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 ................................................. 6 Figure 3: Vent and Roof Detail .................................................. 9 Figure 4: Standard Vented Heater - Vertical and Horizontal Vent Termination................................ 9 Figure 5: Standard Vented Heater - Common Vertical Vent Termination ...........................
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® UHA 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 UHA[S] 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.
COMBAT® UHA 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 name plate 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 NFPA 54/ANSI Z223.1 latest revision, National Fuel Gas Code. Canada: Refer to CSA B149.1 Natural Gas and Propane Installation Code. 4.
COMBAT® UHA 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 Suspension WARNING Crush Hazard Use 3/8" threaded rod minimum.
SECTION 6: VENTING SECTION 6: VENTING 6.1 Venting This heater must be vented in accordance with the rules contained in this manual and with the following national codes and any state, provincial or local codes which may apply: United States: Refer to NFPA 54/ANSI Z223.1 - latest revision, National Fuel Gas Code; Canada: Refer to CSA B149.1 Natural Gas and Propane Installation Code. Any portion of vent pipe passing through a combustible wall must have a listed thimble to conform with the above codes.
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 6.2.2 Separated Combustion Heaters (Models UHAS 150 - 400) 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 12, Figure 8. As an option, the vent and air intake are run as separate pipes to a concentric vent box and a concentric vent/air intake pipe penetrates the wall or roof. 6.
SECTION 6: VENTING Figure 3: Vent and Roof Detail 6.7 Vent Material Vent material may be single wall 26 ga. (minimum) galvanized steel or equal thickness stainless steel. Completely seal all joints, refer to Page 7, Section 6.2. If penetrating a combustible wall or roof, a listed thimble with 2" (5 cm) clearance must be used. 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.
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 5: Standard Vented Heater - Common Vertical Vent Termination Type "B" vent cap (7" or 8") may be used. (These are not available from Roberts-Gordon.) Type "B" Vent Pipe SIDE VIEW Roof Flashing 18" (46 cm) Min. Roof The last section of vent pipe passing through the roof or wall may be Type "B" vent pipe. All other vent materials in the building must be single wall vent pipe.
SECTION 6: VENTING Figure 6: Separated Combustion Heater - Vertical and Horizontal Vent Termination 12" (31 cm) Minimum from air inlet to vent termination (may be horizontal or vertical clearance). Air Intake* Vent Vertical Option 90° Bend Horizontal Option Air Intake 12" (31 cm) Minimum from air inlet to vent termination (may be horizontal or vertical clearance).
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 8: Concentric Vertical and Horizontal Vent Termination - Separated Combustion Heater Vent Terminal with Baffle Plate 4" Type B-1 Vent UHA 150-250: 6" Dia. Single Wall UHA 300-400: 8" Dia. Single Wall Storm Collar (By Others) (Attach with 3 sheet metal screws.
SECTION 7: AIR SUPPLY SECTION 7: AIR SUPPLY 7.1 Separated Combustion Installation When installed as a separated combustion heater (UHAS), 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.
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 8: GAS PIPING WARNING Fire Hazard Hazard Fire Connect to to Figure 9. 9. 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.
SECTION 9: WIRING SECTION 9: WIRING WARNING Electrical Shock Hazard Disconnect electrical power and gas supply before servicing. This appliance must be connected to a properly grounded electrical source. Failure to follow these instructions can result in death or electrical shock. All heater models require constant 120 V 60 Hz 1Ø power supply. Check heater(s) rating plate for electrical rating for proper circuit sizing.
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 9.
SECTION 9: WIRING 9.4 UHA[S] Series Ladder Wiring Diagram NOTE: For field wiring into service junction box, or if any of the original wire supplied with the heater must be replaced, it must be replaced with wiring material having a temperature rating of at least 105°C and 600 volts. For supply connections use No. 14 AWG or larger wires.
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 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.
SECTION 10: OPERATION AND MAINTENANCE SECTION 10: OPERATION AND MAINTENANCE 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.
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Figure 10: Automatic Burner Control Sequence If at any stage the flame fails, the control will retry for ignition. The control has four trials for ignition before a one hour lockout.
SECTION 10: OPERATION AND MAINTENANCE 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.
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 11: USER INSTRUCTIONS 11.1 User Instructions The UHA[S] Series heaters are fully automatic and operate from the external controls fitted on site. WARNING 11.4 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.
SECTION 11: USER INSTRUCTIONS 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.
COMBAT® UHA 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 Installation Code and Annual Inspections: All installations and service of ROBERTS GORDON® equipment must be performed by a contractor qualified in the installation and service equipment sold and supplied by Roberts-Gordon and conform to all requirements set forth in the ROBERTS GORDON® manuals and all applicable governmental authorities pertaining to the Explosion Hazard installation, service and operation of the equipment.
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL Burner Observation Window Make sure it is clean and free of cracks or holes. Clean and replace as required. Flue Blower Scroll, Wheel Compressed air or a vacuum cleaner may be used to clean dust and dirt. and Motor Inshot Burners and Clear of obstructions (even spider webs will cause problems). Orifices Carefully remove any dust and debris from the burner.
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® UHA 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® UHA 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 LLC at www.rg-inc.
SECTION 14: REPLACEMENT PARTS SECTION 14: REPLACEMENT PARTS See warnings and notes on Page 24, 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. NOTE: Flexible duct only applies for models UHAS.
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 14.2 Burner Compartment 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. Burner compartment cover Flame probe Viewing port for flame probe Remove flexible air duct from spigot Ignition electrode NOTE: Flexible duct only applies for models UHAS.
SECTION 14: REPLACEMENT PARTS 14.3 Ignition Electrode and Flame Probe 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® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 14.4 Heat Exchanger The standard heat exchanger assembly is compossed of multiple tubular heat exchangers in models UHA[S]150 - UHA[S]400, there is a four pass exchange.
SECTION 14: REPLACEMENT PARTS 14.6 Flue Blower Remove screws securing outlet flange to the flue adapter. Rear Panel Hole Flue Adapter to Flue Blower screws Refit in reverse order. Vent Box Vent Box screws Outlet Gasket Flue Adapter Flue Blower Disconnect electrical connections at plug in tabs. Mounting Plate Remove screws securing flue blower mounting plate to vent box.
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 14.7 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.
SECTION 14: REPLACEMENT PARTS 14.9.1 Fan Removal and Replacement Remove the mounting hardware. Remove the screws and washers. Description Axial Fan UHA[S] 150 - 175 Axial Fan UHA[S] 200 - 250 Axial Fan UHA[S] 300 - 400 Part Number 90710416 90710417 90710416 Qty. 1 1 2 14.9.2 To Replace the Fan Assembly • To replace the fan assembly, reverse the procedure shown above. • Check that the fan blades are free to rotate before turning on the power to the fan.
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL SECTION 15: SPECIFICATIONS 15.
SECTION 15: SPECIFICATIONS 15.2 General Technical Data Table (All Models) Model UHA[S] 150 Full Load Amps @ 115 V UHA[S] UHA[S] 175 200 UHA[S] 225 UHA[S] 250 UHA[S] 300 UHA[S] UHA[S] 350 400 A 5.8 5.8 10.6 10.6 10.6 11.6 11.6 11.
COMBAT® UHA UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL 40
SECTION 16: THE ROBERTS GORDON® COMBAT® UHA-SERIES WARRANTY SECTION 16: THE ROBERTS GORDON® COMBAT® UHA-SERIES WARRANTY ROBERTS-GORDON WILL PAY FOR: Within 24 months from date of purchase by buyer or 27 months from date of shipment by Roberts-Gordon (whichever comes first), 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.
