Cold Blocker CB Series

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Features

  • 19 different Btu sizes to custom design your radiant heating system
  • Factory pre-assembled for easy and low cost installation
  • Pull-through system for increased radiant efficiency and more uniform tube temperature
  • Highly efficient aluminum reflectors designed for more uniform floor level radiant energy distribution
  • Single stage or two stage modulation input

Application Videos

 

MODEL
SINGLE STAGE BTU/HR INPUT
TWO STAGE
MINIMUM MOUNTING HEIGHT
BTU/HR    HIGH INPUT
BTU/HR    LOW INPUT
LTU 40
40,000
40,000
25,000
10'
LTU 50
50,000
50,000
31,500
11'
LTU 60
60,000
60,000
38,000
12'
LTU 75
75,000
75,000
50,000
13'
LTU 80
80,000
80,000
50,000
13'
LTU 90
90,000
90,000
57,000
13'
LTU 100
100,000
100,000
63,000
13'
LTU 110
110,000
110,000
69,500
14'
LTU 120
120,000
120,000
76,000
14'
LTU 125
125,000
125,000
80,000
14'
LTU 130
130,000
130,000
82,000
14'
LTU 140
140,000
140,000
88,500
15'
LTU 150
150,000
150,000
95,000
15'
LTU 160
160,000
160,000
100,000
15'
LTU 175
175,000
175,000
110,000
15'
LTU 180
180,000
180,000
114,000
18'
LTU 200
200,000
200,000
125,000
18'
LTU 225
225,000
225,000
146,000
20'
LTU 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 LTU100-30-N5.

** 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 enrgy 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
LTU 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 (negative pressure or vacuum)

  • Pull-through system -- the products of combustion are pulled through the combustion chamber for increased radiant efficiency and greater safety
  • CSA certified for vertical or horizontal venting
  • CSA 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

Burner System

  • One piece cast iron burner with stainless steel flame retainer
  • 10 year limited warranty on burner
  • Inside or optional outside air for combustion
  • CSA certified for 50 ft. outside combustion air inlet duct
  • 4" O.D. standard fresh air inlet duct opening for LTU40-LTU75; 6" for LTU80-LTU250
  • Burner inspection sight glass
  • State-of-the-art step opening combination gas valve for quiet ignition
  • Diaphragm Air Proving Switch -- a safety device for proof of venting before gas flow and ignition
  • Spark ignition system with 100% Gas Shut-Off Safety Control (30 second pre-purge)
  • 36" Stainless Steel flexible gas connector included with control box

Radiant Emitter Tube System

  • All radiant emitter tubes are 16 gauge calorized steel -- 3" for LTU40-LTU75 and 4" for LTU80-LTU250
  • Body assembly for some models is 15' long; other models require the use of additional 5' and 10' body packages
  • Titanium alloy Alumi-Therm and aluminized steel emitter tubes are calorized for long life and high radiant efficiency
  • The calorization process (PDF) produces an emitter tube which is highly radiant absorptive on the interior and highly radiant emissive on the exterior
  • 5 year limited warranty on the emitter tube

Reflector System

  • Fully factory pre-assembled on tube body to minimize field filed 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
  • Suitable for horizontal or angle mount up to 45 degrees

Other

  • 3 Monitoring light system for on line diagnosis- power on, insufficient air flow, and ignition sytem operation
  • Uncomplicated maintenance access
  • Quick slip-on electrical connectors
  • 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.**
LTU40-30 40,000 30' 16' 10" 18 1/2" 5 1/2" 138
LTU50-30 50,000 30' 16' 10" 18 1/2" 5 1/2" 138
LTU60-30 60,000 30' 16' 10" 18 1/2" 5 1/2" 138
LTU75-30 75,000 30' 16' 10" 18 1/2" 5 1/2" 138
LTU80-30 80,000 30' 17' 6-1/2" 28" 7" 191
LTU90-30 90,000 30' 17' 6-1/2" 28" 7" 191
LTU100-30 100,000 30' 17' 6-1/2" 28" 7" 191
LTU110-30 110,000 30' 17' 6-1/2" 28" 7" 191
LTU120-30 120,000 30' 17' 6-1/2" 28" 7" 191
LTU125-30 125,000 30' 17' 6-1/2" 28" 7" 191
LTU130-30 130,000 30' 17' 6-1/2" 28" 7" 191
LTU125-40 125,000 40' 22' 6-1/2" 28" 7" 246
LTU130-40 130,000 40' 22' 6-1/2" 28" 7" 246
LTU140-40 140,000 40' 22' 6-1/2" 28" 7" 246
LTU150-40 150,000 40' 22' 6-1/2" 28" 7" 246
LTU160-40 160,000 40' 22' 6-1/2" 28" 7" 246
LTU175-40 175,000 40' 22' 6-1/2" 28" 7" 246
LTU180-50 180,000 50' 27' 7" 28" 7" 284
LTU200-50 200,000 50' 27' 7" 28" 7" 284
LTU225-50 225,000 50' 27' 7" 28" 7" 293
LTU250-50 250,000 50' 27' 7" 28" 7" 293
** Hanging weight is 80% of shipping weight      
LTU Series Heater Dimensions
GAS TYPE  BURNER PRESSURE  MINIMUM SUPPLY PRESSURE MAXIMUM SUPPLY PRESSURE VOLTAGE  AMPS  IGNITION TYPE 
LTU40-140
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
LTU150-250
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)  
LTU40 24" 6" 40" 15" 40" 12"
LTU50 24" 6" 40" 15" 40" 12"
LTU60 24" 6" 60" 15" 52" 12"
LTU75 24" 6" 60" 15" 52" 12"
LTU80 26" 6" 66" 15" 52" 12"
LTU90 26" 6" 66" 15" 52" 12"
LTU100 28" 6"  76" 15" 60" 12"
LTU110 32" 6" 82" 20" 66" 12"
LTU120 32" 6" 82" 20" 66" 12"
LTU125 32" 6" 82" 20" 66" 12"
LTU130 32" 6" 82" 20" 66" 12"
LTU140 36" 6" 87" 20" 70" 12"
LTU150 36" 6" 87" 20" 70" 12"
LTU175 42" 6" 93" 20" 77" 12"
LTU180 44" 6" 106" 20" 84" 12"
LTU200 44" 6" 106" 20" 84" 12"
LTU225 56" 6" 112" 20" 90" 18"
LTU250 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 LTU(40-75) and 18" for LTU(80-250

** 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 Instalation & 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 GCA 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
click to enlarge
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
click to enlarge
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
click to enlarge
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).