FOR YOUR SAFETY If you smell gas: 1. Open windows. 2. DO NOT try to light any appliance. 3. DO NOT use electrical switches. 4. DO NOT use any telephone in your building. 5. Leave the building. 6. Immediately call your local gas supplier after leaving the building. Follow the gas suppliers instructions. 7. If you cannot reach your gas supplier, call the Fire Department.
TABLE OF CONTENTS SECTION 1: Heater Safety...................................................... 1 1.1 Manpower Requirements ............................................. 1 SECTION 2: Installer Responsibility ..................................... 2 2.1 Wall Tag ....................................................................... 2 2.2 Corrosive Chemicals.................................................... 2 2.3 National Standards and Applicable Codes ..................
TABLE OF FIGURES Figure 1: Installation Clearances and Clearances to Combustibles......................................................... 4 Figure 2: Suspension Methods ................................................. 7 Figure 3: Shelf Mounting and Hanging Suspension.................. 8 Figure 4: Vertical Louvers (Optional)......................................... 9 Figure 5: Vent and Roof Detail ................................................
SECTION 1: HEATER SAFETY SECTION 1: HEATER SAFETY Your Safety is Important to Us! This symbol is used throughout the manual to notify you of possible fire, electrical or burn hazards. Please pay special attention when reading and following the warnings in these sections. Installation, Service and Annual Inspection of heater must be done by a contractor qualified in the installation and service of gas-fired heating equipment.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 2: INSTALLER RESPONSIBILITY The installer is responsible for the following: • To install the heater, as well as the gas and electrical supplies, in accordance with applicable specifications and codes. Roberts-Gordon recommends the installer contact a Local Building Inspector or Fire Marshal for guidance.
SECTION 3: CRITICAL CONSIDERATIONS SECTION 3: CRITICAL CONSIDERATIONS 3.1 Basic Information UH (A) (AS) heaters have automatic ignition burners for ON/OFF operation only. 3.2 Location and Suspension All models: • Must be installed indoors. • Must be installed in a level position with horizontal discharge. • May be mounted on a shelf of non-combustible material using shelf mounting brackets.(See Page 7, Figure 2 and Page 8, Figure 3 for details.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL WARNING Fire Hazard Some objects will catch fire or explode when placed close to heater. Keep all flammable objects, liquids and vapors the required clearances to combustibles away from heater. Failure to follow these instructions can result in death, injury or property damage.
SECTION 4: NATIONAL STANDARDS AND APPLICABLE CODES SECTION 4: NATIONAL STANDARDS AND APPLICABLE CODES 4.1 Gas Codes The type of gas appearing on the nameplate must be the type of gas used. Installation must comply with national and local codes and requirements of the local gas company. United States: Refer to National Fuel Gas Code, ANSI Z223.1 - latest revision (same as NFPA 54). Canada: Refer to CAN/CGA B149.1 and B149.2: Installation Codes for Gas Burning Appliances. 4.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 5: MAJOR COMPONENTS 5.1 General Heaters are designed for installation above 6' (1.8 m). These heaters must be installed within the heated space. Duct delivery systems are not permitted with axial fan units. When handling or supporting the heater from below, ensure that the weight is taken at the support points. 5.2 Shelf Mounting and Suspension WARNING Crush Hazard Use 3/8" threaded rod minimum.
SECTION 5: MAJOR COMPONENTS Figure 2: Suspension Methods Unistrut Channel Nut Ensure all suspension hardware is torqued to a minimum of 20 ft lbs. Washer Nut 3/8" Threaded Rod Cone Point Set Pin Window Clamp 3/8" Threaded Rod Unistrut Nut Washer Riv Nut Shelf Mounting Brackets Support Points Description Shelf Mounting Bracket Kit Shelf Mounting Bracket Screw #10 x 1/2" Type AB Phil HWH Z Part Number 12011000K 11111510 Qty. 94311008 2 2 Existing cabinet screws must be re-used.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 3: Shelf Mounting and Hanging Suspension Shelf Mounting Hanging Shelf Mounting Brackets (Fasten to Wall Mounting Bracket) Wall Mounting Bracket Arm (Right & Left) 3/8" Fasteners 5/16" x 3 1/2" Bolt 5/16" Flat Washer 5/16" Locknut with Nylon Insert Torque to 40 in lb (4.5 Nm).
SECTION 5: MAJOR COMPONENTS Figure 4: Vertical Louvers (Optional) Remove Horizontal Louvres Install Vertical Louvre Brackets (top and bottom) with supplied screws.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 6: VENTING 6.1 Changing Vent and Air Intake Orientation The heater is sold with rear horizontal vent and air intake connections as standard (only separated combustion models have air intake connection). If vertical vent and air intake connections are required, follow the instructions on Page 38, Section 14.4. 6.
SECTION 6: VENTING 6.3.1 Standard Vented Heaters (Models UHA 30 - 125) The vent must be fitted with a low resistance terminal. See Page 12, Figure 5 through Page 13, Figure 6. Standard vented heaters do not allow outdoor air intake for combustion air. 6.3.2 Separated Combustion Heaters (Models UHAS 30 - 125) The heaters are designed to be installed as separated combustion heaters. The vent and air intake are run as separate pipes to the wall or roof terminals. See Page 15, Figure 10.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Where local codes permit, a single section of type B-1 vent material may be used at the roof or wall penetration instead of a thimble. Ensure vent manufacturer's clearance from vent material is maintained. Seal annular space of the type B-1 vent as well as all joints in the remaining vent. corrected by a contractor qualified in the installation and service of gas-fired equipment or your local gas supplier.
SECTION 6: VENTING Figure 6: Standard Vented Heater - Vertical and Horizontal Vent Termination Vent Terminal Flashing (By Others) Listed Thimble (2" Clearance) 4" Dia.Vent Listed Thimble (2" Clearance) Vertical Option Horizontal Option Flashing (By Others) Vent Vent Terminal Condensate Trap to Drain (Optional) Model UHA 30 - 125 Vent Diameter 4" (10 cm) 12" (31 cm) Minimum Note: Vent supports not shown.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 8: Separated Combustion Heater - Vertical and Horizontal Vent Termination 12" (31 cm) Minimum from air inlet to vent termination (may be horizontal or vertical clearance). 4" Dia. Vent 4" Dia. Air Intake Listed Thimble through Combustible Wall 4" Dia. Vent Horizontal Option Vertical Option 12" (31 cm) Minimum from wall to vent termination. Vent Termination Air Intake Termination 4" Dia.
SECTION 6: VENTING Figure 10: Concentric Vertical and Horizontal Vent Termination - Separated Combustion Heater 4" Type B-1 Vent 6" Dia. Single Wall Vent Terminal with Baffle Plate Storm Collar (By Others) (Attach with 3 sheet metal screws.) Combustion Air Terminal Flashing (By Others) Concentric Vent Box 4" Dia. Air Intake Vertical Option 10' (3 m) Maximum 4" Dia. Vent Condensate Trap to Drain (Optional) 4" Dia. Vent Horizontal Option 4" Dia.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 7: AIR SUPPLY 7.1 Separated Combustion Installation When installed as a separated combustion heater, the air for combustion is drawn in from outside the building. It is important to ensure that there is adequate space around heater to provide air for the axial air distribution fan. 7.
SECTION 8: GAS PIPING SECTION 8: GAS PIPING WARNING Fire Hazard Hazard Fire Connect to to Figure 11. 10. Connectgas gassupply supplyaccording according Figure Gas properly. Gascan canleak leakififnot notinstalled installed properly. Failure Failureto tofollow followthese theseinstructions instructionscan canresult resultinindeath, death, injury injuryor orporperty propertydamage. damage. It is important that the gas supply pipe and the electrical connections do not support any of the heater’s weight.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 9: WIRING codes in accordance with: United States: refer to National Electrical Code® ANSI/NFPA 70 - latest revision Canada: refer to Canadian Electrical Code CSA C22.1 Part I - latest revision. WARNING Electrical Shock Hazard Disconnect electrical power and gas supply before servicing. This appliance must be connected to a properly grounded electrical source.
SECTION 9: WIRING 9.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 9.
SECTION 9: WIRING 9.5 Electrical Connection to the Heater Flexible Conduit BX Connector Burner Connect wires together with suitable approved wire connectors. L1 L2 Ground Green to Ground White to L2 Black to L1 Black White Green Junction Box Note: Junction box is not provided with heater. Conduit can also be attached directly to heater with wire junction made within the heater cabinet.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 10: OPERATION AND MAINTENENCE Installation, service, and annual inspection of the heater must be done by a contractor qualified in the installation and service of gas-fired heating equipment. Read this manual carefully before installation, operation, or service of this equipment. All components are accessed via the door secured by 4 sheet metal screws. Opening the door exposes live electrical connections and hot components.
SECTION 10: OPERATION AND MAINTENENCE Figure 12: Automatic Burner Control Sequence Burner sequence for Ignition Control RUN START SHUT DOWN Thermostat 24 V Flue Fan Pressure Switch P C 30 Sec. Purge* NO NC 30 Sec. Post Purge ts = 10 seconds Ignition Spark Start Gas Valve Flame Signal Axial Fan 30 Sec. Delay 90 Sec. Delay *Purge time begins at pressure switch change over. Required Incoming Signals Signals Output By Control If at any stage the flame fails, the control will retry for ignition.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 14: Gas Valve for Models UH (A) (AS) 60 - 125 Regulator END VIEW Outlet Pressure Gas Inlet Inlet Pressure 10.2.2 Start-Up the Gas Valve (All Gases) 10.2.2.1 Check Burner Gas Pressure 1. Remove the plug in the outlet (burner) pressure test point and connect a pressure tap and a manometer. 2. With the burner firing, measure the pressure on the manometer.
SECTION 10: OPERATION AND MAINTENENCE switch for turning off heater for service or during off-season. 10.2.5 External Controls External controls may include time switch, interlock switch, room thermostat and frost thermostat. Operate each control to ensure that they function correctly. Set the switches (if fitted) and thermostat(s) to the users’ requirements. 10.3 Complete the Start-Up Ensure that all covers are fitted correctly and all test points are properly sealed. 10.3.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 11: USER INSTRUCTIONS 11.1 User Instructions The UH (A) (AS) Series heaters are fully automatic and operate from the external controls fitted on site. The only user control at the heater is the Manual Reset Limit Switch - See Page 26, Section 11.3.1 WARNING Figure 15: Manual Reset Limit Switch Reset Button To reset manual reset limit switch, press reset button. NOTE: To reset, the switch must be cool.
SECTION 11: USER INSTRUCTIONS To restart, turn the thermostat above room temperature. 11.5 Simple Troubleshooting Some possible reasons for the heater not operating are: 1. Gas supply not "ON". 2. Electricity supply not "ON". 3. The time and/or temperature controls are not “ON”. 4. A limit switch may have operated. This may be caused by an interruption of the electrical supply, failure of the distribution fan or vent or heat exchanger blockage.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 12: SERVICING 12.1 Servicing Instructions After start-up, the heater will require maintenance to be carried out annually. If the heater is used in a dirty or dusty area, more frequent maintenance may be necessary. WARNING Cut Hazard Turn off gas and electrical supply before maintenance. Fan can start automatically at any time. Failure to follow these instructions can result in severe injury or product damage.
SECTION 12: SERVICING 12.8 Maintenance Checklist WARNING Explosion Hazard Service and annual inspection must be done by a contractor qualified in the installation and service of gas-fired heating equipment or your gas supplier. Turn off gas and electrical supplies before performing service or maintenance.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Burner Observation Window Make sure it is clean and free of cracks or holes. Combustion Fan Scroll, Wheel and Motor Inshot Burners and Orifices Compressed air or a vacuum cleaner may be used to clean dust and dirt. Direct-Spark Igniter Replace if there are cracked ceramics, excessive carbon residue, or erosion of the electrode. Clean and replace as required. Clear of obstructions (even spider webs will cause problems).
SECTION 13: TROUBLESHOOTING SECTION 13: TROUBLESHOOTING 13.1 General WARNING Explosion Hazard Installation must be done by a registered installer/ contractor qualified in the installation and service of gas-fired heating equipment or your gas supplier. Failure to follow these instructions can result in death, injury or property damage. Start Are gas & electrical supplies on? No Turn on supplies.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 13.2 Troubleshooting For Automatic Ignition Burner Systems WARNING Start Are gas & electrical supplies on? No Turn on supplies. No Turn on controls. Yes Are external controls (i.e. Thermostat) on? Electrical Shock Hazard Do not touch ignition components. Voltage from ignition components is high.
SECTION 13: TROUBLESHOOTING 13.3 Troubleshooting for Flame Supervision System To measure flame current, connect a 0 - 50 μA DC meter in series with the flame probe. If the meter reads negative values, then reverse the test leads. START Connect a DC ammeter in series with the flame probe. Is the flame present and at least 1 µA DC flame current? No Use General Troubleshooting section to trace the fault.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 13.4 Troubleshooting for Gas Valves START Is gas pressure at inlet of the valve correct for gas type? Note pressure found. No Fault elsewhere. Correct pressure problem. No Valve or ignition control faulty. Replace with one of correct type. No Valve faulty. Replace with one of correct type. No If problems persist, contact Roberts-Gordon at www.rg-inc.
SECTION 14: REPLACEMENT PARTS SECTION 14: REPLACEMENT PARTS See warnings and notes on Page 28, Section 12 before removing or replacing parts. Burner Components All serviceable burner parts are accessed by the door on the side of the heater. Remove the sheetmetal screws. 14.1 Gas Valve Remove the gas supply pipe at the heater inlet.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 14.2 Burner Compartment Burner Compartment Cover Viewing Port Flame Probe Ignition Electrode The burner compartment is a sealed compartment. Following any work, re-seal the compartment with the gas pipe rubber seal fully in place and all screws fitted and tight. Remove flexible air duct from spigot. Remove screws and pull off burner cover. 14.2.1 Burner Injectors Manifold Ensure gas tight fitting of injectors.
SECTION 14: REPLACEMENT PARTS 14.3 Ignition Electrode and Flame Probe Inshot Burners Manual Reset Limit Switch (Position may vary.) Flame Probe Flame Probe Limit Switch Ignition Electrode Electrode .120 (3 mm) spark gap Inshot Burners Burner Compartment Front Views To replace the electrode or flame probe, remove the electrical lead and screw. Pull out from mounting. Refit in reverse ensuring that the gap to burner is as shown in the front view of the burner compartment.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 14.4 Combustion Fan Vertical Installation To remove the fan, remove screws securing the fan and mounting plate to the vent box. Intake & Exhaust Covers Mounting Plate to Vent Box fixing screws Gaskets Air Intake Adapter Vent Box Mounting Plate to Flue Fan fixing screws Intake & Exhaust Covers To remove the fan from the mounting plate, remove screws. Refit in reverse order.
SECTION 14: REPLACEMENT PARTS 14.5 Pressure Switch Pull off 3 way connector. Spring open plastic clips of mounting cradle. Replace with correct type of pressure switch for model. The pressure switches are color coded for each pressure setting. WARNING Carbon Monoxide Hazard Use correct pressure switch specified for each model. Use of incorrect pressure switch or disabling pressure switch circuit could cause unsafe condition. Failure to follow these instructions can result in death or serious injury.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 14.6 Ignition Control The control mounts to the heat exchanger plate. Pull out ignition cable and wiring from board, noting their positions. Release the four mounting standoffs. Refit in reverse. Ensure correct location of ignition cable and all other wiring. 14.7 Axial Fan/Guard/Motor Assembly The axial fan unit for the heater is supplied completely assembled and balanced. 14.7.1 Fan Removal and Replacement Remove the mounting hardware.
SECTION 15: SPECIFICATIONS SECTION 15: SPECIFICATIONS 15.1 Low-Profile (Models 30 - 125) UH(A) (AS) Series Dimension Data Model UH [A] [AS] 30 UH [A] [AS] 45 UH [A] [AS] 60 UH [A] [AS] 75 UH [A] [AS] 100 UH [A] [AS] 125 'A' Height in 12 12 17.75 17.75 23 23 'C' Center of Flue [Top Option] in 5.2 5.2 5.2 5.2 6.9 6.9 'D' Center of Flue in 2.5 2.5 2.5 2.5 2.5 2.5 Recommended Mounting Height to Heater Base ft 10 10 12 12 20 20 Top View 17.
COMBAT® UH UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 15.2 General Technical Data Table (All Models) Model UH [A] [AS] UH [A] [AS] UH [A] [AS] UH [A] [AS] UH [A] [AS] UH [A] [AS] 30 45 60 75 100 125 Low Profile UHA Axial Fans Full Load Amps @ 115 V Air Volume A 3.0 3.0 4.1 4.1 5.8 5.8 CFM 691 1376 1376 1902 1902 2245 in (cm) 4 (10) 4 (10) 4 (10) 4 (10) 4 (10) 4 (10) ft (m) 25 (7.6) 25 (7.6) 25 (7.6) 25 (12.2) 40 (12.2) 40 (12.
SECTION 16: THE ROBERTS GORDON® COMBAT® TUBULAR SECTION 16: THE ROBERTS GORDON® COMBAT® TUBULAR UNIT HEATER WARRANTY ROBERTS-GORDON WILL PAY FOR: Within 42 months from date of shipment from RobertsGordon, replacement parts will be provided free of charge for any part of the product which fails due to a manufacturing or material defect. Roberts-Gordon will require the part in question to be returned to the factory.
Attach this information to the wall near the ROBERTS GORDON® heater ® Read the Installation, Operation and Service Manual thoroughly before installation, operation or service. WARNING OPERATING INSTRUCTIONS 1. STOP! Read all safety instructions on this information sheet. 2. Open the manual gas valve in the heater supply line. 3. Turn on electric power to the heater. 4. Set the thermostat to desired setting (above ambient temperature). The automatic starting sequence begins. TO TURN OFF THE HEATER 1.
