LTU Series

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Features

  • 19 different Btu sizes and more than 100 different configurations to custom design your radiant heating system
  • Factory pre-assembled for easy and low-cost installation
  • Pull-through system for increased radiant efficiency
  • Calorized aluminized steel emitter tubes and highly efficient aluminum reflectors to enhance radiant output
  • Single stage or two stage modulating input.
MODEL SINGLE STAGE BTU/HR INPUT TWO STAGE MINIMUM MOUNTING HEIGHT
BTU/HR   HIGH INPUT BTU/HR   LOW INPUT
LTS 40
40,000 40,000 25,000 10'
LTS 50
50,000 50,000 31,500 11'
LTS 60
60,000 60,000 38,000 12'
LTS 75
75,000 75,000 50,000 13'
LTS 80
80,000 80,000 50,000 13'
LTS 90
90,000 90,000 57,000 13'
LTS 100
100,000 100,000 63,000 14'
LTS 110
110,000 110,000 69,500 14'
LTS 120
120,000 120,000 76,000 14'
LTS 125
125,000 125,000 80,000 14'
LTS 130
130,000 130,000 82,000 15'
LTS 140
140,000 140,000 88,500 15'
LTS 150
150,000 150,000 95,000 15'
LTS 160
160,000 160,000 100,000 16'
LTS 175
175,000 175,000 110,000 16'
LTS 180
180,000 180,000 114,000 18'
LTS 200
200,000 200,000 125,000 18'
LTS 225
225,000 225,000 146,000 20'
LTS 250 
250,000 250,000 162,000 20'

* Indicate model number based on Btu/hr input (e.g. 100,000 Btu/hr), emitter length (e.g. 30 ft.) . Control suffix (e.g. Natural Gas single stage input ) . The unit selection would be LTS100-30-N5. See Dimensions Tab for all allowable Emitter Tube Lengths.

** Minimum recommended mounting heights are intended as a guide only, as heaters may be mounted at various heights and angles. Mount heaters as high as possible. Minimums are shown as a guideline for human comfort and uniform energy distribution for complete building applications. Please consult your Space-Ray Representative for a detailed analysis of your particular heating requirements.

Control Suffix Type of Gas Control Option Description
N5/ L5 Natural / Propane Single Stage Gas Valve- Single Stage Input
N7 / L7 Natural / Propane Two Stage Gas Valve- Modulating Input – High/Low Fire
LTS Series Floor Level Coverage Charts

Floor Level Coverage - The above chart may be used as a guideline for primary radiation, i.e. the infrared pattern directly below the heater. In a well-insulated building, only 50% of the floor needs to be covered by the primary radiant pattern. Please be aware that the radiant energy generated by infrared heaters is not limited to the primary radiant pattern. There is additional radiant energy that is absorbed outside the primary area, a secondary radiant pattern. Since concrete is a very good conductor of heat, a reasonably uniform floor temperature eventually will be reached. The amount of time it takes to reach "thermal equilibrium" is in direct correlation to the distance between the heaters. Learn More >>

Pull-Through System

  • Pull-through system -- the products of combustion are pulled through the combustion chamber for increased radiant efficiency and greater safety
  • CSA design certified for vertical or horizontal venting
  • CSA design certified for maximum 75 ft. horizontal sidewall venting
  • 4" O.D. flue connection for LTU40-LTU175; 6" for LTU180-LTU250
  • Draft inducer is equipped with permanently lubricated, totally enclosed, fan cooled and heavy duty ball bearing motor for maintenance-free operation
  • Draft inducer assembly can be used for through-the-roof venting or rotated 45 degrees or 90 degrees for horizontal venting
  • No draft hoods, totally enclosed combustion chamber
  • CSA design certified for vented or indirect vented operation.

Burner & Control Systems

  • 3 Monitoring light system for on line diagnosis- power on, insufficient air flow, and ignition sytem operation
  • Monitoring light system for on-line diagnosis
  • One-piece cast iron burner with stainless steel flame retainer
  • 10 year limited warranty on burner
  • Inside or optional outside air for combustion
  • CSA design certified for 50 ft. fresh air inlet duct
  • 4" or 6" O.D. standard fresh air inlet duct opening for LTS40 - LTS75; 6" for LTS80 - LTS250
  • Burner inspection sight glass
  • State-of-the-art redundant, step opening, combination gas valve for quiet ignition and added safety
  • Diaphragm Air Proving Switch--a safety device for proof of venting before gas flow and ignition
  • Direct Spark ignition system with 100% Gas Shut-Off Safety Control (30 second pre-purge)
  • Quick slip-on electrical connectors and quick 115-volt terminal block connection
  • Uncomplicated maintenance access
  • 36" Stainless Steel flexible gas connector included with control box

Radiant Emitter Tube System

  • All radiant emitter tubes are 16 gauge, 4" O.D. calorized steel
  • Body assembly consists of 5' and 10' body sections that can be assembled in desired configuration (elbows and corner reflectors are optional)
  • Titanium alloy Alumi-Therm and aluminized steel emitter tubes are calorized for long life and high radiant efficiency -- will not flake or peel, and are corrosion resistant
  • The calorization process (PDF) produces an emitter tube which is highly radiant absorptive on the interior and highly radiant emissive on the exterior
  • Suitable for horizontal or angle mount up to 45 degrees
  • CSA design certified for incline mounting up to 2/12 pitch roof structure
  • 5 year limited warranty on the emitter tube

Reflector System

  • Fully factory pre-assembled on tube body to minimize field assembly and save installation labor cost
  • Highly efficient aluminum reflectors with reflectivity rating of 97%
  • Reflector ends are enclosed for maximum radiant heat output and minimum convection loss
  • Easy-to-use mounting brackets

Other

  • Quick 115 volt terminal block connection
  • 1/2" MPT gas inlet connection
  • CSA approved for direct vented or indirect vented operation
  • Optional deflector kit for reduced clearances to combustible materials
  • Optional decorative grille kit for drop ceiling applications
  • Optional side reflector kits
  • CSA Certified according to ANSI Z83.20 and CSA 2.34. NOT Certified for Residential Use
MODEL INPUT BTU/HR TOTAL TUBE LENGTH (FT) OVERALL
DIMENSION "L" (FT)
REFLECTOR
WIDTH "W" (IN)
REFLECTOR
HEIGHT "H" (IN)
SHIPPING
WEIGHT
Lbs.**
LTS40-15 40,000 15' 17' 9" 13" 6" 108
LTS50-15 50,000 15' 17' 9" 13" 6" 108
LTS40-20 40,000 20' 22' 9" 13" 6" 128
LTS50-20 50,000 20' 22' 9" 13" 6" 128
LTS60-20 60,000 20' 22' 9" 13" 6" 128
LTS75-20 75,000 20' 22' 9" 13" 6" 128
LTS50-25 50,000 25' 27' 9" 13" 6" 158
LTS60-25 60,000 25' 27' 9" 13" 6" 158
LTS75-25 75,000 25' 27' 9" 13" 6" 158
LTS50-30 50,000 30' 32' 9" 13" 6" 185
LTS60-30 60,000 30' 32' 9" 13" 6" 185
LTS75-30 75,000 30' 32' 9" 13" 6" 185
LTS80-30 80,000 30' 32' 9" 13" 6" 185
LTS90-30 90,000 30' 32' 9" 13" 6" 185
LTS100-30 100,000 30' 32' 9" 13" 6" 185
LTS110-30 110,000 30' 32' 9" 13" 6" 185
LTS120-30 120,000 30' 32' 9" 13" 6" 185
LTS125-30 125,000 30' 32' 9" 13" 6" 185
LTS130-30 130,000 30' 32' 9" 13" 6" 185
LTS80-35 80,000 35' 37' 9" 13" 6" 215
LTS90-35 90,000 35' 37' 9" 13" 6" 215
LTS100-35 100,000 35' 37' 9" 13" 6" 215
LTS110-35 110,000 35' 37' 9" 13" 6" 215
LTS120-35 120,000 35' 37' 9" 13" 6" 215
LTS125-35 125,000 35' 37' 9" 13" 6" 215
LTS130-35 130,000 35' 37' 9" 13" 6" 215
LTS80-40 80,000 40' 42' 9" 13" 6" 235
LTS90-40 90,000 40' 42' 9" 13" 6" 235
LTS100-40 100,000 40' 42' 9" 13" 6" 235
LTS110-40 110,000 40' 42' 9" 13" 6" 235
LTS120-40 120,000 40' 42' 9" 13" 6" 235
LTS125-40 125,000 40' 42' 9" 13" 6" 235
LTS130-40 130,000 40' 42' 9" 13" 6" 235
LTS140-40 140,000 40' 42' 9" 13" 6" 235
LTS150-40 150,000 40' 42' 9" 13" 6" 235
LTS160-40 160,000 40' 42' 9" 13" 6" 235
LTS175-40 175,000 40' 42' 9" 13" 6" 235
LTS125-45 125,000 45' 47' 9" 13" 6" 265
LTS130-45 130,000 45' 47' 9" 13" 6" 265
LTS140-45 140,000 45' 47' 9" 13" 6" 265
LTS150-45 150,000 45' 47' 9" 13" 6" 265
LTS160-45 160,000 45' 47' 9" 13" 6" 265
LTS175-45 175,000 45' 47' 9" 13" 6" 265
LTS125-50 125,000 50' 52' 9" 13" 6" 285
LTS130-50 130,000 50' 52' 9" 13" 6" 285
LTS140-50 140,000 50' 52' 9" 13" 6" 285
LTS150-50 150,000 50' 52' 9" 13" 6" 285
LTS160-50 160,000 50' 52' 9" 13" 6" 285
LTS175-50 175,000 50' 52' 9" 13" 6" 285
LTS180-50 180,000 50' 52' 9" 13" 6" 285
LTS200-50 200,000 50' 52' 9" 13" 6" 285
LTS225-50 225,000 50' 52' 9" 13" 6" 335
LTS250-50* 250,000 50' 52' 9" 13" 6" 285
LTS180-60 180,000 60' 62' 9" 13" 6" 335
LTS200-60 200,000 60' 62' 9" 13" 6" 335
LTS225-60 225,000 60' 62' 9" 13" 6" 335
LTS250-60 250,000 60' 62' 9" 13" 6" 335
LTS180-70 180,000 70' 72' 9" 13" 6" 385
LTS200-70 200,000 70' 72' 9" 13" 6" 385
LTS225-70 225,000 70' 72' 9" 13" 6" 385
LTS250-70 250,000 70' 72' 9" 13" 6" 385
LTS180-80 180,000 80' 82' 9" 13" 6" 435
LTS200-80 200,000 80' 82' 9" 13" 6" 435
LTS225-80 225,000 80' 82' 9" 13" 6" 435
* Unvented use ** Hanging weight is 80% of shipping weight
LTS Series Dimensions
GAS TYPE  BURNER PRESSURE  MINIMUM SUPPLY PRESSURE MAXIMUM SUPPLY PRESSURE VOLTAGE  AMPS  IGNITION TYPE 
LTS40-160
NATURAL 3.5" W.C. 5" W.C. 14" W.C. 120 VAC 2.6 DIRECT SPARK
PROPANE 10" W.C. 11" W.C. 14" W.C. 60 HZ
LTS150-250
NATURAL 3.5" W.C. 7" W.C. 14" W.C. 120 VAC 2.6 DIRECT SPARK
PROPANE 10" W.C. 12" W.C. 14" W.C. 60 HZ

NOTE: For all installations higher than 2000 ft. above sea level please consult the factory regarding recommended derating of heaters.

Clearances to Combustables
MODEL  SIDE  CEILING* BELOW  ENDS  FRONT  REAR(45° angle)  
LTS40 24" 6" 40" 15" 40" 12"
LTS50 24" 6" 40" 15" 40" 12"
LTS60 24" 6" 60" 15" 52" 12"
LTS75 24" 6" 60" 15" 52" 12"
LTS80 26" 6" 66" 15" 52" 12"
LTS90 26" 6" 66" 15" 52" 12"
LTS100 28" 6"  76" 15" 60" 12"
LTS110 32" 6" 82" 20" 66" 12"
LTS120 32" 6" 82" 20" 66" 12"
LTS125 32" 6" 82" 20" 66" 12"
LTS130 32" 6" 82" 20" 66" 12"
LTS140 36" 6" 87" 20" 70" 12"
LTS150 36" 6" 87" 20" 70" 12"
LTS160 42" 6" 93" 20" 77" 12"
LTS175 42" 6" 93" 20" 77" 12"
LTS180 44" 6" 106" 20" 84" 12"
LTS200 44" 6" 106" 20" 84" 12"
LTS225 56" 6" 112" 20" 90" 18"
LTS250 56" 6" 112" 20" 90" 18"

NOTE: The clearances specified above must be maintained to combustibles and other materials that may be damaged by temperatures 90°F above ambient temperature. Clearances to combustibles are posted on the reflector near the control end of the heater. In locations used for storage of combustible materials where they may be stacked below the heater, NFPA 54 requires that the installer must post signs that will "specify the maximum permissible stacking height to maintain the required clearances from the heater to combustibles".

* When used indirect vented, clearance to CEILING must be: 12" for LTS(40-75) and 18" for LTS(80-250).  If optional corner and u-bend reflectors are not used, the clearance must be 18".  

** Maximum clearance below reduces by 50% once you are 25ft. downstream from the burner box. Note: Consult Factory if reduced clearances are required

VENTING REQUIREMENTS

Heaters can be common vented, vented or indirect vented. A vented installation must be vented outside the building with a flue pipe. An indirect vented installation requires a minimum ventilation flow of 4 CFM per 1000 BTU/hour of total installed heater capacity on natural gas by either gravity or power ventilation (4.18 CFM per 1000 BTU/hour on propane).

INSTALLATION REQUIREMENTS

Installation and service must be performed by a licensed contractor. The installation must conform to written Installation & Operating Instructions and local codes. In the absence of local codes, the installation must conform with the National Fuel Gas code, ANSI Z223.1 (latest edition also known as NFPA54) or CSA B149 (latest edition) installation codes. These codes are available from the National Fire Protection Association, Inc., Batterymarch Park, Quincy, MA 02269 or the Canadian Gas Association, 55 Scarsdale Road, Toronto, Ontario M3B 2R3, CANADA.

FOR YOUR SAFETY

Operate infrared heaters with proper care and observe all safety precautions. Carefully follow printed installation, operating and cleaning instructions furnished with the heater. Do not store gasoline or combustible products in the vicinity of the heater. Do not touch the heater or the tubes while the heater is in operation. Adequate ventilation must always be provided in accordance with codes.
Deflector Kit

The Deflector Kit (Part # 43482000) is used to reduce clearances to combustibles below the heater. Details on Deflector Kit (PDF)

Deflector Kit for Infrared Heater
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Side Reflector Kits

Side Reflector kits can be used to reduce the clearences to combustibles to the side of the heater. They are available as single side reflector or 2-side reflector. Side Reflector Installation info (PDF)

Side Reflector Kits
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Decorative Grille Kits

The heaters can be installed over non-combustible suspended ceilings with the use of aluminum decorative grilles. Decorative Grille Installation Instructions (PDF)

Decorative Grille Kits
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90 Degree Elbow Package Kit

Heaters can be installed in various configurations- L Shape, Z Shape etc. using 90 degree elbows. See I & O's for typical layouts. 90 Degree Elbow Accessory Package Kit (Part #43208010) comes with the required couplings and hardware. LTS Series Only

90 Degree Elbow Package Kit
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Corner Reflector Package Kit

Heaters can be installed in various configurations- L Shape, Z Shape etc. using 90 degree elbows. See I & O's for typical layouts. 90 Degree Elbow Accessory Package Kit (Part #43208010) comes with the required couplings and hardware. LTS Series Only

Corner Reflector Package Kit
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Tube Heater Accessories

Accessories for common tube heater installations include vent caps, combustion air termination caps, thermostats, programmable digital thermostats, 24V Thermostats relay kits, Thermostat enclosure, Chain Kits, Second Stage Line Regulators, and manual cutoff valves. To learn more click Tube Heater Accessories (PDF).