RX Heat RX15 Technical Manual

Direct gas-fired construction heater

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DIRECT GAS-FIRED
ConSTRuCTIon HEATER
TECHnICAL MAnuAL
m
GENERAL HAZARd WARNING:
Failure to comply with the precautions and
instructions provided with this heater, can
result in death, serious bodily injury and
property loss or damage from hazards of
fire, explosion, burn, asphyxiation, carbon
monoxide poisoning, and / or electrical
shock.
Only persons who can understand and fol-
low the instructions should use or service this
heater.
if you need assistance or heater information
such as an instructions manual, label, etc.
contact the manufacturer.
The use and storage of gasoline or other flammable vapors and liquids in open containers in the
vicinity of this appliance is hazardous.
This heater is designed and approved for use as a construction
heater in accordance with standard ANSI Z83.7 • CGA 2.14.
CHECK WITH YOUR LOCAL FIRE SAFETY AUTHORITY
IF YOU HAVE QUESTIONS ABOUT APPLICATIONS.
Made in the USA
Heat
RX15
FOr YOUr SaFETY:
TM
m
Warning:
Fire, burn, inhalation, and explosion
hazard. Keep solid combustibles, such as
building materials, paper, or cardboard,
a safe distance away from the heater as
recommended by the instructions. never
use the heater in spaces which do or may
contain volatile or airborne combustibles,
or products such as gasoline, solvents,
paint thinner, dust particles or unknown
chemicals.
m
Warning:
not for home or recreational vehicle use.
®
RX-TM-0909
RX15
09/11/09

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Summary of Contents for RX Heat RX15

  • Page 1 RX15 DIRECT GAS-FIRED ConSTRuCTIon HEATER TECHnICAL MAnuAL Warning: GENERAL HAZARd WARNING: Fire, burn, inhalation, and explosion Failure to comply with the precautions and hazard. Keep solid combustibles, such as instructions provided with this heater, can building materials, paper, or cardboard,...
  • Page 2: Limited Warranty

    LIMITEd WARRANTY Cambridge Engineering, Inc. (“Manufacturer”) warrants its products (“the Products”) to be free from defects in material and workmanship. Manufacturer’s Rx-Series Products shall be warranted for a period of 12 months from the date of shipment, except that burner assemblies are warranted for five years from date of shipment. Buyer’s sole and exclusive remedy for any nonconformity with this warranty shall be, at Manufacturer’s option, repair or replacement of nonconforming parts, provided that Buyer shall return to Manufacturer, shipping pre- paid, said non-c o nf o rm i ng part(s) bearing a durable tag indicating the Serial number of the Product from...
  • Page 3: Table Of Contents

    RX15 direct Gas-Fired Construction Heater Technical Manual index Page Hazard Summary ............2 Typical System Description.
  • Page 4: Hazard Summary

    HAZARd SUMMARY HAZARd IdENTIFICATION Warnings and Cautions appear at appropriate sections throughout this manual. Read these carefully. Warning: indicates a potentially hazardous situation which could result in death or serious injury. CAUTION: indicates a potentially hazardous situation which may result in minor or moderate injury.
  • Page 5: System Description

    This heater is designed for outdoor use only. It is intended for use in providing portable, temporary heat to buildings under construction, alteration or repair. Adequate ventilation must be provided while heater is operating. Combustible solids, such as building materials, paper or cardboard must be kept a minimum of 6 inches from the sides and top of the heaters, 0 inch- es from the bottom.
  • Page 6: Component Identification

    COMPONENT IdENTIFICATION unit shown with Accessory options Control Interface & Disconnect 18" Discharge Deflector Lift Eye 18" Duct Adapter Fork Pockets Duel Fuel Operator Gas Inlet Interface (NG/LP) Electrical Power Connection RxHeat, LLC RX-Series Technical Manual...
  • Page 7: Accessory Options

    ACCESSORY OPTIONS 18" discharge deflector: 18" discharge Adapter: Factory installed option. Includes optional discharge elbow attach- turning vanes. Attaches directly ments used to easily connect flex- to the discharge of the unit. ible duct for distribution of air into the building. Mat: Weight: REV NOW:...
  • Page 8: Usage Instructions

    USAGE INSTRUCTIONS Warning: These usage instructions must be followed each time heater is put into service. Warning: For safety, this heater is equipped with a manual reset high limit switch, an air-proving switch and redundant electric shut-off valves. never operate the heater with any safety device that has been bypassed. do not operate this heater unless all of these features are fully functional.
  • Page 9 Warning: This unit is designed to operate using Natural Gas or Liquid Propane (LP). Failure to follow proper procedures with Natural Gas or LP can lead to fires, explosions, personal injury or death. To ensure proper operation and prevent damage to the unit and bodily injury the following instructions must be followed.
  • Page 10 Warning: The hose assembly must be visually inspected prior to each use of the heater. if it is evident there is exces- sive abrasion or wear, or the hose is cut, it must be replaced prior to the heater being put into operation. The replacement hose assembly shall be 1”...
  • Page 11: Wiring Diagram

    __4. PREPARATION & START-UP INSTRUCTIONS A. Verify that the field wiring, both primary and control, has been installed according to the RxHeat wiring diagram, national Electrical Code, and local electrical codes. B. Ensure that the rain hood, if applicable, is locked open and the discharge accessories are securely attached. If applicable, engage the caster brakes and stop blocks.
  • Page 12 n. using the “Local/Remote” Mode RxSmart™ Switch located on the operator Interface Panel (see pg. 13), select the unit’s control system mode. o. When utilizing the “REMoTE” control system, connect the RSS to the RSS Interface using the Remote Space Sensor male connector. P.
  • Page 13 WIRING & CONNECTION dIAGRAM - EdL/EdSM CONTROLS SYMBOL dESCRIPTION SYMBOL dESCRIPTION SYMBOL dESCRIPTION Air Flow Switch Fuse 120 Volt Control Relay - Fuel Switch Amplifier Solid State High Limit Remote Space Stat Air Volume Control Ignitor Shut-off Valve - Gas Burner on-oFF Switch Power Safety shut-off Valve - Gas...
  • Page 14: Supply Pressure Requirements

    SUPPLY PRESSURE REQUIREMENTS GAS SUPPLY PRESSURE NATURAL LIQUId REQUIREMENTS TABLE PROPANE Minimum gas supply pressure 20" wc 5 PSI for maximum input adjustment (50 mbar) (.35 bar) Minimum gas supply pressure 1.0" wc 1.0" wc to maintain flame signal (2.5 mbar) (2.5 mbar) Maximum gas supply pressure 10 PSI...
  • Page 15: Electrical Components

    ELECTRICAL COMPONENTS Operator Interface Panel (Panel cover removed) Discharge Temperature Selector Dial Nat. Gas Select Button RSS Interface On (Lighted) Air Volume Control Burner On OT Interface Light (Red) Disconnect 11 LTC Reset Light Handle (Amber) 13b RxSmart Selector Power On Switch Light (Green) Burner Operating...
  • Page 16: Component Parts List

    COMPONENT PARTS LIST RX15 Component Parts List Item Location (Manual Page) Description Part Number Gas Train Valve - Gas Modulating M611 24-033 Gas Train Valve - Gas Shut Off 21-118 Gas Train Regulator - Appliance lbs. to inches 24-008 Gas Train...
  • Page 17: Maintenance Instructions

    The heater should be inspected before each use, and at least annually by a qualified service technician. BLOWER BEARING LUBRICATION “ ” “ The RX15 model heaters require lubrication on intervals of 3 to 6 months. use Shell Alvania #2 Exxon unirox ” “...
  • Page 18: Burner Cleaning

    ELECTRIC SHUT-OFF VALVE LEAK CHECK Warning: The heater shall be periodically evaluated, at least annually, for the seal tightness of the electric shut-off valves. The heater is equipped with a leak test facility to assist in checking these seals. A momentary switch and a gas port for measuring pressure between valves are provided as the leak test hardware.
  • Page 19 CAUTION: igniter is made of silicon carbide material and should be handled with care to avoid breakage. C. Disconnect the ignition cable from the burner and then remove the flame rod. D. Examine the flame rod ceramic for cracks and replace if necessary. Clean dirt/grime build-up from the insulator.
  • Page 20 ASCO Gas Valves: Series 8214 Disassemble valve and clean all parts as follows: IMPORTANT: If parts are worn or damaged, install a complete ASCo Rebuild Kit. A. Remove the solenoid enclosure. B. Remove the bonnet screws, valve bonnet, bonnet gasket, core/diaphragm sub-assembly and body gasket. C.
  • Page 21: Disassembled View Of Asco Valve

    disassembled View of ASCO Valve RX-Series Technical Manual RxHeat, LLC...
  • Page 22: Troubleshooting Guide

    TROUBLESHOOTING GUIdE PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION NO BLOWER 1. Heater Disconnect OPERATION a) Disconnect in “oFF” position a) Turn disconnect “on” 2. Blower ON-OFF Switch a) Switch in oFF position a) Place switch in the “on” position b) Defective switch b) Replace switch 3.
  • Page 23 TROUBLESHOOTING GUIdE PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION bends in ducts e3) Increase exhaust by opening windows or by mechanical means f) Switch defective f) Replace switch 3. Flame Safeguard Relay (FSR) a) no input voltage a) Check wiring b) Defective FSR b) Replace FSR BLOWER RUNS;...
  • Page 24 TROUBLESHOOTING GUIdE PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION d) Burner defective d) Replace burner 2. No Flame Current a) Ground connection open a1) Reference T1 transformer to ground a2) Tighten loose ground screws b) Flame rod wire termination oxidized b) Clean terminal and reinsert c) Flame rod defective c) Replace flame rod 3.
  • Page 25 TROUBLESHOOTING GUIdE PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION 3. Airflow Reduced a) Blower running backwards a) Reverse motor direction b) Belts slipping b) Tighten and/or replace belts c) Blocked intake or discharge c) Find and remove obstruction 4. Temperature Control System a) Temperature control system does not a) See problem VII modulate...
  • Page 26 TROUBLESHOOTING GUIdE PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION 4. Discharge Temperature Sensor a) Short in sensor circuit a) Replace the sensor if the resis- tance measured at device exceeds 24,000Ω or is less than 7,000Ω. ERRATIC OR 1. Amplifier PULSATING a) Hunting a1) Adjust sensitivity control dial FLAME counter-clockwise...
  • Page 27: Minimum Fire Adjustment Procedure

    MINIMUM FIRE AdJUSTMENT PROCEdURE The minimum fire setting is preset at the factory at approximately 25˚F rise for NG and approximately 40˚F rise for LP. If an adjustment is necessary, a DC microammeter is required to monitor flame signal during the adjustment procedure to ensure the flame current remains steady and of sufficient strength to maintain burner operation for both consistent ignition at minimum fire and locking in the flame safeguard relay.
  • Page 28: Maintenance Log

    MAINTENANCE LOG M O d E L N O . S E R I A L N O . Date Activity Technician RxHeat, LLC RX-Series Technical Manual...
  • Page 29 Cambridge Engineering 760 Long Road Crossing Dr. Chesterfield, MO 63005 RX-Series heaters are manufactured by Cambridge Engineering, Inc. which reserves the right to change specifica- tions, modify the design and/or substitute equivalent materials without notice as the result of code requirements, product enhancements, ongoing research/development and vendor changes beyond our control.
  • Page 30 Heat 760 Long Road Crossing Dr. Chesterfield, MO 63005 Ph: 877-HEAT-BY-RX (87 7- 4 32- 82 97) Fax: (636) 898-3438 www.RxHeat.com...

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