Detroit Radiant Products LS Series User manual

WARNING
!
Improper installation, adjustment, alteration, service or maintenance can cause
property damage, injury or death. Read the installation, operation and maintenance
instructions thoroughly before installing or servicing this equipment.
This heater must be installed and serviced by trained gas installation and service
personnel only. Failure to comply could result in personal injury, asphyxiation, death,
fire or property damage.
Do not store or use gasoline or other flammable vapors and liquids in the vicinity of
this or any other appliance.
In locations used for the storage of combustible materials, signs must be posted to
specify the maximum permissible stacking height to maintain the required clearances
from the heater to the combustibles. Signs must either be posted adjacent to the
heater thermostats or in the absence of such thermostats, in a conspicuous location.
Do not use this heater in indoor living or sleeping quarters, etc.! Installation of
a tube heater system in residential indoor living spaces may result in property damage,
serious injury, asphyxiation or death.
LS Series
Installation Manual
The LS Series Infrared Tube Heater is a positive pressure, single stage radiant heater system. This
manual provides specific information related to the LS Series model. All persons involved with the
installation, operation and maintenance of the heater system must read and understand the information
in this manual.
For Your Safety
If you smell gas:
• Donottrytolightanyappliance. •Immediatelycallyourgassupplierfromaneighbor’sphone.
•Donottouchanyelectricalswitch. •Followthegassupplier’sinstructions.
•Donotuseanyphoneinyourbuilding. • Ifyoucannotreachyourgassupplier,calltheredepartment.
Keep these instructions for future reference.
LIOLS-Rev. 34512
Print:1M-5/12_r2-12/10/12(DRP)
Replaces:LIOLS-2M-11/09(CDS)

2
LS Series
Contents
1.0 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Overview ............................................................3
Specifications ........................................................3
Safety Signs and Labels ................................................4
2.0 Safety ...................................................................6
Warning Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Applications ..........................................................6
Standards, Certifications and Government Regulations ........................7
Clearance to Combustibles ..............................................8
3.0 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
  DesignConsiderationsandPrechecks .....................................10
Recommended Mounting Heights.........................................11
Hanger Placement and Suspension .......................................12
Radiant Tube Assembly.................................................16
Optional Elbow or U-Bend Accessory Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Burner Control Box Suspension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Reflector Assembly ....................................................20
Baffle Assembly and Placement ..........................................22
Final Heater Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Sidewall Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Rooftop Venting.......................................................26
Optional Unvented Operation ............................................28
Combustion Air Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Gas Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
  ElectricalRequirementsandDiagrams.....................................33
4.0 Operation ................................................................37
Lighting Procedures....................................................37
Sequence of Operation .................................................38
Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.0 Maintenance ..............................................................40
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Heater Components and Parts List ........................................44
Maintenance Checks...................................................46
Limited Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Kit Contents ..........................................................48
1.0 Introduction •Table of Contents

1.0 Introduction
3
LS Series
Overview
The intent of this manual is to provide information regarding safety, design guidelines, installation,
operation and maintenance of the tube heater. You must read and understand the instructions and all
safety warnings before installing the tube heater.
Heater Components
Priortoinstallation,verifythattheheater’sgastypeandvoltage(aslistedontheratingplate)match
that of your application. Also verify that you have received all heater components included with your
tube heater. Refer to page 48 for a list of the kit contents for your Series heater. Materials not included
intheheaterkitcontents(e.g.,screws,ventmaterial,terminals,etc.)aretheresponsibilityofthe
installer.NotifyyourproductrepresentativeorDetroitRadiantProductsofanydiscrepancyormissing
kit contents prior to installing unit.
Model Number Gas Type (select one) BTU/H Straight Length U-Tube Length Standard Weight (lbs.) Recommended Mounting Height** Combustion Chamber (Black Coated) Radiant Emitter Tube(s) (Black Coated) Residential Certification^
LS-10-25 N or LP 25,000 12’-1” N/A 70 lbs. 7’to11’ Titan Alum Yes
LS-10-30 N or LP 30,000 12’-1” N/A 70 lbs. 8’to11’ Titan Alum Yes
LS-10-40 N or LP 40,000 12’-1” N/A 70 lbs. 10’to14’ Titan Alum No
LS-15-40 N or LP 40,000 16’-10” N/A 85 lbs. 8’to13’ Titan Alum Yes
LS-15-50 N or LP 50,000 16’-10” N/A 85 lbs. 10’to15’ Titan Alum No
LS-20-40 N or LP 40,000 21’-10” 13’-0” 100 lbs. 8’to13’ Titan Alum Yes
LS-20-50 N or LP 50,000 21’-10” 13’-0” 100 lbs. 9’to15’ Titan Alum No
LS-30-50* N or LP 50,000 31’-7” 17’-8” 120 lbs. 9’to14’ Titan Alum Yes
Specifications
Chart 1.1 • LS Series Specifications
*ModelrequiresDB-5EA-SUBoptionalaccessorypackagewheninstallingina‘U’conguration(P/N:DB-TF1B).
** Recommended mounting heights are provided as a guideline. Actual conditions may dictate variations from this
 data.Optionalprotectiveguard(P/N:PG)isrequiredwhenmountingbelow8-ft.
^ Certified models may be installed in attached residential garages/workshops.
Titan = Black coated titanium stabilized aluminized steel.
Alum = Black coated aluminized treated steel.
1.0 Introduction •Overview •Heater Components •Specifications

WARNING
!
4
LS Series
SERVICE ACCESS PANEL
IGNITER & FLAME SENSE COMPARTMENT
1. Turn off gas & electricity.
2. Remove cover by lifting top
cover upward and outward.
CAUTION: HOT SURFACE.
KEEP COVER IN PLACE. REMOVE FOR SERVICE ONLY.
1.0 Introduction • Safety Signs and Labels
Safety Signs and Labels
Safety warning labels must be maintained on the tube heater and should be replaced if they become
illegible. Contact either your local distributor or the product manufacturer for obtaining replacement signs
or labels.
It is important to provide warnings to alert individuals to potential hazards and safety actions. In locations
used for the storage of combustible materials, ANSI Z83.20b and CSA 2.34 require a placard to be
posted “specifying the maximum permissible stacking height to maintain the required clearances from the
heatertothecombustibles”neartheheatersthermostatorinabsenceofsuchthermostatsina
conspicuouslocation.ContactDetroitRadiantProductsCo.oranauthorizeddealerforClearanceSafety
LimitSignsorforClearanceSafetyLimitTags(onetagisprovidedwitheachheater).
Improper installation, adjustment, alteration, service or maintenance can cause
property damage, serious injury or death. Read and understand, the installation,
operating and maintenance instructions thoroughly before installing or servicing this
equipment. Only trained, qualified gas installation and service personnel may install or
service this equipment.
SERVICE ACCESS PANEL
IGNITER & FLAME SENSE COMPARTMENT
1. Turn off gas & electricity.
2. Remove cover by lifting top
cover upward and outward.
CAUTION: HOT SURFACE.
KEEP COVER IN PLACE. REMOVE FOR SERVICE ONLY.
AVOID EQUIPMENT FAILURE
THIS 10 FT. TUBE IS THE
COMBUSTION CHAMBER.
THIS TUBE MUST BE THE FIRST TUBE
FOLLOWING THE BURNER CONTROL BOX.
!
INSTALLER
The combustion chamber utilizes either 409
stainless, titanium alloy or aluminized steel -
depending on the model number of your heater.
Rotate the tube’s welded seam to bottom.
Consult the manual(s) for further details.
F/N: LLTB026
Right Panel
(ValveCompartment)
Al-Ti Combustion
Chamber
16”Burner
Tube
F/N: LLTB004
(orange)
F/N: LL01 - Clearance Safety Tag
(Afxadjacenttoheater’sthermostat)
Aluminized
RadiantTube(s)
(ifapplicable)
F/N: LLTCL002
Lighting Instructions

5
LS Series
NEUTRAL
EARTH
HOT
- 120V HEATERINPUT -
120V
®
DETROITRADIANT PRODUCTS COMPANY
21400 HOOVER ROAD - WARREN, MI
RE-VERBER-RAYINFRA-RED RADIANT TUBE HEATER
[phone] - www.drp-co.com
Volts AC:
AMPS - Starting:
AMPS - Running:
Combustion Chamber:
120V - 60Hz
4.8
1.1
4” Black Coated Aluminized
DESIGN COMPLIES WITH:
ANSI Z83.20b-2003-GAS FIRED LOW INTENSITY INFRA-RED HTR.
Manifold Pressure:
Maximum Inlet Pressure:
Minimum Inlet Pressure:
3.5 in.
14 in.
5.0 in.
W.C.P.
W.C.P.
W.C.P.
Serial No.: 0807XXXXXXXXXX 0001
MODEL NO.
LS-20-40N
Heater Type
Minimum Mounting Angle:
Maximum Mounting Angle:
C1
0
45
DEGREES
DEGREES
INPUT BTU/H
40,000
FOR USE WITH
Natural Gas
3
VALVE
PS
PRESSURE
SWITCH
V
1.0 Introduction • Safety Signs and Labels
F/ N : L LV3EP5
Green Crescent
(This label is on models with
optional24VAOonly).
Left Panel
(FanCompartment)
F/ N : L LV3EP6
SAMPLE
Top Panel
F/N: LLTCL006 - Clearance
to Combustibles Label.
F/N: LLLOGO
Burner Control Box Component Label
(locatedunderthetoppanel)
Bottom Panel
LS-20-40 N
Data on this label is for the model shown on this label. If your heater has been converted,
this information is not accurate. Please contact the factory for assistance.
BURNER COMPONENTS:
For parts replacement information, contact factory at 586-756-0950 or visit www.drp-co.com/parts.
Serial No.: 0804XXXXXXXXXX 0001
Gas Valve:
Circuit Board:
Wire Harness:
N.O. Switch:
N.O. VL Orifice:
N.C. Switch:
N.C. VL Orifice:
Diff Switch:
Diff VL Orifice:
Igniter:
Burner:
16” Tube:
Ind. Lights:
Diag. Light:
Term. Block:
Transformer:
Fan:
Alt. Fan:
Alt. Fan Usage:
Relay:
Filter:
24 Volt In:
120 Volt In:
Gas In:
Extra VL Orifice:
Production Code:
Version:
Stock:
Add-On:
Internal Use Only:
HEATER
TYPE: Electric:
Tag:
Special 1:
Special 2:
Gas:
Air:
C1
C1 C2 C3
None
N/A
LS-40
5.05
VR4205M-1324
Micro 60-24
3 PCS Harness
None
None
None
None
IS22016051F5169
Grey (+ / -)
Norton
High
4” Gen.
Yellow - 120V
(Specify TP-#’s)
240
351A
352A
N/A
N/A
264E
50
201B
1080
328
None
None
None
Fasco Lg.
50Hz - 120V
When Specified
None
None
None
120V Cord
7/8” FC Flare
None
N/A
N/A
55A
55B
N/A
N/A
832
333
83
3
1 1/2”
TP-204#
TP-44#
3
1 5/8”
LLWT038
None
1
1 5/8”
17
1 7/16”
Orifice Type:
Back Panel
Rating Plate
F/N:LLTB018(NG)
F/N: LLTB019(LPG)
Air Metering Orifice
DO NOT REMOVE
TP-114
TP-3014 1 - 1/2"
F/N: LLAC
Air Metering Orifice
SAMPLE
®
DETROIT RADIANT PRODUCTS COMPANY
21400 HOOVER ROAD - WARREN, MI
RE-VERBER-RAY INFRA-RED RADIANT TUBE HEATER
FOR INDOOR INSTALLATION ONLY.
Class IIIA Permanent Label
[phone] - www.drp-co.com
Volts AC:
AMPS - Starting:
AMPS - Running:
Combustion Chamber:
120V - 60Hz
4.8
1.1
4” Black Coated Aluminized
DESIGN COMPLIES WITH:
ANSI Z83.20b-2003-GAS FIRED LOW INTENSITY INFRA-RED HTR.
Manifold Pressure:
Maximum Inlet Pressure:
Minimum Inlet Pressure:
3.5 in.
14 in.
5.0 in.
W.C.P.
W.C.P.
W.C.P.
Serial No.: 0807XXXXXXXXXX 0001
MODEL NO.
LD-20-40N
Heater Type
Minimum Mounting Angle:
Maximum Mounting Angle:
C1
0
45
DEGREES
DEGREES
INPUT BTU/H
40,000
FOR USE WITH
Natural Gas
SAMPLE
LS
NEUTRAL
EARTH
HOT
- 120V HEATER INPUT -
120V
F/ N : L LV3EP1
SAMPLE

Children and adults should be alerted to the hazards of high surface temperatures and should stay away
to avoid burns or clothing ignition.
Young children should be carefully supervised when they are in the same space as the heater.
Clothing or other flammable materials should not be hung from the heater, or placed on or near the heater.
Any guard or other protective device removed for servicing the heater must be replaced prior to operating
the heater.
Installation and repair should be done by a qualified service person. The heater should be inspected
before use and at least annually by a qualified service person. More frequent cleaning may be required
asnecessary.Itisimperativethatthecontrolcompartment,airpassagewaysandburner(s)oftheheater
be kept clean.
6
LS Series
Warning Symbols
Safety is the most important consideration during installation, operation and maintenance of the tube
heater. You will see the following symbols and signal words when there is a hazard related to safety or
property damage.
CAUTION
!
2.0 Safety •Warning Symbols •Applications
2.0 Safety
Warning indicates a potentially hazardous situation
which, if not avoided, could result in death or injury.
Caution indicates a potentially hazardous situation
which, if not avoided, could result in minor or
moderate injury.
Notice indicates a potentially hazardous situation
which, if not avoided, could result in property
damage.
NOTICE
WARNING
!
CAUTION
!
WARNING
!
Improper installation, adjustment, alteration, service or maintenance can cause
property damage, serious injury or death. Read and understand, the installation,
operating and maintenance instructions thoroughly before installing or servicing this
equipment. Only trained, qualified gas installation and service personnel may install or
service this equipment.
Applications
This is not an explosion proof heater. No tube heater may be used in a Class 1 or Class 2 Explosive
environment. Consult your local Fire Marshall, insurance carrier and other authorities for approval if the
proposed installation is in question.

Public Garages:
This heater must be installed in accordance with the latest edition of the Standard for Parking
Structures,ANSI/NFPA88AortheCodeforMotorFuelDispensingFacilitiesandRepairGarages
ANSI/NFPA 30A. In Canada, refer to CAN/CGA B149.1 and B149.2.
 •Heatersmustnotbeinstalledlessthan8ft.(2.4m)abovetheoor.Minimumclearancesto 
combustibles must be maintained from vehicles parked below the heater.
 •Wheninstalledoverhoists,minimumclearancestocombustiblesmustbemaintainedfromthe 
upper most point of objects on the hoist.
Aircraft Hangars:
This heater must be installed in accordance with the latest edition of the Standard for Aircraft Hangars,
ANSI/NFPA 409. In Canada, refer to CAN/CGA B149.1 and B149.2.
 •Inaircraftstorageandservicingareas,heatersshallbeinstalledatleast10ft.fromabovetheupper 
surface of wings or of the engine enclosures of the highest aircraft that may be housed in the hangar.
The measurement shall be made from the wing or engine enclosure, whichever is higher from the
floor, to the bottom of the heater.
 •Inareasadjoiningtheaircraftstoragearea(e.g.,shops,ofces)thebottomofheatersshallbe 
  installednolessthan8ft.(2.4m)abovetheoor.
 •Suspendedorelevatedheatersshallbelocatedinspaceswheretheyshallnotbesubjecttodamage
by aircraft, cranes, movable scaffolding or other objects.
Provisions shall be made to assure accessibility to suspended tube heaters for recurrent maintenance
purposes.
Standards, Certifications and Government Regulations
Installation of this tube heater must conform with all applicable local, state and national specifications,
regulations and building codes. Contact the local building inspector and/or fire marshall for guidance.
In the absence of local codes, the installation must conform to the latest edition of:
United States:NationalFuelGasCode,ANSIZ223.1(NFPA54).
Canada: CAN/CGA B149.1 and .2, Canadian Electrical Code C22.1
7
LS Series
Not For Use in Indoor Living Spaces. Installing this unit in residential indoor living spaces or sleeping
quarters, such as bedrooms or basements, may result in property damage, serious injury or death.
2.0 Safety •Applications •Standards, Certifications and Regulations
WARNING
!
Commercial / Industrial Applications
Unless otherwise indicated, tube heaters are designed and certified for use in industrial and commercial
buildings, such as warehouses, manufacturing plants, aircraft hangars and vehicle maintenance shops.
For maximum safety the building must be evaluated for potential problems before installing the heating
system. A critical safety factor to consider before installation is the clearance to combustibles.
Residential Applications
Only select LS Series models are DesignCertiedunderCSA Requirements for residential radiant tube
heaters(No.7-89).Notforuseinresidentialindoorlivingareasorsleepingquarters.

WARNING
!
Placement of explosive objects, flammable objects, liquids and vapors
close to the heater may result in explosion, fire, property damage, serious
injuryordeath.Donotstoreoruseexplosiveobjects,liquidsandvaporin
the vicinity the heater.
8
LS Series
2.0 Safety • Clearance to Combustibles
Clearance to Combustibles
WARNING
!
Placement of explosive objects, flammable objects, liquids and vapors
close to the heater may result in explosion, fire, property damage, serious
injuryordeath.Donotstoreoruseexplosiveobjects,liquidsandvaporin
the vicinity the heater.
•Paint
•Parkedvehicles
•Gasoline
•Storageracks
Combustible items: Moving Objects:
•Wood •Overheaddoors
•Paper •Vehiclelifts
•Fabric •Cranes
•Chemicals •Hoists
When installing the tube heating system, the minimum clearances to combustibles for your Series tube
heater and system configuration must be maintained. These distances are shown in Chart 1.1 on page 9
and on the burner control box. If you are unsure of the potential hazards, consult your local fire marshall,
fire insurance carrier or other qualified authorities on the installation of gas fired tube heaters for approval
of the proposed installation.
In locations used for the storage of combustible materials, signs must be posted to specify the maximum
permissible stacking height to maintain the required clearances from the heater to the combustibles.
Signsmusteitherbepostedadjacenttotheheater’sthermostatorinaconspicuouslocation.
Thestatedclearancetocombustiblesrepresentsasurfacetemperatureof90ºF(32ºC)aboveroom
temperature. Building materials with a low heat tolerance (such as plastics, vinyl siding, canvas,
tri-ply,etc.)maybesubjecttodegradationatlowertemperatures.Itistheinstaller’sresponsibilityto
assure that adjacent materials are protected from degradation.
A critical safety factor to consider before installation is the clearances to combustibles. Clearance to
combustibles
is defined as the minimum distance you must have between the tube surface, or reflector,
and the combustible item
. Considerations must also be made for moving objects around the tube heater.
The following is a partial list of items to maintain clearances from:
•Vehicleparkingareas
•Vehicleswithliftsorcranes
•Storageareaswithstackedmaterials
•Lights
•Sprinklerheads
•Overheaddoorsandtracks
•Dirty,contaminatedenvironment
•Gasandelectricallines
•Combustibleandexplosivematerials
•Chemicalstorageareas
•Areasofhighchemicalfumeconcentrations
•Provisionsforaccessibilitytotheheater
•Adequateclearancesaroundairopenings
•Combustionandventilatingairsupply
Hazards:
For maximum safety the building must be evaluated for hazards before installing the heating system.
Examples include, but are not limited to:

Model Number
Mounting
Angle*
Sides
Front Behind Top Below
25,000 & 30,000 BTU/H MODELS
LS (10) - 25, 30 [N, P] 0° 88436
45° 39 810 36
with 1 side shield 0° 29 8 4 36
with 2 side shields 0° 99436
20 ft. from burner 0° N/A N/A N/A N/A
40,000 BTU/H MODELS
LS (10, 15, 20) - 40 [N, P] 0° 15 15 645
45° 58 810 45
with 1 side shield 0° 42 8 6 45
with 2 side shields 0° 20 20 645
20 ft. from burner 0° N/A N/A N/A N/A
50,000 BTU/H MODELS
LS (15) - 50 [N, P] 0° 11 11 648
45° 39 810 48
with 1 side shield 0° 29 8 6 48
with 2 side shields 0° 16 16 648
20 ft. from burner 0° N/A N/A N/A N/A
50,000 BTU/H MODELS
LS (20, 30) - 50 [N, P] 0° 11 11 648
45° 39 810 48
with 1 side shield 0° 29 8 6 48
with 2 side shields 0° 16 16 648
20 ft. from burner 0° 77630
Chart 1.1 • Clearance to Combustibles in Inches (seeFigure1.1forMountingAngles)
*
Heaters mounted on an angle between 0° to 45° must maintain clearances posted for 0° or 45°; whichever is greater.
The minimum end clearance is 12 in.
Figure 1.1 •Mounting Angles
0° Mounting Angle 45° Mounting Angle
0° Mounting Angle
with 1 Side Shield
(P/N:SSE)
0° Mounting Angle
with 2 Side Shields
(P/N:SSE)
Side Side
Below
Top
Front Behind
Below
Top
Front Behind
Below
Top
Side Side
Below
Top
WARNING
!
Failure to comply with the stated clearances to combustibles may result in
in personal injury, property damage and/or death.
9
LS Series 2.0 Safety • Clearance to Combustibles

10
LS Series
WARNING
!
Improper installation, adjustment, alteration, service or maintenance can cause
property damage, serious injury or death.
Read and understand, the installation, operating and maintenance instructions
thoroughly before installing or servicing this equipment.
Only trained, qualified gas installation and service personnel may install or service
this equipment.
Design Considerations and Prechecks
Placement of infrared heaters is influenced by many factors. Aside from safety factors, considerations
such as the number of heater or vent elbows that are allowed, maximum vent lengths, ducting of
combustion air and combining exhaust vents are a few examples. All installation manuals, along with
national, state, provincial and local codes, address these issues. It is critical that you read, understand
and follow all guidelines and instructions.
To ensure a properly designed heating system, a layout should be developed for the correct placement of
the burner control box, tubes, vents and combustion air intake ducts. Inspect and evaluate the mounting
conditions, vent locations, gas supply and wiring.
When designing an infrared radiant heating system, consider the following:
 • Hasthebuilding’sheatlossbeenevaluated?
 • Doesthedesignmeettheneedsofthespace?
 • Haverecommendedmountingheightsbeenobserved?
 • Haveallclearancetocombustiblesituationsbeenobserved?
 • Isthesupply(burner)endoftheheaterlocatedwheremoreheatisrequired?
 • Isitbesttooffsettheheatersand/orrotatethereectorstowardstheheatzone?
 • Areextraguards,sideshields,‘U’or‘L’reectorcoversrequired?
 • Doestheheaterrequireoutsidefreshairforcombustion?
 • Istheenvironmentharshorcontaminated(requiringoutsideairforcombustion)?
 • Arechemicalsorvaporsaconcern(requiringoutsideairforcombustionoradditionalventilation)?
IMPORTANT: Fire sprinkler heads must be located at an appropriate distance from the heater. This
distance may exceed the published clearance to combustibles as posted on the heater. Certain
applications may require the use of high temperature sprinkler heads or relocation of the heaters.
Sprinkler systems containing propylene glycol or other flammable substances are not to be used in
conjunction with this heater without careful consideration for and avoidance of potential fire or explosion
hazards. For further information consult NFPA 13.
The effective infrared surface temperature of a person or object may be diminished with wind above 5
mph.Theuseofadequatewindbarrier(s)mayberequired.
3.0 Installation
3.0 Installation • DesignConsiderationsandPrechecks

11
LS Series
Factory recommended mounting heights are listed as a guideline. If infrared heaters are mounted to low
ortohigh,theymayresultindiscomfortorlackofheat.DetroitRadiantProductsCompanygenerally
recommends observing the recommended mounting heights to optimize comfort conditions. However,
certain applications such as spot heating, freeze protection, outdoor patio heating or very high ceilings
may result in the heaters being mounted outside of the factory recommended mounting heights.
*Optionalprotectiveguard(P/N:PG)isrequiredwhenmountingbelow8-ft.
Dimension C
Maximum
distance
between
heater
and wall
Chart 3.1 • Recommended Mounting Heights and Coverages
Note: This chart is provided as a guideline. Actual conditions may dictate variation from this data.
Model
BTU/H Output
Coverage Area Straight Config. (LxW)
Coverage Area U-Tube Congfig. (LxW)
Recommended Mounting Height (ft.)*
Distance Between Heaters (ft.) Dimension A Distance Between Heater Rows (ft.) Dimension B
Maximum Distance Between Heaters and Wall (ft.) Dimension C
Figure 3.3 • Mounting Height Dimensions • see chart 3.1 for dimensions
Dimension A
Dimension B
Distancebetween
heater rows
Dimension C
Maximum distance between heater and wall
Dimension A
Note:DimensionsA,B&Carebaseduponheatershungatthefactoryrecommendedmountingheight.
10 ft. 25,000 8’-11’ 20’x12’ N/A 10’-20’ 20’-40’ 16’
30,000 8’-11’ 20’x12’ N/A 10’-20’ 20’-40’ 16’
40,000 10’-14’ 20’x12’ N/A 10’-20’ 20’-40’ 16’
15 ft. 40,000 8’-13’ 20’x12’ N/A 10’-20’ 20’-40’ 16’
50,000 10’-15’ 22’x15’ N/A 20’-30’ 30’-50’ 18’
20 ft. 40,000 8’-13’ 20’x13’ 12’x12’ 10’-20’ 20’-40’ 16’
50,000 9’-15’ 22’x15’ 12’x12’ 20’-30’ 30’-50’ 18’
30 ft. 50,000 9’-14’ 32’x15’ 15’x15’ 20’-30’ 30’-50’ 18’
3.0 Installation • Recommended Mounting Heights

WARNING
!
12
LS Series
Hanger Placement and Suspension
Improper suspension of the tube heater may result in collapse and being crushed. Always
suspend from a permanent part of the building structure that can evenly support the total
force and weight of the heater.
Failure to maintain minimum clearance to combustibles may result in fire and/or explosion,
property damage, serious injury or death. Always maintain minimum clearances and post
clearance safety limit signs or the clearance safety tag where needed.
3.0 Installation • Hanger Placement and Suspension
Suspension of the heater must conform to applicable codes referenced in the Safety section and
these instructions.
1Lay all radiant tubing out in the following order. Position tubes in approximate location (see Figures 3.4
and3.14).
 •10ft.4”to3”O.D.titaniumtreatedcombustionchamber(TP-1088).
 •3”O.D.aluminizedradiantemittertube(s)ifapplicable.
2Connectthefemaleendofthetitaniumcombustionchamber(TP-1088)tothe16”burnertubeby
usingthe4”stainlesssteeltubeclamp(TP-220).
Important! The10ft.4”to3”O.D.tianiumalloytreatedcombustionchambermustbeplacedas
the first tube downstream of the burner control box. The combustion chamber has an orange
identification sticker located on the swaged end of the tube.
3Placea4”tubehanger(TP-19B)onthetaperedtitaniumcombustionchamber’s4”O.D.end.The
spacingbetweentheburnercontrolboxmountingbracketsandthe4”tubehangershouldbe2’-4”.
4Mark locations for hanging points.
NOTE: If the available hanging points do not allow for the recommended spacing then additional
hangers(P/N:TP-1079)maybenecessary.
 •Thespacingbetweentheburnercontrolboxmountingbracketsandthersthangershouldbe
  approximately2’-4”.
 • Thespacebetweenthersttwohangersplacedonthersttube,shouldbeapproximately8’-10”.
 • Thespacebetweenhangersthereafter,onepertube,shouldbeapproximately9’-8”.

13
LS Series
Chart 3.2 • Heater Mounting Requirements and Weights
*Refer to page 18 for U-bend configuration dimensions.
Model Dimension* Straight Configuration Suspension Points Control Box Stabilizer Shipping Weight Chain Set Qty. Straight Chain Set Qty. w/TF1B Optional Brass Knuckle(P/N:BK) Optional Single Mount Bracket
10 ft. 12’-1”/145” 2 2 70 lbs. 4521
15 ft. 16’-10”/202” 2 2 85 lbs. 563N/A
20 ft. 21’-10”/262” 3 2 100 lbs. 5632
30 ft. 31’-7”/379” 4 2 120 lbs. 674N/A
3.0 Installation • Hanger Placement and Suspension
2’4”
16”Burner
Tube 10ft.4”to3”O.D.TaperedTitanium
Treated Combustion Chamber
(TP-1088)
3”O.D.Aluminized
Steel Radiant Emitter
Tube(s)(ifapplicable)
8’10” 9’8” 9’8”
Burner
Control Box
Burner Control Box
Suspension Points
Suspension
Point
Igniter/
Sensor Box
3”TubeClamp
(TP-1079)
4”StainlessSteel
TubeClamp(TP-220)
4”TubeHanger(TP-19B)
3”TubeHanger(TP-19B)
Suspension
Point
Suspension
Point
Figure 3.4 •Heater Mounting Layout
NOTE: A sticker identifying the
titanium treated combustion
chamber(s)islocatedontheswaged
endofthetube(s).

14
LS Series
5S-Hook and
#1Double-LoopChain
3Preparemountingsurface,ifnecessaryweldblocks,drillholes(seegure3.5).
NOTE: The burner control box and radiant tubes should be in straight alignment and level.
4Fasten beam clamp, screw hook or other type of suspension anchor to hanging point.
5AttachandcloseS-hook(P/N:S-HOOK)and#1double-loopchain(P/N:THCS)toanchor.Check
that it is securely attached. NOTE: Threaded rod and turnbuckles may be used.
6Attach hangers to chains. Adjust chain lengths until radiant tubing is level and equal weight distribution
isachieved.Chainsmustbestraightupanddown.Donotinstallchainsatanangleasthiscanresult
in tube warpage or separation.
Figure 3.5 •Mounting the Hangers
3Wood Beam
3Concrete Beam
4Beam Clamp
4Screw Hook
4
Screw hook
with Locknut
and Washer
5Threaded Rod
and Turnbuckle
6Threaded Rod
6Chain
3
I-Beam
4Beam Clamp
6Chain 6Chain
3I-Beam
3.0 Installation •Hanger Placement and Suspension

15
LS Series
Figure 3.6 •U-Tube Hanger Mounting Options
3.0 Installation •Hanger Placement and Suspension
For 45 degree hanging angle use two
S-hooks and two #1 double-loop chains.
For variety of hanging angles, use an optional
BrassKnuckle(P/N:BK)ttingwitha#1double-
loop chain and S-hook.
45°
30° 15°
U-Tubes can be mounted at a 15, 30 or 45 degree
angle with two suspension points, using two optional
BrassKnuckle(P/N:BK)ttings,#1double-loop
chains and S-hooks.
U-Tubes can be mounted from a single suspension
point using an optional Single Mounting Bracket
(P/N:SMB)withveS-hooksand#1double-loop
chains.
Figure 3.7 •Angled Hanger Mounting Options
Exhaust
End
Single Mounting
Bracket
Brass Knuckle

16
LS Series
Radiant Tube Assembly
To install the radiant tubes:
1Place tubes in hangers with the welded seam facing downward and the swaged end of the tube
towardstheexhaustendoftheheatersystem(seeFigure3.8).
Refer to page 23 for tube installation sequence.
2 Slidetubeclampsontoradianttubes(seegure3.9).
Figure 3.8 •Attach Hangers
Figure 3.9 •Attach Tube Clamps
Hanger
Welded seam
faces down
Swaged End
Tube Clamp
Radiant Tube
NOTE: If the tube clamp comes apart, the spacer must be
re-assembledwiththespacer’sconcavesurfacefacingagainst
the radiant tube surface.
Concave surface
3.0 Installation •Radiant Tube Assembly

17
LS Series
Optional Elbow or U-Bend Accessory Configuration
A 90 degree elbow or 180 degree U-bend accessory fitting may be installed in the radiant tube heating
system. Refer to Chart 3.3 for minimum distance requirements from the burner control box.
When installing an Elbow or U-Bend Accessory Fitting:
• Thetopclearanceofanuncovered(noreector)elboworU-bendaccessoryttingtocombustibles
is 18 in.
• Ifoperatingtheheaterun-vented,separatetheintakeairtotheheaterfromitsexhaustproductsa
minimum of 4 ft., further separation may be necessary. Combustion air may also be supplied.
• Amaximumoftwo90°elbowsorone180°U-bendcanbeinstalledonaheater.
3Slip-fit the radiant tube sections together until tightly connected (install the swaged end of each tube
towardsexhaustend).NOTE: If it is difficult to mate the tubes, they may be installed incorrectly.
4Center tube clamps over the seam where two radiant tube sections connect. If necessary, rotate tube
clamps so they will not interfere with the reflector end caps during expansion and contraction of
the heater.
5 Tightentubeclampboltstosecure.Whenpropercompressionisobtained(40-60ft-lbs.torque)the
tube seam will create a visible mark on the tube clamp. NOTE: Excessive torque may damage the
tube clamp.
6 Determinethelocationoftheburnercontrolboxandnotetheplacementofthemountingchains.
Figure 3.10 •Tube Connections
Tubes fit snuggly together and the
tube clamp is centered over the seam.
Tubes are not fit snuggly
together and the tube clamp is
not centered over the seam.
The tube clamp is tight when the
torque is achieved (normally
whenseambecomesvisible).
Correct Tube Connection Incorrect Tube Connection
90Degree3”Elbow 180Degree
3”U-Bend
Figure 3.11 •Optional Tube Connections
(P/N:DB-TF1B)
(P/N:DB-E6)
3.0 Installation •Tubes: Optional Elbow or U-Bend Accessory Configuration

*TheDB-5EA-SUBadd-onmayonlybeorderedatthetimeof
 heaterproduction.Fieldcorrectionsrequiretwo(2)DB-TR-60
packages.
18
LS Series
Figure 3.12 •Elbow and U-Bend Clearances
Chart 3.3
Minimum Distance From Burner
Control Box to Elbow or U-bend
Accessory Fitting
DimensionA
U-Bend can be set in both directions
12”
Figure 3.13 •U-Bend and Elbow Dimensions
Chart 3.4
Overall Dimensions for Heaters Configured
With U-Bend (P/N: DB-TF1B)
Elbow can be set
in both directions
Tube Clamp Tube Clamp
DimensionA
DimensionB
P/N:DB-TF1B(3”)
P/N:DB-E6(3”)
8”
Tube Length DimensionB Notes
10 ft. N/A N/A
15 ft. N/A N/A
20 ft. 13’-0”/156” N/A
30 ft. 17’-8”/212” RequiresP/N:DB-5EA-SUB*
Model BTU Range DimensionA
25,000 N/A
30,000 N/A
40,000 10 ft.
50,000 10 ft.
3.0 Installation •Optional Elbow or U-Bend Accessory Configuration
11.5”
11.5”
15”
16”
6”
18”
10”
20”
Tube Clamp Tube Clamp

19
LS Series 3.0 Installation •Burner Control Box Suspension
Burner Control Box Suspension
Suspending the burner control box must be done in accordance with applicable codes listed in the Safety
section and these instructions.
The burner control box must be in straight alignment with radiant tubes and level. Contact your local
distributor or the factory to see if your application allows for the rotation of the burner control box.
1 Determinethemountingchainlocationsforhangingtheburnercontrolbox.
2Fasten beam clamp, screw hook or other type of suspension anchor to hanging point.
3 AttachS-hookand#1doubleloopchain(P/N:THCS)toanchor.Checkthatitissecurelyconnected.
4
Attach chain assemblies and S-hooks to mounting brackets on the burner control box. Adjust chain lengths
until level and in straight alignment with radiant tubes. Burner sight glass will be visible from the floor.
Figure 3.14 •Burner Control Box Assembly •Side View
Figure 3.15 •Burner Control Box showing U-Shaped Configuration •End View
Burner Sight Glass
(bottomsideofthetube)
16 in. burner tube is in straight
alignment with combustion chamber
8.5”
16”
12”
TP-1088
4”to3”O.D.
Tapered Tube
TP- 1077
3”TubeClamp
TP-10793”Hanger
TP-19B
4”Hanger
TP- 220
4”StainlessSteel
Tube Clamp
TP-1082
3”O.D.
Tube
Place welded seam down
12
3
29.6”
16”
5.5” 5”
18”
3.5” 3”
8.1”

20
LS Series
Figure 3.16 •Reflector Assembly
Reflector Assembly
Reflector
4”Overlap
Reflector Center
Support
Radiant
Tube
Hanger and
Chain
Place at the
mid-point
of the tube
Reflector
End Cap
Reflector
Tension
Spring
Clips
To install the reflectors (seeFigure3.16):
1Attach the reflector center supports onto radiant tubes.
2 Slideeachreectorsectionthroughthehangersandadjustthereectortensionspring(ifapplicable)
into the V-groove on the top of the reflector. The reflectors should overlap approximately 4 inches.
3To prevent the reflectors from shifting, secure the reflector sections together using sheet metal screws,
exceptattheexpansionjoint(seep.23).NOTE: Installer to supply sheet metal screws.
4Attach reflector end caps with polished finish inward to each end of the reflector run. Secure with clips.
Reflectors and reflector accessories direct infrared energy to the floor level. The reflector assembly
depends on the heater configuration, proximity to combustibles, and space surrounding the heater.
Beforeyoubeginassembly,determineiftheuseofreectoraccessoriesarenecessary(seeChart3.5).
3.0 Installation •Reflector Assembly