RX Heat RX-TM-0809 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 instruction 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
RX12
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-0809
RX12
08/10/09

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Summary of Contents for RX Heat RX-TM-0809

  • Page 1 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 RX-TM-0809 RX12 08/10/09...
  • 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

    rx-Series 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: Typical 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 Collapsible Rain Hood Heater Unit (Optional) (Not shown) Air Deflector Disconnect Disconnect Switch Interface Connections Lifting Lug LP Gas Inlet Forklift Pockets Operator Operator Electrical Interface Connection Interface Panel RxHeat, LLC RX-Series Technical Manual...
  • Page 7: Accessory Options

    ACCESSORY OPTIONS Air deflector: Factory installed 12" discharge Adapter: option. Includes turning vanes. optional Air Deflector attach- Attaches to the discharge of the ments used to easily connect flex- unit. ible duct for distribution of air into the building. Handle: Factory or field installed.
  • 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 gas (LP). Refer to the Heater Rating Plate for fuel type. Failure to follow proper procedures 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 D. Connect the gas hose assembly provided with the heater between the LP cylinder(s) and the gas train. E. Turn the unit’s “Disconnect Switch” to the “oFF” position. open the access and control panel doors by using a flat head screwdriver to turn the access door lock counterclockwise until the latch has disengaged. Pull open the control panel door and disengage the access panel door latches, located on the inside top and bottom of the door.
  • Page 11 __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 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 Diagram

    WIRING & CONNECTION dIAGRAM - EdL/EdSM CONTROLS SYMBOL dESCRIPTION SYMBOL dESCRIPTION SYMBOL dESCRIPTION Air Flow Switch Flame Rod Modulating Valve Amplifier Solid State Flame Safeguard Relay (HSI) operating Thermostat (optional) Air Volume Control Fuse 24 Volt Control Remote Space Stat (optional) Burner on-oFF Switch Fuse 120 Volt Control 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 Operator Interface (Cover panel removed) (Cover panel removed) Discharge Temperature Selector Dial Air Flow Light (Green) Air Volume Control Power On Light (Green) Burner On Light (Red) Voltage Selector Switch LTC Reset Light (Amber) Disconnect Handle RxSmart Selector Switch Burner Operating Switch...
  • 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 Manual Burner Shut-off Valve 24-020 Gas Train...
  • Page 17: Replacements Parts & Service

    REPLACEMENT PARTS & SERVICE Contact the RxHeat Customer Service Group at 1-866-432-8297. MAINTENANCE INSTRUCTIONS Warning: The heater area must be kept clear and free from combustible materials, gasoline, and other flammable vapors and liquids. The flow of combustion and ventilation air must not be obstructed. Warning: Place the heater disconnect switch in the “OFF”...
  • 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 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 Operating 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 pickup ports pickup ports e) Excessive static pressure or low airflow e1) Increase motor speed using air volume control dial e2) Decrease length of ducts or bends in ducts e3) Increase exhaust by opening windows or by mechanical means f) Switch defective f) Replace switch...
  • Page 24 TROUBLESHOOTING GUIdE PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION 1. Low Flame Current ( BLOWER RUNS; µΑ a) Dirt build-up on flame rod a) Clean dirt deposit from ceramic BURNER ceramic insulator surface and install protective boot LIGHTS; b) Minimum fire set too low b) Adjust minimum fire on FLAME SAFETY modulating valve (See page 26)
  • Page 25 TROUBLESHOOTING GUIdE PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION a) Excessive manifold pressure a) If nG - adjust appliance regulator per heater nameplate a2) If LP - adjust regulator per heater nameplate - check resistance of the resistor 3. Airflow Reduced a) Blower running backwards a) Reverse motor direction b) Belts slipping b) Tighten and/or replace belts...
  • Page 26 TROUBLESHOOTING GUIdE PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION 3. Amplifier a) no output voltage to valve a) With the wire removed from terminal 3 of amplifier, replace amplifier if the valve voltage does not exceed 18 volts DC. 4. Discharge Temperature Sensor a) Short in sensor circuit a) Replace the sensor if the resis- tance measured at device exceeds...
  • 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: Rxheat, Llc

    MAINTENANCE LOG M O d E L N O . S E R I A L N O . Date Activity Technician RX-Series Technical Manual RxHeat, LLC...
  • Page 30 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 31 Cambridge Engineering 760 Long Road Crossing Dr. Chesterfield, MO 63005 Cambridge Engineering, Inc. reserves the right to change specifications, modify the design and/or substitute equivalent materials without notice as the result of code requirements, product enhance- ments, ongoing research/development and vendor changes beyond our control. Copyright ...
  • Page 32 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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