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Cambridge Engineering ITH Series Technical Manual

Gas-fired infrared tube heaters
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INFRARED TUBE HEATERS
TECHNICAL MANUAL
Improper installation, adjustment, alteration, service or maintenance can cause property dam-
age, injury or death. Read the installation, operating, and maintenance instructions thoroughly
before installing or servicing this equipment.
The use and storage of gasoline or other flammable vapors and liquids in open containers in
the vicinity of this appliance is hazardous.
FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. Don't touch electrical switches.
3. Extinguish any open flame.
4. Immediately call your gas supplier.
INSTALLER
Read and thoroughly understand these instructions
before attempting any installation.
ITH-SERIES
GAS-FIRED
mWARNING:
FOR YOUR SAFETY
OWNER
Retain this manual for reference.
®
ITH-TM-0412

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  • Page 1 ITH-SERIES GAS-FIRED INFRARED TUBE HEATERS TECHNICAL MANUAL mWARNING: Improper installation, adjustment, alteration, service or maintenance can cause property dam- age, injury or death. Read the installation, operating, and maintenance instructions thoroughly before installing or servicing this equipment. FOR YOUR SAFETY The use and storage of gasoline or other flammable vapors and liquids in open containers in the vicinity of this appliance is hazardous.
  • Page 2 CAUTION: FIRE OR EXPLOSION HAZARD Maintain clearance to combustible constructions as further specified in this manual. Failure to do so could result in a serious fire hazard. Heaters should not be located in hazardous atmospheres containing flammable vapors or combustible dusts. Signs should be provided in storage areas specifying maximum safe stacking height.

  • Page 3: Table Of Contents

      ................................... 32 O  AS  UPPLY     ................................ 32 URNER  OES  OT  IGHT    ................................ 32 URNER  OES  OT  TAY     ................................ 33 ROUBLESHOOTING  HART   REPLACEMENT PARTS ...............................  3 4   WARRANTY  ..................................  3 5 ITH-Series Technical Manual Page 3 Cambridge Engineering Inc.

  • Page 4: Introduction

    Introduction Established in 1963, Cambridge Engineering, Inc. is a manufacturing company with strong R&D, engineering and customer oriented problem solving capabilities. High quality, energy efficient Genuine Cambridge heaters reduce operating costs and are engineered to provide trouble-free service for years to come. Cambridge heaters are supported by factory-trained sales/service representatives.

  • Page 5: Gas Supply Lines

    Refer to the National Fuel Gas Code, ANSI Z223.1/NFPA 54 for proper location, sizing and installation of vents as well as information on clearance requirements when penetrating combustible walls for venting purposes. ITH-Series Technical Manual Page 5 Cambridge Engineering Inc.

  • Page 6: General Specifications

    120 VAC, 60 HZ, 1 Amp: 36" cord with grounded 3 prong plug Flue and Outside Air Connection 4" O.D. male connection for flue adapter and outside air (optional) provided at the heater ITH-Series Technical Manual Page 6 Cambridge Engineering Inc.

  • Page 7: Dimensional Charts

    BAND CLAMP LOCK BOLTS TO TOP, AT 10 O'CLOCK OR 2 O'CLOCK POSITION 4', 6' OR 8' COUPLING REFLECTOR 12" 10' - 4" 18" TUBE 24" U-BEND Figure 2: Component Dimensional Information ITH-Series Technical Manual Page 7 Cambridge Engineering Inc.

  • Page 8: Configurations

    50' heat exchanger with a 4' baffle at 40', and a 8' baffle at 50' (See Figure 3) BAFFLE LOCATION FOR ALL 205,000 BTU/Hr, 50 ft. UNITS ONLY (P/N CMCT095 Baffle Kit) PN CMCT026 PN CMCT027 Fold Over Fold 7'-6" 3'-6" Over Figure 3: Baffle Location ITH-205 Models ITH-Series Technical Manual Page 8 Cambridge Engineering Inc.

  • Page 9: Clearance To Combustibles

    Reduced clearances downstream from the burner are approved for all configurations. Dimensions “B”, “C”, and “D” in Table 2 can be reduced for locations 25’ or more downstream from a burner. Before the next burner, maximum reduction is 50%. ITH-Series Technical Manual Page 9 Cambridge Engineering Inc.
  • Page 10 29" 32" Unvented Above 12" 12" 18" 18" 18" 18" 18" 18" 18" 26" 26" 26" 26" 26" 32" 32" 32" 32" Vented 18" 18" 18" 18" 18" 18" 18" 18" 18" ITH-Series Technical Manual Page 10 Cambridge Engineering Inc.

  • Page 11: Installation

    2 hangers be about 8' to 9' apart. Thereafter, 10' apart on average is acceptable for the remainder of the heat exchanger. At no time should hangers be more than 12' apart, (Figure 6). ITH-Series Technical Manual Page 11 Cambridge Engineering Inc.
  • Page 12  Place the first (flanged, aluminized) tube in the first two hangers (Figure 7). Be sure the flange is toward the intended burner location. The other end of the tube should have the first coupling already loosely fitted. ITH-Series Technical Manual Page 12 Cambridge Engineering Inc.
  • Page 13  For all remaining tubes, fit the end of the tube with a coupling (Figure 8), (the coupling should be loose). Tube Coupling (loosely fitted) Heat Exchanger Tube Weld Tube Seam Facing Down Figure 8: Installation of Heat Exchanger Tube and Coupling ITH-Series Technical Manual Page 13 Cambridge Engineering Inc.
  • Page 14  Continue placing tubes, couplings and reflectors to complete the heater assembly. Ensure heat exchanger sections line up straight. Couplings should be tightened as heat exchanger is placed, since it is more difficult to do so once the reflector is in position. ITH-Series Technical Manual Page 14 Cambridge Engineering Inc.
  • Page 15 Install Baffle Vent as required in Adapter last section Bend Tab of tube over End of Tube at 6 O'clock position Figure 11: Baffle Installation ITH-Series Technical Manual Page 15 Cambridge Engineering Inc.
  • Page 16 Tube Blower shown Flange Tube with Optional Combustion Coupling Tube Air Inlet Collar Kit Burner Assembly 2" Tube & Reflector Hangers 8" Gasket Figure 12: Overall view of Tubes and Reflector Hangers ITH-Series Technical Manual Page 16 Cambridge Engineering Inc.
  • Page 17 2. Hook the Spring Clip with the Reflector Bracket and rotate over the tube. 3. Push down the Spring Clip and slide underneath the Reflector Bracket. Reflector Bracket Figure 14: Reflector Support Bracket Installation ITH-Series Technical Manual Page 17 Cambridge Engineering Inc.
  • Page 18 (Figure 15). Reflector Support Reflector Overlap Loose Approx. 6" Screws Fasten Endcap Tight with Screws Screws Loose Screws Tight Screws Figure 15: Reflector Overlap Illustration ITH-Series Technical Manual Page 18 Cambridge Engineering Inc.
  • Page 19 Figure 16: Reflector Supports Installation and Reflector Overlap  Install End Cap as shown in Figure 4 and Figure 17. Insert End Cap into Reflector and Secure it with #8 x 3/8" Screws Figure 17: Reflector End Cap Installation ITH-Series Technical Manual Page 19 Cambridge Engineering Inc.
  • Page 20  Elbows or U Tubes must be located not less than 10' from the burner in ITH-100 and smaller models, not less than 15' from the burner in ITH-125 to ITH-150, and not less than 20' from the burner in ITH-175 and larger models. ITH-Series Technical Manual Page 20 Cambridge Engineering Inc.
  • Page 21  If used, install the Mitered Reflector as shown below (Figure 19). Assemble Corner Bracket to Mitered Reflectors as shown Fasten Mitered Reflectors with 4 - #8 x 3/8" Screws Mitered Reflector Sections should overlap standard Reflectors. Figure 19: Mitered Reflector Installation ITH-Series Technical Manual Page 21 Cambridge Engineering Inc.
  • Page 22 Retainer Clip Side Reflector Side Reflector Bracket Screws to be installed from inside of Side Reflector. Install screws on one end of the Retainer Clip to allow movement. Figure 20: Side Shield Overlap ITH-Series Technical Manual Page 22 Cambridge Engineering Inc.
  • Page 23  Bottom shields need not overlap. Each 5' section is held with two support brackets (Figure 21). Tighten Screw Tubing Section #8 x 3/8" screws Support Bracket Bottom Shield Figure 21: Bottom Shield Installation ITH-Series Technical Manual Page 23 Cambridge Engineering Inc.
  • Page 24 Install End Cap as per Reflector Shield "Installation of End Cap" (Cut to fit Deco-Grille) Figure Notch Reflector Shield as required for Hangers and Reflector Supports T-Bar Shield Figure 23: Deco Grille with Suspended Ceiling Installation ITH-Series Technical Manual Page 24 Cambridge Engineering Inc.

  • Page 25: Venting / Combustion Air Ducting

     Optional outside air supply is not recommended for unvented heaters due to possible pressure imbalances in the building space.  Ensure that minimum combustible clearances are maintained for unvented heaters. Refer to Table 2 for required clearance dimensions. ITH-Series Technical Manual Page 25 Cambridge Engineering Inc.

  • Page 26: Vented Operation

    Horizontal Venting  When venting through combustible walls, use approved vent terminal Tjernlund VH1-4, or Cambridge Engineering supplied deflector vent terminal with an approved insulating thimble.  When venting through non-combustible walls, use supplied deflector vent terminal. Recommended extension of the terminal past the outside wall surface is 18" minimum.

  • Page 27: Common Horizontal Venting

    MUST TO BE USED WITH SINGLE WALL HORIZONTAL VENTING THROUGH COMBUSTIBLE WALLS. WALL THIMBLE MAY BE REPLACED BY FLASHING WHERE THE VENT IS PENETRATING A NON-COMBUSTIBLE WALL. Figure 26: Common Horizontal Venting ITH-Series Technical Manual Page 27 Cambridge Engineering Inc.

  • Page 28: Combustion Air Supply (Optional)

    Air Inlet Collar Kit To Outside Air: CMVS022 Directly to Outside or to Common Flex Duct Ductwork from Blower 12" Max. for all Flex Duct Figure 27: Installation of Outside Air as supply for Combustion ITH-Series Technical Manual Page 28 Cambridge Engineering Inc.

  • Page 29: Gas Piping

    Shut-Off Valve 3" (7.62 cm) Max. Displacement 45° 45° 90° 12" WRONG WRONG Flexible Gas Connector Air Flow Direction Heater Movement Heater Movement Heater WRONG WRONG Movement Figure 28: Flexible Gas Connections ITH-Series Technical Manual Page 29 Cambridge Engineering Inc.

  • Page 30: Electrical Wiring

    120 Vac circuit. This option only works Pink if the heater is wired with the thermostat on the 24 Vac circuit above. IGNITER BURNER Figure 29: Wiring Diagram ITH-Series Technical Manual Page 30 Cambridge Engineering Inc.

  • Page 31: Burner Operation

     Check the inside of the heat exchanger tube visually with a flashlight. If carbon or scale are present, scrape or otherwise remove deposits (a wire brush works well). ITH-Series Technical Manual Page 31 Cambridge Engineering Inc.

  • Page 32: Troubleshooting

     Check insulation on the igniter leads.  Measure flame signal current; it should be between 2 to 6 micro amps dc. Minimum 0.8 micro amps.  Clean flame rod if necessary.  Replace module if necessary. ITH-Series Technical Manual Page 32 Cambridge Engineering Inc.

  • Page 33: Troubleshooting Chart

    Troubleshooting Chart Troubleshooting Chart ITH-Series Technical Manual Page 33 Cambridge Engineering Inc.

  • Page 34: Replacement Parts

    AIR SWITCH - MODELS - 175,000 BTU CMCH007 BLOWER GASKET CMCE022 CMCE003 FLAME SENSOR ELECTRODE CMCE010 POWER CORD CMCE002 SPARK ELECTRODE CMCH001 BURNER GASKET AIR INLET COLLAR KIT (OPTIONAL) CMCE006 IGNITION WIRE CMVS022 ITH-Series Technical Manual Page 34 Cambridge Engineering Inc.

  • Page 35: Warranty

    Cambridge Engineering, Inc. 760 Long Road Crossing Drive Chesterfield, MO 63005 USA Phone: 800-899-1989;...
  • Page 36 760 Long Road Crossing Dr. Chesterfield, MO 63005 Phone: (800) 899-1989, Fax: (636) 530-6133 www.cambridge-eng.com...

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