Roberts-Gordon 225 250 - Manuals

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 2 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 r...

SECTION 3: C RITICAL C ONSIDERATIONS 3 SECTION 3: CRITICAL CONSIDERATIONS3.1 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 discha...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 4 Figure 1: Installation Clearances and Clearances to Combustibles 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 t...

SECTION 4: N ATIONAL S TANDARDS AND A PPLICABLE C ODES 5 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...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 6 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 handl...

SECTION 6: V ENTING 7 SECTION 6: VENTING6.1 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...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 8 6.2.2 Separated Combustion Heaters (Models UHAS 150 - 40 0) 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 1...

SECTION 6: V ENTING 9 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 u...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 10 Figure 5: Standard Vented Heater - Common Vertical Vent Termination Roof 18" (46 cm) Min. Type "B" vent cap (7" or 8") may be used. (These are not available from Roberts-Gordon.) Roof Flashing Approved Th...

SECTION 6: V ENTING 11 Figure 6: Separated Combustion Heater - Vertical and Horizontal Vent Termination Figure 7: Concentric Vent Box Vent Termination Listed Thimble through Combustible Wall Vent 12" (31 cm) Minimum from wall to vent termination. Air Intake Condensate Trap to Drain (Optional) 12...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 12 Figure 8: Concentric Vertical and Horizontal Vent Termination - Separated Combustion Heater Vent Air Intake* Concentric Vent Box Vertical Option 10' (3 m) Maximum Horizontal Option Concentric Vent Box Vent Combustion Air Ter...

SECTION 7: A IR S UPPLY 13 SECTION 7: AIR SUPPLY7.1 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 axia...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 14 SECTION 8: GAS PIPING It is important that the gas supply pipe and the electrical connections do not support any of the heater’s weight.A gas meter is connected to the service pipe by the gas supply company. An existing mete...

SECTION 9: W IRING 15 SECTION 9: WIRING All heater models require constant 120 V 60 Hz 1Ø power supply. Check heater(s) rating plate for electrical rating for proper circuit sizing. For servicing, a disconnect switch of proper electrical rating should be installed in the vicinity of the heater.All h...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 18 9.5 Electrical Connection to the Heater Note: Junction box is not provided with heater. Conduit can also be attached directly to heater with wire junction made within the heater cabinet. BX Connector Junction Box Flexible Co...

SECTION 10: O PERATION AND M AINTENANCE 19 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...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 20 Figure 10: Automatic Burner Control Sequence Figure 11: Gas Valve for Models UHA[S] 150 - 400 If at any stage the flame fails, the control will retry for ignition. The control has four trials for ignition before a one hour l...

SECTION 10: O PERATION AND M AINTENANCE 21 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. To adjust...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 22 SECTION 11: USER INSTRUCTIONS11.1 User Instructions The UHA[S] Series heaters are fully automatic and operate from the external controls fitted on site. 11.2 Heater Operation When the heater has been switched on by the therm...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 24 SECTION 12: SERVICING12.1 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. NOT...

SECTION 12: S ERVICING 25 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 Rober ts-Gordon and conform to all req...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 26 Burner Observation Window Make sure it is clean and free of cracks or holes. Clean and replace as required. Flue Blower Scroll, Wheel and Motor Compressed air or a vacuum cleaner may be used to clean dust and dirt. Inshot Bu...

SECTION 13: T ROUBLESHOOTING 27 SECTION 13: TROUBLESHOOTING13.1 General Ens u re proper air flo w clearance for axial fan. Open lo uv ers slightly. Replace axial fan if it does not operate. If pro b lems persist, contact Ro b erts-Gordon LLC at www .rg-inc.com Heater Operating TROUBLESHOOT ENDS. N o...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 28 13.2 Troubleshooting For Automatic Ignition Burner Systems If pro b lems persist, contact Ro b erts-Gordon LLC at www .rg-inc.com Heater Operating TROUBLESHOOT ENDS. N o Trace fa u lt in s u per v ision system. See Tro ub le...

SECTION 13: T ROUBLESHOOTING 29 13.3 Troubleshooting for Flame Supervision System NOTE: Minimum flame probe current 1 μ A DC. Typical flame probe current 3-5 μ A DC. Repair or replace as necessary. If pro b lems persist, contact Ro b erts-Gordon LLC at www .rg-inc.com Replace ignition control. Use G...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 30 13.4 Troubleshooting for Gas Valves 13.5 Troubleshooting for Flue Blower V al v e fa u lty. Replace w ith one of correct type. Fa u lt else w here. Correct press u re pro b lem. If pro b lems persist, contact Ro b erts-Gordo...

SECTION 14: R EPLACEMENT P ARTS 31 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 th...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 32 14.2 Burner Compartment 14.2.1 Burner Injectors Remove flexible air duct from spigot Remove access plate Remove screws and pull off burner cover Viewing port for flame probe Viewing port for ignition electrode Flame probe Bu...

SECTION 14: R EPLACEMENT P ARTS 33 14.3 Ignition Electrode and Flame Probe Description Part Number Qty. Spark Electrode 90427411 1 Automatic Ignition Flame Probe 90439300 1 Transformer 90436900K 1 Ignition Module 90434008 1 Inshot Burners UHA[S] 150 92000001 7 Inshot Burners UHA[S] 175 92000001 8 In...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 34 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. 14.5 Louvers and Louver Spring The louvers for standar...

SECTION 14: R EPLACEMENT P ARTS 35 14.6 Flue Blower IT IS IMPORTANT THAT ONLY THE CORRECT FLUE BLOWER SPECIFIED FOR EACH MODEL TYPE IS USED WHEN REPLACING THESE ITEMS. Carry out a start-up after working on or changing an flue blower. See Page 22, Section 11 . MODEL UHA[S] 150 - 175 UHA[S] 200 - 300 ...

COMBAT ® UHA U NIT H EATER I NSTALLATION O PERATION AND S ERVICE M ANUAL 36 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. Carry out ...

SECTION 14: R EPLACEMENT P ARTS 37 14.9.1 Fan Removal and Replacement 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. • Strictly comply with the color code of t...

SECTION 16: T HE ROBERTS GORDON ® COMBAT ® UHA-S ERIES W ARRANTY 41 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 par...

10' (3 m) WARNING © 2007 Roberts-Gordon, LLC www.rg-inc.com Printed in U.S.A. P/N 91040031 Rev B Attach this information to the wall near the ROBERTS GORDON ® heater Read the Installation, Operation and Service Manual thoroughly before installation, operation or service. OPERATING INSTRUCTIONS 1. ST...