.88” 3.88” 4” 6” 8” 10” 12” 14” 16” 18” 20” 22” 24” 26” 28” 30” 32” 34” 36” 38” 40” 42” 1 1 2 3 3 3 3 3 3 3 3 5 5 5 5 7 7 7 7 7 2.5” 3.5” 3” 2.75” 3.25” 3.75” 4.25” 4.75” 5.25” 5.75” 5.75” 4.5” 5.25” 4.88” 4.88” 4.38” 4.88” 4.88” 5.38” 5.25”
Tubular
1015152020222530303540
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Tubular Construction30 Watts/Sq. In.
Open Coil Construction40 Watts/Sq. In.
Heater Listings - 750° F at 1200 SFPM Minimum Airflow
20-3/820-3/8
6020-3/8
3544
20-3/820-3/8
6020-3/820-3/8
684
1066
12144
1618
9.59.59.59.59.59.59.59.59.5*9.59.5
2020352025302525353035
2025203525304045305560
HX-164N-301-701UHX-164N-302-701UHX-164N-303-701UHX-164N-304-701UHX-164N-305-701UHX-164N-306-701UHX-164N-307-701UHX-164N-308-701UHX-164N-309-701UHX-164N-310-701UHX-164N-311-701U
HX-165N-701-701UHX-165N-702-701UHX-165N-703-701UHX-165N-704-701UHX-165N-705-701UHX-165N-706-701UHX-165N-707-701UHX-165N-708-701UHX-165N-709-701UHX-165N-710-701UHX-165N-711-701U
333633666
1212
11111111112
11111111112
Mounting Hole Details – Mounting hole patterns depend on heater C and H dimensions. Mounting holes are 9/32” diameter, cen-tered 3/8” from the outside edge of the plate.
KNOCKOUTS ONALL SIDES
AIRFLOW DIRECTION
Open Coil
KNOCKOUTS ON ALL SIDES
KNOCKOUTS ON ALL SIDES
H
H W
W
C
C
6”
6”
750° F Maximum Outlet Air TemperatureAIRFLOW DIRECTION
AIRFLOW DIRECTION
K
Q
K
C+2”
H+2”
P x Q
-
Heater Listings
800-394-6589www.heatrex.com34
Heater Listings
750° F Maximum Outlet Air Temperature
4045454550606060677075758080909090
100100105110112120120120135135140140150157160160165180180180195200
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Tubular Construction30 Watts/Sq. In.
Open Coil Construction40 Watts/Sq. In.
Heater Listings - 750° F at 1200 SFPM Minimum Airflow
3520-3/8
4460
20-3/820-3/8
356044
20-3/820-3/8
6020-3/8
3520-3/8
4460
20-3/83960
20-3/8443539604460353560443535603544606035
82086
2226148
1426268
341838181042221042222226122214263414222634163422181834
9.5*9.59.59.59.59.59.59.59.59.59.59.5*9.59.59.59.59.59.59.59.5*9.59.59.59.59.59.59.59.59.59.59.59.59.59.5*9.59.59.59.59.5
303535404045455055454550555060655565605565756070657570708570757085808575858585
456545457585656070959570
11585
1259585
14010595
150115120125110130125140150135145155150180180160165175195
HX-164N-312-701UHX-164N-313-701UHX-164N-314-701UHX-164N-315-701UHX-164N-316-701UHX-164N-317-701UHX-164N-318-701UHX-164N-319-701UHX-164N-320-701UHX-164N-321-701UHX-164N-322-701UHX-164N-323-701UHX-164N-324-701UHX-164N-325-701UHX-164N-326-701UHX-164N-327-701UHX-164N-328-701UHX-164N-329-701UHX-164N-330-701UHX-164N-331-701UHX-164N-332-701UHX-164N-333-701UHX-164N-334-701UHX-164N-335-701UHX-164N-336-701UHX-164N-337-701UHX-164N-338-701UHX-164N-339-701UHX-164N-340-701UHX-164N-341-701UHX-164N-342-701UHX-164N-343-701UHX-164N-344-701UHX-164N-345-701UHX-164N-346-701UHX-164N-347-701UHX-164N-348-701UHX-164N-349-701UHX-164N-350-701U
HX-165N-712-701UHX-165N-713-701UHX-165N-714-701UHX-165N-715-701UHX-165N-716-701UHX-165N-717-701UHX-165N-718-701UHX-165N-719-701UHX-165N-720-701UHX-165N-721-701UHX-165N-722-701UHX-165N-723-701UHX-165N-724-701UHX-165N-725-701UHX-165N-726-701UHX-165N-727-701UHX-165N-728-701UHX-165N-729-701UHX-165N-730-701UHX-165N-731-701UHX-165N-732-701UHX-165N-733-701UHX-165N-734-701UHX-165N-735-701UHX-165N-736-701UHX-165N-737-701UHX-165N-738-701UHX-165N-739-701UHX-165N-740-701UHX-165N-741-701UHX-165N-742-701UHX-165N-743-701UHX-165N-744-701UHX-165N-745-701UHX-165N-746-701UHX-165N-747-701UHX-165N-748-701UHX-165N-749-701UHX-165N-750-701U
6969
15129
129
211515241218121830152133151818241827212130212433272724364230
23235232335543343533
11566463335766
1198675
2222222222223233333333
44444444455555556
Heaters are rated at 480 volts, 3 phase.* On this item the C dimension is 14 inches for open coil.
-
800-394-6589www.heatrex.com35
Heater Listings
750° F Maximum Outlet Air Temperature
200210220225225240240250255260270270280285290300300315315320330335340345360360360375380380390400405405420425435450450
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Tubular Construction30 Watts/Sq. In.
Open Coil Construction40 Watts/Sq. In.
Heater Listings - 750° F at 1200 SFPM Minimum Airflow
446035446035604460354460356044356044603560443560354460603544603544606044604460
262026262226223424323424322622322822303230223832382232343826363826383826402640
9.59.5
18-3/89.59.5
18-3/89.59.59.5
18-3/89.59.5
18-3/89.5
18-3/818-3/8
9.518-3/8
9.518-3/8
9.518-3/818-3/8
9.518-3/818-3/8
9.59.5
18-3/818-3/8
9.518-3/818-3/8
9.59.5
18-3/89.5
18-3/89.5
8590
12585
100125100105105150105105150115135150120135130150130135175135175135135145175155150175155160160155165155165
185190230200205240215225230270245240285255270300270285285315295300340310355315320335370340350385360360375375390390400
HX-164N-351-701UHX-164N-352-701UHX-164N-353-701UHX-164N-354-701UHX-164N-355-701UHX-164N-356-701UHX-164N-357-701UHX-164N-358-701UHX-164N-359-701UHX-164N-360-701UHX-164N-361-701UHX-164N-362-701UHX-164N-363-701UHX-164N-364-701UHX-164N-365-701UHX-164N-366-701UHX-164N-367-701UHX-164N-368-701UHX-164N-369-701UHX-164N-370-701UHX-164N-371-701UHX-164N-372-701UHX-164N-373-701UHX-164N-374-701UHX-164N-375-701UHX-164N-376-701UHX-164N-377-701UHX-164N-378-701UHX-164N-379-701UHX-164N-380-701UHX-164N-381-701UHX-164N-382-701UHX-164N-383-701UHX-164N-384-701UHX-164N-385-701UHX-164N-386-701UHX-164N-387-701UHX-164N-388-701UHX-164N-389-701U
HX-165N-751-701UHX-165N-752-701UHX-165N-753-701UHX-165N-754-701UHX-165N-755-701UHX-165N-756-701UHX-165N-757-701UHX-165N-758-701UHX-165N-759-701UHX-165N-760-701UHX-165N-761-701UHX-165N-762-701UHX-165N-763-701UHX-165N-764-701UHX-165N-765-701UHX-165N-766-701UHX-165N-767-701UHX-165N-768-701UHX-165N-769-701UHX-165N-770-701UHX-165N-771-701UHX-165N-772-701UHX-165N-773-701UHX-165N-774-701UHX-165N-775-701UHX-165N-776-701UHX-165N-777-701UHX-165N-778-701UHX-165N-779-701UHX-165N-780-701UHX-165N-781-701UHX-165N-782-701UHX-165N-783-701UHX-165N-784-701UHX-165N-785-701UHX-165N-786-701UHX-165N-787-701UHX-165N-788-701UHX-165N-789-701U
274233304536483354393654426039456042634866455472544872755751816054818457906090
97
1110568
1197
1297
10135
101478
11159
129
16121319179
10189
1419152015
6666677777778888888999
99
101010101010101111111111111212
Heaters are rated at 480 volts, 3 phase.
-
Heater Listings
36800-394-6589www.heatrex.com
750° F Maximum Outlet Air TemperatureLow Velocity Heater
Mounting Hole Details – Mounting hole patterns depend on H dimensions. Mounting holes are 9/32” diameter, centered 3/8” from the outside edge of the plate.
6121824303642485460
Dimensions(Inches)
No. OfCircuits
No. OfElements
CatalogNumberCHW
KWWeight(Lbs.)
Tubular Construction22 Watts/Sq. In.
Heater Listings - 750° F at 900 SFPM Minimum Airflow
20-3/820-3/820-3/820-3/820-3/820-3/820-3/820-3/820-3/820-3/8
468
10121416182022
8-11/168-11/168-11/168-11/168-11/168-11/168-11/168-11/168-11/168-11/16
15253545506570809095
HX-164N-901-701UHX-164N-902-701UHX-164N-903-701UHX-164N-904-701UHX-164N-905-701UHX-164N-906-701UHX-164N-907-701UHX-164N-908-701UHX-164N-909-701UHX-164N-910-701U
369
129
1815181818
1111111111
Heater Listings
Heaters are rated at 480 volts, 3 phase.
Heater Height HNo. of Spaces P
Mtg. Hole Centers Q
4” 6” 8” 10” 12” 14” 16” 18” 20” 22” 1 1 2 3 3 3 3 3 3 3 2.5” 3.5” 3” 2.75” 3.25” 3.75” 4.25” 4.75” 5.25” 5.75”
Tubular
KNOCKOUTS ONALL SIDES
AIRFLOW DIRECTION
KNOCKOUTS ON ALL SIDES
H
W
C
6”
AIRFLOW DIRECTION
K
Q
K
C+2”
H+2”
P x Q
-
Mounting Hole Details – Mounting hole patterns depend on heater C and H dimensions. Mounting holes are 9/32” diameter, cen-tered 3/8” from the outside edge of the plate.
Heater Listings
800-394-6589www.heatrex.com37
Heaters are rated at 480 volts, 3 phase.All 1200° F heaters come with 4” of insulation below flange.* On this item the C dimension is 14 inches for open coil.
1200° F Maximum Outlet Air Temperature
510101215152020242530303035
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Tubular Construction22 Watts/Sq. In.
Open Coil Construction25 Watts/Sq. In.
Heater Listings - 1200° F at 1600 SFPM Minimum Airflow
20-3/820-3/8
5635
20-3/844
20-3/85635
20-3/820-3/8
4456
20-3/8
464686
1048
121486
16
9.59.5*9.5*9.59.5*9.59.5*9.59.59.5*9.59.59.59.5*
-203530203025-
352530404030
2530253040355055506065555080
HX-164N-101-101UHX-164N-102-101UHX-164N-103-101UHX-164N-104-101UHX-164N-105-101UHX-164N-106-101UHX-164N-107-101UHX-164N-108-101UHX-164N-109-101UHX-164N-110-101UHX-164N-111-101UHX-164N-112-101UHX-164N-113-101UHX-164N-114-101U
-HX-165N-802-101UHX-165N-803-101UHX-165N-804-101UHX-165N-805-101UHX-165N-806-101UHX-165N-807-101U
-HX-165N-809-101UHX-165N-810-101UHX-165N-811-101UHX-165N-812-101UHX-165N-813-101UHX-165N-814-101U
3333636669969
12
11111111111111
-111111-111111
Open Coil
4” INSULATION
H
W
C
6”
Heater Depth CNo. of Spaces R
Mtg. Hole Centers KHeater Height HNo. of Spaces P
Mtg. Hole Centers Q
9.5” 14” 18.38” 2 3 4 3.5” 3.88” 3.88” 4” 6” 8” 10” 12” 14” 16” 18” 20” 22” 24” 26” 28” 30” 32” 34” 36” 38” 40” 42” 1 1 2 3 3 3 3 3 3 3 3 5 5 5 5 7 7 7 7 7 2.5” 3.5” 3” 2.75” 3.25” 3.75” 4.25” 4.75” 5.25” 5.75” 5.75” 4.5” 5.25” 4.88” 4.88” 4.38” 4.88” 4.88” 5.38” 5.25”
K
Q
K
C+2”
H+2”
P x Q
-
800-394-6589www.heatrex.com
Heater ListingsHeater Listings
38
1200° F Maximum Outlet Air Temperature
40404545485050606060607070727580808590909095
100100105108110110120120120130130135140150155160165170170180
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Tubular Construction22 Watts/Sq. In.
Open Coil Construction25 Watts/Sq. In.
Heater Listings - 1200° F at 1600 SFPM Minimum Airflow
20-3/856
20-3/84435
20-3/856
20-3/8354456
20-3/8563544
20-3/85635
20-3/8445635
20-3/8564435
20-3/8563544565635445656355644355635
188
201418228
2622181026102222341222382214224214222642162622181834262022382234382442
9.5*9.5*9.59.59.59.59.5*9.59.59.59.59.5*9.5*9.59.59.59.59.59.59.59.59.59.59.5*9.59.59.5*9.59.59.59.59.59.59.59.59.59.59.5*9.59.5
9.5
3550405555405045656555455565805565656080706565708075657575808585909090
100100100110100105110
8565958095
10575
12511510590
135100125130160115140180140130150200140155170210155180170170180210195195205245220240255230275
HX-164N-116-101UHX-164N-117-101UHX-164N-118-101UHX-164N-119-101UHX-164N-120-101UHX-164N-121-101UHX-164N-122-101UHX-164N-123-101UHX-164N-124-101UHX-164N-125-101UHX-164N-126-101UHX-164N-127-101UHX-164N-128-101UHX-164N-129-101UHX-164N-130-101UHX-164N-131-101UHX-164N-132-101UHX-164N-133-101UHX-164N-134-101UHX-164N-135-101UHX-164N-136-101UHX-164N-137-101UHX-164N-138-101UHX-164N-139-101UHX-164N-140-101UHX-164N-141-101UHX-164N-142-101UHX-164N-143-101UHX-164N-144-101UHX-164N-145-101UHX-164N-146-101UHX-164N-147-101UHX-164N-148-101UHX-164N-149-101UHX-164N-150-101UHX-164N-151-101UHX-164N-152-101UHX-164N-153-101UHX-164N-154-101UHX-164N-155-101UHX-164N-156-101UHX-164N-157-101U
HX-165N-816-101UHX-165N-817-101UHX-165N-818-101UHX-165N-819-101UHX-165N-820-101UHX-165N-821-101UHX-165N-822-101UHX-165N-823-101UHX-165N-824-101UHX-165N-825-101UHX-165N-826-101UHX-165N-827-101UHX-165N-828-101UHX-165N-829-101UHX-165N-830-101UHX-165N-831-101UHX-165N-832-101UHX-165N-833-101UHX-165N-834-101UHX-165N-835-101UHX-165N-836-101UHX-165N-837-101UHX-165N-838-101UHX-165N-839-101UHX-165N-840-101UHX-165N-841-101UHX-165N-842-101UHX-165N-843-101UHX-165N-844-101UHX-165N-845-101UHX-165N-846-101UHX-165N-847-101UHX-165N-848-101UHX-165N-849-101UHX-165N-850-101UHX-165N-851-101UHX-165N-852-101UHX-165N-853-101UHX-165N-854-101UHX-165N-855-101UHX-165N-856-101UHX-165N-857-101U
1212159
1215151815121824241815242424271827243030242733333024244236274245424836425445
22532552522442544433345543
11115447437578
6765
222222222222223333333333333444444444455555
Heaters are rated at 480 volts, 3 phase.* On this item the C dimension is 14 inches for open coil.
18-3/8
-
Heater Listings
800-394-6589www.heatrex.com39
1200° F Maximum Outlet Air Temperature
180190190195200205210210215220225230230240240240250250255260265270270275280285290290300300300315315325330335345360375390405420
Dimensions(Inches)
Weight(Lbs.)
No. OfCircuits
No. OfCircuits
No. OfElements
CatalogNumber
CatalogNumberCHW
KWWeight(Lbs.)
Tubular Construction22 Watts/Sq. In.
Open Coil Construction25 Watts/Sq. In.
Heater Listings - 1200° F at 1600 SFPM Minimum Airflow
565635445635445635564435563544565635445635445635564435563544563544354435444444444444
242642382826383026304226322642323432263632263832382632403826403832383238323238383838
9.59.59.59.59.5
18-3/89.59.5
18-3/89.59.5
18-3/89.5
18-3/89.59.59.5
18-3/818-3/8
9.518-3/818-3/8
9.518-3/8
9.518-3/818-3/8
9.518-3/818-3/8
9.518-3/818-3/818-3/818-3/818-3/818-3/818-3/818-3/818-3/818-3/818-3/8
105110110120120135125125135125135130130135135135140155165145155165155155155165155160180165160180195180195180195195225225225225
240255290280270310295285325295315335310345330320335380355350395370365405375385415390450400400465435475450485480480515530545560
HX-164N-158-101UHX-164N-159-101UHX-164N-160-101UHX-164N-161-101UHX-164N-162-101UHX-164N-163-101UHX-164N-164-101UHX-164N-165-101UHX-164N-166-101UHX-164N-167-101UHX-164N-168-101UHX-164N-172-101UHX-164N-173-101UHX-164N-174-101UHX-164N-175-101UHX-164N-176-101UHX-164N-177-101UHX-164N-178-101UHX-164N-179-101UHX-164N-180-101UHX-164N-181-101UHX-164N-182-101UHX-164N-183-101UHX-164N-184-101UHX-164N-185-101UHX-164N-186-101UHX-164N-187-101UHX-164N-188-101UHX-164N-189-101UHX-164N-190-101UHX-164N-191-101UHX-164N-192-101UHX-164N-193-101UHX-164N-194-101UHX-164N-195-101UHX-164N-196-101UHX-164N-197-101UHX-164N-198-101UHX-164N-199-101UHX-164N-200-101UHX-164N-201-101UHX-164N-202-101U
HX-165N-858-101UHX-165N-859-101UHX-165N-860-101UHX-165N-861-101UHX-165N-862-101UHX-165N-863-101UHX-165N-864-101UHX-165N-865-101UHX-165N-866-101UHX-165N-867-101UHX-165N-868-101UHX-165N-872-101UHX-165N-873-101UHX-165N-874-101UHX-165N-875-101UHX-165N-876-101UHX-165N-877-101UHX-165N-878-101UHX-165N-879-101UHX-165N-880-101UHX-165N-881-101UHX-165N-882-101UHX-165N-883-101UHX-165N-884-101UHX-165N-885-101UHX-165N-886-101UHX-165N-887-101UHX-165N-888-101UHX-165N-889-101UHX-165N-890-101UHX-165N-891-101UHX-165N-892-101UHX-165N-893-101UHX-165N-894-101UHX-165N-895-101UHX-165N-896-101UHX-165N-897-101UHX-165N-898-101UHX-165N-899-101UHX-165N-900-101UHX-165N-901-101UHX-165N-902-101U
546048426054426354664560726048728163547866548172846072908160908163816684727278788484
558756776
119565869797
11998758
109
1010979
117
12
1213131414
5555666666666777777777777888888889999
1010101111
Heaters are rated at 480 volts, 3 phase.
-
Control PanelsControl Panels
40800-394-6589www.heatrex.com
Amps Number OfCircuitsAmps Per
CircuitMaximum KW Approximate Dimensions (Inches)
Height Width Depth
EstimatedWeight(Lbs.)
4896
144192240288336384
432* 480* 528* 576* 624* 672* 720* 768* 816* 864* 912* 960*
123456789
1011121314151617181920
4848484848484848484848484848484848484848
1939597999
119139159179199219239259279299319339359379399
3979
119159199239279319359399438478518558598638678718758798
85105160175260265320330585600680685800805815930945950960965
2430364248486060606060607272727272727272
2424303036363636484860606060607272727272
88888888
121212121212121212121212
240V/3PH 480V/3PH
*These panels have double doors and 12” high floor stands.
Heatrex can provide a control system for any electric process air heating application. Our experienced engineering staff can design control systems ranging from ON/OFF to full SCR with PID logic. Optional features include ramp/soak, computer inter-face capability and various control schemes as required.
Heatrex offers two standard control panel designs: Full SCR PID control and ON/OFF contactor control. All components are factory mounted and wired in compliance with the National Electrical Code.
These charts provide a sample of standard control panel designs. Custom control panels, designed specifically for your application, are available.
A Vernier control panel can also be supplied. Vernier control utilizes contactors, one SCR controller, and a microprocessor-based sequencer. The sequencer controls the staging of the contactors and the SCR controller. The SCR controller serves to fill in the gaps between the step-controlled stages. Vernier control is not quite as accurate as full SCR control, but more accurate than contactor (step) control.
Contactor Control PanelsThis contactor-based system with ON/OFF process temperature control is recommended for less demanding applications. Systems with two or more heating stages utilize an electronic sequenc-er (step controller), driven by an analog output PID tempera-ture controller to minimize the amount of load cycling while providing good outlet temperature control.
Standard Features:• Microprocessor-based sequencer (for panels
with two or more heating stages)• Indicating PID temperature controller (adjustable process
temperature with thermocouple input)• NEMA 12 painted steel enclosure, wall mount unless
otherwise noted• Overtemperature controller (adjustable temperature limit
with thermocouple input)• Door interlock disconnect switch• Manual reset pushbutton with built-in pilot light (red) for
visual “OVERTEMPERATURE” alarm• Selector switch – ON/OFF with built-in pilot light (green) for
“POWER ON” indication• Control power transformer• Disconnecting magnetic contactors• Circuit fusing
-
Control Panels
41
A full SCR control system with PID temperature control is recommended for industrial heating applications which must accommodate material flow changes and provide the highest degree of accuracy for outlet temperature control.
Standard Features:• PID self-tuning temperature controller (adjustable process
temperature, with thermocouple input)• Three-phase, zero cross-fired, SCR power controllers• NEMA 12 painted steel enclosure, wall mount unles