BRANT RADIANT LS3 User Manual

!

LS3 Series

Installation Manual

The LS3 Series Infrared Tube Heater is a positive pressure, single-stage radiant heater system. This
manual provides specific information related to the LS3 Series model. All persons involved with the
installation, operation and maintenance of the heater system must read and understand the information
in this 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.

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 fire department.

INSTALLER: Present this manual to the end user.

Keep these instructions in a clean and dry place for future reference.

Model#: ___________________ Serial #: _________________________

(located on rating label)

LIOLS3-Rev. 32513

Print: 1M-3/14_r2-7/14 (CDS)

1.0 Introduction • Table of Contents

LS3 Series

Contents

1.0 Introduction ......................................................................3

Heater Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Specifications....................................................................... 3

Safety Signs and Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.0 Safety ...........................................................................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 and Coverages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .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

Final Heater Assembly............................................................... 22

Venting........................................................................... 23

Combustion Air Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

Separated Combustion Systems....................................................... 31

Combustion Air Supply - Room Air ..................................................... 32

Optional Unvented Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Gas Supply Installation Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Electrical Requirements and Wiring Diagrams ............................................39

Typical Field Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Thermostat Connection.............................................................. 40

Unit Start-up (Commissioning) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

High Altitude Operation .............................................................. 46

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Warning Symbols.................................................................... 6

4.0 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

Diagnostics ....................................................................... 48

Operating Instructions ............................................................... 47

5.0 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Heater Components and Parts List..................................................... 54

Routine Inspection.................................................................. 56

Limited Warranty ................................................................... 58

Kit Contents ....................................................................... 60

Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

2

LS3 Series

1.0 Introduction • Overview • Heater Components • Specifications

1.0 Introduction

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. This manual is property of the owner, and must stay
with the owner or unit after the installation is complete.

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 contents included with your tube
heater. Reference page 60 for a list of the kit contents for your model 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.

Specifications

Chart 1.1 • LS3 Series Specifications

Model

Number

LS3-10-25

LS 3-10 -30

LS3-15-25

LS 3-15-30

LS3-15-40

LS3-15-50

LS3-20-40

LS3-20-50

Gas Type

(Select one)

Maximum Input

(BTU/h)

N or LP 25,000 12’-1” N/A 70 lbs. 8’ to 11’ Titan N/A Yes

N or LP 30,000 12’-1” N/A 70 lbs. 8’ to 11’ Titan N/A Yes

N or LP 25,000 16’-10 ” N/A 85 lbs. 8’ to 13’ Titan Alum Yes

N or LP 30,000 16’-10 ” N/A 85 lbs. 8’ to 13’ Titan Alum Yes

N or LP 40,000 16’-10 ” N/A 85 lbs. 8’ to 13’ Titan Alum Yes

N or LP 50,000 16’-10 ” N/A 85 lbs. 10’ to 15’ Titan Alum No

N or LP 40,000 21’-10 ” 13’-0” 100 lbs. 8’ to 13’ Titan Alum Yes

N or LP 50,000 21’-10 ” 13’-0” 100 lbs. 9’ to 15’ Titan Alum No

Straight Length

U-Tube Length

Standard

Weight (lbs.)

Recommended

Mounting Height**

Combustion

Chamber (Black Coated)

Radiant Emitter

Tube (s) (Black

Coated)

Residential

Certification^

LS3-30-50*

* Model requires LV3-5EA-SUB optional accessory package when installing in a ‘U’ configuration (P/N: DB-TF1B/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.

N or LP 50,000 31’-7 ” 17’- 8 ” 120 lbs. 9’ to 14’ Titan Alum Yes

3

!

1.0 Introduction • Safety Signs and Labels

- 120V HEATER INPUT -

LS3 Series

WARNING

Read and understand all safety information and warnings in this manual before
installation, operation and maintenance of the radiant tube heater system.

Safety Signs and Labels

Product safety signs or labels should be replaced by the product user when they no longer are legible.
Contact either your local distributor or the product manufacturer for obtaining replacement signs or labels.

HOT

120V

F/N : LLV3EP1

NEUTRAL

EARTH

F/N: LLAC023

Combustion Air

Connector Label

HOT

NEUTRAL

120V

EARTH

- 120V HEATER INPUT -

3

FAN COMPARTMENT

1. Disconnect gas & electricity.

2. Remove top cover (2 thumbscrews).

3. Remove tsix (6) 1/4” screws.

4. Lift and remove panel.

KEEP COVER IN PLACE. REMOVE FOR SERVICE ONLY.

SERVICE ACCESS PANEL

Top Panel

F/N : LLV3EP 6

SERVICE ACCESS PANEL

KEEP COVER IN PLACE. REMOVE FOR SERVICE ONLY.

4. Swing hinged panel downward.

3. Remove top cover.

2. Remove four (4) thumbscrews.

1. Disconnect gas & electricity.

CONTROLS & GAS VALVE COMPARTMENT

Bottom Panel

Back Panel

F/N: LLTB018 (NG)

F/N: LLTB 0 19 (LP)

F/N: LLTCL006L/C/R

Clearance to Combustibles Label

F/N: LLLOGO1 Logo Label

4

LS3 Series

SERVICE ACCESS PANEL

IGNITER & FLAME SENSE COMPARTMENT

1. Disconnect gas & electricity.

2. Remove cover by lifting top

cover upward and outward.

CAUTION: HOT SURFACE.

KEEP COVER IN PLACE. REMOVE FOR SERVICE ONLY.

DETROIT RADIANT PRODUCTS COMPANY
21400 HOOVER ROAD - WARREN, MI 48089
[phone] www.reverberray.com

LOW-INTENSITY INFRARED HEATER

MAX. HEAT INPUT

MAX. DEBIT CALORIFIQUE

MIN. HEAT INPUT

MIN. DEBIT CALORIFIQUE

VENT CATEGORY

ÉVENT CATÉGORIE

BTU/h

BTU/h

VOLTAGE

AMPS

PHASE

FREQUENCY

Hz

VAC

MANIFOLD PRESSURE

PRESSION A LA TUBULURE D'ALIMENTATION

MAXIMUM INLET PRESSURE

PRESSION D'ALIMENTATION MAXIMALE

MINIMUM INLET PRESSURE FOR PURPOSE OF ADJ.

PRESSION D'ALIMENTATION EN GAS MIN. ADMISE

INCHES W.C.

INCHES W.C.

INCHES W.C.

RADIATEUR À INFRAROUGE À FAIBLE INTENSITÉ

ORIFICE SIZE

DIM DE L'INJECTEUR

NATURAL GAS PROPANE GAS

THIS DESIGN COMPLIES WITH STANDARD(S):

COMPLES DE CETTE CONCEPTION AVEC LA NORME:

HEATER BUILD TYPE

TYPE OF GAS

TYPE DE GAZ

MIN. MOUNTING ANGLE

MIN. ANGLE DE SUPPORT

MAX. MOUNTING ANGLE

MAX. ANGLE DE SUPPORT

MODEL NUMBER

NUMÉRO DE MODÈLE

SERIAL NUMBER

NUMÉRO DE SÉRIE

VERSION

COMBUSTION CHAMBER

®

FOR COMMERCIAL / INDUSTRIAL USE.

FOR INDOOR USE ONLY.

MADE IN U.S.A.

40,000

40,000

CATEGORY III

2.4

SINGLE

60

1203.5

14.0

5.0

49

D.M.S.

57

D.M.S.

ANSI Z83.20b-2011 • CSA2.34B-2011 RADIANT TUBE HEATER

C1

NATURAL

AGA 7-89 RESIDENTIAL RADIANT TUBE HEATER

0°
45°

LS3-20-40N

YYMMREPCSHIPPE#### 09/12

TP-26B; INCH BC ALUMINIZED

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.

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.

F/N: LLTB026

SERVICE ACCESS PANEL

Controls Compartment

F/N: LLTB025R

SERVICE ACCESS PANEL

F/N: LLTB024L

1.0 Introduction • Safety Signs and Labels

LOW-INTENSITY INFRARED HEATER

®

RADIATEUR À INFRAROUGE À FAIBLE INTENSITÉ

MODEL NUMBER

NUMÉRO DE MODÈLE

LS3-20-40N

MAX. HEAT INPUT

MAX. DEBIT CALORIFIQUE

MIN. HEAT INPUT

MIN. DEBIT CALORIFIQUE

TYPE OF GAS

TYPE DE GAZ

VENT CATEGORY

ÉVENT CATÉGORIE

COMBUSTION CHAMBER

THIS DESIGN COMPLIES WITH STANDARD(S):

COMPLES DE CETTE CONCEPTION AVEC LA NORME:

ANSI Z83.20b-2011 • CSA2.34B-2011 RADIANT TUBE HEATER
AGA 7-89 RESIDENTIAL RADIANT TUBE HEATER

DETROIT RADIANT PRODUCTS COMPANY
21400 HOOVER ROAD - WARREN, MI 48089
[phone] www.reverberray.com

SERIAL NUMBER

NUMÉRO DE SÉRIE

YYMMREPCSHIPPE#### 09/12

MANIFOLD PRESSURE

PRESSION A LA TUBULURE D'ALIMENTATION

BTU/h

40,000

MAXIMUM INLET PRESSURE

PRESSION D'ALIMENTATION MAXIMALE

BTU/h

40,000

MINIMUM INLET PRESSURE FOR PURPOSE OF ADJ.

PRESSION D'ALIMENTATION EN GAS MIN. ADMISE

NATURAL

ORIFICE SIZE

CATEGORY III

DIM DE L'INJECTEUR

TP-26B; INCH BC ALUMINIZED

SAMPLE

INCHES W.C.

14.0

INCHES W.C.

INCHES W.C.

5.0

NATURAL GAS PROPANE GAS

D.M.S.

57

49

FOR COMMERCIAL / INDUSTRIAL USE.

FOR INDOOR USE ONLY.

D.M.S.

MIN. MOUNTING ANGLE

MIN. ANGLE DE SUPPORT

MAX. MOUNTING ANGLE

MAX. ANGLE DE SUPPORT

HEATER BUILD TYPE

MADE IN U.S.A.

VOLTAGE

AMPS

PHASE

FREQUENCY

VERSION

1203.5

SINGLE

60

VAC

2.4

Hz

0°
45°
C1

Rating Plate

Bill of Material

LS3-20-40N

LS3-40

Production Code:

11.13

Version:

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:

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:

HEATER

For parts replacement information, contact factory at 586-756-0950 or visit www.drp-co.com/parts.

(Specify TP-#’s)

VR4205M-1324
Micro 60-24
3 PCS Harness
None
None
None
None
IS22016051F5169
Grey (+ / -)
Norton
High

SAMPLE

4” Gen.
Yellow - 120V

Orifice Type:

TYPE:

Gas:

TP-204#

Air:

TP-44#31 5/8”

C1

840A
851
852
N/A

N/A

264E

50
201B
1080
828

C1 C2 C3

3

1 1/2”

Serial No.: 1311XXXXXXXXXX 0001

None

Stock:

Add-On:

N/A

None

Diag. Light:

None

Term. Block:

None

Transformer:

Fasco Lg.

Fan:

50Hz - 120V

Alt. Fan:

When Specified

Alt. Fan Usage:

None

Relay:

None

Filter:

None

24 Volt In:

120V Cord

120 Volt In:

7/8” FC Flare

Gas In:

None

Extra VL Orifice:

Internal Use Only:

Electric:

1

LLWT038

Tag:

1 5/8”

None

Special 1:
Special 2:

N/A
N/A
55A
55B

N/A
N/A
334
333
83

17
1 7/16”

Burner Control Box

Component Label

(located inside the center

compartment lid)

Fan
Compartment

F/N: LL01 - Clearance Safety Tag

(Affix adjacent to heater’s thermostat)

F/N: LLTB004

(all heaters with 409 stainless steel tubes)

16” Burner Tube

Al-Ti Combustion
Chamber

Aluminized
Radiant Tube(s)

(if applicable)

F/N: LLTCL015
Lighting Instructions

5

2.0 Safety • Warning Symbols • Applications

!

!

!

LS3 Series

2.0 Safety

Read and understand all safety information and warnings in this manual prior to installation, operation,
and maintenance of this heater. Warnings indicate a potentially hazardous situation which, if not avoided,
could result in injury or death.

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause
property damage, serious injury or death. Read and understand, the installation,
operation and maintenance instructions thoroughly before installing or servicing this
equipment. Only trained, qualified gas installation and service personnel may install or
service this equipment.

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.

Warning indicates a potentially hazardous situation

WARNING

CAUTION

NOTICE

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.

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 marshal, insurance carrier and other authorities for approval if the
proposed installation is in question.

6

LS3 Series

!

2.0 Safety • Applications • Standards, Certifications and Regulations

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 LS3 Series models are Design Certified under CSA Requirements for residential radiant tube
heaters (No. 7-89). Not for use in the residential indoor living areas or sleeping quarters.

WARNING

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.

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 marshal 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

Copies of the Standards can be viewed or purchased at www.nfpa.org or www.scc.ca.

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 floor. 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, offices) the bottom of heaters shall be
installed no less than 8 ft. (2.4 m) above the floor.

• 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.

7

!

2.0 Safety • Clearance to Combustibles

!

LS3 Series

Clearance to Combustibles

A critical safety factor to consider before installation is the clearances to combustibles. Clearance to
combustibles

and the combustible item

The following is a partial list of items to maintain clearances from:

Combustible items: Moving Objects:

• Wood • Overhead doors

• Paper • Vehicle lifts

• Fabric • Cranes

• Chemicals • Hoists

Hazards:

For maximum safety the building must be evaluated for hazards before installing the heating system.
Examples include, but are not limited to:

is defined as the minimum distance you must have between the tube surface, or reflector,

. Considerations must also be made for moving objects around the tube heater.

• Paint

• Parked vehicles

• Gasoline

• Storage racks

• 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

• Vehicle parking areas

• Vehicles with lifts or cranes

• Storage areas with stacked materials

• Lights

• Sprinkler heads

• Overhead doors and tracks

• Dirty, contaminated environment

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 of the heater.

CAUTION

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.

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 2.1 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.

8

!

LS3 Series

2.0 Safety • Clearance to Combustibles

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 90°F (32°C) 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.

WARNING

Failure to comply with the stated clearances to combustibles may result in
personal injury, property damage and/or death.

Chart 2.1 • Clearance to Combustibles in Inches (see Figure 2.1 for Mounting Angles)

Model Number

(Length) - MBH

LS3 (10, 15) - 25 [N, P]
LS3 (10, 15) - 30 [N, P]

with 1 side shield 0° 29 8 4 36
with 2 side shields 0° 9 9 4 36

LS3 (15, 20) - 40 [N, P]

with 1 side shield 0° 42 8 6 45
with 2 side shields 0° 20 20 6 45

LS3 (15, 20, 30) - 50 [N, P]

with 1 side shield 0° 29 8 6 48
with 2 side shields 0° 16 16 6 48
20 ft. from burner 0° 7 7 6 30

Heaters mounted on an angle between 0° to 45° must maintain clearances posted for 0° or 45°; whichever is

*
greater.

NOTE: Use high BTU output when determining clearances. The minimum end clearance is 12 in.

Mounting

Angle*

25,000 & 30,000 BTU/h MODELS

0° 8 8 4 36

45° 39 8 10 36

40,000 BTU/h MODELS

0° 15 15 6 45

45° 58 8 10 45

50,000 BTU/h MODELS

0° 11 11 6 48

45° 39 8 10 48

Front Behind Top Below

Sides

Figure 2.1 • Mounting Angles

0° Mounting Angle

with 2 Side Shields

(P/N: SSE)

Top

0° Mounting Angle 45° Mounting Angle

Top

Top

0° Mounting Angle

with 1 Side Shield

(P/N: SSE)

Top

Side

Below

Side

Front

Below

Behind

Front

Below

Behind

Side Side

Below

9

!

3.0 Installation • Design Considerations and Prechecks

LS3 Series

3.0 Installation

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause property
damage, serious injury or death.

Read and understand, the installation, operation 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 reflectors towards the heat zone?

• Are extra guards, side shields, ‘U’ or ‘L’ reflector 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 velocities
above 5 mph. The use of adequate wind barrier(s) may be required.

10

LS3 Series

3.0 Installation • Recommended Mounting Heights

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

Maximum Input

(BTU/h)

Recommended

Mounting Height

(ft.)*

Coverage Area

Straight Config.

(LxW)

Coverage Area

U-Tube Config.

(LxW)

Distance Between

Heaters (ft.)

Dimension A

Distance Between

Heater Rows (ft.)

Dimension B

Maximum Distance

Between Heaters

and Wall (ft.)

10 f t. 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’

15 f t. 25,000 8’ - 13’ 20’ x 12’ N/A 10’ - 20’ 20’ - 40’ 16’

30,000 8’ - 13’ 20’ x 12’ N/A 10’ - 20’ 20’ - 40’ 16’

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’

* Optional protective guard (P/N: PG) is required when mounting below 8-ft.

Factory recommended mounting heights are listed as a guideline. If infrared heaters are mounted too low
or too 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.

Figure 3.1 • Mounting Height Dimensions • see Chart 3.1 for dimensions

Dimension C

Dim. A

Dim. B

Dim. A

Dim. C

Dim. C

Note: Dimensions A, B & C are based upon heaters hung at the factory recommended mounting height.

11

!

3.0 Installation • Hanger Placement and Suspension

LS3 Series

Hanger Placement and Suspension

WARNING

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.

Suspension of the heater must conform to applicable codes referenced in the Safety section and
these instructions.

Lay all radiant tubing out in the following order. Position tubes in approximate location (see Figure 3.2).

1

• 10 ft. 4” O.D. or 4” to 3” O.D. titanium treated combustion chamber.

• 3” O.D. aluminized radiant emitter tube(s) if applicable.

Connect the female end of the titanium combustion chamber to the 16” burner tube by

2

using the 4” stainless steel tube clamp (TP-220).

Important! The 10 ft. titanium 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.

Place a 4” tube hanger (TP-19B) on the tapered titanium combustion chamber’s 4” O.D. end. The

3

spacing between the burner control box mounting brackets and the 4” tube hanger should be 2’-4”.

Mark locations for hanging points.

4

NOTE: If the available hanging points do not allow for the recommended spacing then additional

hangers (P/N: TP-19B(4”) or TP-1079(3”)) may be necessary.

• The spacing between the burner control box mounting brackets and the first hanger should be
approximately 2’-4”.

• The space between the first two hangers placed on the first tube, should be approximately 8’-10”.

• The space between hangers thereafter, one per tube, should be approximately 9’-8”.

12

LS3 Series

Figure 3.2 • Heater Mounting Layout

3.0 Installation • Hanger Placement and Suspension

NOTE: A sticker identifying the combustion chamber(s) is located on the

swaged end of the tube(s).

Suspension

Point

Suspension

2’ 4”

Point

8’ 10”

3” or 4” Tube
Clamp (TP-1077
or TP-21B )

3” or 4” Tube Hanger
(TP-1079 or T P-19B)

Burner Control Box

Suspension Points

Igniter/

Sensor Box

Suspension

Point

9’ 8”

9’ 8”

3” O.D. Aluminized
Steel Radiant Emitter
Tube(s) (if applicable)

10 ft. 4” to 3” O.D. Tapered or 10 Ft. 4” O.D.
Titanium Treated Combustion Chamber

4” Tube Hanger (TP-19B)

4” Stainless Steel
Tube Clamp (TP-220)

16” Burner

Burner

Control Box

Tube

Chart 3.2 • Heater Mounting Requirements and Weights

Model

10 f t. 12’-1” 2 2 70 lbs. 4 N/A 2 N/A

15 f t. 16 ’-10” 3 2 85 lbs. 5 N/A 3 N/A

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

20 ft. 21’-10” 3 2 100 lbs. 5 6 3 2

30 ft. 31’-7” 4 2 120 lbs. 6 7 4 3

* Refer to page 18 for U-bend configuration dimensions.

13

3.0 Installation • Hanger Placement and Suspension

Prepare mounting surface, if necessary weld blocks, drill holes (see figure 3.3).

5

NOTE: The burner control box and radiant tubes should be in straight alignment and level.

Fasten beam clamp, screw hook or other type of suspension anchor to hanging point.

6

Attach and close S-hook (P/N: S-Hook) and #1 double-loop chain (P/N: THCS) to anchor. Check that

7

it is securely attached. NOTE: Threaded rod and turnbuckles may be used.

Attach hangers to chains. Adjust chain lengths until radiant tubing is level and equal weight distribution

8

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 3.3 • Mounting the Hangers

I-Beam

5

5

I-Beam

LS3 Series

Beam Clamp

6

Threaded Rod

7

and Turnbuckle

Concrete Beam

5

Screw Hook

6

Beam Clamp

6

S-Hook and

7

#1 Double-Loop Chain

Chain

8

Wood Beam

5

8

Chain

Screw hook

6

with Locknut

and Washer

14

Chain

8

LS3 Series

Figure 3.4 • U-Tube Hanger Mounting Options

Single Mounting

Bracket

3.0 Installation • Hanger Placement and Suspension

Brass Knuckle

Exhaust

End

U-Tubes can be mounted from a single suspension
point using an optional Single Mounting Bracket
(P/N: SMB) with five S-hooks and #1 double-loop
chains.

Figure 3.5 • Angled Hanger Mounting Options

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) fittings, #1 double-loop
chains and S-hooks.

45°

30°

15°

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) fitting with a #1 double­loop chain and S-hook.

15

3.0 Installation • Radiant Tube Assembly

Radiant Tube Assembly

To install the radiant tubes:

Place tubes in hangers with the welded seam facing downward and the swaged end of the tube

1

towards the exhaust end of the heater system (see Figure 3.6).

Refer to page 22 for tube installation sequence.

Figure 3.6 • Attach Hangers

Radiant Tube

LS3 Series

Swaged End

Hanger

Welded seam

faces down

Slide tube clamps onto radiant tubes (see figure 3.7).

2

Figure 3.7 • Attach Tube Clamps

Concave surface

Tube Clamp

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.

16

LS3 Series

Slip-fit the radiant tube sections together until tightly connected (install the swaged end of each tube

3

3.0 Installation • Tubes: Optional Elbow or U-Bend Accessory Configuration

towards exhaust end). NOTE: If it is difficult to mate the tubes, they may be installed incorrectly.

Center tube clamps over the seam where two radiant tube sections connect. If necessary, rotate tube

4

clamps so they will not interfere with the reflector end caps during expansion and contraction of

the heater.

Tighten tube clamp bolts to secure. When proper compression is obtained (40-60 ft-lbs. torque) the

5

tube seam will create a visible mark on the tube clamp. NOTE: Excessive torque may damage the

tube clamp.

Determine the location of the burner control box and note the placement of the mounting chains.

6

Figure 3.8 • Tube Connections

Tubes fit snuggly together and the

tube clamp is centered over the seam.

The tube clamp is tight when the

torque is achieved (normally

when seam becomes visible).

Tubes are not fit snuggly

together and the tube clamp is

not centered over the seam.

Correct Tube Connection Incorrect Tube Connection

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 reflector) elbow or U-bend accessory fitting 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.

Figure 3.9 • Optional Tube Connections

90 Degree 3” Elbow

(P/N: DB-E6) or

4” Elbow (P/N: E6)

180 Degree 3” U-Bend

(P/N: DB-TF1B) or

4” U-Bend (P/N: TF1B)

17

3.0 Installation • Optional Elbow or U-Bend Accessory Configuration

LS3 Series

Figure 3.10 • Elbow and U-Bend Clearances

Tube Clamp

Tube Clamp

8”

Figure 3.11 • U-Bend and Elbow Dimensions

180 Degree 3” U-Bend

P/N: DB-TF1B

180 Degree 4” U-Bend

P/N: TF1B

Dimension A

Dimension A

12”

Dimension B

Elbow can be set

in both directions

Tube Clamp

U-Bend can be set in both directions

Tube Clamp

90 Degree 3” Elbow

P/N: DB-E6

90 Degree 4” Elbow

P/N: E6

10”

6”

15”

16”

18”

10”

20”

6”

16”

16”

20”

20”

See Chart 3.6 on page 22 for tube diameters and locations.

Chart 3.3

Minimum Distance From Burner
Control Box to Elbow or U-bend
Accessory Fitting

Model BTU Range Dimension A

25,000 N/A

30,000 N/A

40,000 10 ft.

50,000 10 ft.

Chart 3.4

Overall Dimensions for Heaters Configured With U-Bend

Tube Length Dimension B Notes

10 ft. N/A N/A

15 f t. N/A N/A

20 ft. 13’-0 ” N/A

30 ft. 17’- 8 ” Requires P/N: LV3-5EA-SUB *

* The LV3-5EA-SUB add-on may only be ordered at the time of
heater production.

11. 5 ”

11. 5 ”

12.5”

12.5”

18

LS3 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.

Determine the mounting chain locations for hanging the burner control box.

1

Fasten beam clamp, screw hook or other type of suspension anchor to hanging point.

2

Attach S-hook and #1 double loop chain (P/N: THCS) to anchor. Check that it is securely connected.

3

Attach chain assemblies and S-hooks to mounting brackets on the burner control box. Adjust chain lengths

4

until level and in straight alignment with radiant tubes. Burner sight glass will be visible from the floor.

Figure 3.12 • Burner Control Box Assembly • Side View

1

2
3

16 in. burner tube is in straight

alignment with combustion chamber

TP-1079 3” Hanger

4

9.625”

Burner

Sight Glass

12.875”

Figure 3.13 • Burner Control Box showing U-Shaped Configuration • End View

16”

TP- 220 4” Stainless
Steel Tube Clamp

32.5”

15”

TP-19B
4” Hanger

TP-1077

3” Tube Clamp

19

11. 25”

8.625”

4.5”

4”

18.5”

3.0 Installation • Reflector Assembly

LS3 Series

Reflector Assembly

To install the reflectors (see Figure 3.14):

Attach the reflector center supports onto radiant tubes.

1

Slide each reflector section through the hangers and adjust the reflector tension spring into the

2

V-groove on the top of the reflector. The reflectors should overlap approximately 4 inches.

To prevent the reflectors from shifting, secure the reflector sections together using sheet metal

3

screws, except at the expansion joint (see p.22). NOTE: Installer to supply sheet metal screws.

Attach reflector end caps with polished finish inward to each end of the reflector run. Secure with

4

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 reflector accessories are necessary (see Chart 3.5).

Figure 3.14 • Reflector Assembly

Hanger

and Chain

Reflector

Reflector Center

Support

Radiant

Tube

Place at the

mid-point

of the tube

Reflector
Tension
Spring

4” Overlap

20

Reflector
End Cap

Clips

LS3 Series

Chart 3.5

•

Common Optional Accessories

3.0 Installation • Common Reflector Accessories

Reflector Accessory Description Part Number

Elbow Reflector* 90° bend, highly polished aluminum reflector elbow RE

designed to fit atop one elbow accessory fitting.

U-Reflector* 180° bend, highly polished aluminum reflector U-bend RU
designed to fit atop one U-bend accessory fitting.

Side Shield Extension** Highly polished side shield extension used to direct SSE
infrared rays downward, away from sidewalls and combustibles.

Protective Guard Used to prevent debris or objects from becoming lodged PG
between the radiant tube and reflector. Required when

mounting heaters below 8 ft.

* Reflectors cannot be rotated when used with a reflector elbow (RE), U-shaped reflector (RU), or
side shield (SSE).
** Refer to the Clearance to Combustible chart on page 9 for minimum distances to combustibles when
side shield extension(s) are used.

Additional accessory options are listed in the Detroit Radiant Products Company Tube Heater Accessory
Guide or online at

www.detroitradiant.com

.

Figure 3.15 • Reflector Shield Accessories

Elbow reflector (P/N: RE)
Used over a 90-degree
elbow radiant tube.

U-shaped reflector (P/N: RU)
Used over a ‘U’ shaped
radiant tube.

21

Side shield extension (P/N: SSE)
Directs infrared rays downward, away
from sidewalls and combustibles.

3.0 Installation • Final Heater Assembly

LS3 Series

Final Heater Assembly

Chart 3.6 • Tube Installation Sequence, Baffle Location and Secured Joints for Reflectors

25,000 - 40,000 BTU/h Models

10 Foot

A

15 Foot

A

20 Foot

A

50,000 BTU/h Models

15 Foot

C B

NOTE: When securing joints on
reflectors which are rotated on
an angle from horizontal, secure
joint only on top side of reflector
to allow for sufficient heater
expansion and contraction.

D

0° Mounting Angle

D

1 to 45° Mounting Angle

20 Foot

30 Foot

C B

C B D

Burner Control Box
w/16 in. Burner Tube

Expansion Joint on
Reflectors

Secured Joint on
Reflectors

Secure vent material to exchanger with
three #8 sheet metal screws. Seal with
high temperature silicone sealant. Do
not use tube clamp.

A

B

C

D

Key

4” to 3” Tapered Titanium Treated
Combustion Chamber with 4” Stainless
Steel Clamp

4” to 3” Tapered Aluminized Steel
Tube Exchanger with 4” Clamp

4” Titanium Treated Combustion
Chamber with 4” Stainless Steel Clamp

3” Aluminized Radiant Tube Exchanger
with 3” Clamp

22

LS3 Series

!

!

!

3.0 Installation • Venting • Replacing Existing Equipment

Venting

The LS3 Series tube heater must be vented as described here to properly direct flue gases from the unit
to the outside atmosphere. The venting can terminate vertically through the roof (up) or horizontally
through a sidewall (sideways).

Follow these guidelines and all applicable codes for all models prior to installing the vent material. Local
codes may vary.

In the absence of local codes, refer to:

United States: NFPA 54/ANSI Z223.1 (latest edition), National Fuel Gas Code.
Canada: CAN/CGA B149.1 and B149.2 Installation Codes for Gas Burning Appliances.

WARNING

Gas-fired heaters must be vented. A built in power exhauster is
provided. Additional external power exhausters are not required
or permitted.

Insufficient ventilation and/or improperly sealed vents may
release gas into the building which could result in health problems, carbon monoxide poisoning or death.
Improper venting may result in fire, explosion, injury or death.

WARNING

Do not vent this appliance into another heater’s vents or through a masonry chimney.

Do not use dampers in the heater vent pipe.

Single Wall vent pipe must not pass through any unoccupied attic, inside wall, concealed space, or floor.

Un-insulated single wall vent pipe must not be used outdoors for venting appliances in regions where
winter design temperature is below freezing.

Replacing Existing Equipment

If the heater is replacing existing equipment and using an existing vent system, inspect the venting for
proper size and horizontal pitch as directed in these instructions and the latest edition of the National Fuel
Gas Code, ANSI Z223.1 (NFPA 54) or CSA B149.1 Installation Code.

Determine that there is no blockage or restriction, leakage, corrosion or other deficiencies that can cause
hazards. The vent pipe should be corrosion-resistant galvanized steel of a thickness that meets the
National Fuel Gas Code. Minimum thickness for connectors varies depending on the pipe diameter. Never
vent the LS3 Series with PVC or plastic pipe.

WARNING

If replacing an existing heater, vents may require re-sizing. Improperly sized venting
systems can result in vent gas leakage or condensation. Refer to the National Fuel Gas
Code ANSI Z223.1 (NFPA 54) or CSA B149.1 - latest edition. Failure to follow these
instructions can result in serious injury or death.

23

3.0 Installation • General Venting Requirements

LS3 Series

General Venting Requirements

The venting system for LS3 Series heaters may terminate horizontally through a sidewall or vertically
through the roof, and may be individually or commonly vented. Configuration of the vent termination
determines the category type. All model heaters must be installed in accordance to the requirements of
this section, as well as the requirements of its category determination, as described in this manual. To
determine your applications category type, review ‘Vertical Venting’ (Category I) and ‘Horizontal Venting’
(Category III) sections of this manual.

All LS3 Series Model Requirements:

• Exhaust vent pipe must be 3 inch nominal size.

• Use vent pipe material that is corrosion-resistant galvanized steel of a thickness that meets the
National Fuel Gas Code.

• Do not exceed a maximum vent length of 20 feet.

• Maintain a minimum vent length of 3 feet.

• Maintain a minimum 12 inches of straight pipe from the flue outlet before any directional changes
are made in the venting system.

• Have all vent pipe seams or connectors fastened together with at least three corrosion resistant
sheet metal screws (field supplied).

• Maintain a 6 inch clearance around all single wall vent pipe from any combustible materials. For
double wall vent pipe (type B) follow the vent manufacturer’s clearance to combustibles.

• The equivalent length for a 3 inch 90° elbow is 3 feet.

• The equivalent length for a 4 inch 90° elbow is 5 feet.

• Avoid using more than two 90° directional changes in the venting system.

• Horizontal sections of the vent pipe must be installed with an upward slope from the appliance at a
pitch of ¼ inch per foot.

• Suspend and secure all horizontal runs at points no greater than 3 feet apart.

• Vent termination must maintain a minimum distance of 6 feet from any mechanical air supply inlet.

• Vent must terminate a minimum of 4 feet below, 4 feet horizontally from, or 1 foot above any window
or door that may be opened or gravity air inlet into the building.

• Vent must terminate a minimum of 4 feet above grade level and must extend beyond any
combustible overhang. Vents adjacent to the public walkways must terminate a minimum of 7 feet
above grade level.

• The vent terminal must be installed to prevent any blockage by snow and protect building material
from degradation by flue gases.

• The vent cap must be a minimum of 6 inches from the sidewall of the building.

• Vent must be a minimum of 36 inches below or extend beyond any combustible overhang.

• Consult NFPA ANSI Z223.1 Gas Vent Termination criteria for vents that terminate on a roof pitch that
exceeds 9:12.

• Canada: Vents must terminate a minimum of 3 feet from a window or door that may be opened, and
a non-mechanical air supply inlet or combustion air inlet into the building.

24

LS3 Series

Figure 3.16 • General Venting Requirements

24 in.
Min.*

3.0 Installation • General Venting Requirements

Vent Cap

Roof*

Double-Wall B Vent

Heater

Storm Collar
Adjustable Roof Flashing

1 in. Minimum Clearance
(Use attic insulation shield
if required)

Fire Stop Spacer

B to C Adapter

Clean Out Tee Fitting

Clean Out Cap

#8 Sheet Metal Screws (field supplied)

*Consult the NFPA ANSI Z223.1 Gas Vent Termination criteria if roof pitch exceeds 9:12

When possible, avoid venting through an unconditioned space. Venting through an unconditioned space
promotes condensation. When venting through an unconditioned space is unavoidable, or if the unit is
installed in an area that is prone to condensation, insulate venting runs greater than 5 feet to minimize the
production of condensation. Inspect for leakage prior to insulating the venting and only use insulation that
is non-combustible with a temperature rating of not less than 400°F. Install a tee fitting at the low point of
the vent system and provide a drip leg with a clean out cap as shown in Figure 3.16.

When venting pipe passes through a combustible interior wall or floor, a metal thimble with a diameter 4
inches greater than the vent pipe diameter must be used. If there is 6 feet or more of vent pipe prior to
passing through the combustible wall or floor, then the metal thimble need only be 2 inches greater than
the vent pipe diameter. If a metal thimble is not used, all clearance to combustibles from the vent pipe
must be 6 inches. Where permitted, type B vent may be used for the last section of vent pipe to reduce
the required clearance to combustibles when passing through a combustible wall or floor. When using
type B venting, follow the manufacturer’s recommended clearance to combustibles. Any material used to
close or insulate the opening must be non-combustible.

25

3.0 Installation • Vertical Venting (Category I)

LS3 Series

Vertical Venting (Category I)

An appliance that operates with a non-positive vent static pressure and with a vent gas temperature that
avoids excessive condensate production in the vent is said to be ‘Category I’. The LS3 Series heater is
considered a Category I appliance if the venting system meets all of the following criteria:

• The vent system terminates vertically (up).

• The length of the horizontal portion of the vent run is less than 75% of the vertical rise length. (e.g.- If
the vertical vent height is 10 feet, the horizontal run is less than 7-1/2 feet).

• The vent terminates a minimum of 5 feet above the vent connection on the unit.

For vertical vent termination, the venting must comply with all parts of this section, in addition to the
requirements of the general venting.

Category I (Vertical) venting is venting at a non-positive pressure. An appliance vented as a Category I
is considered a fan-assisted appliance and the vent system does not have to be ‘gas tight’. It is
recommended that the venting system is installed with a tee, drip leg, and clean-out cap as shown in
Figure 3.17.

Vent Locations and Clearances:

• Separate air intake duct from vent pipe by a minimum of 4 feet by placing vent pipes higher than
adjacent air intake ducts.

• Utilize a listed type B vent termination cap.

• The vent terminal must extend a minimum of 2 feet above the roof.

• Vent caps should be located a minimum of 2 feet away from adjoining structures.

All vertically vented heaters that are Category I must be connected to a chimney or vent complying with
a recognized Standard, or lined masonry (or concrete) chimney with a material acceptable to the
authority having jurisdiction. Venting into an unlined masonry chimney is not permitted. Refer to the
National Fuel Gas Code and page 24 of this manual.

Use a listed vent terminal to reduce down drafts and moisture in the vent.

26

LS3 Series

Figure 3.17 • Rooftop Venting - Side View

3.0 Installation • Horizontal Venting (Category III)

Vent Cap

B to C Adapter

Clean Out Tee Fitting

Clean Out Cap

*Consult the NFPA ANSI Z223.1 Gas Vent Termination criteria if roof pitch exceeds 9:12.

24 in. Min.*

3” Single-Wall Pipe

Roof

Double-Wall B-Vent Pipe

Firestop Spacer

Heater

Horizontal Venting (Category III)

An appliance that operates with a positive vent static pressure and with a vent gas temperature that
avoids excessive condensate production in the vent is said to be ‘Category III’. The LS3 Series heater is

considered a Category III appliance if the venting system meets all of the following criteria:

• The vent system terminates horizontally (sideways).

• The vent terminates vertically, but the length of the horizontal portion of the vent run exceeds 75% of
the vertical rise length. (e.g.- If the vertical vent height is 10 feet, the horizontal run is greater than
7-1/2 feet).

• The vent terminates below 5 feet of the vent connection on the unit.

Seal vent pipes with high temperature sealant and three (3) #8 sheet metal screws. Vent enclosed
spaces and buildings according to the guidelines in this manual and applicable national, state,
provincial and local codes.

You may either use an agency certified Category III venting system, or single wall vent pipe with all the
seams and joints sealed with metallic tape or silicone sealant suitable for temperatures up to 400°F.
Wrap the tape two full turns around the vent pipe. For single wall vent systems, one continuous section
of double wall vent pipe may be used with the vent system to pass through a wall or barrier.

All horizontal Category III vents must be terminated with a Simpson-Duravent sidewall vent cap (P/N:
SWD-4 for 4-inch venting or P/N: DB-208 for 3-inch venting).

27

3.0 Installation • Vent Locations and Clearances • Sidewall Venting Requirements

LS3 Series

Vent Locations and Clearances:

• Category III venting systems may NOT be common vented, and no other gas units are allowed to be
vented into it.

• Vent must terminate a minimum of 4 feet below, 4 feet horizontally from, or 1 foot above any window
or door that may be opened or gravity air inlet into the building.

• Vent must terminate a minimum of 3 feet above any forced air inlet that is located within 10 feet.

• Horizontal venting sections of the vent pipe on a Category III termination must be installed with a
downward slope from the appliance at a pitch of 1/4 inch per foot. Do not pitch heater.

• The bottom of the vent terminate must be located a minimum of 12 inches above grade level and
must extend beyond any combustible overhang. Vents adjacent to public walkways must terminate a
minimum of 7 feet above grade level.

• The vent terminal must be installed to prevent blockage by snow and protect building materials from
degradation by flue gasses.

• The vent cap must be a minimum of 6 inches from the sidewall of the building.

• Vent must be a minimum of 36 inches below or extend beyond any combustible overhang.

• Vents must terminate a minimum of 3 feet from a window or door that may be opened, and a non­mechanical air supply inlet or combustion air inlet into the building.

• Vents must terminate a minimum of 6 feet from a mechanical air supply inlet.

Never join two sections of double wall vent pipe within one horizontal vent system, as it is impossible to
verify that inner pipes are completely sealed.

Figure 3.18 •

Building Overhang*

Sidewall Vent Cap

Sidewall Venting Requirements

36 in.
min.*

Wall Thimble

6 in.

min.*

Sidewall

3” Single-Wall Vent Pipe

B to C Adapter

Double-Wall
B-Vent

Heater

Single
Wall Vent

1/4 in. downward

pitch per foot

*Vent must extend beyond any combustible overhang if the vent is less than 36 in. below the combustible overhang.

28

LS3 Series

3.0 Installation • Common Venting (Category I) • Common Rooftop Venting

Common Venting (Category I)

The common vent system and all attached appliances must be Category I.

The vent connector should be routed in the most direct route from the units to the common vent.

Where two or more vent connectors enter a common gas vent or chimney flue, the smaller connector shall
enter at the highest level consistent with the available head room or clearance to combustible material.

Restrictions within the common vent such as elbows should be minimized. Each elbow installed within the
common portion of the vent carrying system reduces the maximum common vent capacity by 10%. Refer
to NFPA 54 IFEC tables 11.2 and 11.3 for capacity.

The vent connector capacities allow for the use of two 90° directional changes. For each additional
required elbow, the vent connector capacity is reduced by 10%.

The common vent cross sectional area must be equal to or greater than the largest vent connector cross
sectional area.

Figure 3.19 •

Double-Wall B-Vent

Common Rooftop Venting - Side View

Rooftop Vent Cap

Firestop Spacer

4” Single-Wall

Vent Pipe

Heater

24 in.

M i n .* *

Roof

Heater

Dual Exhaust Assembly

**Consult the NFPA ANSI Z223.1 Gas Vent Termination criteria if roof pitch exceeds 9:12.

3” Single-Wall Vent Pipe

29

!

3.0 Installation • Combustion Air Requirements

LS3 Series

Combustion Air Requirements

Combustion air may be supplied to the heater by indoor or outdoor means. Follow these guidelines and all
applicable codes for all models prior to installing the combustion air duct work. Local codes may vary. In
the absence of local codes, refer and comply with the National Fuel Code ANSI Z223.1 (NFPA 54) latest
edition or the National Standards of Canada.

WARNING

Sufficient combustion air must be supplied to the appliance at all times.
Lack of combustion air may result in property damage, serious injury or death.

This unit comes standard equipped for connection of supplied outdoor air for combustion. It is designed
for outside air to be brought into the appliance from combustion intake ducts, and is referred to as a
“Separated Combustion” appliance.

This heater must operate as a separated combustion system if any of the following criteria apply:

• Chemicals such as chlorinated or fluorinated hydrocarbons (typical sources are refrigerants,
solvents, adhesives, degreasers, paints, paint removers, lubricants, pesticides, etc.) are present in
the atmosphere.

• High humidity.

• Contaminants such as sawdust, welding smoke, etc.

• Negative building pressure.

• Unusually tight construction where the air infiltration rate is less than 0.40 air changes per hour.

If your application does not meet any of these criteria, then room air may be used as supplying
combustion air to the heater. Refer to ‘Combustion Air Supply - Room Air’ on page 32 for details on how to
utilize room air for combustion.

Figure 3.20 • Vertical Outside Air Supply for Common Intake • Side View

NOTE: Common intake

heaters must share the
same thermostat.

18 in.

minimum

Roof Intake Cap

6” pipe

Roof

Air Inlet Connection

Burner

Control Box

4” intake pipe4” intake pipe

Air Inlet Connection

Burner

Control Box

(Flexible boot and band
clamps are recommended)

30

LS3 Series

3.0 Installation • Separated Combustion Systems

Separated Combustion Systems (Outside Combustion Air)

All LS3 Series heaters come with a factory-installed combustion air adapter for attaching air intake ducts
to the heater. Attach the air intake duct material to the adapter with three (3) non-corrosive sheet metal
screws. If necessary, drill pilot holes prior to attaching the air intake ducts. The diameter of the intake
ducts must not be smaller than the factory installed adapter.

When operating this unit as a separated combustion heater system, combustion air must be supplied to
the heater by outdoor means through the factory installed vent connector. The combustion air intake duct
may terminate horizontally through a sidewall or vertically through the roof. Ideally, the intake should
terminate within the same pressure zone as the venting terminates, which should minimize the effects of
wind.

All Separated Combustion systems must comply with the following items:

• Air intake ducts must be of galvanized steel or an equivalent corrosion-resistant material.

• Do not exceed a length of 20 feet.

• Do not exceed more than two (2) 90° directional changes (elbows) in the system.

• Seal all joints with metallic tape or silicone sealant. Wrap the tape two full turns around the vent
pipe.

• Slope air intake pipe ¼ inch per foot upward or downward away from the unit.

• Do not draw air from attic space.

• Do not draw fresh air from the remaining space around a chimney liner, gas vent, special gas vent,
or plastic piping installed within masonry, metal, or factory built chimney.

• Combustion air ducts may be insulated if they pass through an unconditioned space.

• A factory approved sidewall intake cap must be used when terminating the combustion air ducts
horizontally through the sidewall.

• When combustion air ducts terminate vertically through the roof, a minimum of 18 inches above the
roof grade must be maintained.

• Separate the air intake duct from vent pipe a minimum of 4 feet. Also, place vent pipe higher than
adjacent air intake duct.

• Air intake duct must terminate a minimum of 3 feet below any forced air vent discharge that is
located within 10 feet.

• The bottom of the air intake duct termination must be located a minimum of 12 inches above grade
level. Air intake ducts that terminate adjacent to public walkways must be installed a minimum of 7
feet above grade level.

• The air intake duct must be installed to prevent blockage by snow, debris, or other possible
obstructions.

31

3.0 Installation • Separated Combustion Systems • Combustion Air Requirements

Figure 3.21 • Outside Combustion Air Vertical Intake - Side View

3 ft. Min.

(If X if less than 10 ft.)

Combustion Air

Intake Cap

18 in.

Min.

X

Storm Collar
Listed

Flashing

LS3 Series

Exhaust Vent
(from any other appliance)

Roof

Air Inlet Connection (Flexible boot and

band clamps are recommended)

Cleanout Tee

Burner

Control Box

Figure 3.22 • Outside Combustion Air Sidewall Intake - Side View

Listed Wall Thimble

Air Inlet Connection

band clamps are recommended)

Combustion Air

Intake Cap

Vent Termination

Support Brackets

6 in.
Min.

4” Pipe

1/4 in. pitch per foot

(upward or downward)

(Flexible boot and

Burner

Control Box

Combustion Air Supply - Room Air

Combustion air may be supplied to the heater by indoor or outdoor means.

If using combustion air from indoors, the required volume of the space must be a minimum of 50 ft
1000 Btu/hr unless the building is of unusually tight construction. If the building is of unusually tight
construction with air infiltration rates of less than 0.40 air changes per hour, outside combustion air is
typically needed unless the sheer size of the building allows otherwise. Contact the factory for further
determination of air infiltration rates.

32

3

per

LS3 Series

!

Non-contaminated outside air for combustion must be ducted to the heater if any of the following apply:

• Chemicals such as chlorinated or fluorinated hydrocarbons (typical sources are refrigerants,
solvents, adhesives, degreasers, paints, paint removers, lubricants, pesticides, etc.) are present in
the atmosphere.

• High humidity.

• Contaminants such as sawdust, welding smoke, etc.

• Negative building pressure.

• Unusually tight construction where there is an air infiltration rate of less than 0.40 per hour.

3.0 Installation • Combustion Air Supply • Optional Unvented Operation

Optional Unvented Operation

WARNING

This appliance must be vented in residential installations.

residential spaces may result in property damage, serious injury or death. Use unvented
operation in commercial and industrial installations with proper ventilation rates only.

When using an unvented configuration (commercial & industrial use only), consider the following:

• A factory vent cap/diffuser (P/N: WVE-3) must be used.

• Where unvented heaters are used, natural or mechanical means must be provided to
supply and exhaust a minimum of 4 cfm/1000 Btu/h input of installed heaters.

NOTE: Gravity or mechanical means may be used to accomplish the air displacement.
Local codes may require that the mechanical exhaust system be interlocked with the
electrical supply line to the heaters, enabling both to function simultaneously.

• The minimum clearance between the air intake and the exhaust terminal is 4 ft.

NOTE: When installing in a U-tube configuration, use extra caution to separate vent gases
from heater intake.

• Exhaust openings for removing the flue products must be located above the level of the
heater(s).

Unvented tube heaters in

Figure 3.23 • Minimum End Clearances

12 in. Min.

All heaters

33

12 in. Min.

Unvented

heaters

3.0 Installation • Gas Supply

!

!

LS3 Series

Gas Supply Installation Instructions

The gas supply to the tube heater must be connected and tested in accordance with national, state,
provincial, and local codes along with guidelines in this manual. In the United States refer to the latest
edition of the ANSI Z223.1 (NFPA 54) Standard and in Canada refer to the latest edition of the CAN/
CGA B149.1 Standard.

Supply gas piping to the unit should conform with the local and national requirements for type and
volume of gas handled, and pressure drop allowed in the line. Avoid pipe sizes smaller than 1/2”.
The installation must conform with local building codes or, in the absence of such codes, the National Fuel
Code (NFPA 54) and in conjunction with ANSI Z21.24/CSA 6.10 “Connectors for Gas Appliances”.

WARNING

Improperly connected gas lines may result in serious injury and death,
explosion, poisonous fumes, toxic gases or asphyxiation. Connect gas lines in
accordance to national, state, provincial and local codes.

Gas pressure to the appliance controls must never exceed 1/2 PSI (14” W.C.). Damage to the controls
may result.

CAUTION

Gas lines should be purged of air as described in ANSI Z223.1 (NFPA 54) or CSA-B149.1– latest
edition. Installation of the piping must also conform with the local building codes, or in the absence
of local codes, with the latest edition of the National Fuel Gas Code (NFPA 54). In Canada,
installation must be in accordance with CSA-B149.1

NOTICE

The total input to the appliance must fall within +/- 5% of the rated input as indicated on the rating
plate. Otherwise the heat exchanger may prematurely fail.

IMPORTANT! The heating system will expand and contract during operation. Allowances for expansion
must be made between the connection to the heater and the gas supply. A flexible gas connection

of approved type is required. Flexible stainless steel gas connectors installed in one plane, and without
sharp bends, kinks or twists is recommended.

34

LS3 Series

!

!

IMPORTANT! Before connecting the gas supply to the burner control box:

• Verify that the heater’s gas type (as listed on the rating plate) matches that of your application and
the installation complies with national and local codes and requirements of the local gas company.

• Unless otherwise noted on the rating plate, this infrared heater is designed and orificed to operate
on standard BTU gas. Contact the factory if utilizing non-standard BTU gas.

• Check that the gas piping and service has the capacity to handle the total gas consumption of all
heaters being installed, as well as any other gas appliances being connected to the supply line.

• Check that the main gas supply line is of proper diameter to supply the required fuel pressures.

• If utilizing used pipe, verify that its condition is clean and comparable to a new pipe. Test all gas
supply lines in accordance with local codes.

3.0 Installation • Gas Supply

To connect the gas:

WARNING

Failure to install, operate or service this appliance in the approved manner may result in
property damage, injury or death. Only trained, qualified gas installation and service
personnel may install or service this equipment.

The LS3 Series heater is equipped to connect to the corrugated stainless steel tube (CSST) flexible gas
connector (Included). Do not connect the main gas line directly to the heaters gas inlet without the
use of the flexible connector. All piping must be installed in accordance with the requirements outlined
in the National Fuel Gas Code ANSI/Z223.1 (latest edition) or CSA-B149.1 and B149.2. Support all gas
piping with pipe hangers, metal strapping, or other suitable material. Do not rely on the heater to support
the gas pipe.

When connecting piping to the unit, the use of a thread joint compound is required. The thread compound
(pipe dope) shall be resistant to the action of liquefied petroleum gas or any other chemical constituents of
the gas to be conducted through piping. Use of Teflon

®

tape is not permitted.

WARNING

Always use two (2) opposing wrenches to tighten mating pipe connections to
prevent excessive torque on the gas valve and manifold pipe. Excessive
torque can damage the valve and/or misalign the orifice, resulting in fire,
explosion, serious injury or death.

Install ground joint union with a brass seat and a manual shut-off valve adjacent to the unit for emergency
shut-off and easy servicing of controls. A 1/8” NPT plugged tap that is accessible for a test gauge
connection is also recommended, as illustrated in Figures 3.24 & 3.25.

A sediment trap must be installed in the supply line in the lowest spot prior to connecting to the heater.
The trap length shall be at least three inches long. Ideally, the trap would be installed as close as possible
to the shut-off, as shown in Figure 3.24.

35

3.0 Installation • Gas Supply

NEUTRAL

EARTH

HOT

- 120V HEATER INPUT -

120V

G W1 W2 R

!

LS3 Series

Connect the main gas supply line with an approved flexible connector or, if the authority having jurisdiction
requires rigid piping, the use of approved swing joints may be used. If swing joints are utilized, the heater
must be allowed to freely expand and contract without causing undue stress on the gas pipe.

The heater shall not be connected to the building piping system with rigid pipe or semi-rigid metallic tubing,
including copper. When using such material, an intermediate connection device that allows for the heater
expansion must be used.

The gas outlet must be in the same room as the appliance is installed, and must be accessible. It may not
be concealed within or run through any wall, floor or partition. When installing the heater in a corrosive
environment (or near corrosive substances), use a gas connector suitable for the environment. Do not use
the gas piping to electrically ground the heater.

Installation of the Gas Line to the Heater

Install a sediment trap / drip leg in the supply line at the lowest spot prior to the gas ball valve. The trap

1

length shall be at least three inches long. Ideally, the trap would be installed as close as possible to
the shut off.

Install manual shut off ball valve with optional 1/8” NPT Test connection towards the supply line. The

2

manual shut off ball valve must be located within 6 feet of the appliance’s service access door.

Install the 5/8 inch flare to ½” NPT adapter piece downstream of the gas valve as shown in Figure

3

3.24. This piece is typically included with the flexible gas connector, loosely installed on one of the

flare nuts. NOTE: Keep flare surfaces clean and free of sealing compounds. Only the pipe threads
require sealing compounds.

Form the stainless steel flexible connector into a smooth C-shape, allowing approximately 12 inches

4

between the flexible connector’s end nuts (see Figure 3.24). The connector must reach from the gas
supply to the appliance without stretching, kinking, or twisting.

Attach the flexible connector to the 5/8” flare adapter on the gas line and the other end to the 5/8”

5

flare on the heaters inlet pipe. DO NOT connect the connector flare nuts directly to pipe threads. Use
only the adapters provided. DO NOT kink, twist or over-torque the connector when installing.

CAUTION

When using a stainless steel flexible gas connector, do not attach the connector nuts directly to the gas
pipe supply. Connector nuts must be installed to an approved adapter.

Figure 3.24 • Gas Connection (Flexible Gas
Connection shown) • Side View

Ball Valve w/

5/8” O.D. Flare to

1/2” NPT Adapter

12”

Stainless Steel
Gas Connector

5/8” O.D. Flare to

1/2” NPT Adapter

2 in. max displacement

Burner Control

Box Side View

Heater Movement

1/8” NPT Inlet Tap

3 inch minimum
Drip Leg/
Sediment Trap

Figure 3.25 • Gas Connection (Flexible Gas
Connection shown) • End View

Ball Valve w/ 1/8” NPT Inlet Tap

45°

45°

Burner Control Box End View

36

LS3 Series

3.0 Installation • Gas Supply

Refer to Chart 3.7 for natural gas and Chart 3.8 for propane to determine the cubic feet per hour (CFH)
required for the type of gas and size of unit to be installed. To determine the proper pipe diameter, use the
CFH value and the length of pipe necessary from Chart 3.9. In the case where several units are serviced by
the same main gas line, the total capacity (CFH) and length of main must be adequate to service all
appliances downstream of this main.

Chart 3.7 • Natural Gas Consumption

Model

LS3-(10,15)-25

LS3- (10,15 ) -30

LS3-(15,20) -40

LS3-(15,20,30) -50

Manifold

Input

25,000 BTU/h 3.5 5.0 23.8 41 DMS

30,000 BTU/h 3.5 5.0 28.6 37 DMS

40,000 BTU/h 3.5 5.0 38.1 31 DMS

50,000 BTU/h 3.5 5.0 4 7. 6 29 DMS

Pressure

(Inches W.C.)

Minimum Inlet

Pressure

(Inches W.C.)

Gas

Consumption*

(CFH) Orifice Size

* Assumes an average heating value of 1050 BTU/SCF and a Specific Gravity of 0.60.

Chart 3.8 • Propane Gas Consumption

Model Input

LS3-(10,15)-25

LS3- (10,15 ) -30

LS3-(15,20) -40

LS3-(15,20,30) -50

Manifold

Pressure

(Inches W.C.)

25,000 BTU/h 10.0 11. 0 10.0 0.27 53 DMS

30,000 BTU/h 10.0 11. 0 12.0 0.33 52 DMS

40,000 BTU/h 10.0 11. 0 16.0 0.44 1.90 m m

50,000 BTU/h 10.0 11. 0 20.0 0.55 2.15 mm

Minimum Inlet

Pressure

(Inches W.C.)

Gas

Consumption*

(CFH)

Gallons

per Hour*

Orifice

Size

* Assumes an average heating value of 2500 BTU/SCF and a Specific Gravity of 1.53.

Chart 3.9 allows for a 0.3 inch W.C. pressure drop in the supply pressure from the building main to the inlet
of the unit. Refer to the chart for the appropriate range of inlet pressures for each gas type. When sizing the
inlet gas pipe diameter, make sure that the unit supply pressure can be met after the 0.3 inch W.C. pressure
drop has been subtracted from the main pressure. If the 0.3 inch W.C. pressure drop is too high, refer to
NFPA 54 or the Gas Engineer’s Handbook for other gas pipe capacities.

37

!

!

3.0 Installation • Leak Testing

Chart 3.9 • Maximum capacity for Schedule 40 Metallic pipe, in CFH

LS3 Series

Pipe

Length

10 feet

20 feet

30 feet

40 feet

50 feet

60 feet

70 feet

80 feet

90 feet

100 feet

125 feet

150 feet

175 feet

200 feet

Nat Prop Nat Prop Nat Prop Nat Prop Nat Prop Nat Prop

132 86 278 182 520 340 1050 686 1600 1046 3050 1993

92 60 190 124 350 229 730 477 110 0 719 2100 1373

73 48 152 99 285 186 590 386 890 582 1650 1078

63 41 13 0 85 245 160 500 327 760 497 1450 948

56 37 115 75 215 141 440 288 670 438 1270 830

50 33 105 69 195 127 400 261 610 399 1150 752

46 30 96 63 180 118 370 242 560 366 1050 686

43 28 90 59 170 111 350 229 530 346 990 647

40 26 84 55 160 105 320 209 490 320 930 608

38 25 79 52 150 98 305 199 460 301 870 569

34 22 72 47 130 85 275 180 410 268 780 510

31 20 64 42 120 78 250 163 380 248 710 464

28 18 59 39 110 72 225 147 350 229 650 425

26 17 55 36 100 65 210 137 320 209 610 399

Leak Testing

1/2” 3/4” 1” 1-1/4” 1-1/2” 2”

WARNING

Testing for gas leaks with an open flame or other sources of ignition may lead
to a fire or explosion and cause serious injury or death. Test in accordance
with NFPA or local codes.

WARNING

Gas pressures to the appliance controls must never exceed 14 inches W.C. (1/2 PSI).
Supply pressures greater than 14” W.C. can damage the controls, resulting in personal
injury, property damage, or death.

Use a soap solution or equivalent for leak testing. Leak testing solution must be non-corrosive, and be
rinsed off immediately after the leak test. Never test for leak with an open flame. Failure to comply could
result in personal injury, property damage or death.

Always leak test final gas assembly for gas leaks according to the procedures outlined in NFPA 54 and
all local codes and/or Standards.

For leak testing on pressures below 1/2 PSI

Before leak testing, close the field installed manual shut off valve shown on Figure 3.24 on the supply
line to isolate the gas valve from the pressure. NOTE: All factory installed gas connections have passed
an approved leak test.

For leak testing on pressures above 1/2 PSI

When leak testing with pressures above 1/2 PSI (14 inches W.C.), the unit must be isolated from the
supply pipe. Close the field installed manual shut off valve, disconnect the supply line to the unit, and
temporarily cap the supply line for testing purposes.

38

LS3 Series

!

3.0 Installation • Electrical Requirements and Wiring Diagrams

Electrical Requirements and Wiring Diagrams

WARNING

Shock hazard. Disconnect power supply before making wiring connections to prevent

electrical shock and equipment damage.

Any original factory wiring that requires replacement must be replaced with wiring
material having a temperature rating of at least 105°C.

All field installed wiring to the tube heater must be done in accordance with the national, state,
provincial, local codes and to the guidelines in this manual. In the United States, refer to the most
current revisions to the Electrical Code ANSI/NFPA 70 and in Canada refer to the most current
revisions to the Canadian Electrical Code CSA C22.1 Part 1. The unit must be electrically grounded
according to these codes. Line polarity must be observed when making field connections.

Internal Wiring Diagrams

Before wiring this appliance, check the existing wiring; replace if necessary. If any of the original wire
supplied with the appliance must be replaced, it must be replaced with copper wiring material having a
rating of at least 600V, 105°C.

Figure 3.26 • LS3 Internal Wiring Diagram

39

3.0 Installation • Field Wiring Supply Voltage • Thermostat Connection

!

!

LS3 Series

Field Wiring Supply Voltage

Before proceeding with electrical connections, ensure that the supply voltage, frequency, phase and
current capacity meet the requirements specified on the rating plate. A dedicated line voltage supply
with properly sized wire should run directly from the main electrical panel to the heater. The power to
the unit must be protected with a circuit breaker appropriate for the load. The unit must be electrically
grounded in accordance with local codes, or in their absence, with the latest edition of the National
Electrical Code, ANSI / NFPA 70 and/or the Canadian Electrical Code CSA C22.1, latest edition.

CAUTION

The power supply to the heater must be within +/- 5% of the voltage rating as indicated on the rating
plate of the appliance. If input power does not meet these specifications, contact your utility company.

The heater comes equipped with a supply cord to connect the main power supply. It is located at the
rear of the heater’s burner box, and utilizes a grounding prong. This plug must be connected into an
appropriate outlet receptacle that is properly installed and grounded in accordance to local codes and
ordinances.

WARNING

Electric Shock Hazard

Do not force the three-prong plug into the grounded outlet, modify the plug, or use an
adapter. Never operate this appliance if the cord or plug is damaged.

The grounding receptacle must be installed within 5 feet of the heater’s service panel, and located in
the space occupied by the appliance. When plugging in the heater, make sure the supply cord is
protected from damage, and keep all cords away from the heater’s surfaces and out of the clearance to
combustible zones (see page 9). When routing the electrical supply for the unit, ensure that it does not
interfere or obstruct the heater’s service panel.

Thermostat Connection

NOTE: Different thermostats operate according to their particular features. Refer to the thermostat’s

specifications for details.

Prior to connecting the thermostat wire to the heater, check to make sure the wires will be long enough
to allow for the heater to freely expand and contract without causing undue strain on the wires or
terminal. Use 18 gauge wire (or larger) that is suitable for a NEC Class 2 rating for thermostat
connections.

Each LS3 Series heater requires a thermostat rated for 24VAC to operate. The heater comes standard
with a terminal strip for making the thermostatic connection, located on the back panel.

40

LS3 Series

3.0 Installation • Thermostat Connection

The thermostat terminal designations are as follows:

R: 24VAC Power

W: Call for Heat

C: Common for 24VAC Power (if required for thermostat power)

24VAC is supplied from an internal 40VA transformer. DO NOT supply 24 Volts to the terminal strip.

Figure 3.27 • Single Heater, Single Thermostat Connection

Controlling Multiple Heaters with a Single Control Device

When multiple heaters are operated by the same control device (for example, common vented heaters),
an external relay kit (Part #ERK) must be utilized per heater. This allows the heater’s 24V supply voltage to
be isolated from the external control voltage of the thermostats. The ERK is to be installed on or near the
heater. Follow the instructions that accompany the accessory for more information and wiring diagrams.

Figure 3.28 • Multiple Heaters, Single Thermostat Connection with External Relay Kit

L1

L2

THERMOSTAT

R

W

C

TRANSFORMER

120V

24V

OPTIONAL 24V COMMON
CHECK THERMOSTAT
INSTRUCTIONS TO SEE
IF NEEDED

HEATER

TERMINAL

RELAY BOX

P/N: ERK

(1 PER HEATER)

W

C

HEATER

TERMINAL

RELAY BOX

P/N: ERK

(1 PER HEATER)

W

C

HEATER

TERMINAL

RELAY BOX

P/N: ERK

(1 PER HEATER)

W

C

Thermostat Location

The location of the thermostat should be determined by the desired heating requirements and be
mounted on an inside wall five (5) feet above the finished floor. Locate the thermostat in a conspicuous
location, away from where it could be influenced by heat from the unit or other sources, as this may
cause the unit to short cycle. Care should be given to locate the thermostat away from drafts or
frequently opened doors. To prevent drafts inside the wall from affecting the thermostat’s performance,
plug hole for the wire with insulation or suitable caulk. For further information, see the accompanying
instructions with the thermostat.

41

3.0 Installation • Unit Start-up (Commissioning) • Pre-Start Up Checks

!

!

Unit Start-up (Commissioning)

WARNING

Improper installation, adjustment, alteration, service or maintenance can cause property
damage, serious injury, or death. This heater must be installed and serviced by a trained
gas installation and service personnel only.

CAUTION

Shock Hazard.

Before attempting to perform any service or maintenance, turn electrical power to unit
OFF at disconnect switch.

Pre-Start Up Checks

LS3 Series

Verify that the installation conforms to all of the specifications of the manual, as well as with local,
state, national, and provincial codes. In absence of local codes, the radiant heater must be
installed according to the current National Fuel Gas Code ANSI Z223.1 (NFPA 54). In Canada,
the installation must conform to the current National Standard of Canada CSA-B149 Sections 1 &

2.

Prior to starting up the unit, verify that:

9 The gas type listed on the rating label matches that of your application.

9 The gas connections have been purged of air and properly leak tested.

9 The voltage type and frequency listed on the rating label matches that of your application.

9 The unit is properly grounded as per the National Electrical Code, ANSI/NFPA 70 or

Canadian Electrical code CSA C22.1 Part 1.

9 The unit is properly mounted to a permanent structure able to bear the weight of the unit.

9 The proper mounting height is observed for the application.

9 All clearance to combustible distances or service clearances are maintained.

9 The unit is properly isolated or installed to prevent excessive vibration.

9 The unit is level horizontally.

9 Venting is properly installed in accordance with this manual and any applicable codes.

9 Combustion air supply is sufficient to support proper operation at all times.

42

LS3 Series

3.0 Installation • Verify Proper Inlet Pressure

Verify Proper Inlet Pressure

Before starting up the unit, smell all around the heater for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle on the floor.

When turning the gas shut off valve, only use your hand. Never use tools to turn the knobs, as it
may damage the valve resulting in a fire or explosion. If the knob is stuck, do not try to repair it,
contact a qualified service technician or your local gas company.

To verify the proper inlet pressures, follow the following steps:

1 Turn off the gas supply at the manual gas shut off valve.

2 Remove the inlet pressure tap plug on the gas control valve (see Figure 3.29).

3 Install a 1/8 inch NPT hose connector and connect the pressure gauge tube.

4 Turn on the gas supply at the manual gas shut off valve.

5 Turn on the electrical power to the heater.

6 To light the burner, set the room thermostat to a point above room temperature.

NOTE: This heater is equipped with an ignition device, which automatically lights the burner.
This heater cannot be lighted manually. Do not try to light the burner by hand.

Verify

minimum

inlet gas supply pressure:

7 Turn on all other gas appliances that are on the same supply line. If the other gas appliances

have multiple inputs, set it to the maximum rating.

8 Observe the pressure rating on the pressure gauge.

The minimum inlet gas supply pressure for:

• Natural gas is 5.0 inches W.C.

• Propane gas is 11.0 inches W.C.

Verify

maximum

inlet gas supply pressure:

9 Turn off all other gas appliances on the same supply line.

10

Observe the pressure reading on the pressure gauge.

The maximum inlet gas supply pressure for:

• Natural gas is 14.0 inches W.C.

• Propane gas is 14.0 inches W.C.

IMPORTANT: If the inlet gas supply pressure is not within the minimum and maximum
range as shown on the rating plate, contact your gas supplier.

Removing pressure gauge from inlet port on gas valve.

Set thermostat or other control device to the lowest set point.

11

After heater has completed the post-purge cycle, turn off the electrical power to the heater.

12

Turn off the gas supply at the manual gas shut off valve.

13

Remove the pressure gauge tube and the 1/8 inch NPT hose connector.

43

3.0 Installation • Verifying Manifold Pressure

14

Replace the inlet pressure tap plug on the gas control valve.

15

Leak check the re-installed pressure tap plug using a soap solution or equivalent method

LS3 Series

as described in ANSI Z223.1 (NFPA 54).

Figure 3.29 • Gas Valve Shown in ON Position

Manifold Pressure Port

Manifold Pressure
Adjustment Screw

Inlet Pressure

Port

On/Off Switch

Verify Manifold Pressure

Before starting up the unit, smell all around the heater for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle on the floor.

When turning the gas shut off valve, only use your hand. Never use tools to turn the knobs, as it
may damage the valve resulting in a fire or explosion. If the knob is stuck, do not try to repair it,
contact a qualified service technician or your local gas company.

To verify the proper manifold pressure, follow the following steps:

1 Turn off the gas valve with the switch located on the valve body (see Figure 3.29).

2 Remove the manifold pressure tap plug on the gas control valve(see Figure 3.29).

3 Connect the pressure gauge tube and manometer.

4 Turn on the gas valve with the switch located on the valve body.

5 Turn on the electrical power to the heater.

6 To light the main burner, set the room thermostat to a point above room temperature.

NOTE: This heater is equipped with an ignition device, which automatically lights the burner.
This heater cannot be lighted manually. Do not try to light the burner by hand.

Verify manifold pressure:

7 After the unit has successfully ignited, wait five minutes prior to taking any readings. The

heater must be in a steady state of operation prior to taking a manifold pressure reading.

8 While waiting for the unit to stabilize, observe the characteristics of the flame. The flame

should be stable and should not lift from the burner. The burner color should be light blue,
and not create excessive noise.

44

LS3 Series

3.0 Installation • Prior to Leaving the Job Site

9 After five minutes, observe the pressure rating on the pressure gauge.

The target manifold gas supply pressure for:

• Natural gas is 3.5 inches W.C.

• Propane gas is 10.0 inches W.C.

NOTE: Manifold pressure of the heater is pre-set at the factory. No adjustment should be
necessary.

During the verification process, a tolerance of +/- 5% of the full scale is acceptable due to varying
atmospheric conditions.

If manifold pressure is outside of this tolerance, then an adjustment may be necessary.

Removing pressure gauge from manifold port on gas valve:

10

Set thermostat or other control device to the lowest set point.

11

After heater has completed the post-purge cycle, turn off the electrical power to the heater.

12

Turn off the gas valve with the switch located on the valve body (see Figure 3.29).

13

Remove the pressure gauge tube and the manometer.

14

Replace the manifold pressure tap plug on the gas control valve.

15

Leak check the re-installed pressure tap plug using a soap solution or equivalent method

as described in ANSI Z223.1 (NFPA 54).

Prior to leaving the Job Site

Prior to leaving the job site, verify that:

9 Service access door is properly secured to the unit.

9 The heater is clear of any objects that would interfere with the proper air circulation or that

violate the listed clearance to combustibles.

9 Manual gas shut off is ON.

9 Electrical power is ON.

9 Thermostat is set to desired temperature.

9 Properly dispose of all packaging materials.

9 Check to be sure you have all of your tools.

9 Leave the Installation, Operation, Maintenance and Parts Manual with the owner or end user.

Chart 3.10 • Manifold Pressure

Required Manifold

Type of Gas

Natural 3.5 Inches W.C. 5.0 Inches W.C. 14.0 Inches W.C.

Propane 10.0 Inches W.C. 11.0 Inches W.C. 14.0 Inches W.C.

Pressure Equivalents: 1 Inch W.C. equals .058 oz/sq. in. equals 2.49 mbar.

Pressure

45

Minimum Inlet

Pressure

Maximum Inlet

Pressure

!

3.0 Installation • High Altitude Operation

LS3 Series

High Altitude Operation

WARNING

Explosion hazard. This heater must be converted by a trained gas installation and

service personnel only. Failure to comply could result in personal injury, asphyxiation,
death, and fire or property damage.

High altitude operation of this tube heater is approved, without modification, for elevations up to 6,000 feet
(1,829 m) above MSL (sea level) in the United States. If the heater is being installed at an elevation above
6,000 ft, the input rate will have to be de-rated to ensure proper operation. The deration is achieved by a
gas orifice change. Contact the factory for installations above these elevations.

46

LS3 Series

!

!

4.0 Operation • Operating Instructions

4.0 Operation

WARNING

This appliance does not have a pilot ignition. It is equipped with an ignition device which
automatically lights the burner. Do not attempt to light the system by hand.

BEFORE OPERATING, smell all around the appliance area for gas. Be sure to smell next to the floor
because some gas is heavier than air and will settle to the floor. Refer to page 1 “If you smell gas” and on
safety label affixed to the heater.

Do not use this appliance if any part has been under water. Immediately call a qualified service
technician to inspect the appliance and to replace any part of the control system and any gas control
which has been under water.

Operating Instructions

WARNING

Use only your hand to turn the manual shutoff. Never use tools. If the
knob will not turn by hand, don’t try to repair it; call a qualified technician.
Force or attempted repair may result in a fire or explosion.

Lighting Procedures:

STOP! Read the safety information above.

1

Set the thermostat to the lowest setting.

2

Turn OFF all electrical power to the appliance.

3

Turn manual shutoff clockwise to “OFF”.

4

Wait five (5) minutes to clear out any gas. If you smell gas STOP! Follow the safety information

5

found on page 1 “If you smell gas” and on safety label affixed to the heater. If you do not smell gas,
proceed to step 6.

Turn manual shutoff knob counterclockwise to “ON”.

6

Turn ON all electrical power to the appliance.

7

Set thermostat to desired setting.

8

If the appliance will not operate, follow instructions below to turn OFF gas to the appliance and call

9

your service technician or gas supplier.

Shutdown Procedures:

Set the thermostat to the lowest setting.

1

Turn OFF all electrical power to the appliance if service is to be performed.

2

Turn manual shutoff knob clockwise to “OFF”. Do not force.

3

47

!

4.0 Operation • Sequence of Operation

LS3 Series

WARNING

This heater must be installed and serviced by trained gas installation and service
personnel only.

Do not bypass any safety features or the heater’s built in safety mechanisms will
be compromised.

Sequence of Operation

Standby: The ignition module (circuit board)continually checks for internal faults, circuit integrity and relay

contact positioning.

Starting Circuit: Upon a call for heat, the control verifies that the burner and exhaust pressure switches

are in their proper positions. The control energizes the fan. Once operational static pressure is
achieved, the burner pressure switch will close initiating the ignition sequence. The hot surface
igniter is powered and the gas valve opens after 45 seconds. If the flame is not sensed, the heater
will attempt to re-ignite for a total of 3 trials for ignition before proceeding to soft lockout.

Running Circuit: After ignition, the flame rod monitors burner flame. If sense of flame is lost, the control

closes the gas valve within one second and a new trial sequence (identical to the starting sequence)
is initiated. If flame sense is not established within 8.5 seconds, the heater will attempt two additional
ignition sequences before proceeding to soft lockout. The control can be reset by briefly interrupting
the power source.

Shut Down: When the thermostat is satisfied, the fan will enter a two (2) minute post-purge cycle.

Diagnostics

Lockout:

The controls will automatically lockout the heater system when an external or system fault occurs. There
are two types of lockout:

Soft Lockout: The heater will attempt to light three times. In the event of a failed attempt to light, (gas

pressure, valve, no flame sense etc.), the heater will enter a soft lockout period for 30
minutes and then attempt to light three more times before entering hard lockout mode.

Hard Lockout : If proof of flame is not established, a component failure occurs or blockages are evident,

the heater will enter a hard lockout. If lockout occurs, the control can be reset by briefly
interrupting the power source. Refer to Charts 4.1 & 4.2 for a description of LED codes.

Externally located operational indicator lights are provided to assist in troubleshooting of the heater. Refer
to pages 50-53 for additional troubleshooting.

48

LS3 Series

Figure 4.1 • Operational Indicator Lights

4.0 Operation • Diagnostics

HOT

NEUTRAL

120V

EARTH

- 120V HEATER INPUT -

Light 1

Indicates valve is

energized

Light 2

Indicates pressure

switches are closed

Operational Indicator Lights

Chart 4.1 • LED Diagnostic Codes - Capable Controls Board

LED CODE FAULT STATUS FAULT CODE DELAY*

Initial flash (Red) on power up Normal operation Immediate

Steady flash (Green) during Ignition Normal operation Immediate

Steady on (Green) after flame sense. Normal operation 1 minute

1 flash (Red) Ignition failure 3 minutes

2 flashes (Red) Ignitor error 12 seconds

3 flashes (Red) Gas valve error

4 flashes (Red) Line voltage frq. error

5 flashes (Red) Internal control error

6 flashes (Red) Pressure switch error

*Some LED codes have a time delay before the LED will flash.

Chart 4.2 • LED Diagnostic Codes - Fenwal Circuit Board

LED CODE FAULT STATUS FAULT CODE DELAY*

Initial flash on power up,

then steady off

Normal operation Immediate

Steady on Module failure/Internal fault Immediate

1 flash Ignition failure 32 minutes

2 flashes APS 1 failure 12 minutes

3 flashes APS 2 failure 22 minutes

4 flashes

Solenoid valve fault/Leaky
valve/Flame amplifier fault

No flash on 117V start-up Transformer fault Immediate

*Some LED codes have a time delay before the LED will flash.

49

Immediate

5.0 Maintenance • Troubleshooting Guide

5.0 Maintenance

LS3 Series

Turn on control

device for heat.

Does the draft

inducer motor

turn on?

Yes

Does the

pressure switch

indicator light

turn on?

Yes

Does the igniter

warm up and

glow red?

Pressure switch

is stuck. Replace

faulty switch.

Yes

No

No

Remove obstruction or

correct vent lengths.

No

Is the pressure

switch light on?

Is the inlet or outlet of the

heater obstructed, or is

the vent exceeding the

recommended lengths?

Is the igniter

physically

damaged?

No

Yes

No

Does the heater have 120 VAC
at the main power connection?

No

No

Replace wiring or hose

Check voltage at igniter

sequence (usually 5 to

15 seconds after call

for heat). Is it 120V?

Key

Start
Question

Find source of electrical problem.

connection to the pressure

switch. Are they acceptable?

connections.

Process
Question

Check for loose wiring or

restrictions in the hose

Is the inlet or

No

the outlet of the

unit plugged or

Corrective
Action

Yes

Yes

NoYes

No

obstructed?

Yes

Does the valve

indicator light

turn on?

Yes

Does the gas

valve turn on?

Yes

Replace igniter.

No

No

Yes

Disconnect igniter

and measure the

No

Does the gas valve turn on?

Do you see the burner in

the sight glass?

resistance. Is it

between 50-400 Ω?

No

Check inlet pressure to

the heater. Is it within the

minimum and maximum

allowable range as per the

rating plate?

Yes

Gas valve indicator

light is burned out.

Replace light.

Yes

No

Remove

obstruction.

Yes

Replace circuit board.

Correct wiring.

No

Are the wires to and from the

gas valve properly connected?

Adjust inlet pressure.

Yes

Yes

Continued on page 52

50

LS3 Series

5.0 Maintenance • Troubleshooting Guide

NOTICE

Bypassing any switch is intended for testing purposes only. Do not leave switch bypassed during normal
operation or the heater’s built-in safety mechanisms will be compromised.

Check fuse on circuit board and

internal controls transformer.

No

Is there 24

VAC across

the ‘R’ and ‘C’

terminals?

After approximately 10

seconds of operation,

is there a flash code for

Pressure Switch Failure?

Yes

No

Check for loose wiring

or restrictions in hose

connections to pressure

switch. Are the OK?

No

Repair thermostat or

thermostat wiring.

No

Is there 24

VAC across

the ‘W’ and ‘C’

terminals?

Yes

Replace pressure switch
after verifying:

• Heater, blower, and
venting are clean and
free of obstructions.

• The allowable vent
length is not exceeded.

• There is not a negative
pressure experienced
at the area of intake
(e.g., high winds, attic
space, tightly sealed
building).

circuit board.

Yes

Replace

Is the circuit board

sending 120 VAC

to the draft inducer

motor?

No

Is the pressure

switch stuck in the

closed position?

Yes

Pressure switch is

faulty.

Remove obstruction.

Yes

Yes

Is the draft inducer

impeller obstructed

or locked up?

No

The draft inducer motor is

faulty and must be replaced.

No

Replace circuit board.

Replace wiring or

hose connections.

Monitor the voltage on the gas valve

terminals during trial for ignition. Is

there 24 VAC present during the

ignition sequence?

* Refer to LED diagnostic Fault Code Chart.

Yes

*After 10-12 seconds of non-operation

has passed, is there a flash code for

APS failure (2 or 3 flashes)?

No

Yes

No

Replace circuit board.

Gas valve is faulty. Replace.

Check for flash codes on the circuit board.

Replace the ignition module.

51

Yes

Continued on page 53

5.0 Maintenance • Troubleshooting Guide

Continued from page 50

LS3 Series

Does the burner

light?

Yes

Does the burner

stay on?

Yes

Does the heater

stay on until

the call for heat

ends?

Yes

No

No

No

Is the gas supply valve

to the heater in the ‘ON’

position?

No

Do the burners light and

then shut off immediately

(within 1-2 seconds)?

Turn on gas

supply line.

Yes No

Check inlet pressure and

limit switches.

The heater can shut down due to:

• Improper grounding

• High winds.

• Taking combustion air from the attic.

• Dirty environment.

• Fluctuating gas pressure.

• Pressure switch opening.

Yes

No

Were the gas lines purged

of air?

No

Does the burner stay on

for approximately 8-10

seconds and then shut off?

Check circuit board for flash

codes. Consult factory.

Purge gas

line.

Yes

Yes

Troubleshooting ends.

For more information, contact

your local representative or the

factory for further assistance.

52

LS3 Series

5.0 Maintenance • Troubleshooting Guide

Continued from page 51

Check to make sure gas pressure is

within minimum and maximum inputs, as

indicated on the heater’s rating plate.

Is the gas pressure OK?

No

Correct problem.

Is the heater properly

grounded? Is the heater’s

polarity correct?

Yes

No

Correct problem.

With a microampmeter, check

DC amperage at flame rod. Is it

greater than .07 microamps?

No

Sensing rod is faulty or

flame is weak. Check

to make sure heater is

operating at proper gas

pressure as indicated on

heater’s rating plate and

then, if needed, replace

sensing rod.

Yes

Replace gas valve.

Replace circuit

Yes

Check to make

sure flame sensor

wire is OK and

then replace

circuit board.

board.

The heater is equipped with two safety

pressure switches. The burner switch is a

normally open switch and the exhaust switch

is a normally closed switch. Temporarily

place jumpers across the terminals of the

exhaust switch (reinstall control box cover).

Does the igniter glow red?

NOTE: If normal operation does not continue

after bypassing the exhaust switch, consult

factory to troubleshoot the burner switch prior

No

Replace the appropriate pressure switch

after verifying:

• There is continuity across the thermal fuse.

• Heater, fan blowers ,squirrel cage, intake
and exhaust are clean and free from dirt and
obstructions.

• The 4” air intake pipe does not exceed 20 ft.
and/or 2 elbows.

• There is not a negative pressure experienced
at the area of air intake (e.g.; high winds, attic
space, tightly sealed building).

to continuing.

Yes

NOTICE

Bypassing any switch is intended for testing purposes only. Do not leave switch bypassed during normal
operation or the heater’s built-in safety mechanisms will be compromised.

53

5.0 Maintenance • Heater Components and Parts List

Figure 5.1 • Burner Assembly Components

3097

3098A

70A

13

3094A

3002A

331

245

3099

70

1040, 1041

3008

3044

3023

204

331

826

85

83

84

212

76

3252

851B

3093

1325

3010

333

68B

3024

3011

3096

3012

3001B

3062, 3063

3160, 3161

214

3050

217

222

206

222A

205
3094A

3005A

9

10A

1070A

3115

221

383A

5

321

1013

LS3 Series

21B

1021

3380

14
15

17

16

3129

828

3033G

142 8

Figure 5.2 • Tube & Reflector Components

20C / D, 112

106

105

113

19B

579

21B, 220, 1077

31D

3014

3004

3020

1088, 3077, 3081, 3088, 3188

3003A

105

82, 1078

26B

3076, 3082

1077

1079

54

LS3 Series

5.0 Maintenance • Heater Components and Parts List

Chart 5.1 • Tube & Reflector Components

Part No. Description Part No. Description

TP-5 Flange Gasket T P-1021 Gasket, Igniter Cover Plate

TP-9 Conduit Coupling TP-1040 Single-Stage Gas Valve, Natural Gas

TP-10A 3/4" Conduit, 4" T P-1041 Single-Stage Gas Valve, Propane Gas

TP-13 #8 x 1/2" SMS - Drill Tip TP-1070A Burner

TP-14 Burner Sight Glass Gasket TP-1077 3" Tube Clamp

TP-15 Burner Sight Glass TP-1078 3" Reflector Center Support

TP-16 Burner Sight Glass Washer TP-10 79 3" Hanger w/ Reflector Spring

TP-17 Burner Sight Glass Kit TP-1088 4" to 3" (Belled) x 10' Titanium Stabilized Tube

TP-19B 4" Hanger w/ Reflector Spring TP-1325 Isolation Relay, 24VAC Coil

TP-20C 10’ Reflector, Aluminum TP-1428 Green Indicator Light, 24VAC

TP-20D 10’ Reflector, Stainless Steel TP-3001B Air Chamber Side Panel, Fan Mount

TP-21B 4" Tube Clamp TP-3002A Plastic End Panel, Control Compartment

TP-26B 4" x 10' Titanium Stabilized Tube TP-3003A Plastic End Panel, Fan Compartment

TP-31D Mounting Bracket (Qty. 2) TP-3004 Control Box

TP-68B Cord Grip Strain Relief Bushing TP-3005A Plastic Top Panel, Valve Compartment

TP-70 Air Chamber Gasket, 1/2" x 10-5/16" TP-3008 Gas Valve Mounting Bracket

TP-70A Manifold Gasket, 1" x 2-3/4" TP- 3010 Service Panel Hinge

TP-76 Gas Pipe Grommet TP-3011 Igniter Box

TP-82 4" Reflector Center Support TP-3 012 Igniter Box Cover

TP-83 24" CSST Flexible Gas Connector T P- 3014 4" Plastic Air Collar w/ Screen

TP-84 1/2" Female NPT to 3/4" Flare fitting TP-3020 Restrictor Plate (Indicate Size)

TP-85 1/2" Male NPT to 3/4" Flare Fitting TP-3023 Snap-in Bushing

TP-105 Reflector End Cap, Aluminum TP-3024 #8 x 1/2" SMS - Point Tip

TP-106 Reflector End Cap Clips TP-3033G Power entry plate with hole for terminal strip; Single-Stage

TP-112 5’ Reflector, Aluminum TP-3044 Manifold Pipe

TP-113 Reflector Spring TP-3050 Hot Surface Igniter

TP-204 Gas Orifice (Indicate Size) TP-3062 NC Pressure Switch Tubing

TP-205 Hot Surface Igniter Holder TP-3063 NO Pressure Switch Tubing

TP-206 Glo-Bar Holder Spring Clip TP-3076 3" x 5' Aluminized Tube w/ Baffle Dimples

TP-212 1/2" NPT Nipple, 3" TP-3077 4" to 3" (Belled) x 5' Aluminized Tube w/ Baffle Dimples

TP-214 Hot Surface Igniter Wire & Plug TP-3081 4" to 3" (Belled) x 10' Aluminized Tube w/ Baffle Dimples

TP-217 Pressure Switch Barb TP-3082 3" x 10' Aluminized Tube w/ Baffle Dimples

TP-220 4" Tube Clamp, Stainless Steel TP-3088 4" to 3" (Belled) x 10' Aluminized Tube

TP-221 Gasket, Hot Surface Igniter Holder TP-3093 #8-32 Cage Nut (Qty. 4)

TP-222 Flame Sensor TP-3094A #8-32 x 1/2" Knurled Thumb Screw (Qty. 4)

TP-222A Flame Sensor Wire TP-3096 Air Chamber Top Panel

TP-245 3/16” x 1/8” Plastic Gas Valve 90° Vent TP-3097 Burner Access Cover

TP-321 Gasket, Ignition Plate TP-3098A Air Chamber Side Panel, Pressure Switch Mount

TP-331 #8-32 Ground Screw TP-3099 Component Panel

TP-333 Power Cord w/ 3-Prong Plug, 5 foot T P-3115 Inducer Motor Assembly

TP-383A Hot Surface Igniter Plate TP- 3129 Thermostat Terminal Board; Single-Stage

TP-579 4" Hanger TP-3160 Pressure Switch Assembly (25 & 30 MBH Models)

TP-826 40VA Transformer, 120/24 TP-3161 Pressure Switch Assembly (40 & 50 MBH Models)

TP-828 Yellow Indicator Light, 24VAC TP-3188 4” to 3” (Belled) x 10’ Titan. Tube w/ Baffle Dimples

TP-851B Ignition Control Circuit Board TP-3252 Wire Harness

TP-1013 Igniter Cover Plate TP-3380 Burner Tube w/ Flange and Fittings

55

5.0 Maintenance • Routine Inspection

!

LS3 Series

WARNING

Personal injury or death may result if maintenance is not performed by properly trained
gas installer or service personnel. Contact the installing distributor or place of purchase
for service. Do not operate heating system if repairs are necessary.

Allow heater to cool prior to servicing.
Disconnect power to heater before servicing.
Use protective glasses when maintaining the heater.

Routine Inspection:

At least once per year, the heating system should be inspected and serviced by trained gas installation
and service personnel only. This inspection should be performed at the beginning of the heating season
to insure that all heater components are in proper working order and that the heating system operates
at peak performance. Particular attention should be paid to the following items.

• Clearance to Combustibles: Inspect the area near the unit to be sure there is no combustible
material located within the minimum clearance requirements listed in this manual. Under no
circumstances should combustible material be located within the clearances specified in this manual.
Failure to provide proper clearance could result in personal injury or equipment damage from fire.

• Gas Connection: Inspect the integrity of the gas connection to the heater. Check for leaks, damage,
fatigue or corrosion. Do not operate if repairs are necessary and turn off gas supply to the heater.
Contact service personnel.

To check gas tightness of the safety shut-off valves, turn off the manual valve upstream of the appliance
combination control. Remove the hex head plug on the inlet side of the combination control and connect a
manometer to that tapping.

Turn the manual valve on to apply pressure to the combination control. Note the pressure reading on the
manometer, then turn the valve off. Any loss of pressure indicates a leak. If leak is detected, use a soap
solution to check all threaded connection. If no leak is found, combination control is faulty and must be
replaced before putting appliance back in service.

• Blower Motor: Annual oiling of the blower motor with SAE oil will extend bearing life significantly.
Motors with sealed ball bearings (no oil ports) do not require oiling. Ensure that the squirrel cage in
the blower is kept clean. If dirt becomes a problem, installation of outside air intake ducts for
combustion is recommended.

Check lubrication instructions on motor. If oiling is required, add three or four drop of SAE 20 electric
motor oil.

• After three years or 25,000 hours (for light-duty operation).

• Annually after three years or 8,000 hours (for medium-duty operation).

• Annually after one year or 1,500 hours (for heavy-duty operation).

NOTICE

Never over-oil the motor, or premature failure may occur.

56

LS3 Series

• Vent pipe system: Check the outside termination and the connections at the heater. Inspect the vent
exhausts for leakage, damage, fatigue, corrosion and obstructions. If dirt becomes a problem,
installation of outside air intake ducts for combustion is recommended.

• Combustion air intake system (when applicable): Check for blockage and/or leakage. Check the
outside termination and the connection at the heater.

• Heat exchangers: Check the integrity of the heat exchangers. Replace if there are signs of structural
failure. Check for corrosion and/or buildup within the tube exchanger passageways.

• Burner: Check for proper ignition, burner flame and flame sense. Flame should extend directly
outward from burner without floating or lifting.

• Wiring: Check electrical connections for tightness and/or corrosion. Check wires for damage.

• Gas Connection: Inspect the integrity of the gas connection to the heater. Check for leaks, damage,

fatigue or corrosion. Do not operate if repairs are necessary and turn off gas supply to the heater.
Contact service personnel.

• Reflectors: To maintain effective infrared heating, always keep both sides of the reflector clean.
Maintenance can vary significantly depending on the environment. Dirt and dust can be vacuumed or
wiped with a soap and water solution. Use metal polish if the reflectors are severely dirty.

Contact service personnel if repairs are necessary. Do not operate unit.

5.0 Maintenance • Maintenance Checks & Log

Maintenance Log

Date Maintenance Performed Replacement Parts Required

57

5.0 Maintenance • Limited Warranty

LS3 Series

Limited Warranty Terms and Conditions

One-Year Limited Warranty. Radiant Tube Heaters covered in this manual, are warranted by Detroit Radiant

Products Company to the original user against defects in workmanship or materials under normal use for one year
after date of purchase. Any part which is determined to be defective in material or workmanship and returned to an
authorized service location, as Detroit Radiant Products Company designates, shipping costs prepaid, will be, as
the exclusive remedy, repaired or replaced at Detroit Radiant Products Company’s option. For limited warranty claim
procedures, see PROMPT DISPOSITION below. This limited warranty gives purchasers specific legal rights which
vary from jurisdiction to jurisdiction.

Additional Limited Warranty. In addition to the above mentioned one-year warranty, Detroit Radiant Products
Company warrants the original purchaser an additional extension on the combustion chamber, radiant tubes and
stainless steel burner. This extension excludes electrical/purchased components.

General Conditions. The Company will not be responsible for labor charges for the analysis of a defective
condition of the heater or for the installation of replacement parts. The warranties provided herein will not apply if the
input of the heater exceeds the rated input at time of manufacturing or if the heater in the judgment of the Company
has been subjected to misuse, excessive dust, improper conversion, negligence, accident, corrosive atmospheres,
excessive thermal shock, excessive vibration, physical damage to the heater, alterations by unauthorized service
personnel, operation contrary to the Company’s instructions or if the serial number has been altered, defaced, or
removed. The Company shall not be liable for any default or delay in the performance of these warranties caused
by contingency beyond its control, including war, government restriction or restraints, strikes, fire, flood, short or
reduced supply of raw materials, or parts.

Limitation of Liability. To the extent allowable under applicable law, Detroit Radiant Products Company’s liability
for consequential and incidental damages is expressly disclaimed. Detroit Radiant Products Company’s liability in
all events is limited to and shall not exceed the purchase price paid.

Warranty Disclaimer. Detroit Radiant Products Company has made a diligent effort to provide product information
and illustrate the products in this literature accurately; however, such information and illustrations are for the sole
purpose of identification, and do not express or imply a warranty that the products are merchantable, or fit for a
particular purpose, or that the products will necessarily conform to the illustrations or descriptions. Except as
provided below, no warranty or affirmation of fact, expressed or implied, other than as stated in the “LIMITED
WARRANTY” above is made or authorized by Detroit Radiant Products Company.

Product Suitability. Many jurisdictions have codes and regulations governing sales, construction, installation, and/
or use of products for certain purposes, which may vary from those in neighboring areas. While Detroit Radiant
Products Company attempts to assure that its products comply with as many codes, it cannot guarantee
compliance, and cannot be responsible for how the product is installed or used. Before purchase and use of a
product, review the product applications, and all applicable national and local codes and regulations, and be sure
that the product, installation, and use will comply with them. Certain aspects of disclaimers are not applicable to
consumer products:
e.g., (a) some jurisdictions do not allow the exclusion or limitation of incidental or consequential damages, so the
above limitation or exclusion may not apply to you: (b) also, some jurisdictions do not allow a limitation on how long
an implied warranty lasts, consequently the above limitation may not apply to you: and (c) by law, during the period
of this limited warranty, any implied warranties of implied merchantability or fitness for a particular purpose
applicable to consumer products purchased by consumers, may not be excluded or otherwise disclaimed.

Prompt Disposition. Detroit Radiant Products Company will make a good faith effort for prompt correction or other
adjustment with respect to any product which proves to be defective within limited warranty. For any product
believed to be defective within limited warranty, first write or call dealer from whom the product was purchased.
Dealer will give additional directions. If unable to resolve satisfactorily, write to Detroit Radiant Products Company at
address below, giving dealer’s name, address, date and number of dealer’s invoice, and describe the nature of the
defect. Title and risk of loss pass to buyer on delivery to common carrier. If product was damaged in transit to you,
file claim with carrier.

Registration. Register on-line at www.detroitradiant.com/warranty.

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LS3 Series

Notes

5.0 Maintenance

59

5.0 Maintenance • Kit Contents Check List

!

Kit Contents Check List

Chart 5.2 • Kit Contents for LS3 Series - Reference the length column for your model.

LS3 Series Kit Contents

LS3 Series

TP-19B 4” Hanger with

Reflector Tension Spring

TP-220 4” Stainless Steel

Tube Clamp

TP-83 24” Stainless Steel

Flexible Gas Connector

TP-106 Reflector

End Cap Clips

LS3 Series Installation,

Operation and

Maintenance Manual

TP-1079 3” Hanger with

Reflector Tension Spring

TP-1078 3” Reflector

Center Support (RCS)

TP-82 4” RCS

Part No. Description

TP-21B 4” Tube Clamp

TP-1077 3” Tube Clamp

TP-105 Reflector End Cap

LS3

10-25

TP-33B 1/2” Shut-Off Valve

(Ball Valve & Inlet Tap)

LS3

10-30

LS3

15-25

LS3

15-30

LS3

15-40

LS3

15-50

F/N: LIOLS3

LS3 Series

Installation Manual

The LS3 Series Infrared Tube Heater is a positive pressure, single-stage radiant heater system. This
manual provides specific information related to the LS3 Series model. All persons involved with the
installation, operation and maintenance of the heater system must read and understand the information
in this 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.

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 fire department.

INSTALLER: Present this manual to the end user.

Keep these instructions in a clean and dry place for future reference.

Model#: ___________________Serial #: _________________________

(located on rating label)

LS3

20-40

LS3

20-50

LIOLS3-Rev. 32513

Print: 1M-12/13 (CDS)

LS3

30-50

TP-19B 4" Hanger w/ Tension Spring 1 1 1 1 1 2 1 2 2

TP-21B 4" Tube Clamp 0 0 0 0 0 1 0 1 1

TP-33B 1/2” Shut-Off Valve & Inlet Tap 1 1 1 1 1 1 1 1 1

TP-82 4" Reflector Center Support (RCS) 0 0 0 0 0 1 0 1 1

TP-83 24" S.S. Flexible Gas Connector 1 1 1 1 1 1 1 1 1

TP-10 5 Reflector End Cap 2 2 2 2 2 2 2 2 2

TP-10 6 Reflector End Cap Clips 8 8 8 8 8 8 8 8 8

TP-220 4" Stainless Steel Tube Clamp 1 1 1 1 1 1 1 1 1

TP-1077 3" Tube Clamp 0 0 1 1 1 0 1 0 1

TP-1078 3" Reflector Center Support (RCS) 1 1 1 1 1 0 1 1 2

TP-1079 3" Hanger w/ Tension Spring 1 1 2 2 2 1 2 1 2

LIOLS3 LS3 Series Installation Manual 1 1 1 1 1 1 1 1 1

Filled By:

Approvals

• ANSI Z83.20 and CSA 2.34.

• Indoor approval.

• Certain models are residentially
Certified to CSA No. 7-89.

Limited Warranty

• 1 year - Burner box components.

• 3 years - Combustion and radiant tubes.

• 5 years - Stainless steel burner.

• See page 58 for terms and conditions.

• Outdoor approval with OD-Kit.

• Commercial approval.

© 2014 Detroit Radiant Products Co.

21400 Hoover Road • Warren, MI 48089

Phone: [phone] Fax: [phone]

Printed in U. S. A.

www.detroitradiant.com • [e-mail]

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